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Stupid ostringstream question
by Bill Lear 30 Jul '07

30 Jul '07

I have been searching the world in vain for a stringstream that works with a static buffer, and does not use the heap for memory allocation. We have an application that uses lots (12-16Gb) of memory. This puts a strain on the memory allocation routines, and when we want to create a small string we find that stringstream is very, very expensive, and sprintf into a static buffer much, much faster. Does boost provide anything like this? This actually came up when we realized that boost lexical_cast was using stringstream. When we replaced it with sprintf, our runtimes (when memory usage was very high) went down significantly. I should also point out that ANYTHING we did with dynamic memory at that point in the application (vector::push_back, for example) was hideously slow. I'd like to have the best of both worlds: the relatively clear syntax of the ostringstream inserters, working on a static buffer. Any help (code samples especially) appreciated. Bill

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[Boost.Build v2] Please help updating my build process from v1 (1.33.1) to v2 (1.34.1)
by Ames, Andreas (Andreas) 30 Jul '07

30 Jul '07

Hi all, as most of my colleagues insist on using Visual Studio, I have made a vcproj-wrapper around Boost.Build v1 for 1.33.1. The Jamfile looks like this: <Jamfile> project-root ; BOOST_LOCAL_STAGE_DIR ?= stage ; rule Pseudo ( target : libname : kind : variant : name_prefix ? ) { LIBNAME = $(libname) ; LIBKIND = $(kind) ; VARIANT = $(variant) ; REALNAME = $(name_prefix)$(LIBNAME) ; REALNAME ?= $(LIBNAME) ; NOTFILE $(target) ; DEPENDS $(target) : $(BOOST_LOCAL_STAGE_DIR)/$(LIBKIND)/$(LIBNAME)/$(VARIANT) ; stage $(BOOST_LOCAL_STAGE_DIR)/$(LIBKIND)/$(LIBNAME)/$(VARIANT) : <$(LIBKIND)>@boost/libs/$(LIBNAME)/build/boost_$(REALNAME) : <sysinclude>../../../boost <debug-symbols>on <debug-store>database <runtime-build>$(VARIANT) <runtime-link>dynamic <native-wchar_t>on : $(VARIANT) ; } Pseudo signals_lib_debug : signals : lib : debug ; Pseudo signals_lib_release : signals : lib : release ; </Jamfile> Furthermore I've created a Jamrules and a boost-build.jam like follows: <Jamrules> project boost : ../../../boost ; </Jamrules> <boost-build.jam> boost-build ../../../boost/tools/build/v1 ; </boost-build.jam> From my vcproj-files I can then just invoke bjam with the appropriate target and TOOLS-spec. 1) Unfortunately this doesn't work any longer with Boost.Build v2. After changing boost-build.jam in the obvious way, I just get bjam to display: error: Could not find parent for project at '.' error: Did not find Jamfile or project-root.jam in any parent directory. although the Jamfile is definitely there. The same thing happens, when I change the name to Jamfile.v2. 2) Skimming over the docs, I don't see Jamrules (which was previously needed) mentioned. Is it still necessary? 3) Finally, the build wrapper needs to be selfcontained (we get it from our repository), so site-config.jam and user-config.jam must not be mandatory. I just wonder, where to specify my 'using' rule(s) (like 'using msvc : 8.0 ;'). TIA, aa -- Andreas Ames | Programmer | Comergo GmbH | ames AT avaya DOT com Sitz der Gesellschaft: Stuttgart Registergericht: Amtsgericht Stuttgart - HRB 22107 Geschäftsführer: Andreas von Meyer zu Knonow, Udo Bühler, Thomas Kreikemeier

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[filesystem] Using path in shared library fault (?)
by Hughes, James 30 Jul '07

30 Jul '07

Hello all, I am using filesystem::path is a shared library called 'common', to initialise a static var. static boost::filesystem::path p("/home/me"); However, this give a seg fault (Linux, gcc) when the shared library is loaded. I am guessing this is an issue with the filesytem library not being loaded in at the time of the loading of 'common' (when the static var is initialised) - hence the seg fault. Its only an issue with the static variable, as all other uses of path in the library work fine. Is there any way round this? James This message (including any attachments) contains confidential and/or proprietary information intended only for the addressee. Any unauthorized disclosure, copying, distribution or reliance on the contents of this information is strictly prohibited and may constitute a violation of law. If you are not the intended recipient, please notify the sender immediately by responding to this e-mail, and delete the message from your system. If you have any questions about this e-mail please notify the sender immediately.

1 0

stream + file_descriptor_source + closing
by Tomasz Noiński 30 Jul '07

30 Jul '07

Hi, I'm trying to use boost::iostreams for a project I'm writing and I have a problem: It seems that the destructor of boost::iostreams::stream<boost::iostreams::file_descriptor_source> closes the file descriptor. I really need to be able to close this file descriptor manually and I can't find any way to do it. Note that file_descriptor_source has a constructor parameter specifying if the descriptor should be closed in file_descriptor_source destructor or not. It perfectly works - it's boost::iostreams::stream destructor that forces closing the description, not file_descriptor_source destructor. A short code illustrating this problem (for Linux): --- 8< --- #include <iostream> #include <boost/iostreams/device/file_descriptor.hpp> #include <boost/iostreams/stream.hpp> #include <cstring> #include <sys/types.h> #include <sys/stat.h> #include <fcntl.h> #include <errno.h> using namespace std; using namespace boost::iostreams; int main() { int fd = open("/etc/fstab", O_RDONLY); clog << "fd=" << fd << endl; { file_descriptor_source source(fd, false); stream<file_descriptor_source> strm(source); string s; strm >> s; clog << "first line: " << s << endl; } int closeRet = close(fd); int closeErrno = errno; clog << "closing result: " << closeRet << ", " << strerror(closeErrno) << endl; } --- 8< --- The behaviour I would expect is the close() at the end succeeding. However, it returns -1 with errno=EBADF. Is this the expected behaviour or a bug? TIA, Noix

1 0

boost thread read_write_mutex
by Fei Liu 30 Jul '07

30 Jul '07

Just a question, I don't see any big bold note that the related read/write mutex or locks should not be used...What's the story of reader/writer's mutex in boost::thread? Fei

2 1

[Boost.Graph] Compiler warning in dijkstra_shortest_paths
by Ewgenij Sokolovski 30 Jul '07

30 Jul '07

Hello. I use the Boost.Graph with the dijkstra_shortest_paths algorithm in my graph application. All works fine. But while compiling with the options -Wall -W I get a strange compiler warning: /usr/include/boost/graph/dijkstra_shortest_paths.hpp:80: Warning: »bfs_vis$m_decreased« is used in this function uninitialised This was the last line of the warning because it is quite long in its complete version. I translated the line above from German because I use a German version of g++, so maybe it sounds in the English version a little bit different. But the meaning remains the same:) Does anybody know what that is supposed to mean? Is something wrong with my program or is it a bug in dijkstra_shortest_paths? Here is the warning in the complete version: /usr/include/boost/graph/dijkstra_shortest_paths.hpp: In function »void boost::detail::dijkstra_dispatch2(const VertexListGraph&, typename boost::graph_traits<G>::vertex_descriptor, DistanceMap, WeightMap, IndexMap, const Params&, ColorMap) [with VertexListGraph = boost::adjacency_list<boost::vecS, boost::vecS, boost::undirectedS, boost::no_property, float, boost::no_property, boost::listS>, DistanceMap = float*, WeightMap = boost::adj_list_edge_property_map<boost::undirected_tag, float, float&, long unsigned int, boost::property<boost::edge_bundle_t, float, boost::no_property>, boost::edge_bundle_t>, IndexMap = boost::vec_adj_list_vertex_id_map<boost::no_property, long unsigned int>, Params = boost::bgl_named_params<boost::adj_list_edge_property_map<boost::undirected_tag, float, float&, long unsigned int, boost::property<boost::edge_bundle_t, float, boost::no_property>, boost::edge_bundle_t>, boost::edge_weight_t, boost::bgl_named_params<float*, boost::vertex_distance_t, boost::no_property> >, ColorMap = boost::iterator_property_map<__gnu_cxx::__normal_iterator<boost::default_color_type*, std::vector<boost::default_color_type, std::allocator<boost::default_color_type> > >, boost::vec_adj_list_vertex_id_map<boost::no_property, long unsigned int>, boost::default_color_type, boost::default_color_type&>]«: /usr/include/boost/graph/dijkstra_shortest_paths.hpp:80: Warning: »bfs_vis$m_decreased« is used in this function uninitialised Greetings Ewgenij -- Ist Ihr Browser Vista-kompatibel? Jetzt die neuesten Browser-Versionen downloaden: http://www.gmx.net/de/go/browser

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Problem Bjam
by question boost 30 Jul '07

30 Jul '07

Hi, using Code Blocks i got the folowing message: ld.exe "Cannot find -lboost_filesystem-mgw-mt-s-l_33_l". So I did :cd /jam source location/then build.bat Then, i put the following variables: path=C:\Program Files\CodeBlocks\bin BOOST_BUILD_PATH=C:\Documents and Settings\Administrateur\Bureau\boost_1_33_1\boost_1_33_1\tools\build\v2 BOOST_ROOT=C:\Documents and Settings\src\boost It is not the right things to do => i get the message again. My question is: What are the right things to do in order not to get the message any more? Thank You _________________________________________________________________ Windows Live Messenger vous offre 30 nouvelles émoticônes gratuites, installées directement dans votre Messenger ! http://www.emoticones-messenger.fr/

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How to build only Boost.Iostreams with compression filter support on Windows XP using MinGW
by Benjamin Lau 30 Jul '07

30 Jul '07

Good evening, Pardon my ignorance, or my poor documentation reading skills, but I am unable to build Boost.Iostreams with compression filter support on Windows XP using MinGW. I am using Boost 1.34.1, zlib 1.2.3 and bzip2 1.0.4. I tried the following command lines but to no avail: bjam --toolset=gcc -sNO_COMPRESSION=0 -sNO_BZIP2=0 -sBZIP2_LIBPATH=C:\bzip2-1.0.4 -sBZIP2_SOURCE=C:\bzip2-1.0.4 -sNO_ZLIB=0 -sZLIB_LIBPATH=C:\zlib-1.2.3 -sZLIB_SOURCE=C:\zlib-1.2.3 stage or bjam --toolset=gcc --NO_COMPRESSION=0 --NO_BZIP2=0 --BZIP2_LIBPATH=C:\bzip2-1.0.4 --BZIP2_SOURCE=C:\bzip2-1.0.4 --NO_ZLIB=0 --ZLIB_LIBPATH=C:\zlib-1.2.3 --ZLIB_SOURCE=C:\zlib-1.2.3 stage I searched through the Boost.Iostreams documentation, the Boost.Jam documentation, and the Boost.Build V2 documentation. Boost.Jam documentation indicates that the former should work, but Boost.Build V2 seems to use very little of or not at all of the -s flag for Boost.Jam, so I tried the latter. The result of both commands were the same, Boost.Iostreams was built without the compression filters. However, I do get 12 "warning: Unable to construct ./stage-unversioned" as the first output from Boost.Jam, after which it says "...patience..." and continues with the building process. Thank you in advance for assisting me in my problem, and in case I have missed out something critical yet obvious, and hence resulting in my failure, I apologise for not reading carefully enough. Thank you and have a nice day Benjamin Lau

2 2

Zhang has Tagged you :)
by Zhang Shenpeng 29 Jul '07

29 Jul '07

2 1

[asio] when deadline_timer::cancel() returns
by Yuval Ronen 29 Jul '07

29 Jul '07

The Asio docs for deadline_timer::cancel say that "This function forces the completion of any pending asynchronous wait operations against the timer". Let's say I have a thread executing io_service::run, and is now invoking a completion handler of a deadline_timer. While this completion handler is underway, a second thread is calling cancel() on that deadline_timer. Is the cancel() call supposed to block until the completion handler is finished? To my best understanding, both according to the docs, and according to what seems to be logical to me, the answer is "yes, it should block". However, it doesn't. Is it a bug, or by design? Yuval

1 1

[mpl] what is not a placeholder expression
by "JOAQUIN LOPEZ MU?Z" 29 Jul '07

29 Jul '07

According to the MPL reference, a placeholder expression X<a1,..,an> must satisfy (among others) the following condition: "All of X's template parameters, including the default ones, are types." According to that the following should then compile without errors: #include <boost/mpl/apply.hpp> #include <boost/mpl/assert.hpp> #include <boost/type_traits/is_same.hpp> using namespace boost; using namespace boost::mpl; template<typename T,int=0> struct foo { template<typename Q> struct apply{ typedef Q type; }; }; typedef apply1<foo<_1>,int>::type t1; BOOST_MPL_ASSERT((is_same<t1,int>)); int main(){} However, I've tried with GCC 3.4.4 and the static assertion fails! I'd like to know: 1. Whether I'm right in assuming that the code above should compile without assertion failures. 2. What the behavior is for other versions of GCC and compilers: reports most welcome!! 3. Whether this is a known problem specific to GCC or, more generally, what the status of this issue is. Thank you, Joaquín M López Muñoz Telefónica, Investigación y Desarrollo

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Trac / Register User
by Olaf van der Spek 28 Jul '07

28 Jul '07

On 7/27/07, Chris Weed <chrisweed(a)gmail.com> wrote: > > Where are the links to Trac from http://boost.org/? > > I've been trying to find Trac before but didn't succeed. > > Report Bugs -> Bug tracking facility > > http://svn.boost.org/trac/boost/report Thanks. But where is the register user link? I only see login.

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[BGL] Parameter: CompareFunction - dijkstra_shortest_paths
by Leandro T. C. Melo 28 Jul '07

28 Jul '07

Hello all. It is clear for me the reason for template parameter CombineFunction in dijkstra_shortest_paths. For instance, prim_minimum_spanning_tree makes use of it to correct compute the MST. Basically, in Dijkstra's it is something like this: distance = distance of vertex v + weight of edge e; And in Prim's only the weight is considered: distance = weight of edge e; This is reflected on the argument used for the CombineFunction in Prim's function (from file prim_minimum_spanning_tree.hpp): prim_minimum_spanning_tree(...) { typedef typename property_traits<WeightMap>::value_type W; std::less<W> compare; detail::_project2nd<W,W> combine; dijkstra_shortest_paths(...); } Where _project2nd is: template <class U, class V> struct _project2nd { V operator()(U, V v) const { return v; } }; However, it is not clear the reason of the CompareFunction template parameter (which is a predicate). First, because, I don't see a situation where not using std::less<Some_type> would make any sence, because of the way the Dijkstra's algorithm is constructed. Second, because the value_type of the DistanceMap must be the same of the value_type of WeightMap (according to the documentation). Therefore, why the following two lines of code in Prim's implementation (from the function I pointed at beginning of the email)? typedef typename property_traits<WeightMap>::value_type W; std::less<W> compare; Since, in Dijkstra's algorithm the only difference is that DistanceMap is used as an argument for the definition of the value_type from property_traits. Am I loosing something here? If yes, would anyone explain it to me? Thank you, Leandro.

1 0

[parameter] Parameter-Enabled Class Templates: combining keyword and deduction for the same parameter
by Joaquín Mª López Muñoz 28 Jul '07

28 Jul '07

The docs explain that a parameter can be named: typedef parameter::parameters< required<tag::threading_policy> ... > class_signature; ... class_<threading_policy<single_threaded>,...>; or else be deduced: typedef parameter::parameters< required< deduced<tag::threading_policy>, is_base_and_derived<threading_policy_marker,_> > ... > class_signature; ... class multithreaded: threading_policy_marker{...}; class_<multithreaded,...>; Now, is it possible to combine these two options into one, so that the the two syntaxes class_<threading_policy<single_threaded>,...>; class_<multithreaded,...>; are accepted? If so, how? Thank you, Joaquín M López Muñoz Telefónica, Investigación y Desarrollo

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Program Options: parse_config_file: How to ignore unknown options?
by Olaf van der Spek 28 Jul '07

28 Jul '07

Hi, How do I tell this function to ignore unknown options?

2 1

Boost Threads and Cancel Method
by Jeffery Cavallaro 27 Jul '07

27 Jul '07

Per the C++0x discussions earlier in the week, and the calls for the Bjarne, et al to make some definitive decisions regarding a threading API, I would ask the Boost thread developers not to wait and please add a cancel method now. A lot of the scheduling priority stuff can wait, but it is going to be real hard to turn people from pthreads until some sort of a cancel method, however basic, is available. I believe that this is the state of things; however, it not, someone please feel free to correct me. Jeffery Cavallaro Postini Engineering 650-486-8342 ----------------------------------------------------------- This message may contain confidential and/or privileged information. This information is intended to be read only by the individual or entity to whom it is addressed. If you are not the intended recipient, you are on notice that any review, disclosure, copying, distribution or use of the contents of this message is strictly prohibited. If you have received this message in error, please notify the sender immediately and delete or destroy any copy of this message.

1 0

program_options: documentation dead end
by Steven Mackenzie 27 Jul '07

27 Jul '07

I am trying to understand composing, multitoken and zero_tokens methods of the typed_value class. This link http://www.boost.org/doc/html/boost/program_options/typed_value.html#id6986… is to the composing method from the reference page for the typed_value class: it suggests looking at the is_composing documentation, which is unfortunately empty. Can this be fixed for Boost 1.34.1? Also, can someone explain to me what the multitokens method does. The doc states "Specifies that the value can span multiple tokens." What is the definition of a token here? Finally, what does zero_tokens() do? Thanks in advance Steven

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[Important] Boost moving to Subversion on Tuesday, July 31st
by Doug Gregor 27 Jul '07

27 Jul '07

============================================= Boost will be moving to Subversion on Tuesday, July 31st. ============================================= === What's happening === We are converting the existing Boost CVS repository, hosted by SourceForge, over to Subversion. The contents of the CVS repository will join the Boost sandbox and (beta) web site in the Boost Subversion repository, hosted by the Open Systems Laboratory at Indiana University. === Timeline === At 8:00 AM EDT on Tuesday, July 31, we will be cutting off access to the current Boost CVS repository. The Boost Subversion repository, mailing list archives, Boost Trac, beta.boost.org, and anything else hosted at OSL will also be unavailable during this time. We expect to have everything back online by midnight Tuesday. I will send another note to the mailing lists when the conversion is complete. The mailing lists and the main Boost web site should still work during this time. === What you should do === If you have any outstanding changes to Boost in your local CVS tree, commit them before 8:00am EDT on Tuesday. Any changes to your local CVS tree that have not been committed to CVS will be lost and will have to manually be moved over Subversion. The Boost CVS repository will not be reopened. If you have not done so yet, familiarize yourself with Subversion, read the Boost Trac page about the Boost Subversion repository, and, if you have write access to CVS, request a Subversion account: http://svn.boost.org/trac/boost/wiki/BoostSubversion === Who's in charge? === I will be the primary contact person for questions about and problems with the Boost Subversion repository. Most questions should be directed to the Boost mailing list. Account requests should go to all of the moderators at boost-owner(a)lists.boost.org. === How you can help === In several Boost tools and many places in Boost's documentation, we refer to the Boost CVS repository. We need help upgrading these tools and fixing the documentation to refer to the Boost Subversion repository. Specifically: * regression.py, used by regression testers, must be updated to use Subversion * Various developer and release-manager documentation talks about Boost's CVS, but should now refer to Subversion. Better yet: migrate this documentation over to the Boost Trac, where it is easier to maintain and update, and won't be a part of the Boost distribution * Write Subversion-specific documentation on the Trac. Quick-start guides, tips and tricks, etc. would be helpful. One particularly important bit: using svnmerge.py to simplify the handling of release branches. Doug Gregor Open Systems Lab @ Indiana University

1 0

portable lock-free reference counting
by Bryan Green 27 Jul '07

27 Jul '07

Hello, I have a class that contains a reference count. I would like to maintain the count without using a mutex. Can anyone recommend a way to do this portably, using Boost? I see the needed mechanics in 'detail/sp_counted_base.hpp', but since it's in 'detail', I'm not sure what the most portable (and maintainable) way to use it is. Thanks, -Bryan

1 0

boost 1.34.1 cygwin build error.
by chun ping wang 27 Jul '07

27 Jul '07

I change user-config.jam to add "using python : : /usr/bin/python2.5 ;" $ ./bjam --toolset=gcc --prefix=/usr/boost-install install Building Boost.Regex with the optional Unicode/ICU support disabled. Please refer to the Boost.Regex documentation for more information (don't panic: this is a strictly optional feature). /usr/src/boost_1_34_1/tools/build/v2/tools/stage.jam:424: in object(installed-sh ared-lib-generator)(a)4.run *** argument error * rule virtual-target.register ( target ) * called with: ( object(file-target)@1396 object(file-target)@1397 ) * extra argument object(file-target)@1397 /usr/src/boost_1_34_1/tools/build/v2/build/virtual-target.jam:880:see definition of rule 'register' being called /usr/src/boost_1_34_1/tools/build/v2/build/generators.jam:840: in try-one-genera tor-really /usr/src/boost_1_34_1/tools/build/v2/build/generators.jam:902: in try-one-genera tor /usr/src/boost_1_34_1/tools/build/v2/build/generators.jam:1110: in construct-rea lly /usr/src/boost_1_34_1/tools/build/v2/build/generators.jam:1186: in generators.co nstruct /usr/src/boost_1_34_1/tools/build/v2/tools/stage.jam:160: in construct /usr/src/boost_1_34_1/tools/build/v2/build/targets.jam:1242: in object(install-t arget-class)(a)85.generate /usr/src/boost_1_34_1/tools/build/v2/build/targets.jam:765: in generate-really /usr/src/boost_1_34_1/tools/build/v2/build/targets.jam:738: in object(main-targe t)(a)246.generate /usr/src/boost_1_34_1/tools/build/v2/build/targets.jam:895: in targets.generate- from-reference /usr/src/boost_1_34_1/tools/build/v2/build/targets.jam:1169: in generate-depende ncies /usr/src/boost_1_34_1/tools/build/v2/build/targets.jam:1214: in object(alias-tar get-class)(a)89.generate /usr/src/boost_1_34_1/tools/build/v2/build/targets.jam:765: in generate-really /usr/src/boost_1_34_1/tools/build/v2/build/targets.jam:738: in object(main-targe t)(a)248.generate /usr/src/boost_1_34_1/tools/build/v2/build/targets.jam:895: in targets.generate- from-reference /usr/src/boost_1_34_1/tools/build/v2/build/targets.jam:1169: in generate-depende ncies /usr/src/boost_1_34_1/tools/build/v2/build/targets.jam:1214: in object(alias-tar get-class)(a)97.generate /usr/src/boost_1_34_1/tools/build/v2/build/targets.jam:765: in generate-really /usr/src/boost_1_34_1/tools/build/v2/build/targets.jam:738: in object(main-targe t)(a)252.generate /usr/src/boost_1_34_1/tools/build/v2/build-system.jam:402: in load /usr/src/boost_1_34_1/tools/build/v2/kernel/modules.jam:261: in import /usr/src/boost_1_34_1/tools/build/v2/kernel/bootstrap.jam:132: in boost-build /usr/src/boost_1_34_1/boost-build.jam:9: in module scope

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Creating an equivalent to java's System.currentTimeMillis
by Philippe Mondon 27 Jul '07

27 Jul '07

Hi, I'm trying to build an equivalent to java's System.currentTimeMillis() using boost framework, and I've done something like that : #include <boost/date_time/posix_time/posix_time.hpp> using namespace boost::gregorian; using namespace boost::posix_time; //.... Other code long Utils::getCurrentTime() { ptime now(microsec_clock::universal_time()); date d(1970,boost::date_time::Jan,01); ptime torigin(d); //midnight //time_duration tduration = now - torigin; time_period tperiod(torigin,now); //long returnVal = tduration.total_milliseconds(); long returnVal = tperiod.length().total_milliseconds(); cout << "Current time : " << returnVal << endl; return returnVal; } Unfortunately, it gives only a 8 digit number (in java you've got a 13 digit number when using currentTimeMillis) so I suspect that it does not give a duration since Jan the 1st 1970 (which is java reference). Do you have an idea of how to achieve the writing of this piece of code? Thanks, regards. Philippe Mondon Equipe PAC/Architecture DIMC Calyon Ce message et ses pièces jointes (le "message") est destiné à l'usage exclusif de son destinataire. Si vous recevez ce message par erreur, merci d'en aviser immédiatement l'expéditeur et de le détruire ensuite. Le présent message pouvant être altéré à notre insu, CALYON Crédit Agricole CIB ne peut pas être engagé par son contenu. Tous droits réservés. This message and/or any attachments (the "message") is intended for the sole use of its addressee. If you are not the addressee, please immediately notify the sender and then destroy the message. As this message and/or any attachments may have been altered without our knowledge, its content is not legally binding on CALYON Crédit Agricole CIB. All rights reserved.

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[interprocess] Problems on Mac OS X 10.4
by Mark A. Thalman 27 Jul '07

27 Jul '07

We are using the boost interprocess library for some cross-platform interprocess communication. It seems to be working fine on Windows but we are having some issues on the Mac OS (10.4.10, using gcc 4). One thing is that the remove call always deletes the shared memory file, regardless of whether the other process is using it. Does anyone know if this has been tested? Also, the only version I can find is in CVS. Is this where I should be getting the source from, or is there an "official" release somewhere? -- Mark

1 0

[statechart] completion event
by Francisco Santos 27 Jul '07

27 Jul '07

Dear Mr. Andreas Huber, Are completion transitions and events supported by the Statechart Boost library? If so, how do you recommend they should be implemented in code. I have not found examples of statemachines containing transitions *without* explicit triggers in your library's doc page (http://www.boost.org/libs/statechart/doc/index.html) Thank you, Francisco Santos PS: I have included the definition of a completion transition and completion event for reference: A completion transition is a transition without an explicit trigger, although it may have a guard defined. When all transition and entry actions and activities in the currently active state are completed, a completion event instance is generated. This event is the implicit trigger for a completion transition. The completion event is dispatched before any other queued events and has no associated parameters. For instance, a completion transition emanating from a concurrent composite state will be taken automatically as soon as all the concurrent regions have reached their final state. If multiple completion transitions are defined for a state, then they should have mutually exclusive guard conditions. [1] "Completion transitions and completion events", p. 144, Unified Modeling Language Specification, v1.4.2, 2004

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[tests] Signals not well covered in unit tests (in contrast to exceptions)?
by Jens Seidel 27 Jul '07

27 Jul '07

Hi, I have the following problem with a C++ project on Linux using the Boost.test framework: I use the "resource acquisition is initialization" technique to ensure that all resources I allocate are properly released. That's why I have helper classes with a resource allocation in the constructor and deallocation in the destructor. One example of such a helper class is an indentation for my logging code: LOG("blabla"); { LogIndendation indent; // start indentation of output LOG("a message"); divide_by_zero(); LOG("a further message"); } // reset indentation LOG("blabla"); The output is normally: blabla a message a further message blabla Please note that divide_by_zero (which perform an integer division by zero) causes a SIGFPE fatal arithmetic error and the signal handler of Boost.test detects this. Nevertheless the destructor of LogIndendation is *not* called and all further tests I have create wrong indented output (which I compare with the expected output as another test too). So I get: test1 blabla a message unknown location(0): fatal error in "Test1": signal: SIGFPE (arithmetic exception) test2 blabla If I do not generate a signal but throw an exception instead, the destructor is called so this is fine. (Please note that g++ does normally not call a destructor with such a technique if the exception is not catched at all (probably because all resources are expected to be cleaned up, once the process terminates???), but Boost.test catchs all exceptions - good.) I also tried to write my own SIGFPE signal handler which just throws an exception. But this handler is not called, probably it's overwritten by Boost's one. Probably Boost doesn't call the previous handler because it normally terminates the application. But maybe it's possible for Boost to save the initial handler in main() and later to compare the current handler with the initial one. If they are equal handle signals as usual (output an error) otherwise do nothing and call the previous handler? Has anyone a good solution for me, or is there a problem with Boost.test and signals? How to solve this? Jens

1 0

boost 1.34.1 build.bat
by chun ping wang 27 Jul '07

27 Jul '07

For some reason i can no longer specify the toolset to use ...when i run build.bat mingw on my windows machine.. it defaults to msvc. Inside user-config.jam I have using mingw : : C://Dev-Cpp//bin//gcc ; but it keeps using msvc build.

3 3

Any update on a form of boost::threads getting into the C++ 0x standard?
by Graham Reitz 26 Jul '07

26 Jul '07

Our group has had a lot of success with boost::threads and grown comfortable with its use. Thanks, Graham

8 11

Boost with XCode 2.4.1
by Scott Froberg 26 Jul '07

26 Jul '07

Hi All, I'm very new around here. Is anyone using Boost with Apple's XCode 2.4.1? I'm having some trouble with adding the libraries correctly. Thanks, Scott ____________________________________________________________________________________ Get the free Yahoo! toolbar and rest assured with the added security of spyware protection. http://new.toolbar.yahoo.com/toolbar/features/norton/index.php

5 4

[Lambda] Trouble using istreambuf_iterators
by Scott Meyers 26 Jul '07

26 Jul '07

The following code using Lambda with vector iterators compiles without complaint: vector<char> v; find_if(v.begin(), v.end(), _1 == 'x'); Ditto for this code, which uses istream_iterators: istream_iterator<char> b1(cin); istream_iterator<char> e1; find_if(b1, e1, _1 == 'x'); But the same code with istreambuf_iterators gets rejected: istreambuf_iterator<char> b2(cin); istreambuf_iterator<char> e2; find_if(b2, e2, _1 == 'x'); Error messages from VC8 and gcc 4.1.1 are below. Am I doing something wrong, is there a bug in Lambda regarding istreambuf_iterators, or is this a restriction that I didn't see documented somewhere? Thanks, Scott VC8 says: lambda.cpp D:\Apps\Microsoft Visual Studio 8\VC\INCLUDE\algorithm(87) : error C2664: 'bool boost::lambda::lambda_functor<T>::operator ()<char>( A &) const' : cannot convert parameter 1 from 'char' to 'char &' [Instantiation traceback omitted] gcc 4.1.1. says: stl_algo.h:188: error: no match for call to '( boost::lambda::lambda_functor< boost::lambda::lambda_functor_base< boost::lambda::relational_action<boost::lambda::equal_action> , boost::tuples::tuple< boost::lambda::lambda_functor< boost::lambda::placeholder<1> >, const char > > > ) (char)' stl_algo.h: In function 'istreambuf_iterator<char, char_traits<char> > __find_if( istreambuf_iterator<char, char_traits<char> > , istreambuf_iterator<char, char_traits<char> > , boost::lambda::lambda_functor< boost::lambda::lambda_functor_base< boost::lambda::relational_action<boost::lambda::equal_action> , boost::tuples::tuple< boost::lambda::lambda_functor< boost::lambda::placeholder<1> >, const char > > >, input_iterator_tag )': [Instantiation traceback omitted]

4 11

Tuple use/overuse?
by Graham Reitz 26 Jul '07

26 Jul '07

I have been finding that the boost::tuple library is so convenient that I am concerned I may be overusing it. For example, in situations where I might use a struct I am tend to prefer a tuple. Where is a good place to draw the line in situations like this? Or is this the intent to use it as often as possible? Thanks much, Graham

6 14

[mpl] BOOST_MPL_AUX_LAMBDA_SUPPORT for classes without nested ::type
by Joaquín Mª López Muñoz 26 Jul '07

26 Jul '07

Hello, The following program does compile fine on a conformant compiler: #include <boost/mpl/apply.hpp> #include <boost/mpl/aux_/lambda_support.hpp> #include <boost/mpl/assert.hpp> #include <boost/type_traits/is_same.hpp> using namespace boost; using namespace boost::mpl; template<typename T> struct foo { BOOST_MPL_AUX_LAMBDA_SUPPORT(1,foo,(T)) }; template<typename T> struct bar { typedef T type; BOOST_MPL_AUX_LAMBDA_SUPPORT(1,bar,(T)) }; typedef apply1<foo<_1>,int>::type t1; typedef apply1<bar<_1>,int>::type t2; BOOST_MPL_ASSERT((is_same<t1,foo<int> >)); BOOST_MPL_ASSERT((is_same<t2,int>)); int main(){return 0;} Note that foo<_1> applied to int resolves to foo<int> whereas bar<_1> resolves to int, which is correct because the former class does not have a nested ::type while the latter does. This is documented in the MPL reference at: http://www.boost.org/libs/mpl/doc/refmanual/quote.html Now, if I compile the same program with a defective compiler (MSVC 6.0) not supporting PTS, I've got the following: ...\boost\boost\mpl\aux_\preprocessed\msvc60\apply_wrap.hpp(77) : error C2039: 'type' : is not a member of 'result_<int>' ...\boost\mpl\aux_\preprocessed\msvc60\bind.hpp(184) : see reference to class template instantiation 'boost::mpl::apply_wrap1<class foo_rebind,int>' being compiled whereas the code associated with bar<> works OK. So, it seems like BOOST_MPL_AUX_LAMBDA_SUPPORT does not provide lambda support for classes without nested ::type: 1. Is this so by design and/or documented somewhere? 2. If not, could it be fixed? Thank you, Joaquín M López Muñoz Telefónica, Investigación y Desarrollo

2 1

Compile probelms
by alex＠gorex.com.hk 26 Jul '07

26 Jul '07

Hi, I need help on compile Boost.Python. I keep having an error "cannot open file boost_python-vc80-mt-gd-1_34.lib" when I issue a commond bjam -sTOOLS=vc-8_0. I searched some notes from web and I added "import python" or "using python" already. However the problem still exists. anyone can advise?

2 1

Re: [Boost-users] [thread] comparison with Intel Threading BuildingBlocks
by Ovanes Markarian 26 Jul '07

26 Jul '07

On Wed, July 25, 2007 15:54, Andrew Holden wrote: > Toon Knapen wrote: >> I just received (again) some doc on the Intel Threading >> Building Blocks >> (TBB) (http://www.threadingbuildingblocks.org/) >> >> I was wondering how the boost.thread developers/supporters >> would compare TBB with boost.thread (btw: the book of James >> Reinders on TBB mentions boost.thread) ? > > The two libraries are meant to solve different problems. Boost.thread > handles situations where the programmer wishes to explicitly manage > threads, often giving each thread a distinct task to perform. It would > be useful for situations like worker threads in a GUI program. It is > also useful I/O-bound threads, which would cause TBB to waste a > processor core. > > TBB, on the other hand, is useful for situations in which you have a > parallelizable task to perform, and you would rather not worry about > threading details, like a parallel for loop. Do you mean that TBB is more like a "future" which might be added to the upcoming tr2? >[...] With Kind Regards, Ovanes Markarian

3 2

program_options error class
by ALiX 26 Jul '07

26 Jul '07

In the latest implementation of boost (1.34), the error class in boost::program_options is defined as a subclass of std::logic_error. This is, however, not stated in the documentation. In the documentation the class error is described as if it has no superclass from which it inherits. In my programs, can I safely rely on the fact that error inherits from std::logic_error, and so comfortably use the what() function to extract the error messages? Might this change in later implementations? Kind regards, /ALiX

2 3

Fixed sized containers
by Dowie, Martin (SELEX) (UK) 26 Jul '07

26 Jul '07

All, I've noticed the addition of template class "array" to TR1. As I work in the embedded field this is going to be extrememly useful to me (thank you!). I was wondering if there were any plans to expand on this and standardize other statically fixed containers? Cheers -- Martin SELEX Sensors and Airborne Systems Limited Registered Office: Sigma House, Christopher Martin Road, Basildon, Essex SS14 3EL A company registered in England & Wales. Company no. 02426132 ******************************************************************** This email and any attachments are confidential to the intended recipient and may also be privileged. If you are not the intended recipient please delete it from your system and notify the sender. You should not copy it or use it for any purpose nor disclose or distribute its contents to any other person. ********************************************************************

1 0

[statechart] asynchronous machine's post event question.
by Jiang Miao 26 Jul '07

26 Jul '07

Hi, According to the code struct Working:sc::state< Working, Active > { Working(my_context ctx):my_base(ctx) { cout<<__FUNCTION__<<endl; outermost_context_type& machine=outermost_context(); // machine is a asynchronous machine. A machine.post_event( EvtTerminate() ); B machine.my_scheduler().queue_event( machine.my_handle(),boost::intrusive_ptr<EvtTerminate>(new EvtTerminate() ) ); }; ~Working(void) { cout<<__FUNCTION__<<endl; } typedef sc::transition< EvtIdleWork,Idle > reactions; }; Is there any difference between A and B? Which is the better and recommended or Is there another better way to post event? Thank you.

2 1

Re: [Boost-users] Support for sp_counted_base for HP Itanium aCC compiler
by Baruch Zilber 26 Jul '07

26 Jul '07

>Hi Baruch, > >thank you for doing this. > >Can you, please, post your code here (I guess, it is a header file like >sp_counted_base_gcc_ia64.hpp)?. It will be reviewed by the Boost community >and we'll review it at HP. And, then, it can be added to Boost, hopefully, >in Boost 1.35 time frame. > >Thanks again, > Boris I copy the file sp_counted_base_gcc_ia64.hpp to sp_counted_base_acc_ia64.hpp and change the following methods: atomic_increment(),atomic_decrement() and atomic_conditional_increment() The change was: #include <machine/sys/inline.h> inline void atomic_increment( int * pw ) { _Asm_mf(); static_cast<int>(_Asm_fetchadd(_FASZ_W, _SEM_REL, (void*)pw, +1, _LDHINT_NONE) + 1); } inline int atomic_decrement( int * pw ) { _Asm_mf(); return (static_cast<int>(_Asm_fetchadd(_FASZ_W, _SEM_REL, (void*)pw, -1, _LDHINT_NONE) - 1) - 1); } inline int atomic_conditional_increment( int * pw ) { return _Asm_mov_to_ar((_Asm_app_reg)_AREG_CCV, *pw, (_Asm_fence)(_UP_CALL_FENCE | _UP_SYS_FENCE | _DOWN_CALL_FENCE | _DOWN_SYS_FENCE)), _Asm_mf(), (_Asm_cmpxchg((_Asm_sz)4, (_Asm_sem)_SEM_REL, pw, *pw + 1, (_Asm_ldhint)_LDHINT_NONE)); } Thanks Baruch This message and the information contained herein is proprietary and confidential and subject to the Amdocs policy statement, you may review at http://www.amdocs.com/email_disclaimer.asp

2 4

Re: [Boost-users] Tuple use/overuse?
by Roman Perepelitsa 26 Jul '07

26 Jul '07

> Joel de Guzman <joel(a)boost-consulting.com> on Thu, 26 Jul 2007 06:59:46 +0800 > > - bind expression with tuple becomes a nightmare > > Why? Ah access to the members? It's a nightmare indeed. I'd say boost::get is not bindable at all. typedef tuple<int, double> two; vector<two> src; vector<int> dst; // ouch const int & (*get_first)(const cons<two::head_type, two::tail_type> &) = get<0>; transform(src.begin(), src.end(), dst.begin(), get_first); Would not it be cool to write something like this instead? transform(src.begin(), src.end(), dst.begin(), get<0>()); And it's not hard to implement it. namespace boost { namespace tuples { template <int N> struct getter { template <class HT, class TT> typename access_traits< typename element<N, cons<HT, TT> >::type >::non_const_type operator()(cons<HT, TT> & c) const { return get<N>(c); } template <class HT, class TT> typename access_traits< typename element<N, cons<HT, TT> >::type >::const_type operator()(const cons<HT, TT> & c) const { return get<N>(c); } }; } template <int N> tuples::getter<N> get() { return tuples::getter<N>(); } } Does fusion have something like this? Regards, Roman Perepelitsa Deutsche Bank Moscow +7 (495) 660-74-08 --- This e-mail may contain confidential and/or privileged information. If you are not the intended recipient (or have received this e-mail in error) please notify the sender immediately and delete this e-mail. Any unauthorized copying, disclosure or distribution of the material in this e-mail is strictly forbidden. Please refer to http://www.db.com/en/content/eu_disclosures.htm for additional EU corporate and regulatory disclosures.

1 0

Re: [Boost-users] [thread] comparison with Intel Threading BuildingBlocks
by Ovanes Markarian 26 Jul '07

26 Jul '07

On Wed, July 25, 2007 17:06, Andrew Holden wrote: > Ovanes Markarian wrote: >> Thanks for you link, a very interesting one ;) I ment this >> one in my previous post: >> http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2276.html > > Another interesting technology. I'll need to examine it more closely. > It looks similar to TBB. Intel's implementation of TBB uses tasks and > thread pools. Instead of futures, it uses canned parallel algorithms > that WILL complete before returning, thus freeing the user from worrying > that values might not be ready. > > It looks like the futures run at a somewhat lower level than TBB, which > is certainly not a bad thing. I can already see the beginnings of some > ideas where it might do things that TBB can't, like any situation where > you wish to launch a separate thread (or task) and forget about it. I'm > also intrigued by the option of waiting an a specific return value from > the thread instead of joining the entire thread, like in boost.thread. > > I find myself wordering if this would be a worthy addition to > boost.thread. It looks like you could use a boost.thread condition > object in the implementation of a future. AFAIK Peter Dimov did some technology evaluation and implementation for futures. I also saw that Howard Hinnant was working on futures. May be there are already some implemenations which prove the concept. Boost Vault contains them at: http://boost-consulting.com/vault/index.php?&direction=0&order=&directory=C… With Kind Regards, Ovanes Markarian

6 5

astar using namespace
by bringiton bringiton 26 Jul '07

26 Jul '07

I've removed the using namespace boost from the astar graph cities example. (I prefer to define namespaces explicitly). //using namespace boost; I've added boost:: to all the type names and it all compiles fine. However, some functions compile without the namespace. ie the following line: WeightMap weightmap = get(boost::edge_weight, g); Can someone please explain why I dont need a boost:: infront of the get?

4 3

[iostreams] missing stream_facade
by Cheng Lian 26 Jul '07

26 Jul '07

Hi, all I was playing around with iostreams recently, and I found that some examples of iostreams include the header file: boost/iostreams/stream_facade.hpp But I cannot find this header any where. I noticed that in the 1.34 release, iostreams is entirely outdated, and I waited until 1.34.1, but this mysterious header is still missing. I apologize if the file just stands right there but somehow I managed to miss it. Also, I think there should be a Jamfile to compile and test the examples. The documentation is pretty useful but well organized and offers many code snippet but never a compilable example as a whole. Fortunately the test cases offered many useful use cases :-) Cheers Cheng

1 0

[serialisation]Portable Binary Archives
by Hughes, James 25 Jul '07

25 Jul '07

Hello all, Probably answered before, but I wondered whether there is a standard implementation for portable binary archives available. I have found a reference here (http://programmicon.com/2007/03/07/the-un-fun-stuff/) I noticed some recent posts on the subject, but haven't found out much info googling. Cheers James This message (including any attachments) contains confidential and/or proprietary information intended only for the addressee. Any unauthorized disclosure, copying, distribution or reliance on the contents of this information is strictly prohibited and may constitute a violation of law. If you are not the intended recipient, please notify the sender immediately by responding to this e-mail, and delete the message from your system. If you have any questions about this e-mail please notify the sender immediately.

7 21

[regex] 1.34.1 vc71.mak problem
by Kyle Alons 25 Jul '07

25 Jul '07

The .mak file produces -1_34.lib files, but linking w/ regex expects -1_34_1.lib files. -- --------------------- Kyle Alons http://www.kinook.com

2 1

Re: [Boost-users] [thread] comparison with Intel Threading BuildingBlocks
by Ovanes Markarian 25 Jul '07

25 Jul '07

On Wed, July 25, 2007 16:15, Andrew Holden wrote: > Ovanes Markarian wrote: >> >> Do you mean that TBB is more like a "future" which might be >> added to the upcoming tr2? > > It's possible. According to TBB's FAQ, Intel is working with the C++ > standards group towards this goal. The FAQ entry can be found at > http://softwarecommunity.intel.com/tbbWiki/FAQ/647.htm. The proposal > can be found at > http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n2104.pdf. Thanks for you link, a very interesting one ;) I ment this one in my previous post: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2276.html With Kind Regards, Ovanes Markarian

2 1

[thread] comparison with Intel Threading Building Blocks
by Toon Knapen 25 Jul '07

25 Jul '07

I just received (again) some doc on the Intel Threading Building Blocks (TBB) (http://www.threadingbuildingblocks.org/) I was wondering how the boost.thread developers/supporters would compare TBB with boost.thread (btw: the book of James Reinders on TBB mentions boost.thread) ? thanks in advance, t

2 1

Intel 9.1 compile errors
by Dilian Kupenov 25 Jul '07

25 Jul '07

Hi, I'm relativly new user of Boost and up to this point I haven't any problems. Building and using the library with MSVC 8 hasn't cause any problems to me. Now I'm trying to compile Boost 1.34.1 with the Intel 9.1 compiler but I'm getting very strange compilation errors. I'm using the latest version of the bjam and I have set the toolset like this: using intel-win : 9.1 : "C:/Program Files/Intel/Compiler/C++/9.1/IA32/Bin/icl.exe" ; Usually most of the files in evry sublibrary compile but 2-3 fail. For example: compile-c-c++ bin.v2\libs\test\build\intel-win-9.1\debug\threading-multi\exception_safety.obj Intel(R) C++ Compiler for 32-bit applications, Version 9.1 Build 20060706Z Package ID: W_CC_C_9.1.028 Copyright (C) 1985-2006 Intel Corporation. All rights reserved. icl -Qvc8 "-Qlocation,link,C:\Program Files\Microsoft Visual Studio 8\VC\bin" libs\test\src\exception_safety.cpp -Fobin. v2\libs\test\build\intel-win-9.1\debug\threading-multi\exception_safety.obj -TP /Z7 /Od /Ob0 /W3 /GR /MDd /Zc:forScope / Zc:wchar_t /GB /Op /Qwn5 /Qwd985 -Qoption,c,--arg_dep_lookup /Zc:forScope /Qansi_alias /Zc:wchar_t -D_NATIVE_WCHAR_T_DEF INED -Qoption,cpp,--arg_dep_lookup /wd4675 /EHs -c -DBOOST_ALL_NO_LIB=1 -DBOOST_TEST_DYN_LINK=1 -I. exception_safety.cpp .\boost/test/impl/exception_safety.ipp(453): error: namespace "std" has no member "isprint" if( std::isprint( c ) ) ^ detected during instantiation of "void boost::itest::<unnamed>::format_execution_path(boost::wrap_stringstream &, ExecPathIt, ExecPathIt, unsigned int) [with ExecPathIt=boost::itest::execution_path_point *]" compilation aborted for libs\test\src\exception_safety.cpp (code 2) call "C:/Program Files/Intel/Compiler/C++/9.1/IA32/Bin//iclvars.bat" > nul icl @"bin.v2\libs\test\build\intel-win-9.1\debug\threading-multi\exception_safety.obj.rsp" ...failed compile-c-c++ bin.v2\libs\test\build\intel-win-9.1\debug\threading-multi\exception_safety.obj... I'll be very thankful for any suggestions and comments. Regards Dido ----------------------------------------------------------------- С бензин в кръвта! http://auto-motor-und-sport.bg/

1 0

[asio] best strategy for creating lots of timers
by Yuval Ronen 25 Jul '07

25 Jul '07

Hi. I'm writing an application that uses many timers in many places. I'd like to use asio::deadline_timer for this purpose, and an asio::deadline_timer requires an instance of asio::io_service to function. The easy way to do it is to create an asio::io_service along side with each instance of deadline_timer. However, I fear that this is may be wasteful in terms of OS resources. So my first question is whether this is true. If that's true, then I'm not creating an io_service for each deadline_timer, so I must be sharing a single io_service by several timers. The problem with such a solution is that the io_service doesn't know about the timers using it, and especially, it doesn't know how many such timer there are at any given point in time, and if there are any. If the number of timers is zero, then there is no work to be done by the io_service, and the thread calling io_service::run() will be released. This is bad, because when a new timer will be created, it will require that there will be a thread calling io_service::run(). So what's the best solution? One possible way is to accompany each io_service with a dummy deadline_timer that will never expire (expires_from_now(infinity)). This will cause the io_service to not release its thread, until that dummy timer is cancel()ed. Another way is to wrap the call to io_service::run() with a loop that checks a whether it should call run() or wait until some new timer is added (using a boost::condition). There might be other options in addition to these two. What do you think? Yuval

2 2

Compile error using boost::variant
by Eric.Zuur＠shell.com 25 Jul '07

25 Jul '07

Hello, We have the following problem with compiling a piece of code using the Intel 9.1 compiler. The compiler can map the constructor of type_v2 on more than one overloaded constructor of the boost::variant, while in our opinion it should not even concider to use the one that first creates a temporary object (see compiler output). The VC7.1 compiler and the GCC compiler both compile this code correctly. Can someone help us out with this problem? Or does someone has a workaround for this? This is a simplified version of the code: #include <boost/variant.hpp> int main(int argc, char**argv) { typedef boost::variant<int, double> type_v1; typedef boost::variant<char, int, type_v1*> type_v2; type_v1 var1( 10 ); type_v2 var2( &var1 ); return 0; } This is the compiler output: D:\3rdParty\boost\boost/variant/variant.hpp(1342): (col. 9)error: more than one instance of overloaded function "boost::variant<T0_, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19>::convert_construct [with T0_=char, T1=int, T2=boost::variant<int, double, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_> *, T3=boost::detail::variant::void_, T4=boost::detail::variant::void_, T5=boost::detail::variant::void_, T6=boost::detail::variant::void_, T7=boost::detail::variant::void_, T8=boost::detail::variant::void_, T9=boost::detail::variant::void_, T10=boost::detail::variant::void_, T11=boost::detail::variant::void_, T12=boost::detail::variant::void_, T13=boost::detail::variant::void_, T14=boost::detail::variant::void_, T15=boost::detail::variant::void_, T16=boost::detail::variant::void_, T17=boost::detail::variant::void_, T18=boost::detail::variant::void_, T19=boost::detail::variant::void_]" matches the argument list: function template "void boost::variant<T0_, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19>::convert_construct(T &, int, boost::mpl::false_) [with T0_=char, T1=int, T2=boost::variant<int, double, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::varian t::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_> *, T3=boost::detail::variant::void_, T4=boost::detail::variant::void_, T5=boost::detail::variant::void_, T6=boost::detail::variant::void_, T7=boost::detail::variant::void_, T8=boost::detail::variant::void_, T9=boost::detail::variant::void_, T10=boost::detail::variant::void_, T11=boost::detail::variant::void_, T12=boost::detail::variant::void_, T13=boost::detail::variant::void_, T14=boost::detail::variant::void_, T15=boost::detail::variant::void_, T16=boost::detail::variant::void_, T17=boost::detail::variant::void_, T18=boost::detail::variant::void_, T19=boost::detail::variant::void_]" function template "void boost::variant<T0_, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19>::convert_construct(const boost::variant<U0, U1, U2, U3, U4, U5, U6, U7, U8, U9, U10, U11, U12, U13, U14, U15, U16, U17, U18, U19> &, long) [with T0_=char, T1=int, T2=boost::variant<int, double, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_> *, T3=boost::detail::variant::void_, T4=boost::detail::variant::void_, T5=boost::detail::variant::void_, T6=boost::detail::variant::void_, T7=boost::detail::variant::void_, T8=boost::detail::variant::void_, T9=boost::detail::variant::void_, T10=boost::detail::variant::void_, T11=boost::detail::variant::void_, T12=boost::detail::varia t::void_, T13=boost::detail::variant::void_, T14=boost::detail::variant::void_, T15=boost::detail::variant::void_, T16=boost::detail::variant::void_, T17=boost::detail::variant::void_, T18=boost::detail::variant::void_, T19=boost::detail::variant::void_]" argument types are: (boost::variant<int, double, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_> *const, long) detected during instantiation of "boost::variant<T0_, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19>::variant(const T &) [with T0_=char, T1=int, T2=boost::variant<int, double, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_> *, T3=boost::detail::variant::void_, T4=boost::detail::variant::void_, T5=boost::detail::variant::void_, T6=boost::detail::variant::void_, T7=boost::detail::variant::void_, T8=boost::detail::variant::void_, T9=boost::detail::variant::void_, T10=boost::detail::variant::void_, T11=boost::detail::variant::void_, T12=boost::detail::variant::void_, T13=boost::detail::variant::vo id_, T14=boost::detail::variant::void_, T15=boost::detail::variant::void_, T16=boost::detail::variant::void_, T17=boost::detail::variant::void_, T18=boost::detail::variant::void_, T19=boost::detail::variant::void_, T=boost::variant<int, double, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_> *]" make[1]: *** [obj/Win32_x86_INTEL_Debug/Calculator.obj] Error 2 Regards, Eric Zuur Shell International Exploration and Production B.V. Volmerlaan 8, Postbus 60, 2280 AB Rijswijk, The Netherlands

1 0

Boost 1.34.1 Released
by Thomas Witt 25 Jul '07

25 Jul '07

http://www.boost.org Boost 1.34.1, the latest version of peer-reviewed, portable C++ libraries, has been released. This is a bug fix release addressing many problems with the 1.34.0 release. It is a recommended upgrade for all users of Boost 1.34.0. For a complete list of fixes see the Boost Trac at: http://svn.boost.org/trac/boost/query?status=closed&milestone=Boost +1.34.1 Supported Compilers: New in this release is improved support for the IBM XL C/C++ compiler. Boost is tested on a wide range of compilers and platforms. Since Boost libraries rely on modern C++ features not available in all compilers, not all Boost libraries will work with every compiler. The following compilers and platforms have been extensively tested with Boost, although many other compilers and platforms will work as well. For more information, see the regression test results. * Apple GCC 4.0.1 on Mac OS X. * Borland C++ 5.8.2 on Windows. * GNU C++ o 3.2.x., 3.3.x, 3.4.x, 4.0.x, 4.1.x on Linux o 4.1.x on Solaris o 3.4.x on Windows * HP C++ for Tru64 UNIX 7.1. * HP aC++ A.06.14. * Intel C++ 9.1 on Windows, 9.0 on Linux. * Metrowerks CodeWarrior 9.4 on Windows. * Microsoft Visual C++ 6.0 (sp5, with and without STLport), 7.0, 7.1, 8.0. Note: Boost does not support the non-standard "Safe" C++ Library shipping with Visual C++ 8.0, which may result in many spurious warnings from Boost headers and other standards-conforming C++ code. To suppress these warnings, define the macro _SCL_SECURE_NO_DEPRECATE. * Sun Studio 11 on Solaris. Acknowledgements Thomas Witt managed this release. A great number of people contributed their time and expertise to make this release possible. Special thanks go to Kim Barrett consolidating Boost.Iostreams changes from various branches and Rene Rivera for general build and installation support. -- Thomas Witt witt(a)acm.org

1 0

Sopport for sp_counted_base for HP Itanium aCC compiler
by Baruch Zilber 24 Jul '07

24 Jul '07

Hi, I saw in the official release (1.34.0) that there are couple of implementation for sp_counted_base file according to the compiler and CPU. I notice that there is no implementation for Itanium CPU with aCC compiler. Does someone working of this issue? I implemented a version for this target that use Itanium CPU instruction and I wonder how I can add this to boost Thanks Baruch Zilber This message and the information contained herein is proprietary and confidential and subject to the Amdocs policy statement, you may review at http://www.amdocs.com/email_disclaimer.asp

2 1

[boost][program options] Reading an INI file
by Baranowski, Daniel 24 Jul '07

24 Jul '07

Hello All! Is it possible to parse an INI file with the program options without specifying what is in the INI file first (using options_descriptions)? I already use the program_options library to handle command line and config file based options, but what I'm looking for now is a more traditional ini file interaction. By that I mean where you simply read in the ini file and then can access the category/entry value with something like: INIFile iniFile("MyINIFile.ini"); int myInt = iniFile["Category"]["EntryName"].get<int>(3); // 3 is the default if entry not found In my case, these are options that the user does not need to know about and can only be specified through the configuration file. Therefore, much of the data that is in the options_description is redundant. I've been looking around, and it seems that the parse_config_file() is the standard function to call to parse an INI file, however, that takes an options_description object as the second parameter. I did see in boost/program_options/detail/config_file.hpp where it talks about being able to read standard ini files and how the sections and entries are accessed. Unfortunately, that's buried in the "details" and I don't see any part of the public interface that would allow me to access the ini file. I did read a little about the property_tree library, but that is only available in CVS and I would prefer to stick with one library to handle the program's configuration. Similarly, I have seen plenty of other config libraries out there, but I would prefer to stick with program_options if it can do the job. Thanks for any help! Regards, Daniel ********************************************************************************************** Disclaimer - This email and any files transmitted with it are proprietary and may contain privileged or copyright information. You must not present this message to another party without gaining permission from the sender. If you are not the intended recipient you must not copy, distribute or use this email or the information contained in it for any purpose other than to notify us. If you have received this message in error, please notify the sender immediately, and delete this email from your system. We do not guarantee that this material is free from viruses or any other defects although due care has been taken to minimize the risk. eSafe scanned this email for viruses, vandals and malicious contentAny views expressed in this message are those of the individual sender, except where the sender specifically states them to be the views of LSI. **********************************************************************************************

1 0

[serialization] Possible problem using BOOST_CLASS_IMPLEMENTATION and BOOST_CLASS_TRACKING inside another namespace
by Hughes, James 24 Jul '07

24 Jul '07

Hello all, I have tried to use these macros inside my own namespace, but get a raft load of errors, all seemingly to do with being in the wrong namespace. Moving the macros outside my namespace and all works fine (took a while to figure out!). Is this a known issue? Should it be mentioned in the docs if that just the way it has to work. James This message (including any attachments) contains confidential and/or proprietary information intended only for the addressee. Any unauthorized disclosure, copying, distribution or reliance on the contents of this information is strictly prohibited and may constitute a violation of law. If you are not the intended recipient, please notify the sender immediately by responding to this e-mail, and delete the message from your system. If you have any questions about this e-mail please notify the sender immediately.

1 0

[serialization] Is it possible to change the name of pair output in XML
by Hughes, James 24 Jul '07

24 Jul '07

Hi all, I am serialising a map<pair<MyKey,MyValue> > and in the XML is names the sections 'first' and 'second'. Is it possible to tell serialisation to save a particular pair type such that, in the preceding semi-example, it using my text (i.e. "MyKey" and "MyValue") instead of "first" and "second"? James This message (including any attachments) contains confidential and/or proprietary information intended only for the addressee. Any unauthorized disclosure, copying, distribution or reliance on the contents of this information is strictly prohibited and may constitute a violation of law. If you are not the intended recipient, please notify the sender immediately by responding to this e-mail, and delete the message from your system. If you have any questions about this e-mail please notify the sender immediately.

1 0

unable to find a functional version of interprocess
by Robert Schulz 24 Jul '07

24 Jul '07

Hi! I fail to use any yet tried example of the interprocess here comes a log trying to compile doc_vectorstream.cpp from the HEAD revision of the cvs ( fetched using cvs -z3 -d:pserver:anonymous@boost.cvs.sourceforge.net:/cvsroot/boost co -P boost/ ) there seem to miss a Type 'create_only' !? the definition of the former enum boost::interprocess::detail::create_enum_t ha vanished in cvs from 1.7 to 1.8 in detail/utilities.hpp ? This header is not listed in the documentation on http://igaztanaga.drivehq.com/interprocess/index.html :( Can i somewhere get a working snapshot of the headers? I missed tagging in the boost cvs? Many thanks for any help!!! Robert robert@sandra-laptop:~/opt$ g++ --version g++ (GCC) 4.1.2 (Ubuntu 4.1.2-0ubuntu4) **** Build of configuration Debug for project shmem **** make LANG=C all Building file: ../atest/doc_vectorstream.cpp Invoking: GCC C++ Compiler g++ -I"/home/robert/opt/boost/boost" -O0 -g3 -Wall -c -fmessage-length=0 -MMD -MP -MF"atest/doc_vectorstream.d" -MT"atest/doc_vectorstream.d" -o"atest/doc_vectorstream.o" "../atest/doc_vectorstream.cpp" In file included from /home/robert/opt/boost/boost/boost/interprocess/managed_shared_memory.hpp:21, from ../atest/doc_vectorstream.cpp:16: /home/robert/opt/boost/boost/boost/interprocess/detail/managed_memory_impl.hpp:25:48: warning: boost/interprocess/creation_tags.hpp: No such file or directory /home/robert/opt/boost/boost/boost/interprocess/detail/managed_memory_impl.hpp:691: error: 'boost::interprocess::detail::create_enum_t' has not been declared /home/robert/opt/boost/boost/boost/interprocess/detail/managed_memory_impl.hpp:708: error: 'create_enum_t' in namespace 'boost::interprocess::detail' does not name a type /home/robert/opt/boost/boost/boost/interprocess/detail/managed_memory_impl.hpp: In constructor 'boost::interprocess::detail::create_open_func<BasicManagedMemoryImpl>::create_open_func(BasicManagedMemoryImpl*, int)': /home/robert/opt/boost/boost/boost/interprocess/detail/managed_memory_impl.hpp:692: error: class 'boost::interprocess::detail::create_open_func<BasicManagedMemoryImpl>' does not have any field named 'm_type' /home/robert/opt/boost/boost/boost/interprocess/detail/managed_memory_impl.hpp: In member function 'bool boost::interprocess::detail::create_open_func<BasicManagedMemoryImpl>::operator()(void*, size_t, bool) const': /home/robert/opt/boost/boost/boost/interprocess/detail/managed_memory_impl.hpp:696: error: 'm_type' was not declared in this scope /home/robert/opt/boost/boost/boost/interprocess/detail/managed_memory_impl.hpp:696: error: 'DoOpen' is not a member of 'boost::interprocess::detail' /home/robert/opt/boost/boost/boost/interprocess/detail/managed_memory_impl.hpp:697: error: 'DoCreate' is not a member of 'boost::interprocess::detail' /home/robert/opt/boost/boost/boost/interprocess/detail/managed_open_or_create_impl.hpp: At global scope: /home/robert/opt/boost/boost/boost/interprocess/detail/managed_open_or_create_impl.hpp:55: error: expected `)' before ',' token /home/robert/opt/boost/boost/boost/interprocess/detail/managed_open_or_create_impl.hpp:70: error: expected `)' before ',' token /home/robert/opt/boost/boost/boost/interprocess/detail/managed_open_or_create_impl.hpp:85: error: expected `)' before ',' token /home/robert/opt/boost/boost/boost/interprocess/detail/managed_open_or_create_impl.hpp:101: error: expected `)' before ',' token /home/robert/opt/boost/boost/boost/interprocess/detail/managed_open_or_create_impl.hpp:118: error: expected `)' before ',' token /home/robert/opt/boost/boost/boost/interprocess/detail/managed_open_or_create_impl.hpp:134: error: expected `)' before ',' token /home/robert/opt/boost/boost/boost/interprocess/detail/managed_open_or_create_impl.hpp:261: error: 'create_enum_t' is not a member of 'boost::interprocess::detail' /home/robert/opt/boost/boost/boost/interprocess/detail/managed_open_or_create_impl.hpp:261: error: expected primary-expression before 'size' /home/robert/opt/boost/boost/boost/interprocess/detail/managed_open_or_create_impl.hpp:262: error: expected primary-expression before 'mode' /home/robert/opt/boost/boost/boost/interprocess/detail/managed_open_or_create_impl.hpp:262: error: expected primary-expression before 'const' /home/robert/opt/boost/boost/boost/interprocess/detail/managed_open_or_create_impl.hpp:263: error: expected primary-expression before 'construct_func' /home/robert/opt/boost/boost/boost/interprocess/detail/managed_open_or_create_impl.hpp:263: error: variable or field 'priv_open_or_create' declared void /home/robert/opt/boost/boost/boost/interprocess/detail/managed_open_or_create_impl.hpp:263: error: ISO C++ forbids initialization of member 'priv_open_or_create' /home/robert/opt/boost/boost/boost/interprocess/detail/managed_open_or_create_impl.hpp:263: error: making 'priv_open_or_create' static /home/robert/opt/boost/boost/boost/interprocess/detail/managed_open_or_create_impl.hpp:263: error: ISO C++ forbids in-class initialization of non-const static member 'priv_open_or_create' /home/robert/opt/boost/boost/boost/interprocess/detail/managed_open_or_create_impl.hpp:263: error: 'priv_open_or_create' declared as an 'inline' field /home/robert/opt/boost/boost/boost/interprocess/detail/managed_open_or_create_impl.hpp:263: error: template declaration of 'int boost::interprocess::detail::priv_open_or_create' /home/robert/opt/boost/boost/boost/interprocess/detail/managed_open_or_create_impl.hpp: In static member function 'static void boost::interprocess::detail::managed_open_or_create_impl<DeviceAbstraction, FileBased>::create_device(DeviceAbstraction&, const char*, size_t, boost::interprocess::detail::false_)': /home/robert/opt/boost/boost/boost/interprocess/detail/managed_open_or_create_impl.hpp:248: error: 'create_only' was not declared in this scope /home/robert/opt/boost/boost/boost/interprocess/detail/managed_open_or_create_impl.hpp: In static member function 'static void boost::interprocess::detail::managed_open_or_create_impl<DeviceAbstraction, FileBased>::create_device(DeviceAbstraction&, const char*, size_t, boost::interprocess::detail::true_)': /home/robert/opt/boost/boost/boost/interprocess/detail/managed_open_or_create_impl.hpp:255: error: 'create_only' was not declared in this scope /home/robert/opt/boost/boost/boost/interprocess/shared_memory_object.hpp: At global scope: /home/robert/opt/boost/boost/boost/interprocess/shared_memory_object.hpp:59: error: expected `)' before ',' token /home/robert/opt/boost/boost/boost/interprocess/shared_memory_object.hpp:65: error: expected `)' before ',' token /home/robert/opt/boost/boost/boost/interprocess/shared_memory_object.hpp:70: error: expected `)' before ',' token /home/robert/opt/boost/boost/boost/interprocess/shared_memory_object.hpp:135: error: 'boost::interprocess::detail::create_enum_t' has not been declared /home/robert/opt/boost/boost/boost/interprocess/shared_memory_object.hpp:273: error: 'boost::interprocess::shared_memory_object::priv_open_or_create' declared as an 'inline' variable /home/robert/opt/boost/boost/boost/interprocess/shared_memory_object.hpp:273: error: 'bool boost::interprocess::shared_memory_object::priv_open_or_create' is not a static member of 'class boost::interprocess::shared_memory_object' /home/robert/opt/boost/boost/boost/interprocess/shared_memory_object.hpp:273: error: 'create_enum_t' is not a member of 'boost::interprocess::detail' /home/robert/opt/boost/boost/boost/interprocess/shared_memory_object.hpp:274: error: expected primary-expression before 'const' /home/robert/opt/boost/boost/boost/interprocess/shared_memory_object.hpp:275: error: expected primary-expression before 'mode' /home/robert/opt/boost/boost/boost/interprocess/shared_memory_object.hpp:275: error: initializer expression list treated as compound expression /home/robert/opt/boost/boost/boost/interprocess/shared_memory_object.hpp:276: error: expected ',' or ';' before '{' token /home/robert/opt/boost/boost/boost/interprocess/managed_shared_memory.hpp:68: error: expected `)' before 'create_only' /home/robert/opt/boost/boost/boost/interprocess/managed_shared_memory.hpp:79: error: expected `)' before 'open_or_create' /home/robert/opt/boost/boost/boost/interprocess/managed_shared_memory.hpp:90: error: expected `)' before 'open_only' ../atest/doc_vectorstream.cpp: In function 'int main()': ../atest/doc_vectorstream.cpp:37: error: 'create_only' was not declared in this scope make: *** [atest/doc_vectorstream.o] Fehler 1

2 1

Re: [Boost-users] [iostreams] compilation error with wstring
by Chad Walters 24 Jul '07

24 Jul '07

> Date: Tue, 24 Jul 2007 15:48:52 +0200 > From: Pipoun <pipoun(a)gmail.com> > > I'm trying to use the iostream libs using wstring, but I'm struggling > with wstring. > <snip> This might be related to a bug I filed a little while ago -- a simple copy-paste bug as far as I can tell: http://svn.boost.org/trac/boost/ticket/1003 Try applying my patch and see if it fixes it. Chad Walters

2 1

[iostreams] compilation error with wstring
by Pipoun 24 Jul '07

24 Jul '07

Hello, I'm trying to use the iostream libs using wstring, but I'm struggling with wstring. Her is my little piece of code: using namespace std; using namespace boost; struct Formatter { std::wstring operator() ( const match_results<const wchar_t*>& _Match ) { //TODO return wstring(); } }; int main(int argc, char** argv) { wstring File; //skipped steps to put data in wregex Regx(L"bla"); iostreams::wregex_filter Filter( Regx, Formatter() ); iostreams::filtering_wostream Out; Out.push( Filter ); Out.push( iostreams::wfile_sink("FilenameFormatted.txt") ); Out << File; } I'm using boost 1_34. If I compile this code vith vc80 express, I get an error: boost/iostreams/filter/aggregate.hpp(97) : error C2664: 'void boost::iostreams::aggregate_filter<Ch,Alloc>::do_write<Sink>(Sink &,const char *,std::streamsize)' : cannot convert parameter 2 from 'wchar_t *' to 'const char *' I'm a little lost :( Am I doing something wrong? Thank you very much for your help! pipoun

1 0

[foreach] boost_foreach_is_lightweight_proxy doesn't work
by Raider 24 Jul '07

24 Jul '07

Hi, i'm trying to modify rvalue container using Boost.ForEach: #include <string> #include <vector> #include <boost/foreach.hpp> typedef std::vector<std::string> vec; inline boost::mpl::true_ * boost_foreach_is_lightweight_proxy(vec *&, boost::foreach::tag) { return 0; } vec GetVector() { vec v; v.push_back("hello"); v.push_back("world"); return v; } int main() { // compiles ok GetVector().push_back("oh god, it's writable!"); // next line gives "unable to convert `const string' to `string&'" BOOST_FOREACH(std::string& String, GetVector()) String.clear(); return 0; } It doen't compiles (MCVC 8.0) - it looks like boost_foreach_is_lightweight_proxy is ignored. What's wrong?

2 7

Boost.signals has no shared_connection
by gast128 24 Jul '07

24 Jul '07

Dear all, I was playing with Boost.Signals and stumbles across a problem which required something like the equivalent of a shared_connenction, i.e. the last reference to it will finally disconnent. This can of course be simulated with a boost::shared_ptr<scoped_connection>, but native support for it is always preferable. The use is that some change manager returns a connection which goes through several application layers. The time the connection finally arives at destination, it has felt multiple ctor's and dtors: View::View(Doc* p) : m_con(p->Register(&OnUpdate) { } shared_connection Doc::Register(void (View::* pmf)(), View* p) { return m_pCm->Register(pmf, p) } etc.. Or did I not read the documentation properly? Wkr, me

1 0

[statechart]LNK2001 Error on VC 8.0
by Jiang Miao 24 Jul '07

24 Jul '07

Here is a tutorial. I compile succeeded at DEBUG mode, but failed at RELEASE mode. And I got LNK2001 Error. #include <boost/statechart/event.hpp> #include <boost/statechart/state_machine.hpp> #include <boost/statechart/simple_state.hpp> #include <boost/statechart/transition.hpp> namespace sc = boost::statechart; struct EvStartStop : sc::event< EvStartStop > {}; struct EvReset : sc::event< EvReset > {}; struct Active; struct StopWatch : sc::state_machine< StopWatch, Active > {}; struct Stopped; struct Active : sc::simple_state< Active, StopWatch, Stopped > { typedef sc::transition< EvReset, Active > reactions; }; struct Running : sc::simple_state< Running, Active > { typedef sc::transition< EvStartStop, Stopped > reactions; }; struct Stopped : sc::simple_state< Stopped, Active > { typedef sc::transition< EvStartStop, Running > reactions; }; // A state can define an arbitrary number of reactions. That's // why we have to put them into an mpl::list<> as soon as there // is more than one of them // (see Specifying multiple reactions for a state). int main() { StopWatch myWatch; myWatch.initiate(); myWatch.process_event( EvStartStop() ); myWatch.process_event ( EvStartStop() ); myWatch.process_event( EvStartStop() ); myWatch.process_event( EvReset() ); return 0; } //Output Linking... statechart.obj : error LNK2001: unresolved external symbol "public: void __thiscall boost::statechart::detail::no_context<struct EvReset>::no_function(struct EvReset const &)" (?no_function@?$no_context@UEvReset@@@ detail@statechart @boost@@QAEXABUEvReset@@@Z) statechart.obj : error LNK2001: unresolved external symbol "public: void __thiscall boost::statechart::detail::no_context<struct EvStartStop>::no_function(struct EvStartStop const &)" (?no_function@?$no_context@UEvStartStop@@@ detail@statechart @boost@@QAEXABUEvStartStop@@@Z) i:\programme\test\statechart\Release\statechart.exe : fatal error LNK1120: 2 unresolved externals How can I solve the problem? Thank you.

3 2

[statechart] context<>() assert failed in destructor function in VC8.0
by Jiang Miao 24 Jul '07

24 Jul '07

I wrote a simple code. source file: #include <boost/statechart/event.hpp> #include <boost/statechart/transition.hpp> #include <boost/statechart/simple_state.hpp> #include <boost/statechart/state.hpp> #include <boost/statechart/state_machine.hpp> #include <boost/statechart/custom_reaction.hpp> #include <boost/shared_ptr.hpp> #include <boost/weak_ptr.hpp> #include <boost/mpl/list.hpp> #include <iostream> #include <string> using namespace std; namespace sc=boost::statechart; namespace mpl=boost::mpl; struct EvtEat:sc::event<EvtEat>{}; struct EvtStop:sc::event<EvtStop>{}; struct Eating; struct Idle; class Human:public sc::state_machine< Human, Idle > { public: void show(void) { cout<<__FUNCTION__<<endl; } }; struct Idle:sc::state< Idle, Human > { Idle(my_context ctx):my_base(ctx) { context<Human>().show(); //ok }; ~Idle(void) { context<Human>().show(); //assert failed }; }; struct Eating:sc::state< Eating, Human > { Eating(my_context ctx):my_base(ctx) { }; ~Eating(void) { context<Human>(); } }; int main(int argc, char* argv[]) { Human human; human.initiate(); return 0; } /* In debug mode.It output Human::show Assertion failed: dynamic_cast<Target>(x) == x, file p:\programme\libs\boost\include\boost-1_35\boost\cast.hpp, line 97 */ Why does it assert failed and how to modify the source? Thank you.

3 2

Re: [Boost-users] [Serialization] is_serializable trait?
by Roman Perepelitsa 24 Jul '07

24 Jul '07

> Re: [Serialization] is_serializable trait? (Chris Fairles) > > I also took a stab at making a boostified version: > > #include <iostream> > #include <boost/type_traits/config.hpp> > #include <boost/utility/enable_if.hpp> > #include <boost/type_traits/is_fundamental.hpp> > #include <boost/type_traits/detail/yes_no_type.hpp> > #include <boost/type_traits/detail/bool_trait_def.hpp> > > namespace boost { > namespace detail { > > template <class T> > struct has_serialize_mem_fun { > typedef void (T::*SerializationFun)(int &, unsigned); > > template <SerializationFun> > struct A {}; > > template <class Q> > static ::boost::type_traits::yes_type > has_serialize_mem_fun_tester(A<&Q::serialize>*); > > template <class Q> > static ::boost::type_traits::no_type has_serialize_mem_fun_tester(...); > > BOOST_STATIC_CONSTANT(bool, value = > (sizeof(has_serialize_mem_fun_tester<T>(0)) == > sizeof(::boost::type_traits::yes_type))); > > }; > template <typename T, typename IsFundamental = void> > struct is_serializable_impl > { > BOOST_STATIC_CONSTANT(bool, value = has_serialize_mem_fun<T>::value); > }; > > template <typename T> > struct is_serializable_impl<T, typename ::boost::enable_if< > ::boost::is_fundamental<T> >::type> > { > BOOST_STATIC_CONSTANT(bool, value = true); > }; > } > > BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_serializable,T,::boost::detail::is_serializable_impl<T>::value) > > } > > struct A { > template <class Stream> > void serialize(Stream & strm, unsigned version) {} > }; > > struct B {}; > > struct C { void serialize() {} }; > > int main() > { > using namespace std; > cout > << boolalpha > << boost::is_serializable<A>::value << '\n' // true > << boost::is_serializable<int>::value << '\n' // true > << boost::is_serializable<float>::value << '\n' // true > << boost::is_serializable<double>::value << '\n' // true > << boost::is_serializable<char>::value << '\n' // true > << boost::is_serializable::value << '\n' // false > << boost::is_serializable<C>::value << '\n' // false > << boost::is_serializable<string>::value << endl; //false but > should be true > } > > Needs specializations for standard containers as well but this suits > my needs currently. Thoughts? I tried to implement is_non_intrusively_serializable metafunction, but found no general solution. Although I've impelented it for all types which are instances of some class template. For example, it works correctly for vector<int>, some_class<double, string>, etc. Note that it is possible to create metafunction which determines whether type is instance of class template or not. So, we have the following: - is_intrusivelly_serializable metafunction. - is_class_template_instance metafunction. - is_non_intrusively_serializable metafunction, which currently works only for class template instances. Probably someone can implement the last missing case? That is we need is_non_intrusively_serializable implementation for types, which are not class template instances (int, some_nontemplate_class, etc). Here is is_non_intrusively_serializable restricted to class templates. #include <boost/serialization/serialization.hpp> #include <boost/type_traits/remove_cv.hpp> #include <boost/type_traits/detail/yes_no_type.hpp> #include <boost/preprocessor.hpp> #include <boost/static_assert.hpp> #include <boost/serialization/vector.hpp> namespace detail { struct tag {}; using boost::serialization::serialize; #define BOOST_PP_LOCAL_LIMITS (1, 10) #define BOOST_PP_LOCAL_MACRO(N) \ template < \ class Archive, \ template <BOOST_PP_ENUM_PARAMS(N, class I)> class T, \ BOOST_PP_ENUM_PARAMS(N, class T) \ > \ tag serialize( \ Archive & ar, \ T<BOOST_PP_ENUM_PARAMS(N, T)> &, \ const unsigned \ ); #include BOOST_PP_LOCAL_ITERATE() tag operator,(tag, int); boost::type_traits::no_type check(tag); template <class T> boost::type_traits::yes_type check(T const&); template <class T> struct impl { static typename boost::remove_cv<T>::type & x; static const int & archive; static const unsigned version; static const bool value = sizeof(check((serialize(archive, x, version), 0))) == sizeof(boost::type_traits::yes_type); }; } template <class T> struct is_non_intrusively_serializable : detail::impl<T> {}; template <class T> struct A {}; int main() { BOOST_STATIC_ASSERT( is_non_intrusively_serializable<std::vector<int> >::value); BOOST_STATIC_ASSERT( !is_non_intrusively_serializable<A<int> >::value); } Regards, Roman Perepelitsa Deutsche Bank Moscow +7 (495) 660-74-08 --- This e-mail may contain confidential and/or privileged information. If you are not the intended recipient (or have received this e-mail in error) please notify the sender immediately and delete this e-mail. Any unauthorized copying, disclosure or distribution of the material in this e-mail is strictly forbidden. Please refer to http://www.db.com/en/content/eu_disclosures.htm for additional EU corporate and regulatory disclosures.

1 0

Detecting Valid Expressions for a Type at Compile-Time
by Martin Ecker 24 Jul '07

24 Jul '07

Hi, Is there a way, using SFINAE tricks and potentially the techniques used in the Boost Concept Check Library, to detect at compile-time if a type T supports a certain expression? In my case, I'm interested if T supports operator ==. So I'm basically looking for a compile-time predicate so that this compiles: struct my_struct { int i; }; struct my_struct2 { int i; }; bool operator == (my_struct2 const&, my_struct2 const&) const; BOOST_STATIC_ASSERT((supports_comparison_operator<int>::value)); BOOST_STATIC_ASSERT((!supports_comparison_operator<my_struct>::value)); BOOST_STATIC_ASSERT((supports_comparison_operator<my_struct2>::value)); Thanks, Martin

3 4

Serialization
by Alejandro Rubinos Carbajal 23 Jul '07

23 Jul '07

How can i serialize an object of the class tm that belongs to time.h, and also i will like to serialize a char * object. Thanks

1 0

[intrusive][interprocess] Online documentation site changed
by Ion Gaztañaga 23 Jul '07

23 Jul '07

Hi to all, Due to recent problems with the automatically generated Boost documentation in Boost CVS and some other problems with my old website, I've just uploaded up-to-date (CVS HEAD documentation) Boost.Intrusive and Boost.Interprocess documentation to these sites: http://igaztanaga.drivehq.com/intrusive http://igaztanaga.drivehq.com/interprocess These sites have no ads, so I expect better user experience. I've requested the cancellation of the old site (www.prohosting.com) so I hope this helps Intrusive and Interprocess user experience until Boost 1.35 is released. Regards, Ion

1 0

Re: [Boost-users] [Serialization] is_serializable trait?
by Roman Perepelitsa 23 Jul '07

23 Jul '07

> Chris Fairles" <chris.fairles(a)gmail.com> on Fri, 20 Jul 2007 18:03:18 -0400 > How can you determine (compile-time) that a class has a serialize function? > > struct foo { > template <typename Archive> > void serialize (Archive &, const unsigned int); > }; > > "&foo::serialize" isn't a type and I can't figure out a way to make it > a type (besides a typedef in the class) and also a constant > expression. > > Tried to play around with this as well but theres no substitution > failure here and static functions can't be constant expressions > (commonnnn c++0x!!) > > struct serialize { > template <typename T> > static void value(T const&) { void(T::*f)(archive::xml_oarchive &, > const unsigned int) = &T::template serialize<archive::xml_oarchive>; > (void)f; } > }; > > Basically, in the code below I want to see "GoodGood" printed out and > the only thing I can change is Q. > > struct A{ > void f(int,int){} > }; > struct B{}; > > template <class T,class F=void> > struct Q{enum{value=false};}; > > template<class T> struct Q<T,void(T::serialize)(int,int)>{enum{value=true};}; > > int main(){ > if(Q<A>::value) { cout << "Good";} > if(!Q::value){ cout << "Good";} > } > > Help/hints/remotely possible? You can try something like this. #include <iostream> #include <iomanip> typedef char yes_type; struct no_type { char padding[8]; }; template <class T> struct HasSerializeMember { typedef void (T::*SerializationFun)(int &, unsigned); template <SerializationFun> struct A {}; template <class Q> static yes_type Test(A<&Q::serialize>*); template <class Q> static no_type Test(...); static const bool value = sizeof(Test<T>(0)) == sizeof(yes_type); }; struct A { template <class Stream> void serialize(Stream & strm, unsigned version) {} }; struct B { }; struct C { void serialize() {} }; int main() { using namespace std; cout << boolalpha << HasSerializeMember<A>::value << '\n' // true << HasSerializeMember::value << '\n' // false << HasSerializeMember<C>::value << endl; // false } Regards, Roman Perepelitsa Deutsche Bank Moscow +7 (495) 660-74-08 --- This e-mail may contain confidential and/or privileged information. If you are not the intended recipient (or have received this e-mail in error) please notify the sender immediately and delete this e-mail. Any unauthorized copying, disclosure or distribution of the material in this e-mail is strictly forbidden. Please refer to http://www.db.com/en/content/eu_disclosures.htm for additional EU corporate and regulatory disclosures.

3 3

[Boost.Test] warning C4265 when including <boost/test/unit_test.hpp> and friends
by Pierre-Jules Tremblay 23 Jul '07

23 Jul '07

Just trying out Boost 1.34.1RC3, I found this in <boost/test/detail/config.hpp>, lines 65-70: #ifdef __GNUC__ #define BOOST_TEST_PROTECTED_VIRTUAL virtual #else #define BOOST_TEST_PROTECTED_VIRTUAL #endif perhaps the condition should be changed to include MSVC8(SP1), to eliminate multiple copies of this annoying warning: xxxxx.hpp(54) : warning C4265: 'boost::unit_test::test_observer' : class has virtual functions, but destructor is not virtual Cheers, pj

2 2

Re: [Boost-users] Problem with unit test BOOST_AUTO_TEST_MAIN
by Sakharuk, Vlad (GMI Development) 23 Jul '07

23 Jul '07

I have found the problem (and the answer). Someone recompiled TinyXml lib from executable with main function included. And that function was called instead of test one. Gennadiy, Thanks for help. Regards Vlad. -----Original Message----- From: boost-users-bounces(a)lists.boost.org [mailto:boost-users-bounces@lists.boost.org] On Behalf Of Gennadiy Rozental Sent: Thursday, July 19, 2007 1:47 PM To: boost-users(a)lists.boost.org Subject: Re: [Boost-users] Problem with unit test BOOST_AUTO_TEST_MAIN "Sakharuk, Vlad (GMI Development)" <Vlad_Sakharuk(a)ml.com> wrote in message news:AAA38056FF35DE4CB4A65657784B08FAA9E0A6@MLNYC730MB.amrs.win.ml.com.. . > Yes, if I remove all lib it does run successfully. > I identified that tests run from TinyXML lib (opensource). > > I have to link with other libraries because the code I have to test > depends on them. I am just creating tast case to narrow down the > problem. > > I will look in 1.34.o but probably I could not. > > I will apriceate any solution how to disable particular testing suit > (from TinyXML). I could not physically remove those test from the lib. > > Thanks Vlad This is impossible naturally in current version of Boost.Test. I will look into allowing you to do this in 1.35.0. The only thing you can try to do (in 1.34) is massage master test suite somehow in test module init function. Gennadiy _______________________________________________ Boost-users mailing list Boost-users(a)lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users -------------------------------------------------------- This message w/attachments (message) may be privileged, confidential or proprietary, and if you are not an intended recipient, please notify the sender, do not use or share it and delete it. Unless specifically indicated, this message is not an offer to sell or a solicitation of any investment products or other financial product or service, an official confirmation of any transaction, or an official statement of Merrill Lynch. Subject to applicable law, Merrill Lynch may monitor, review and retain e-communications (EC) traveling through its networks/systems. The laws of the country of each sender/recipient may impact the handling of EC, and EC may be archived, supervised and produced in countries other than the country in which you are located. This message cannot be guaranteed to be secure or error-free. This message is subject to terms available at the following link: http://www.ml.com/e-communications_terms/. By messaging with Merrill Lynch you consent to the foregoing. -------------------------------------------------------- "Please consider the environment before printing this email."

1 0

iterator_facade and custom reference types
by Daniel Oberhoff 23 Jul '07

23 Jul '07

hi I am struggling with iterator_face. I have a container of bits with a smart reference type. This is because the exposed type is bool, but there is never a full boolean variable around for an index, just a single bit. So whenever a reference to a bool is requested I want to pass my smart reference that knows how to get and set this bit. But iterator_facade is too smart for this: it wants to make a true reference to a supplied Value type, which results in references to temporaries. Is there any way to tell iterator_facade to use my type as a ref type? Daniel Oberhoff

2 1

shared_ptr + vector + std::sort
by bringiton bringiton 23 Jul '07

23 Jul '07

hi guys, just wondering if you have any shared_ptr tips for sorting vectors [code] std::vector< boost::shared_ptr<int> > v; //.. insert items into vector std::sort(v.begin(), v.end()); [/code] OK this doesn't sort by integer. I was hoping shared_ptrs < operator actually used the < operator of it's template type. however, i guess it's sorting by pointer value... the following works OK: [code] template <class T> struct X { bool operator()(const boost::shared_ptr<T>& a, const boost::shared_ptr<T>& b) { return *a < *b; } }; int main() { std::vector< boost::shared_ptr<int> > v; //.. insert items into vector std::sort(v.begin(), v.end(), X<int>()); return 0; } [/code] Does anyone have a better way of doing this? Maybe boost already defines a function similar to my X function. Maybe there is a way without using a predicate...

2 1

Non-throwing version of filesystem::create_directories?
by Olaf van der Spek 23 Jul '07

23 Jul '07

Hi, Is there a non-throwing version of filesystem::create_directories? Before I used normal C/POSIX APIs that returned an error value and I don't want to wrap each call in a try/catch statement. Olaf

1 0

[fusion/tr1] Include path problem?
by Kimon Hoffmann 23 Jul '07

23 Jul '07

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi all, while setting up the include paths as specified in the TR1 documentation I stumbled across a Boost.Fusion related compile error (included indirectly from <xpressive/proto/proto.hpp> in my code). After stepping through the include hierarchy, I was able to extract this minimal example, that demonstrates the problem: - -------- START: Test.cpp -------- // Originally included from <boost/xpressive/proto/proto_fwd.hpp> #include <boost/spirit/fusion/sequence/tuple_forward.hpp> // Originally included from #include <boost/xpressive/proto/op_base.hpp> #include <boost/spirit/fusion/sequence/tuple.hpp> - -------- END: Test.cpp -------- With MSVC++ 8.0 SP1 This file fails to compile with certain include path orderings while it compiles fine with others. The error messages are: ...\boost\spirit\fusion\sequence\make_tuple.hpp(23) : error C2027: use of undefined type 'boost::fusion::tuple<>' ...\boost\spirit\fusion\sequence\make_tuple.hpp(23) : error C2079: 'boost::fusion::make_tuple' uses undefined struct 'boost::fusion::tuple<>' ...\include\boost\spirit\fusion\sequence\make_tuple.hpp(24) : error C2514: 'boost::fusion::tuple<>' : class has no constructors Working include path orderings: 1. Any include path ordering that doesn't contain Boost.TR1 2. VC++ Standard Library, regular Boost, Boost.TR1 3. VC++ Standard Library, Boost.TR1, regular Boost Non-working include path orderings: 1. Boost.TR1, regular Boost, VC++ Standard Library [*] 2. Regular Boost, Boost.TR1, VC++ Standard Library [*] Preferred Boost.TR1 setting Generally speaking I would not consider this a problem, as I can simply order the include directories accordingly, but, as far as I understand it, Boost.TR1 can not be expected to work correctly with any of these settings. Regards, Kimon -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.4 (MingW32) iD8DBQFGn3ceIISObEqaPr4RAiszAJ9ipiY+qK+lLg8uDPnHEZejyA5ShwCfQ0fC 1vOMnumqPnguAgtv7co2N8c= =MIsY -----END PGP SIGNATURE-----

3 12

[IBD] Weekly news: 2007-07-11 to 2007-07-17
by Matias Capeletto 22 Jul '07

22 Jul '07

================================================== Hi Boost, Once a week, we will send you a brief of our work for the Improving Boost Docs project. We need more hands, join us! We are waiting you on the boost-docs list. Project Wiki: http://svn.boost.org/trac/boost/wiki/ImprovingBoostDocs RSS news feed: http://beta.boost.org/development/ibd_news.rss Community Blog: http://improving-boost-docs.blogspot.com ================================================== A bussy week ------------------------------------------------------------------------------------- Sorry for the delay, It was a busy week. I have started to promote IBD in Argentina... we may get some friendly hands from my country in the future. Kudos to all IBDers... the boost-docs list activity is truly impressive. 2007-07-17 ------------------------------------------------------------------------------------- * Proofreading of the IBD Wiki is almost complete Kudos to Jake and Paul! more... http://tinyurl.com/3234qk * Kai joins IBD He will be working at the "Trac Syntax Coloring Project". Thanks you so much for jumping in! more... http://tinyurl.com/3d6mwe 2007-07-16 ------------------------------------------------------------------------------------- * IBD welcomes Kai Brüning It will be great to count with his help. Lets work to make him feel comfortable in the Boost community. more... http://tinyurl.com/2to8bg 2007-07-15 ------------------------------------------------------------------------------------- * Translation project moved to Helping Boost Authors The translation project is now part of the new section "Helping Boost Authors". We hope this section will become the main communication channel between Boost Authors and IBD developers. more... http://svn.boost.org/trac/boost/wiki/HelpingBoostAuthors 2007-07-14 ------------------------------------------------------------------------------------- * Helping Boost Authors We have a new resource at IBD: a section in the project Wiki called "Helping Boost Authors". This section is a bazaar of friendly hands. We are teachers, experienced users, native English speakers and artists. We want to offer our help to Boost authors to improve their documentation. more... http://svn.boost.org/trac/boost/wiki/HelpingBoostAuthors 2007-07-13 ------------------------------------------------------------------------------------- * Documentation Best Practices The first guideline was added to the section "Documentation Best Practices". There are currently more documents to add here, we will try to fill this section with useful information for Boost Authors. more... http://svn.boost.org/trac/boost/wiki/DocumentationBestPractices 2007-07-12 ------------------------------------------------------------------------------------- * Proofreading of IBD Wiki starts Jake and Paul first project will be proofread the IBD Wiki pages. more... http://tinyurl.com/3786jf 2007-07-11 ------------------------------------------------------------------------------------- * Glyn joins the community Blog We are eagerly waiting to read you. more... http://improving-boost-docs.blogspot.com

1 0

[program_options] incorrect documentation
by Bryan Green 22 Jul '07

22 Jul '07

In the documentation for program_options, under the "Library Overview"/"Syntactic Information", the documentation appears to be incorrect. For the following option description: ("verbose", value<string>()->zero_tokens(), "verbosity level") It states that: "the user may either provide a single token for the value, or no token at all." I wrote a test program based on the options given in this section of the manual, and I get different behavior for the 'verbose' option. In fact, the actual behavior is almost intuitive: the option is unusable. No matter what you do, its an error. Seems natural since you're saying the option has a value associated with it, yet no tokens may be given to specify the value. It also turns out that 'multitoken()' does not allow you to pass multiple tokens, but it does raise an exception if you specify anything after the first value, i.e.: ./a.out --email blah@blah me@somewhere exception: in option 'email': multiple values not allowed ./a.out --email blah@blah --help exception: in option 'email': multiple values not allowed Here's my test program: <code> #include <boost/program_options.hpp> #include <string> #include <iostream> using namespace boost::program_options; using namespace std; int main(int argc,char *argv[]) { options_description desc; desc.add_options() ("help", "produce help message") ("compression", value<string>(), "compression level") ("verbose", value<string>()->zero_tokens(), "verbosity level") ("email", value<string>()->multitoken(), "email to send to") ; variables_map vm; try { store(parse_command_line(argc, argv, desc), vm); notify(vm); } catch (exception &e) { cout << "exception: " << e.what() << endl; return -1; } if (vm.count("help")) cout << desc << endl; if (vm.count("compression")) cout << "compression " << vm["compression"].as<string>() << endl; if (vm.count("verbose")) cout << "verbose " << vm["verbose"].as<string>() << endl; if (vm.count("email")) cout << "email " << vm["email"].as<string>() << endl; return 0; } </code> -Bryan

1 0

[boost.python] "Thin wrappers" for member functions
by Marcin Kalicinski 21 Jul '07

21 Jul '07

It's possible to expose free functions through "thin wrappers": void f() { //... } void f_wrapper() { // ... some extra functionality to be done when called from Python only f(); } def("f", f_wrapper); But is it possible to write "thin wrappers" for member functions (without modifying the wrapped class)? struct foo { void f(); }; // f_wrapper defined somehow somewhere class_<foo>("foo") .def("f", f_wrapper???) Thanks, Marcin

2 1

Serialization valgrind reports errors in load() ...
by Sascha Ochsenknecht 21 Jul '07

21 Jul '07

Hello, I have following class which I want to serialize: template < class ValueType > class Values { private: vector< ValueType > _values; public: Values(unsigned p_nr, const ValueType& p_value) : _values(p_nr, p_value) {} Values() {} private: friend class boost::serialization::access; template < class Archive > void load(Archive& p_ar, unsigned /*p_version*/) { p_ar & _values; } template < class Archive > void save(Archive& p_ar, unsigned /*p_version*/) const { p_ar & _values; } BOOST_SERIALIZATION_SPLIT_MEMBER(); }; My main() looks very simple: ... // save const Values<std::string> a(3, "fritz"); { std::ofstream ofs("fritz.txt"); boost::archive::text_oarchive ar(ofs); ar << a; } // restore Values<std::string> b; { std::ifstream ifs("fritz.txt"); boost::archive::text_iarchive ar(ifs); ar >> b; } valgrind reports me following errors (the load() seems to be the problem): ==13202== Conditional jump or move depends on uninitialised value(s) ==13202== at 0x4E59F72: boost::archive::detail::basic_iarchive::reset_object_address(void const*, void const*) (in /usr/lib64/libboost_serialization.so.1.33.1) ==13202== by 0x408A2C: boost::serialization::stl::archive_input_seq<boost::archive::text_iarchive, std::vector<std::string, std::allocator<std::string> > >::operator()(boost::archive::text_iarchive&, std::vector<std::string, std::allocator<std::string> >&) (collections_load_imp.hpp:54) ==13202== by 0x408ABD: void boost::serialization::stl::rebuild_collection<boost::archive::text_iarchive, std::vector<std::string, std::allocator<std::string> >, boost::serialization::stl::archive_input_seq<boost::archive::text_iarchive, std::vector<std::string, std::allocator<std::string> > >, boost::serialization::stl::reserve_imp<std::vector<std::string, std::allocator<std::string> > > >(boost::archive::text_iarchive&, std::vector<std::string, std::allocator<std::string> >&) (collections_load_imp.hpp:149) ==13202== by 0x408AF7: void boost::serialization::stl::load_collection<boost::archive::text_iarchive, std::vector<std::string, std::allocator<std::string> >, boost::serialization::stl::archive_input_seq<boost::archive::text_iarchive, std::vector<std::string, std::allocator<std::string> > >, boost::serialization::stl::reserve_imp<std::vector<std::string, std::allocator<std::string> > > >(boost::archive::text_iarchive&, std::vector<std::string, std::allocator<std::string> >&) (collections_load_imp.hpp:171) ==13202== by 0x408B1E: void boost::serialization::load<boost::archive::text_iarchive, std::string, std::allocator<std::string> >(boost::archive::text_iarchive&, std::vector<std::string, std::allocator<std::string> >&, unsigned) (vector.hpp:58) ==13202== by 0x408B5D: boost::serialization::free_loader<boost::archive::text_iarchive, std::vector<std::string, std::allocator<std::string> > >::invoke(boost::archive::text_iarchive&, std::vector<std::string, std::allocator<std::string> >&, unsigned) (split_free.hpp:58) ==13202== by 0x408B87: void boost::serialization::split_free<boost::archive::text_iarchive, std::vector<std::string, std::allocator<std::string> > >(boost::archive::text_iarchive&, std::vector<std::string, std::allocator<std::string> >&, unsigned) (split_free.hpp:74) ==13202== by 0x408BB1: void boost::serialization::serialize<boost::archive::text_iarchive, std::string, std::allocator<std::string> >(boost::archive::text_iarchive&, std::vector<std::string, std::allocator<std::string> >&, unsigned) (vector.hpp:76) ==13202== by 0x408BEF: void boost::serialization::serialize_adl<boost::archive::text_iarchive, std::vector<std::string, std::allocator<std::string> > >(boost::archive::text_iarchive&, std::vector<std::string, std::allocator<std::string> >&, unsigned) (serialization.hpp:140) ==13202== by 0x408C29: boost::archive::detail::iserializer<boost::archive::text_iarchive, std::vector<std::string, std::allocator<std::string> > >::load_object_data(boost::archive::detail::basic_iarchive&, void*, unsigned) const (iserializer.hpp:160) ==13202== by 0x4E5A5B9: boost::archive::detail::basic_iarchive::load_object(void*, boost::archive::detail::basic_iserializer const&) (in /usr/lib64/libboost_serialization.so.1.33.1) ==13202== by 0x4095F7: boost::archive::detail::load_non_pointer_type<boost::archive::text_iarchive, std::vector<std::string, std::allocator<std::string> > >::load_standard::invoke(boost::archive::text_iarchive&, std::vector<std::string, std::allocator<std::string> >&) (iserializer.hpp:375) ==13202== ==13202== Conditional jump or move depends on uninitialised value(s) ==13202== at 0x4E59FA1: boost::archive::detail::basic_iarchive::reset_object_address(void const*, void const*) (in /usr/lib64/libboost_serialization.so.1.33.1) ==13202== by 0x408A2C: boost::serialization::stl::archive_input_seq<boost::archive::text_iarchive, std::vector<std::string, std::allocator<std::string> > >::operator()(boost::archive::text_iarchive&, std::vector<std::string, std::allocator<std::string> >&) (collections_load_imp.hpp:54) ==13202== by 0x408ABD: void boost::serialization::stl::rebuild_collection<boost::archive::text_iarchive, std::vector<std::string, std::allocator<std::string> >, boost::serialization::stl::archive_input_seq<boost::archive::text_iarchive, std::vector<std::string, std::allocator<std::string> > >, boost::serialization::stl::reserve_imp<std::vector<std::string, std::allocator<std::string> > > >(boost::archive::text_iarchive&, std::vector<std::string, std::allocator<std::string> >&) (collections_load_imp.hpp:149) ==13202== by 0x408AF7: void boost::serialization::stl::load_collection<boost::archive::text_iarchive, std::vector<std::string, std::allocator<std::string> >, boost::serialization::stl::archive_input_seq<boost::archive::text_iarchive, std::vector<std::string, std::allocator<std::string> > >, boost::serialization::stl::reserve_imp<std::vector<std::string, std::allocator<std::string> > > >(boost::archive::text_iarchive&, std::vector<std::string, std::allocator<std::string> >&) (collections_load_imp.hpp:171) ==13202== by 0x408B1E: void boost::serialization::load<boost::archive::text_iarchive, std::string, std::allocator<std::string> >(boost::archive::text_iarchive&, std::vector<std::string, std::allocator<std::string> >&, unsigned) (vector.hpp:58) ==13202== by 0x408B5D: boost::serialization::free_loader<boost::archive::text_iarchive, std::vector<std::string, std::allocator<std::string> > >::invoke(boost::archive::text_iarchive&, std::vector<std::string, std::allocator<std::string> >&, unsigned) (split_free.hpp:58) ==13202== by 0x408B87: void boost::serialization::split_free<boost::archive::text_iarchive, std::vector<std::string, std::allocator<std::string> > >(boost::archive::text_iarchive&, std::vector<std::string, std::allocator<std::string> >&, unsigned) (split_free.hpp:74) ==13202== by 0x408BB1: void boost::serialization::serialize<boost::archive::text_iarchive, std::string, std::allocator<std::string> >(boost::archive::text_iarchive&, std::vector<std::string, std::allocator<std::string> >&, unsigned) (vector.hpp:76) ==13202== by 0x408BEF: void boost::serialization::serialize_adl<boost::archive::text_iarchive, std::vector<std::string, std::allocator<std::string> > >(boost::archive::text_iarchive&, std::vector<std::string, std::allocator<std::string> >&, unsigned) (serialization.hpp:140) ==13202== by 0x408C29: boost::archive::detail::iserializer<boost::archive::text_iarchive, std::vector<std::string, std::allocator<std::string> > >::load_object_data(boost::archive::detail::basic_iarchive&, void*, unsigned) const (iserializer.hpp:160) ==13202== by 0x4E5A5B9: boost::archive::detail::basic_iarchive::load_object(void*, boost::archive::detail::basic_iserializer const&) (in /usr/lib64/libboost_serialization.so.1.33.1) ==13202== by 0x4095F7: boost::archive::detail::load_non_pointer_type<boost::archive::text_iarchive, std::vector<std::string, std::allocator<std::string> > >::load_standard::invoke(boost::archive::text_iarchive&, std::vector<std::string, std::allocator<std::string> >&) (iserializer.hpp:375) I don't see any mistakes in my client code. Seems to be a problem of the boost::serialization library. (I'm using boost 1.33.1) Should I create a bug entry for that, or is it already known? Regards, Sascha

4 9

Boost multi_array declaration inside class header
by GQ Chen 21 Jul '07

21 Jul '07

Hi, I have some troubles in compiling the following simple code, tboost.hpp, tboost.cpp The problem is always from the declaration of array_type A(boost::extents[2000000][1]); in the header file. Error message from compiling, In file included from tboost.cpp:2: tboost.h:14: error: `extents' has not been declared boost.h:14: error: ISO C++ forbids declaration of `parameter' with no type If I define array_type A(boost::extents[2000000][1]); in the source code tboost.cpp, it will compile successfully. Could anyone help me to solve it? Thanks a lot, gq tboost.hpp #include <cassert> #include <stdio.h> #include <iostream> #include "boost/multi_array.hpp" typedef boost::multi_array<double, 2> array_type; class tboost { public: tboost(){}; ~tboost(){}; public: array_type A(boost::extents[2000000][1]); }; #endif tboost.cpp #include "tboost.h" int main () { char c =getchar(); return 0; }

2 1

boost::format convert snprintf.
by chun ping wang 21 Jul '07

21 Jul '07

Hmm is there a way for boost::format to function like snprintf. Example char str[64]; std::cout << boost::format("%s") % str;

2 2

program_options, fvisibility=default, and Mac OS X
by James Jackson 20 Jul '07

20 Jul '07

Hi, Following on from this posting: http://lists.boost.org/boost-users/2007/02/25361.php I am having the same problem with program_options using std::string, compiling my code with gcc-4.0, using Xcode 2.2.1 on Mac OS X 10.4.9. Forcing -fvisibility=default onto the command line does not fix the problem. Do I need to rebuild the libraries with this flag (and if so, how?), or can somebody offer any other suggestions? Regards, James Jackson.

1 0

[Serialization] is_serializable trait?
by Sohail Somani 20 Jul '07

20 Jul '07

Hi, I know there is the tracking level trait. Is that sufficient to be able to say that T is serializable? struct T { T(some_stuff); private: some_non_default_constructing_members; }; In this case, I think tracking level will be set to track selectively but its not serializable as is. Thanks, Sohail

3 2

Graph Permutations of Order n
by Brian Stadler 20 Jul '07

20 Jul '07

Hi list, I'm attempting to create all graphs of order n, isomorphic graphs and all. Basically, with vertices V and Edges E, permutate through all possible variations. Does anyone on this list know of a simple way to do this with the boost graph library or, can point to some location that may help. thanks

2 1

Program Options: Documentation about response files out of date?
by Olaf van der Spek 20 Jul '07

20 Jul '07

Hi, [1] says: > The library does not provide direct support for response files, so you'll need to write some extra code. But this code does the trick without much extra code: std::ifstream is(vm["conf_file"].as<std::string>().c_str()); po::store(po::parse_config_file(is, desc), vm); Or is a response file something else? In that case, maybe that should be mentioned, as I think for lots of users this is enough. [1] http://boost.org/doc/html/program_options/howto.html#id1592676

2 2

[Optional 1.33.1] Assignment of convertible optional to an optional
by contact＠dword.dk 20 Jul '07

20 Jul '07

Hi, >From the documentation I think this should be possible: optional<unsigned short> us; optional<unsigned int> ui; ui = us; In this case it should just leave ui uninitialized. But instead I hit the assertion in reference_const_type get() const, because there is a call to rhs.get() in the operator=(). Is this a bug, or am I doing something wrong? I'm using MSVC7.1. Best regards, Christian Larsen

1 0

[ptr_container] "Cannot access private member..." compile error
by Dan Thill 20 Jul '07

20 Jul '07

Seeking ptr_container guru, My first usage of ptr_container, and I fear I'm missing something obvious. I keep getting the following compile error: -------------------------------------------- Z:\Tools\boost\boost_1_34_0\boost/ptr_container/detail/associative_ptr_container.hpp(202) : error C2248: 'boost::ptr_container_detail::reversible_ptr_container<Config,CloneAllocator>::reversible_ptr_container' : cannot access private member declared in class 'boost::ptr_container_detail::reversible_ptr_container<Config,CloneAllocator>' with [ Config=boost::ptr_container_detail::set_config<Abstract_Record,std::set<void *,boost::void_ptr_indirect_fun<std::less<Abstract_Record>,Abstract_Record>,std::allocator<void *>>>, CloneAllocator=boost::heap_clone_allocator ] Z:\Tools\boost\boost_1_34_0\boost/ptr_container/detail/reversible_ptr_container.hpp(286) : see declaration of 'boost::ptr_container_detail::reversible_ptr_container<Config,CloneAllocator>::reversible_ptr_container' with [ Config=boost::ptr_container_detail::set_config<Abstract_Record,std::set<void *,boost::void_ptr_indirect_fun<std::less<Abstract_Record>,Abstract_Record>,std::allocator<void *>>>, CloneAllocator=boost::heap_clone_allocator ] This diagnostic occurred in the compiler generated function 'boost::ptr_container_detail::associative_ptr_container<Config,CloneAllocator>::associative_ptr_container(const boost::ptr_container_detail::associative_ptr_container<Config,CloneAllocator> &)' with [ Config=boost::ptr_container_detail::set_config<Abstract_Record,std::set<void *,boost::void_ptr_indirect_fun<std::less<Abstract_Record>,Abstract_Record>,std::allocator<void *>>>, CloneAllocator=boost::heap_clone_allocator ] -------------------------------------------- My container is declared thusly: boost::ptr_set<Abstract_Record> And the relevant parts of -------------------------------------------- class Abstract_Record { public: Abstract_Record(); Abstract_Record* clone(); virtual bool operator<(const Abstract_Record&); private: Abstract_Record(const Abstract_Record&); }; -------------------------------------------- I'm having trouble deciphering the error message. I declared a new_clone() function as described in the docs. I also tried writing my own CloneAllocator. Neither have any effect. I would be very grateful for some insight, or even a nudge with a cluebat. -Dan

2 3

[boost.test] Test suits and autoregistration
by Stefan Shishkov 20 Jul '07

20 Jul '07

Hi, I'm using boost 1.33.1, but the question applies to 1.34 too. Is it possible to create tests suites that contain test cases from different translation units using only auto registration? Ex: in file1.cpp BOOST_AUTO_TEST_SUITE(BigSuite); auto-register test suites and cases here... BOOST_AUTO_TEST_SUITE_END(); in file2.cpp BOOST_AUTO_TEST_SUITE(BigSuite); auto-register other test suites and cases here... BOOST_AUTO_TEST_SUITE_END(); As result only one suite with name "BigSuite" should be registered. Best regards, Stefan

2 2

[program_options] Short Option Name
by Christian Henning 20 Jul '07

20 Jul '07

Hi there, I cannot get the short option name feature to work. For some reason an exception is being thrown when I use the short name. I'm using boost 1.34 on MSVC 8. Here is what I'm doing: #include <boost\program_options.hpp> using namespace std; using namespace boost; namespace po = boost::program_options; int main( int argc, char* argv[] ) { string input; po::options_description settings( "" ); settings.add_options() ( "input,I" , po::value< string >( &input ) ->default_value( "" ) , "" ); po::options_description options; options.add( settings ); po::variables_map variables; store( parse_command_line( argc , argv , settings ) , variables ); notify( variables ); cout << input << endl; return 0; } Using --input="hello" works but not -I="hello". What am I overlooking? Thanks ahead, Christian

3 4

"detail" namespace
by Chauhan, Vikas 20 Jul '07

20 Jul '07

Hi , Can you please advise , why boost has "detail" namespace? Is a kind of standard as most of the libraries also have a detail namespace for eg: boost::asio::detail, boost::archive::detail, boost::format::detail and so on... Thanks, Vikas

3 2

Problem with boost::transform_iterator, std::pairs and templates.
by Manuel Holtgrewe 19 Jul '07

19 Jul '07

Hi, I have a problem using the Boost.Iterators library correctly. The following minimal example does neither compile with GCC 4.2 nor with a current ICC 10.0 version. It seems that putting a boost::transform_iterator inside a pair makes it impossible to retrieve its value again using std::iterator_traits. I would welcome a proposal how to resolve the problem. I get the bug when using transform_iterator together with the MCSTL (Multi Core STL) and thus cannot change the internals. I would thus like to know if and how I can make the following work without touching the inner() and outer() functions themselves since I do not have the possibility to change the library code itself. Am I using boost::transform_iterator incorrectly? Kind Regards, Manuel == File Source == #include <iostream> #include <vector> #include <functional> #include <boost/iterator/transform_iterator.hpp> class plus_two : public std::unary_function<int, int> { public: int operator()(int x) const { return x + 2; } }; template <class Pair> void inner(Pair pair) { typedef typename Pair::first_type Iterator; typedef typename std::iterator_traits<Iterator>::value_type T; Pair p = pair; T *x = &p.first[0]; (void)x; } template<class InIterator> void outer(InIterator begin, InIterator end) { typedef typename std::iterator_traits<InIterator>::value_type ValueType; inner(std::make_pair(begin, end)); } int main(void) { int in[10] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 }; outer( // broken boost::make_transform_iterator(in, plus_two()), boost::make_transform_iterator(in + 10, plus_two())); outer(in, in+10); // working return 0; } == GCC 4.2.0 Output == user@host:~/tmp> gcc-4.2.0 --version gcc-4.2.0 (GCC) 4.2.0 Copyright (C) 2007 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. user@host:~/tmp> gcc-4.2.0 conflict.cpp conflict.cpp: In function 'void inner(Pair) [with Pair = std::pair<boost::transform_iterator<plus_two, int*, boost::use_default, boost::use_default>, boost::transform_iterator<plus_two, int*, boost::use_default, boost::use_default> >]': conflict.cpp:29: instantiated from 'void outer(InIterator, InIterator) [with InIterator = boost::transform_iterator<plus_two, int*, boost::use_default, boost::use_default>]' conflict.cpp:37: instantiated from here conflict.cpp:21: warning: taking address of temporary conflict.cpp:21: error: cannot convert 'boost::detail::operator_brackets_proxy<boost::transform_iterator<plus_t wo, int*, boost::use_default, boost::use_default> >*' to 'int*' in initialization == Intel C++ Compiler Output == user@host:~/tmp> icc -V Intel(R) C Compiler for applications running on Intel(R) 64, Version 10.0 Build 20070613 Package ID: l_cc_c_10.0.025 Copyright (C) 1985-2007 Intel Corporation. All rights reserved. FOR NON-COMMERCIAL USE ONLY user@host:~/tmp> icc conflict.cpp conflict.cpp(21): warning #1563: taking the address of a temporary T *x = &p.first[0]; ^ detected during: instantiation of "void inner(Pair) [with Pair=std::pair<boost::transform_iterator<plus_two, int *, boost::use_default, boost::use_default>, boost::transform_iterator<plus_two, int *, boost::use_default, boost::use_default>>]" at line 29 instantiation of "void outer(InIterator, InIterator) [with InIterator=boost::transform_iterator<plus_two, int *, boost::use_default, boost::use_default>]" at line 35 conflict.cpp(21): error: a value of type "boost::detail::operator_brackets_proxy<boost::transform_iterator<plus_t wo, int *, boost::use_default, boost::use_default>> *" cannot be used to initialize an entity of type "T={int} *" T *x = &p.first[0]; ^ detected during: instantiation of "void inner(Pair) [with Pair=std::pair<boost::transform_iterator<plus_two, int *, boost::use_default, boost::use_default>, boost::transform_iterator<plus_two, int *, boost::use_default, boost::use_default>>]" at line 29 instantiation of "void outer(InIterator, InIterator) [with InIterator=boost::transform_iterator<plus_two, int *, boost::use_default, boost::use_default>]" at line 35 compilation aborted for conflict.cpp (code 2)

2 1

[mpl]problems with mpl::set
by Brian Simpson 19 Jul '07

19 Jul '07

I'm having problems compiling non-explicitly-declared mpl::set types. Here's an example: <block1> typedef set<char> set1_t; BOOST_MPL_ASSERT_RELATION(size<set1_t>::value, ==, 1); //test iterating through the mpl.set: typedef begin<set1_t>::type set1_itr0_t; BOOST_MPL_ASSERT((is_same<deref<set1_itr0_t>::type, char>::type)); typedef next<set1_itr0_t>::type set1_itr1_t; BOOST_MPL_ASSERT((is_same<set1_itr1_t, end<set1_t>::type>::type)); </block1> In block1, I declare a set with one type, char, and then iterate over it. This code compiles, as expected. <block2> typedef set<> empty_set; BOOST_MPL_ASSERT_RELATION(size<empty_set>::value, ==, 0); typedef insert<empty_set, char>::type set2_t; BOOST_MPL_ASSERT_RELATION(size<set2_t>::value, ==, 1); //test iterating through the mpl.set: typedef begin<set2_t>::type set2_itr0_t; BOOST_MPL_ASSERT((is_same<deref<set2_itr0_t>::type, char>::type)); typedef next<set2_itr0_t>::type set2_itr1_t;//compile error at this line BOOST_MPL_ASSERT((is_same<set2_itr1_t, end<set2_t>::type>::type)); </block2> In block2, I declare a set with no types, then insert a char type, then iterate over the resulting sequence. At the line where I get the second iterator, I get a compile error: <error_text> boost\mpl\set\aux_\iterator.hpp(52) : error C3083: 'next_': the symbol to the left of a '::' must be a type boost\mpl\eval_if.hpp(41) : see reference to class template instantiation 'boost::mpl::next<T>' being compiled with [ T=boost::mpl::s_iter<set2_t,boost::mpl::set<boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na>> ] boost\mpl\set\aux_\iterator.hpp(56) : see reference to class template instantiation 'boost::mpl::eval_if<C,F1,F2>' being compiled with [ C=boost::mpl::has_key<set2_t,boost::mpl::set<boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na>::type>, F1=boost::mpl::identity<boost::mpl::s_iter<set2_t,boost::mpl::set<boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na>>>, F2=boost::mpl::next<boost::mpl::s_iter<set2_t,boost::mpl::set<boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na>>> ] source.cpp(120) : see reference to class template instantiation 'boost::mpl::next<T>' being compiled with [ T=set2_itr0_t ] </error_text> MSVS 8.0 is the compiler(_MSC_VER == 1400). Am I missing an obvious error in my code? Thanks! _________________________________________________________________ Need a break? Find your escape route with Live Search Maps. http://maps.live.com/default.aspx?ss=Restaurants~Hotels~Amusement%20Park&cp…

2 4

Finding the correct library to link (feature request for pkg-config support)
by Roger Leigh 19 Jul '07

19 Jul '07

Hi folks, [I've posted this to both user and development lists, because I'm not sure which is most appropriate in this case.] I make use of several Boost libraries in my schroot program (svn://svn.debian.org/svn/buildd-tools/trunk/schroot) This project, like many, utilises GNU Autoconf and Automake for its build system. I need to determine how to link with the Boost libraries in order to build the programs in the project. This is an issue for many projects which want to link with a Boost library. To illustrate my problem: ls -l /usr/lib/libboost_regex-*.so /usr/lib/libboost_program_options-*.so lrwxrwxrwx 1 root root 45 2007-07-08 11:48 /usr/lib/libboost_program_options-gcc41-1_34.so -> libboost_program_options-gcc41-1_34.so.1.34.0 lrwxrwxrwx 1 root root 48 2007-07-08 11:48 /usr/lib/libboost_program_options-gcc41-mt-1_34.so -> libboost_program_options-gcc41-mt-1_34.so.1.34.0 lrwxrwxrwx 1 root root 41 2007-07-08 11:48 /usr/lib/libboost_program_options-mt.so -> libboost_program_options-gcc41-mt-1_34.so lrwxrwxrwx 1 root root 38 2007-07-08 11:48 /usr/lib/libboost_program_options-st.so -> libboost_program_options-gcc41-1_34.so lrwxrwxrwx 1 root root 35 2007-07-08 11:47 /usr/lib/libboost_regex-gcc41-1_34.so -> libboost_regex-gcc41-1_34.so.1.34.0 lrwxrwxrwx 1 root root 38 2007-07-08 11:47 /usr/lib/libboost_regex-gcc41-mt-1_34.so -> libboost_regex-gcc41-mt-1_34.so.1.34.0 lrwxrwxrwx 1 root root 31 2007-07-08 11:47 /usr/lib/libboost_regex-mt.so -> libboost_regex-gcc41-mt-1_34.so lrwxrwxrwx 1 root root 28 2007-07-08 11:47 /usr/lib/libboost_regex-st.so -> libboost_regex-gcc41-1_34.so Unlike every other library on my system, the Boost libraries have the compiler (gcc41) and threading model (mt|st) and so on embedded *in the library name*. This makes it impossible to discover in an automatic fashion. Since this is free software anyone can download and build, I don't know what the compiler/toolchain will be, let alone what abbreviation Boost has chosen for it. I expect that Autoconf will set up such things appropriately. The only means I have are the libboost_program_options-mt.so, libboost_program_options-st.so (and so on for all the libraries) symbolic links which the Debian maintainer has helpfully provided. However, these are not portable, and are so not a good solution. They are, however, the only available solution at the moment. To further show the problem I am having, this is part of my configure.ac Autoconf template: ---configure.ac---- AC_CHECK_HEADERS([tr1/memory]) AC_CHECK_HEADERS([boost/shared_ptr.hpp],, [ if test $ac_cv_header_tr1_memory = yes; then : else AC_MSG_ERROR([Boost.shared_ptr (Boost C++ Libraries) is not installed, but is required by schroot]) fi]) AC_CHECK_HEADERS([tr1/tuple]) AC_CHECK_HEADERS([boost/tuple/tuple.hpp],, [ if test $ac_cv_header_tr1_memory = yes; then : else AC_MSG_ERROR([Boost.Tuple (Boost C++ Libraries) is not installed, but is required by schroot]) fi]) AC_CHECK_HEADERS([boost/format.hpp],, [AC_MSG_ERROR([Boost.Format (Boost C++ Libraries) is not installed, but is required by schroot])]) AC_CHECK_HEADERS([boost/program_options.hpp],, [AC_MSG_ERROR([Boost.Program_options (Boost C++ Libraries) is not installed, but is required by schroot])]) AC_CHECK_HEADERS([boost/type_traits.hpp],, [AC_MSG_ERROR([Boost.TypeTraits (Boost C++ Libraries) is not installed, but is required by schroot])]) AC_MSG_CHECKING([for boost::program_options::variables_map in -lboost_program_options-st]) saved_ldflags="${LDFLAGS}" LDFLAGS="${LDFLAGS} -lboost_program_options-st" AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <boost/program_options.hpp>], [boost::program_options::variables_map::variables_map dummy()])], [AC_MSG_RESULT([yes]) BOOST_LIBS="${BOOST_LIBS} -lboost_program_options-st"], [AC_MSG_RESULT([no]) AC_MSG_FAILURE([libboost_program_options (Boost C++ Libraries) is not installed, but is required by schroot])]) LDFLAGS="${saved_ldflags}" AC_MSG_CHECKING([for boost::program_options::options_description::options() in -lboost_program_options-st]) saved_ldflags="${LDFLAGS}" LDFLAGS="${LDFLAGS} -lboost_program_options-st" AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <boost/program_options.hpp>], [boost::program_options::options_description testgrp("test group"); bool notused = testgrp.options().empty(); ])], [AC_MSG_RESULT([yes]) BOOST_PROGRAM_OPTIONS_DESCRIPTION_METHODS="current"], [AC_MSG_RESULT([no]) BOOST_PROGRAM_OPTIONS_DESCRIPTION_METHODS="old"]) LDFLAGS="${saved_ldflags}" AH_TEMPLATE(BOOST_PROGRAM_OPTIONS_DESCRIPTION_OLD, [Set if boost::program_options::options_description::options() is not available]) if test "$BOOST_PROGRAM_OPTIONS_DESCRIPTION_METHODS" = "old"; then AC_DEFINE(BOOST_PROGRAM_OPTIONS_DESCRIPTION_OLD, 1) fi AC_MSG_CHECKING([for boost::regex in -lboost_regex-st]) saved_ldflags="${LDFLAGS}" LDFLAGS="${LDFLAGS} -lboost_regex-st" AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <boost/regex.hpp>], [boost::regex("^foo[bar]$")])], [AC_MSG_RESULT([yes]) BOOST_LIBS="${BOOST_LIBS} -lboost_regex-st"], [AC_MSG_RESULT([no]) AC_MSG_FAILURE([libboost_regex (Boost C++ Libraries) is not installed, but is required by schroot])]) LDFLAGS="${saved_ldflags}" AC_SUBST([BOOST_LIBS]) ---configure.ac---- As you can see, that's quite a bit of complexity. It also includes code to work around a backwards compatibility issue in Boost.Program_options. However, it needs to know the library name in order to link the test code, and I'm still needing to use a non-standard name in order to do that. It would be great if Boost would provide a mechanism to allow such discovery. Such a mechanism already exists, and is called "pkg-config". By installing a small file in LIBDIR/pkgconfig for each Boost library, the pkg-config tool or PKG_CHECK_MODULES Autoconf macro may be used to query this information. As an example: ---- boost-regex-mt.pc ---- prefix=/usr exec_prefix=${prefix} libdir=${exec_prefix}/lib includedir=${prefix}/include Name: boost-regex-mt Description: Boost C++ Regular Expression Library (multi-threaded) Version: 1.34.0 Libs: -L${libdir} -lboost_regex-gcc41-mt-1_34 Libs.private: -licui18n -licuuc -lrt -lm Cflags: -I${includedir} -pthread ---- boost-regex-mt.pc ---- You can generate this from a template: ---- boost-regex-mt.pc.in ---- prefix=PREFIX exec_prefix=EPREFIX libdir=LIBDIR includedir=INCLUDEDIR Name: boost-regex-mt Description: Boost Regular Expression Library (multi-threaded) Version: VERSION Libs: -L${libdir} LIBRARY_NAME Libs.private: LIBRARY_DEPENDENCIES [for static linking] Cflags: -I${includedir} THREAD_OPTIONS_FOR_COMPILER ---- boost-regex-mt.pc.in ---- where the capitalised names are where you would substitute in the system- and compiler-specific options. It looks like bjam could probably make this a single rule all libraries could make use of. For such a setup, all that configure script above could be mostly reduced to PKG_CHECK_MODULES([boost-regex-st]) PKG_CHECK_MODULES([boost-program-options-st]) I don't know how bjam works, but I do this with Autoconf as a file generated by config.status, but it could also be generated by make with a simple sed command. I guess you could do the bjam equivalent, whatever that might be. I have had a look at the sources to try to implement this, but I am afraid I lack the bjam expertise to do it. You may find much more detailed discussion of these issues at http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=424038 http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=424666 http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=425264 http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=428419 http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=350539 Some of these are due to Debian-specific issues (a change to the symlink name), but the root cause is the inability to identify the Boost library names in an automated fashion. Regards, Roger -- .''`. Roger Leigh : :' : Debian GNU/Linux http://people.debian.org/~rleigh/ `. `' Printing on GNU/Linux? http://gutenprint.sourceforge.net/ `- GPG Public Key: 0x25BFB848 Please GPG sign your mail.

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[Boost.Any] Are there visitors for boost::any?
by Rydinare 19 Jul '07

19 Jul '07

Hi all. I was curious to see if there is or will be support for the use of the visitor pattern with boost::any? I think it would be very useful. I thought I had read that there was an experimental boost::any visitor at some point, but I couldn't find it. Please let me know. Thanks. --------------------------------- Looking for a deal? Find great prices on flights and hotels with Yahoo! FareChase.

3 2

Boost Sockets
by sccr13plyr 19 Jul '07

19 Jul '07

Hello, I am new to Boost. I was looking for socket classes that are a component of Boost. Somehow, I couldn't find any. Are there "boost sockets"? Thanks in advance, Jason

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Re: [Boost-users] Problem with unit test BOOST_AUTO_TEST_MAIN
by Sakharuk, Vlad (GMI Development) 19 Jul '07

19 Jul '07

Yes, if I remove all lib it does run successfully. I identified that tests run from TinyXML lib (opensource). I have to link with other libraries because the code I have to test depends on them. I am just creating tast case to narrow down the problem. I will look in 1.34.o but probably I could not. I will apriceate any solution how to disable particular testing suit (from TinyXML). I could not physically remove those test from the lib. Thanks Vlad -----Original Message----- From: boost-users-bounces(a)lists.boost.org [mailto:boost-users-bounces@lists.boost.org] On Behalf Of Gennadiy Rozental Sent: Thursday, July 05, 2007 11:56 AM To: boost-users(a)lists.boost.org Subject: Re: [Boost-users] Problem with unit test BOOST_AUTO_TEST_MAIN MessageSorry. I missed this post. > "Sakharuk, Vlad (GMI Development)" <Vlad_Sakharuk(a)ml.com> wrote in > message > news:AAA38056FF35DE4CB4A65657784B08FAA9E093@MLNYC730MB.amrs.win.ml.com.. . > Hi all, > > here is my code: > > #define BOOST_AUTO_TEST_MAIN > #include <boost/test/auto_unit_test.hpp> > > BOOST_AUTO_TEST_CASE( test1 ) > { > BOOST_CHECK(true); > } > > > I link it dynamically with boost ver 1.3.3.1 with gcc-3.4.4 on Linux > 2.6. (Note I did not compile this library myself.) > > However there is a lot of other libraries linked to the module but > never > used. > > Bellow is output I am getting. I suspect that other libraries have > embedded boost tests. BUT > 1) There is no test1 in my output. Can you try 1.34.0? If you remove all libs, does it appear? > 2) How I can remove all unnecessary test and stick only to those in my > files only? Why don't you just don't link with other libraries? > > Here is command I have used > > test1 --output_format=XML --log_level=success Gennadiy _______________________________________________ Boost-users mailing list Boost-users(a)lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users -------------------------------------------------------- This message w/attachments (message) may be privileged, confidential or proprietary, and if you are not an intended recipient, please notify the sender, do not use or share it and delete it. Unless specifically indicated, this message is not an offer to sell or a solicitation of any investment products or other financial product or service, an official confirmation of any transaction, or an official statement of Merrill Lynch. Subject to applicable law, Merrill Lynch may monitor, review and retain e-communications (EC) traveling through its networks/systems. The laws of the country of each sender/recipient may impact the handling of EC, and EC may be archived, supervised and produced in countries other than the country in which you are located. This message cannot be guaranteed to be secure or error-free. This message is subject to terms available at the following link: http://www.ml.com/e-communications_terms/. By messaging with Merrill Lynch you consent to the foregoing. --------------------------------------------------------

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unit test examples
by Simon.Parry＠derivativefitch.com 19 Jul '07

19 Jul '07

Hello, Can someone please send me some examples of using the current boost unit test framework - the examples don't appear to be available on the net. thanks Simon Parry ______________________________________________________________________ Confidentiality Notice: The information in this e-mail and any attachment(s) is confidential and for the use of the addressee(s) only. If you have received this e-mail in error, please delete this e-mail. Unauthorized use, reliance, disclosure or copying of the contents of this e-mail, or any similar action, is prohibited. This email has been scanned by the MessageLabs Email Security System. For more information please visit http://www.messagelabs.com/email ______________________________________________________________________

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[Regex] Link error with G++ 3.3.2, but Okay with 3.4.5
by Ambarish Mitra 19 Jul '07

19 Jul '07

Hi all, I have the following code to validate a given url using boost::regex. The code is failing linking with g++ 3.3.2, but is building with 3.4.5 Any workaround, or pointer to help to build in 3.3.2? I am on boost 1.32. All the linking errors are related to std strings. #include <iostream> #include <string> #include <boost/regex.hpp> // Boost.Regex lib using namespace std; int main( ) { std::string url("http://myserver:80/index.html"); boost::regex re; try { boost::regex re("(ftp|http|https):\/\/(\w+\.)*(\w*)\/([\w\d]+\/{0,1})+"); if (!boost::regex_match(url, re)) { throw "Your URL is not formatted correctly!"; } } catch (...) { cerr << "The regexp " << re << " is invalid!" << endl; } } g++ regex2_url.cpp /usr/lib/libboost_regex.a /usr/lib/libboost_regex.a(c_regex_traits.o)(.text+0xab2): In function `boost::re_detail::c_traits_base::set_message_catalogue(std::basic_string<ch ar, std::char_traits<char>, std::allocator<char> > const&)': : undefined reference to `std::basic_string<char, std::char_traits<char>, std::allocator<char> >::_Rep::_S_empty_rep_storage' /usr/lib/libboost_regex.a(c_regex_traits.o)(.text+0xac2): In function `boost::re_detail::c_traits_base::set_message_catalogue(std::basic_string<ch ar, std::char_traits<char>, std::allocator<char> > const&)': : undefined reference to `__gnu_cxx::__exchange_and_add(int volatile*, int)' /usr/lib/libboost_regex.a(c_regex_traits.o)(.text+0xaf6): In function `boost::re_detail::c_traits_base::set_message_catalogue(std::basic_string<ch ar, std::char_traits<char>, std::allocator<char> > const&)': : undefined reference to `std::basic_string<char, std::char_traits<char>, std::allocator<char> >::_Rep::_S_empty_rep_storage' /usr/lib/libboost_regex.a(c_regex_traits.o)(.text+0xb0f): In function `boost::re_detail::c_traits_base::set_message_catalogue(std::basic_string<ch ar, std::char_traits<char>, std::allocator<char> > const&)': : undefined reference to `__gnu_cxx::__exchange_and_add(int volatile*, int)' ... ... DISCLAIMER ========== This e-mail may contain privileged and confidential information which is the property of Persistent Systems Pvt. Ltd. It is intended only for the use of the individual or entity to which it is addressed. If you are not the intended recipient, you are not authorized to read, retain, copy, print, distribute or use this message. If you have received this communication in error, please notify the sender and delete all copies of this message. Persistent Systems Pvt. Ltd. does not accept any liability for virus infected mails.

2 1

[Matrix iterators] Beginner problem
by Regis Behmo 19 Jul '07

19 Jul '07

Hello everyone, I don't understand how to use iterators with matrices; how can I scan all the elements of a matrix? The only thing I have managed to do until now is to read/write the elements of the first row or the first column: ublas::matrix<int> M(3,3); int i = 0; for( ublas::matrix<int>::iterator1 Mit1 = M.begin1(); Mit1 != M.end1(); Mit1++ ) { *Mit1 = i; i++; } Are there such things as row iterators, column iterators, or iterators ocver all the elements of the matrix? Thanks Régis B.

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[program_options] add_options method hangs on Linux
by Farberov, Inga 19 Jul '07

19 Jul '07

Hi, I have a piece of code that runs both on Windows and Linux. I am using program_options library to read a settings file. This seems to work fine on windows, but on Linux the same code hangs when I call add_options method. I am using Boost 1.34 on both machines. Any suggestions on what may be causing this problem are greatly appreciated. Inga

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boost::mpi + boost::shared_ptr
by Andras Joo 19 Jul '07

19 Jul '07

Dear All, I have encountered a problem I cannot go through regarding boost::mpi and shared_ptr. Please consider the following code: class Foo { friend class boost::serialization::access; template<class Archive> void serialize(Archive &ar, const unsigned int version) { //... } }; //... mpi::communicator world; boost::shared_ptr<Foo> pFoo; if (world.rank() == 0) pFoo = boost::shared_ptr<Foo>(new Foo); mpi::broadcast(world, pFoo, 0); //... Now unfortunately this doesn't compile, I get the following error message: /home/jooam/usr/include/boost-1_35/boost/serialization/shared_ptr.hpp: In function 'void boost::serialization::load(Archive&, boost::shared_ptr&, unsigned int) [with Archive = boost::mpi::packed_iarchive, T = Foo]': /home/jooam/usr/include/boost-1_35/boost/serialization/split_free.hpp:58: instantiated from 'static void boost::serialization::free_loader<Archive, T>::invoke(Archive&, T&, unsigned int) [with Archive = boost::mpi::packed_iarchive, T = boost::shared_ptr<Foo>]' /home/jooam/usr/include/boost-1_35/boost/serialization/split_free.hpp:74: instantiated from 'void boost::serialization::split_free(Archive&, T&, unsigned int) [with Archive = boost::mpi::packed_iarchive, T = boost::shared_ptr<Foo>]' /home/jooam/usr/include/boost-1_35/boost/serialization/shared_ptr.hpp:152: instantiated from 'void boost::serialization::serialize(Archive&, boost::shared_ptr&, unsigned int) [with Archive = boost::mpi::packed_iarchive, T = Foo]' /home/jooam/usr/include/boost-1_35/boost/serialization/serialization.hpp:140: instantiated from 'void boost::serialization::serialize_adl(Archive&, T&, unsigned int) [with Archive = boost::mpi::packed_iarchive, T = boost::shared_ptr<Foo>]' /home/jooam/usr/include/boost-1_35/boost/archive/detail/iserializer.hpp:161: instantiated from 'void boost::archive::detail::iserializer<Archive, T>::load_object_data(boost::archive::detail::basic_iarchive&, void*, unsigned int) const [with Archive = boost::mpi::packed_iarchive, T = boost::shared_ptr<Foo>]' /home/jooam/evolearn/src/evolearn.cpp:75: instantiated from here /home/jooam/usr/include/boost-1_35/boost/serialization/shared_ptr.hpp:137: error: 'class boost::mpi::packed_iarchive' has no member named 'reset' Could you tell me please, what I'm doing wrong? I would appreciate any help. Have a nice day, Andras ____________________________________________________________________________________ Don't get soaked. Take a quick peak at the forecast with the Yahoo! Search weather shortcut. http://tools.search.yahoo.com/shortcuts/#loc_weather

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[python] unresolved docstring_options symbols with 1.34.0 using msvc 8 and 9
by Johan Johansson 19 Jul '07

19 Jul '07

Hi I'm having some problems moving from boost 1.33.1 to 1.34.0. More specifically my python extension isn't linking anymore: > Searching W:\boost_1_34_0\stage\lib\boost_python-vc80-mt.lib: >Finished searching libraries >MagicMarker.obj : error LNK2001: unresolved external symbol "private: >static bool volatile boost::python::docstring_options::show_user_defined_" >(?show_user_defined_@docstring_options@python@boost@@0_NC) >MagicMarker.obj : error LNK2001: unresolved external symbol "private: >static bool volatile boost::python::docstring_options::show_signatures_" >(?show_signatures_@docstring_options@python@boost@@0_NC) That seems to be statistics however: W:\boost_1_34_0\bin.v2\libs\python\build\msvc-8.0\debug>dumpbin /symbols function.obj | findstr docstring ... 1B4 00000004 SECT7 notype External | ?show_user_defined_@docstring_options@python@boost@@0_NC (private: static bool volatile boost::python::docstring_options::show_user_defined_) 1B5 00000005 SECT7 notype External | ?show_signatures_@docstring_options@python@boost@@0_NC (private: static bool volatile boost::python::docstring_options::show_signatures_) ... W:\boost_1_34_0\stage\lib>dumpbin /exports boost_python-vc80-mt.lib | findstr docstring_options ... ?show_signatures_@docstring_options@python@boost@@0_NC (private: static bool volatile boost::python::docstring_options::show_signatures_) ?show_user_defined_@docstring_options@python@boost@@0_NC (private: static bool volatile boost::python::docstring_options::show_user_defined_) ... Any ideas? j

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boost::mpi + serialization of polimorphic pointers
by Andras Joo 19 Jul '07

19 Jul '07

Dear All, I'm facing the following problem. I have the following class hierarchy: AbstractBase <--- AbstractDerived <---- ConcreteDerived I managed to make the serialization of AbstractBase using text and binary archives (text_[i/o]archive, binary_[i/o]archive), tested, and works fine. However when AbstractBase pointers are sent with MPI functions a runtime exception occurs: /usr/include/boost-1_35/boost/archive/detail/oserializer.hpp:413: static void boost::archive::detail::save_pointer_type<Archive, TPtr>::polymorphic<T>::save(Archive&, const T&, const boost::archive::detail::basic_pointer_oserializer*) [with T = AbstractBase, Archive = boost::mpi::packed_oarchive, TPtr = AbstractBase*]: Assertion `__null != bpos_ptr' failed. I appreciate any help. Thank you, and have a nice weekend. Andras ____________________________________________________________________________________ Moody friends. Drama queens. Your life? Nope! - their life, your story. Play Sims Stories at Yahoo! Games. http://sims.yahoo.com/

2 1

scoped_ptr, shared_ptr and pimpl
by Noah Roberts 19 Jul '07

19 Jul '07

I have an object that uses scoped_ptr to point to it's impl...an incomplete type forward declared in the header and implemented in the cpp file. This object *does have a user defined destructor*! This user defined destructor is defined after the opaque type has been fully defined in the same cpp file. In another cpp file I have a function that lives in the same namespace as the object in question, which creates a shared_ptr to this object. I'm getting the "undefined type" error in checked_delete for the impl object. I've run into this problem before but it was because I did not have a user defined destructor for the outer object...now I do. I even created a blank destructor for the impl, something I've never had to do before. What gives? Any ideas where to look for the problem? My simplest program that exhibits the problem doesn't exhibit the problem...I find this frustrating.

2 2

Question about from_time_t implementation
by Gerardo Lamastra 18 Jul '07

18 Jul '07

Hello everybody, I've seen that boost::posix_time supports a conversion function time_t from_time_t(ptime t) I've also seen on the mailing list, that something related to this issue has already been discussed. However, I've not found enough information (browsing ML and bug support) to understand if this issue is considered closed, or if anyone has never run into similar problems: We're using this function, and a counterpart ptime to_time_t(time_t) function because our application interacts with a MySQL db where date information is stored as unix timestamp. While processing the data, we run in a problem (I won't say 'bug') because MySQL and boost give different meaning to unix timestamp. For example, timestamp 1184795149 is 2007-Jul-18 23:45:49 (local time) for MySQL and it is 2007-Jul-18 21:45:49 (local time) for boost. The correct value is the first one. My current timezone offset is 2 hours, so you can see that we are missing UTC here. Checking the code, I've seen that the function basically converts by adding the number of second to 1/1/1970 0:0:0; however, it should be 1/1/1970 0:0:0 UTC, which is not. Jeff Garland touches this issue in this post: http://aspn.activestate.com/ASPN/Mail/Message/1758411 where he encourages C++ developer to move away from the time_t interface; however, often, for legacy reason, this may not be possible (as in our application). In order to comply with other implementation, we suggest to modify the function as follows: // The Boost Actual Implementation ptime boost_from_time_t(std::time_t t) { ptime start(boost::gregorian::date(1970,1,1)); return start + seconds(static_cast<long>(t)); } // Our 'old' function, written to match the previous one time_t boost_to_time_t(ptime t) { static const ptime THE_EPOCH(boost::gregorian::date(1970,1,1)); return time_period(THE_EPOCH, t).length().total_seconds(); } // The implementations that takes into account UTC ptime my_from_time_t(std::time_t t) { static const time_duration OFFSET = second_clock::local_time() - second_clock::universal_time(); static const ptime THE_EPOCH(boost::gregorian::date(1970,1,1), OFFSET); return THE_EPOCH + seconds(static_cast<long>(t)); } time_t my_to_time_t(ptime t) { static const time_duration OFFSET = second_clock::local_time() - second_clock::universal_time(); static const ptime THE_EPOCH(boost::gregorian::date(1970,1,1), OFFSET); return time_period(THE_EPOCH, t).length().total_seconds(); } That's all. Thanks a lot for any response. -Gerardo -------------------------------------------------------------------- CONFIDENTIALITY NOTICE This message and its attachments are addressed solely to the persons above and may contain confidential information. If you have received the message in error, be informed that any use of the content hereof is prohibited. Please return it immediately to the sender and delete the message. Should you have any questions, please contact us by replying to webmaster(a)telecomitalia.it. Thank you www.telecomitalia.it --------------------------------------------------------------------

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