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Boost Interval Arithmetic Library: msvc_rounding_control.hpp broken in 64 bit msvc?
by Iman Brouwer 26 Apr '10

26 Apr '10

Hello, When using the boost interval library we get a run-time assertion failure in debug with 64 bit Visual Studio 2005 and up. In file msvc_rounding_control.hpp, the function set_rounding_mode(..) calls _control87(..) which in debug will cause an assert to fail. According to microsoft documentation: "On the x64 architecture, changing the floating-point precision is not supported. If the precision control mask is used on that platform, the invalid parameter handler is invoked, as described in Parameter Validation." Run-time library reference: http://msdn.microsoft.com/en-us/library/e9b52ceh%28VS.80%29.aspx Visual Studio 2010 documentation: http://msdn.microsoft.com/en-us/library/c9676k6h.aspx In release the invalid parameter handler is not invoked so the code runs without complaining, but the rounding-mode is of course not changed. Did anybody else run into this problem? Iman

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[filesystem] remove_filename( ) - is this an error?
by Robert Jones 26 Apr '10

26 Apr '10

Hi Guys This bit of code... #include <iostream> #include <boost/filesystem.hpp> int main( ) { const char * bits[] = { "first", "second", "third", "fourth", 0 }; boost::filesystem::path path; for ( const char * * bit = bits; * bit; ++ bit ) { path /= * bit; } while ( path.has_parent_path( ) ) { std::cout << path << std::endl; path.remove_filename( ); } } produces first/second/third/fourth first/second/third/ first/second/third first/second/ first/second first/ which surprised me, as the documentation says basic_path& remove_filename(); *Effects:* If has_parent_path() then remove the last *filename* from the stored path. If that leaves the stored path with one or more trailing *slash * elements not representing *root-directory*, remove them. Seems to me that remove_filename() does NOT remove trailing slashes as stated. - Rob.

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Boost.Function __stdcall, __fastcall, etc
by Brian Rowlett 26 Apr '10

26 Apr '10

I am writing a DLL that gets injected into another process, and creates pointers to the target processes functions. The target process uses all 3 calling conventions, __stdcall, __fastcall and __cdecl. I have created a class whos constructor gets the address of the function, and passes it to the base class boost::function: > template <typename _Signature, enum LibraryId _LibraryId, int _Offset> > class FunctionPointer: protected OffsetPointer, public > boost::function<_Signature> > { > public: > FunctionPointer(void) > : boost::function<_Signature>( OffsetPointer::_getOffset(_LibraryId, > _Offset ) > { return; } > }; > I instantiate this with: > FunctionPointer<return_type__stdcall( argument_types ), LibraryId, Offset> > Function; FunctionPointer<return_type __cdecl( argument_types ), LibraryId, Offset> > Function; Whatever calling convention Visual Studio is setup to use (__cdecl by default), works just fine. But trying to instantiate it with another calling convention gives the following error: > Error 1 error C2504: 'boost::function<Signature>' : base class undefined It seems weird that it would work for some calling conventions, and not others.. Any ideas? -- + Brian J. Rowlett

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[MPL] Proposal for runtime_contains_if algorithm submission
by Eldar Kononov 26 Apr '10

26 Apr '10

Hello everyone. Currently only one runtime algorithm is available in MPL: for_each. I suggest to add another one: runtime_contains_if. The problem is searching through the sequence of types and find that one which satisfies some runtime predicate. Sample task: Given some base abstract class: struct base { virtual ~base(){} }; The implementation of the base could be one of the following classes: struct child1 : public base {}; struct child2 : public base {}; struct child3 : public base {}; struct child4 : public base {}; struct child5 : public base {}; Now suppose you have "base* b" and you need to find out if its concrete type is either child3 or child4 (in practise the set of types to check could be larger). I propose the following solution: 1. You write a predicate similar to STL contains_if but with template type in operator(). The concept is the same as in boost::mpl::for_each. struct child_detector { base* base_; child_detector( base* b ) : base_( b ) {} template< typename Derived_ > bool operator()( Derived_* ) { return ( 0 != dynamic_cast< Derived_* >( base_ ) ); } }; 2. You use boost::mpl::runtime_contains_if algorithm: bool type_is_special( base* b ) { typedef boost::mpl::list< child3, child4 > special_types; return boost::mpl::runtime_contains_if< special_types >( child_detector(b) ); } The implementation of the boost::mpl::runtime_contains_if is in attached runtime_contains_if.hpp. Complete example is in attached runtime_contains_if_example.cpp.

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[Install] Am I doing something silly....?
by Robert Jones 26 Apr '10

26 Apr '10

Hi Guys Despite having used Boost for quite while I'm doing my first install of Boost on a Linux box and don't seem to be getting it right! This should be straight forward, using all the defaults. Specifically this is Fedora 11 (64-bit), with gcc 4.4.1 and Boost 1.42, and I don't have write permission for /usr/local, so... > ./bootstrap.sh --prefix=/home/rjones/thirdparty/boost/boost_1_42_0 .... > ./bjam install 2>&1 | tee bjam.log There's A LOT of noise, lots of warnings, some errors, and finally cp: cannot create regular file `/usr/local/lib/libboost_wave.a': Permission denied cp "bin.v2/libs/wave/build/gcc-4.4.1/release/link-static/threading-multi/libboost_wave.a" "/usr/local/lib/libboost_wave.a" ...failed common.copy /usr/local/lib/libboost_wave.a... ...failed updating 98 targets... ...skipped 7732 targets... ...updated 674 targets... I've attached the logfile begin and end (it's huge!). Can anyone tell me what I'm doing wrong. Thanks, Rob.

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Compiling specific modules
by Samuel Williams 26 Apr '10

26 Apr '10

Dear Friends, I'm sorry if this is a stupid question... however, I want to compile boost but only specific parts of it. Is this possible? I'm already using --build-type=minimal - but I want to compile libraries for exactly what I'm using so it doesn't take so long for cross platform compilation. Is there some documentation somewhere? Thanks, Samuel

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[1.43.0] Beta 1 now available from SourceForge
by Beman Dawes 25 Apr '10

25 Apr '10

Boost release 1.43.0 beta 1 is now available from SourceForge See http://sourceforge.net/projects/boost/files/ For details of what's in the release, see http://beta.boost.org/users/news/version_1_43_0. Note that the links to files on this web page are for the final release - use the SourceForge link above to get the beta files. There are known issues with GCC 4.5 and VC++ 2010. These compilers were released a few weeks ago so support is still rough around the edges. Some fixes will make it into the final 1.43.0 release, but full support will not be available until 1.44.0. Please download the beta, give it a try, and report any problems you encounter here. -- The Boost Release Team

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[BGL] Examples missing in the documentation
by Hossein Haeri 25 Apr '10

25 Apr '10

Dear all, I have noticed that the following two examples have are missing in the BGL online documentation: example/exterior_edge_properties.cpp example/bellman_ford.cpp (I spotted these in the following page: http://www.boost.org/doc/libs/1_42_0/libs/graph/doc/using_property_maps.html) Strangely enough, they apparently don't exist in the entire Boost website either (Google doesn't find them). Nor are they part of the 1.42 pack. Am I missing anything? TTFN, --Hossein

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phoenix function problem
by Olaf Peter 24 Apr '10

24 Apr '10

Hi, in the example attached, the 1st test case fails on runtime: test_phoenix_fcn.cpp(105): test 'at_c<0>( rlc ) && at_c<1>( rlc ) && at_c<2>( rlc )' failed in function 'int main(int, char**)' test_phoenix_fcn: /home/olaf/Projects/programming/cpp/boost/trunk/boost/optional/optional.hpp:591: typename boost::optional_detail::optional_base<T>::reference_type boost::optional<T>::get() [with T = double]: Assertion `this->is_initialized()' failed. Aborted the 2nd (with defined WANT_TO_HAVE) doesn't compile. This is the goal. Where is my misunderstanding here? To to get it working correctly? Thanks, Olaf

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Boost.Fusion compilation error gcc 4.4.3 in boost/fusion/include/make_unfused_generic.hpp
by Theo de Vries 24 Apr '10

24 Apr '10

I have an up-to-date Archlinux system with a standard gcc 4.4.3. I wish to use a library that in turn uses Boost.Fusion. I get compilation errors for Boost.Fusion 1.41 and 1.42 (version 1.40 and 1.37 are ok). Simple test program to reproduce: #include <boost/fusion/include/make_unfused_generic.hpp> #include <iostream> int main() { std::cout << "Hello world"; } The first error that I get is: boost/fusion/functional/adapter/unfused_generic.hpp:54 error: a function call cannot appear in a constant-expression boost/fusion/functional/adapter/unfused_generic.hpp:54 error: template argument 1 is invalid Google has not helped me to resolve my problems. Any help is greatly appreciated. Theo.

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shared_ptr
by mh00219＠surrey.ac.uk 23 Apr '10

23 Apr '10

Hello Please tell me how can base class pointer be assigned to derived class pointer? are they both same? if they then how? Please reply must. regrads Hammad

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Re: [Boost-users] Boost graph write_graphml
by Overmind DL1 23 Apr '10

23 Apr '10

On Fri, 23 Apr 2010, Theodore McCormack wrote: > I am having troubles figuring out how to use write_graphml from the > documentation. My problem is in creating the dynamic_property.ï¿œTo access > my vertex properties i use this:ï¿œ > > VERTEXPROPERTIES& properties(const Vertex& v) > { > typename property_map<GraphContainer, vertex_properties_t>::type param = get(vertex_properties, graph); > return param[v]; > } > whereï¿œVERTEXPROPERTIES is a type of a structure that i use for vertex properties. > > how would i go about creating a dynamic_property from that property map? dynamic_properties dp; dp.property("properties", param); A more complete example is at <URL:http://www.boost.org/doc/libs/1_42_0/libs/graph/doc/write_graphml.html>. Note that if you would like separate names for the different properties you will need to define separate property names and add an entry to dp for each; property maps can be created using a function call on an existing property map, though, so you would not need to rearrange your graph data structures. Are you using bundled properties by any chance? Or do you really have a single struct that has all of your properties but is not used as a bundle? -- Jeremiah Willcock

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Re: [Boost-users] Troubleshooing deadlock with upgrade_lock<shared_mutex>
by Ken Smith 23 Apr '10

23 Apr '10

Hmmm . . . actually, as I've been poking around, I think I've I found some more explanations elsewhere which, if I'm understanding them correctly, indicate that (a) I've misunderstood what an upgrade_lock does, but also that (b) my code shouldn't be subject to* *the deadlocks you're describing (though it's clearly susceptible to others :-). The key (which isn't clearly noted in the documentation) is that an upgrade_lock is like a unique_lock in that only one upgrade_lock can be held at a time. (I was thinking it was more like a shared_lock, in that multiple instances of it could be held at the same time, but Anthony Williams indicates that's not the case: http://groups.google.mv/group/boost-list/msg/2c93110e9e3dbb45.) This means that the behavior in my code could go something like: - transmit() acquires shared_lock. - createRoom() acquires upgrade_lock. - deleteRoom() attempts to acquire upgrade_lock and blocks (because of the upgrade_lock held by createRoom()). - createRoom() attempts to upgrade to a unique_lock and blocks (because of the shared_lock held by transmit()). - transmit() releases shared_lock. - createRoom() successfully upgrades to a unique_lock. (deleteRoom() is still blocked because createRoom() already has an upgrade_lock) - transmit() attempts to acquire shared_lock and blocks. - createRoom() releases unique lock. - deleteRoom() successfully acquires upgrade_lock. - transmit() successfully acquires shared_lock. - life goes on Now, if transmit() were regularly taking longer than 20 ms to complete, so that it was regularly being called reentrantly, I could imagine that it would build up a pretty good backlog of shared locks, which would prevent createRoom() and deleteRoom() from acquiring their *unique* locks. But if I'm understanding this correctly, I can't think of a scenario that would result in the behavior I'm seeing, i.e., both the createRoom() and deleteRoom() methods blocking each other while attempting to acquire an upgrade_lock. (Since no other unique or upgrade locks appear to be held elsewhere at the time.) That said, I'm reasonably new to multithreading, and I'm still having to think through these issues, so I might be missing something. (Actually, I clearly am, I'm just trying to figure out what it is :-). Ken Smith Cell: 425-443-2359 Email: smithkl42(a)gmail.com Blog: http://blog.wouldbetheologian.com/ On Fri, Apr 23, 2010 at 11:42 AM, Frank Mori Hess <frank.hess(a)nist.gov>wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > On Friday 23 April 2010, Ken Smith wrote: > > On Fri, Apr 23, 2010 at 10:57 AM, Frank Mori Hess > > > Yes, they are deadlocked because both upgrade locks are waiting for the > > other to release shared ownership so they can upgrade to unique > ownership. > > > > Perhaps I wasn't clear. They're not waiting on the > upgrade_to_unique_lock > > lines, but on the upgrade_lock lines. > > Despite my initial misunderstanding, your code still appears to be > vulnerable > to the deadlock I described, even if that isn't what you are hitting at the > moment. > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v1.4.9 (GNU/Linux) > > iEYEARECAAYFAkvR6i0ACgkQ5vihyNWuA4VNfQCfevtL72DQKITwIm8TaH3hk6z5 > TDAAnRyjfQVEitRqrlWtkzl/62EiG8Dc > =+p2O > -----END PGP SIGNATURE----- >

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Troubleshooing deadlock with upgrade_lock<shared_mutex>
by Ken Smith 23 Apr '10

23 Apr '10

I'm a C++/boost newbie, so my apologies if this is a basic question. I've got a multithreaded app that appears to be deadlocking when two threads are trying to acquire an upgrade_lock<shared_mutex> at the same time. Specifically, I've got a class that looks something like this: #include <boost/thread.hpp> using namespace boost; class Manager { public: Manager(); ~Manager(); void createRoom(); void deleteRoom(); void transmit(); private: shared_mutex roomManagersMutex; }; void Manager::createRoom() { upgrade_lock<shared_mutex> upgradeLock(roomManagersMutex); // Read stuff if(roomShouldBeCreated) { upgrade_to_unique_lock<shared_mutex> uniqueLock(upgradeLock); // Create room } } void Manager::deleteRoom() { upgrade_lock<shared_mutex> upgradeLock(roomManagersMutex); // Read stuff if (roomShouldBeDeleted) { upgrade_to_unique_lock<shared_mutex> uniqueLock(upgradeLock); // Delete the room } } void Manager::transmit() { shared_lock<shared_mutex> lock(roomManagersMutex); // Read stuff about the room } The Manager::deleteRoom() and Manager::createRoom() methods are typically only called once every few seconds, but Manager::transmit() is called every 20 milliseconds or so, i.e., about 50 times / second. Periodically, the app stops responding. When it does, I can see that the transmit() method is working fine, but the createRoom() and deleteRoom() methods (on separate threads, obviously) appear to be deadlocked on the highlighted lines, waiting to acquire their upgrade_locks. Now that seems weird to me, because I thought the whole purpose of the upgrade locks was that they're supposed to be shared, right up until you request an upgrade to a unique lock. Obviously the code is more complex than what I've described, but it doesn't appear that there's a unique lock being held anywhere when the deadlock happens. Am I doing something wrong? Any suggestions on troubleshooting this? Ken Smith Cell: 425-443-2359 Email: smithkl42(a)gmail.com Blog: http://blog.wouldbetheologian.com/

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tuple
by luca formaggia 23 Apr '10

23 Apr '10

Hello, someone could tell me what is wrong in this piece of code #include "boost/tuple/tuple.hpp" using namespace boost::tuples; int main(){ tuple<int, double> t2(); get<0>(t2)=int(10); } I get the following error message: g++ try.cpp try.cpp: In function ‘int main()’: try.cpp:5: error: no matching function for call to ‘get(boost::tuples::tuple<int, double, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type> (&)()) In the tutorial it is written that tuple<int, double> t2() should construct the object via the default constructor. Why I cannot access the first element (it works if I give an initial value, for instance using tuple<int, double> t2(1); I get a similar error if I use the method get<N>() instead of the function. I am using gnu compiler gcc version 4.4.1 (GCC) in a i386 linux machine. Thank you, Luca -- Luca Formaggia

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Boost graph write_graphml
by Theodore McCormack 23 Apr '10

23 Apr '10

I am having troubles figuring out how to use write_graphml from the documentation. My problem is in creating the dynamic_property. To access my vertex properties i use this: VERTEXPROPERTIES& properties(const Vertex& v) { typename property_map<GraphContainer, vertex_properties_t>::type param = get(vertex_properties, graph); return param[v]; } where VERTEXPROPERTIES is a type of a structure that i use for vertex properties. how would i go about creating a dynamic_property from that property map? Regards! Ted

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Writing a function to use a generic random number generator
by Joseph Wakeling 23 Apr '10

23 Apr '10

Hello all, A question regarding Boost's random number generators. Here's a simple example use-case: ///////////////////////////////////////////////////////// #include <iostream> #include <vector> #include <boost/foreach.hpp> #include <boost/random.hpp> using namespace std; using namespace boost; void generate_random_numbers(vector<double> &x, mt19937 &rng) { BOOST_FOREACH(double &z, x) z = uniform_real<double> (0.0, 5.0) (rng); } int main() { mt19937 rng; vector<double> x; x.resize(1000); generate_random_numbers(x,rng); for(size_t i=0;i!=10;++i) cout << x.at(i) << endl; // and now do something fun with x ... :-) return 0; } ///////////////////////////////////////////////////////// The question is, how do I go about getting generate_random_numbers() to use an _arbitrary_ random number generator instead of having to be mt19937? In particular, is there a way to do this without needing to have a template function? Thanks & best wishes, -- Joe

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Matrix Deallocation
by Marco Arena 23 Apr '10

23 Apr '10

Hi, I'm new of Boost! I'd like to deallocate a ublas::compressed_matrix. For example: typedef boost::numeric::ublas::compressed_matrix<double> Matrix; Matrix m = Matrix(10,10,5); // operations... // Deallocation Thanks and sorry if the question is too trivial. Best regards, Marco

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Returning by value, was: [Range] non-const range reference
by Robert Jones 23 Apr '10

23 Apr '10

On Fri, Apr 23, 2010 at 9:51 AM, Neil Groves <neil(a)grovescomputing.com>wrote: > > On Thu, Apr 22, 2010 at 11:43 AM, Robert Jones <robertgbjones(a)gmail.com>wrote: > > >> Returning containers by value seems to be the 'right way' now, as RVO >> should >> sort out the copy elision. >> >> > I'm not convinced that this is the 'right way'. I find that for trivial > examples the copy is optimized away, but that on many compilers at various > levels of call depth the copy construction occurs causing a huge performance > degradation. I suspect that the 'right way' is still by using references in > C++03 and by using move constructors in C++0x. > > > This is concerning - anybody else have any experience to support this? My original remark was prompted by http://cpp-next.com/archive/2009/08/want-speed-pass-by-value/ penned by Dave A. If compilers don't really do this consistently I need to write my code rather differently by default! - Rob.

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[Range] non-const range reference
by Robert Jones 23 Apr '10

23 Apr '10

I'm not able to use the latest Boost release, so I've plagarised some little bits that are useful, and in the process might have missed something, so bear with me. I have this bit of code... #include <algorithm> #include <boost/range.hpp> template < class SinglePassRange, class UnaryFunction > UnaryFunction for_each( SinglePassRange & rng, UnaryFunction fun ) { return std::for_each( boost::begin( rng ), boost::end( rng ), fun ); } struct A { }; void f( const A & ); std::vector< A > generateVec( ); int main( ) { for_each( generateVec( ), f ); } which understandably fails to compile as I'm passing an lvalue as non-const reference. I can fix this by adding a const ref overload of for_each, but no such overload exists in the real boost range header (AFAIK). Returning containers by value seems to be the 'right way' now, as RVO should sort out the copy elision. What I'm doing in this code seems reasonable - should it be supported by const ref overloads, or have I missed some 'gotcha' somewhere? Thanks, - Rob.

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[program options] option_description name as string
by Anthony Foglia 22 Apr '10

22 Apr '10

We tend to store the names of our options in strings (so we can reuse them later when getting the values out of the variable map). But option_descriptions can only be created from const char *, so we need to add a .c_str() when building the options_description. Is there any reason why options can't be constructed with a string? Otherwise I'll open a feature request bug. -- Anthony Foglia Princeton Consultants (609) 987-8787 x233

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time_t to ptime conversion problem
by Scott Vanderweyst 22 Apr '10

22 Apr '10

While doing some testing I've come across what I consider a bug in the boost::posix::from_time_t function. I'm running this on Visual studio 2005 due to needing to deal with some legacy code. I'm using boost v 1.39 - Issue is that if you create a time_t representing a date after Jan 18 2038 using standard functions, when the time_t is loaded into the ptime it's rolling back to 1901. In Visual studio 2005, time_t is 64 bit. Example code: #include <boost/date_time/posix_time/posix_time.hpp> #include <boost/date_time/posix_time/time_parsers.hpp> int main() { struct tm timeStruct; boost::posix_time::ptime boostTime; time_t timeVal; memset(&timeStruct, 0, sizeof(timeStruct)); timeStruct.tm_year = 138; timeStruct.tm_mon = 0; timeStruct.tm_mday = 18; timeVal = mktime(&timeStruct); std::cout << timeVal << std::endl; boostTime = boost::posix_time::from_time_t(timeVal); std::cout << boostTime << std::endl; memset(&timeStruct, 0, sizeof(timeStruct)); timeStruct.tm_year = 138; timeStruct.tm_mon = 0; timeStruct.tm_mday = 19; timeVal = mktime(&timeStruct); std::cout << timeVal << std::endl; boostTime = boost::posix_time::from_time_t(timeVal); std::cout << boostTime << std::endl; return 0; } which outputs: 2147403600 2038-Jan-18 05:00:00 2147490000 1901-Dec-13 22:31:44 which is not quite the result I was hoping for. Any suggestions other than not using time_t? ( It's been considered and rejected as a possibility for now) Thanks in advance Scott V

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problem in porting my application to 1.42.0
by Mahmood Naderan 22 Apr '10

22 Apr '10

My project works fine with Boost 1.33.1 but when I want to make it with boost 1.42.0 I get several errors. In file included from /home/mahmood/boost_1_42_0/boost/multi_index_container_fwd.hpp:18, from /home/mahmood/boost_1_42_0/boost/multi_index_container.hpp:30, from BaseCacheControllerImpl.cpp:61: /home/mahmood/boost_1_42_0/boost/multi_index/indexed_by.hpp:61: error: wrong number of template arguments (50, should be 20) /home/mahmood/boost_1_42_0/boost/mpl/aux_/preprocessed/gcc/vector.hpp:22: error: provided for ‘template<class T0, class T1, class T2, class T3, class T4, class T5, class T6, class T7, class T8, class T9, class T10, class T11, class T12, class T13, class T14, class T15, class T16, class T17, class T18, class T19> struct boost::mpl::vector’ In file included from /home/mahmood/boost_1_42_0/boost/multi_index/detail/ord_index_args.hpp:21, from /home/mahmood/boost_1_42_0/boost/multi_index/ordered_index_fwd.hpp:16, from /home/mahmood/boost_1_42_0/boost/multi_index_container_fwd.hpp:19, from /home/mahmood/boost_1_42_0/boost/multi_index_container.hpp:30, from BaseCacheControllerImpl.cpp:61: /home/mahmood/boost_1_42_0/boost/multi_index/tag.hpp:79: error: wrong number of template arguments (50, should be 20) /home/mahmood/boost_1_42_0/boost/mpl/aux_/preprocessed/gcc/vector.hpp:22: error: provided for ‘template<class T0, class T1, class T2, class T3, class T4, class T5, class T6, class T7, class T8, class T9, class T10, class T11, class T12, class T13, class T14, class T15, class T16, class T17, class T18, class T19> struct boost::mpl::vector’ /home/mahmood/boost_1_42_0/boost/multi_index/tag.hpp:81: error: template argument 1 is invalid What happend to the indexed_by.hpp from 1.33.1 to 1.42.0. All ideas are welcomed. // Naderan *Mahmood;

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Unicode Problem
by green beret 22 Apr '10

22 Apr '10

Ive written a small function to copy a directory from one dir to another When I run this on one Fedora 12 machine, it works fine, even for chinese files and folders. however, when i run this on Fedora 12 on another machine, it gives me Boost::filesystem::copy_file: Invalid Argument: "/mnt/pd1/??Microsoft Word ??.doc"."/mnt/pd/??Microsoft Word ??.doc" Why? is the machine missing any package? Please help Here is the code: #include <iostream> #include <boost/filesystem.hpp> #include <cstdio> #include <string> using namespace std; struct dir { int file_count; int total_size; }; void copy_dir(string src, string dest); int main() { copy_dir("/media/disk", "/media/disk-1"); return 0; } void copy_dir(string src, string dest) { boost::filesystem::path psrc(src); boost::filesystem::path pdest(dest); if(!boost::filesystem::is_directory(psrc) || !boost::filesystem::is_directory(pdest)) { cerr<<" Source and Destination are not directories "<<endl; } for(boost::filesystem::directory_iterator i(psrc); i!=boost::filesystem::directory_iterator(); ++i) { boost::filesystem::path from(*i); string to_path=pdest.string() + "/" + i->leaf(); boost::filesystem::path to(to_path); if(is_regular(from) && !boost::filesystem::exists(to) ) { cerr<<"Copying "<<from.string()<<" to "<<to.string()<<endl; copy_file(from,to); } else if(is_directory(from) ) { if(!exists(to)) create_directory(to); copy_dir(from.string(), to_path); } } } Thanks...

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[GIL] Important fix
by Eloi Du Bois 22 Apr '10

22 Apr '10

I Christian and Lubomir, I am wondering if the two patchs I have made (which correct an important bug) will be on the boost_1.43 version. There is only a couple of lines to correct, but they are really important. I really hope you can do so, because it is critical for me (and other people who wants to work with exotic views). Thank you in advance, Eloi.

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Spirit Newbie (balanced parentheses)
by EricB 21 Apr '10

21 Apr '10

Hi all I'm trying to use spirit in order to make a parser for a simple language. Last time i had to do this I was in school (some more than 15 years ago). I managed to do something that works but it does not handle "balanced parentheses". I know this is a common problem but after having look for every possible way of spelling "balanced parentheses" I did not find anything (that I could understand). The files I want to parse are made of ASCII char. They can contains commands that should be interpreted (replacement). Commands always start with "^!" (command switch). An example of a file content: text text text ^!for-each( A )( B ) text text text text I want to send the "text" strings to the std::cout and detect the commands "^!for-each( A )( B )" in order to process them. At the moment I only have one command "for-each" Where: A : is a query that can contain /'" and balanced () B : is the text to be sent to output for each result of the query. This can be a 'script' meaning text + commands, for example: aa bb ^!for-each(C)(D) tt yy uu therefore B can also contain balanced (). The rules, I wrote does not handled balanced () very well. For example the following command should be parsed successfully: ^!for-each( a/b/c()/e[]/d ) ( item [name] do ^!for-each(sub/text()) ( print() ) ) I need some advices. Thank you So here are my rules { boost::spirit::chlit<> LPAREN('('); boost::spirit::chlit<> RPAREN(')'); boost::spirit::strlit<> CMDSWITCH("^!"); script // main rule = * ( (boost::spirit::anychar_p - CMDSWITCH) | command ); command = boost::spirit::discard_first_node_d[ CMDSWITCH >> (for_each | boost::spirit::eps_p // for error reporting ) ]; for_each = boost::spirit::discard_first_node_d[ boost::spirit::as_lower_d["for-each"] >> *boost::spirit::space_p >> query >> *boost::spirit::space_p >> subscript ]; query = boost::spirit::inner_node_d[ LPAREN >> *(boost::spirit::anychar_p - ( RPAREN )) >> RPAREN ]; subscript = boost::spirit::inner_node_d[ LPAREN >> *( (boost::spirit::anychar_p - ( CMDSWITCH | RPAREN )) |command ) >> RPAREN ]; }

4 12

Re: [Boost-users] still stuck on expectation points
by Overmind DL1 21 Apr '10

21 Apr '10

-----Original Message----- From: philip tucker <phhht(a)earthlink.net> Sent: Tuesday, April 20, 2010 4:44 PM To: boost-users(a)lists.boost.org <boost-users(a)lists.boost.org> Subject: Re: [Boost-users] still stuck on expectation points On 16 Apr 2010, at 6:52 PM, OvermindDL1 wrote: > On Fri, Apr 16, 2010 at 7:47 PM, philip tucker > <phhht(a)earthlink.net> wrote: > >> >> On 16 Apr 2010, at 6:16 PM, OvermindDL1 wrote: >> >> >>> >>> start %= (constitkind >> (id > ':' > id) >> probs) % ","; >>> >>> >> >> Thanks, but I already tried it. Doesn't compile. >> > > Er, if you re-read my post I was saying *not* to do that, because that > will not work, that is actually what the compiler is doing because of > operator precedence. You should memorize the precedence rules for > C++, *especially* if you are going to be dealing with heavily > templated operator libraries like Spirit. > http://en.wikipedia.org/wiki/Operators_in_C_and_C%2B%2B > > Because you are mixing right-shifts (>>) and greater-than's (>), the > precedence causes them to collapse in different ways, which is why you > need the parenthesis like this: > start %= (constitkind >> (id > (':' > (id >> probs)))) % ","; > > Again, learn the C++ operator precedence rules and all this will make > easy sense. :) > _______________________________________________ > Boost-users mailing list > Boost-users(a)lists.boost.org > http://lists.boost.org/mailman/listinfo.cgi/boost-users If I have understood your advice correctly, you suggest that this code should compile: > start %= (constitkind >> (id > (':' > (id >> probs)))) % ","; It doesn't. _______________________________________________ Boost-users mailing list Boost-users(a)lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users ____________________________________________________________ Sorry for the bad way to respond, on phone with outlook mobile. Do you have a complete compilable example that demonstrates your problem? Also, try asking on the Spirit mailing list.

3 2

Boost Bind Library
by Abhilash K 21 Apr '10

21 Apr '10

Is Boost Bind a library and is avaialable as a shared lib while building boost using bjam? If not, which shared lib contains Bind?

2 1

puzzle with enable_if
by John Dlugosz 21 Apr '10

21 Apr '10

I'm using the Microsoft 2008 compiler. The template template <typename T, typename D> struct is_proper_TD_types : std::tr1::integral_constant<bool, is_Universal_time_API<T>::value && (std::tr1::is_same<typename T::duration_t,D>::value || std::tr1::is_same<duration,D>::value || std::tr1::is_same<linear_duration,D>::value || is_dimensional_time<D>::value) > {}; gives an error "'T': must be a class or namespace when followed by '::'" when T is int. This kind of thing is mentioned in the enable_if documentation as the motivation for the "lazy" forms, because the compiler doesn't apply SFINAE for other templates. But, riddle me this: I created that line as an attempt to refactor the following, which DOES work OK: template <typename T, typename D> typename boost::enable_if_c< is_Universal_time_API<T>::value && (std::tr1::is_same<typename T::duration_t,D>::value || std::tr1::is_same<duration,D>::value || std::tr1::is_same<linear_duration,D>::value || is_dimensional_time<D>::value) ,T>::type operator+ (const T& t1, const D& d1) { // blah blah Basically, I just copied the bulk of the first argument of enable_if_c in the second listing to make a named metaprogramming predicate that I could use in several places. I don't see anything in your implementation of enable_if_c that would cause it to work: the argument is a template bool constant in both cases. Why does the bottom one work, when the top one doesn't? --John TradeStation Group, Inc. is a publicly-traded holding company (NASDAQ GS: TRAD) of three operating subsidiaries, TradeStation Securities, Inc. (Member NYSE, FINRA, SIPC and NFA), TradeStation Technologies, Inc., a trading software and subscription company, and TradeStation Europe Limited, a United Kingdom, FSA-authorized introducing brokerage firm. None of these companies provides trading or investment advice, recommendations or endorsements of any kind. The information transmitted is intended only for the person or entity to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipient is prohibited. If you received this in error, please contact the sender and delete the material from any computer.

3 9

serialization of unordered_map
by Igor Filippov 21 Apr '10

21 Apr '10

Answering my own question - I was able to figure it out last night. Thank you for the wonderful library! Igor

2 3

[date_time] Formating overall lacking in flexibility & functionality?
by Sebastian Karlsson 21 Apr '10

21 Apr '10

Sorry for being a bit of a douche, but I find the formatting options in date_time lacking and would like to see what others think. We have a use case that I think displays some of the shortcomings. We have a time duration stored as an int representing the number of miliseconds. When displaying the time duration we want to use MM:SS,FFF, padding with 0s in order to get them to line up nicely. First problem here is it's not possible to control the number of fractions, we use substr to remove the last 3 unwanted digits, this however naturally doesn't respect rounding. The second problem is that it doesn't seem to be possible to control the padding, ( although this isn't a problem for our use case ). Another problem is that it doesn't seem to be possible to format a time_duration directly, the only solution which I've been able to find is to construct an arbitrary valid date and keep the time part at zero. This seems both unnecessary and imposes restrictions if one were interested in actually measuring and format long durations of time. I also think formatting a date time is often unnecessary verbose. I would personally appreciate formatting functionality along the lines of: // Apply formating_string to duration using supplied locale std::string format_time_duration( const boost::posix_time::time_duration& duration, const std::string& formating_string, const std::locale& locale = std::locale::classic() ); For reference, this is how we format our times: std::string format_highscore( unsigned int miliseconds ) { boost::posix_time::time_duration td = boost::posix_time::milliseconds( 10004 ); boost::posix_time::ptime pt( ( boost::gregorian::date( 2000, 1, 1 ) ) ); pt += td; std::stringstream ss; boost::posix_time::time_facet* df( new boost::posix_time::time_facet( "%M:%S,%f" ) ); ss.imbue( std::locale( ss.getloc(), df ) ); ss << pt; std::string ret = ss.str(); ret = ret.substr( 0, ret.size() - 3 ); return ret; }

1 0

[boost] [iostreams] Pipelined reference_wrappers of filters/device
by feverzsj 21 Apr '10

21 Apr '10

hi all, BOOST_IOSTREAMS_PIPABLE generate something like : template<..., typename component> pipeline<...> operator|(your_filter const& , component const&); It is proper for plan use, e.g. filter1 | filter2 | ... | device. But for boost::reference_wrapper, ref(filter1) | ref(filter2) |...|ref(device), after type conversion, will be : filter1 | ref(filter2) |...|ref(device), which may confuse the user. So, will it be a good idea to make another reloaded operator|(reference_wrapper<your_filter> const&, component const&)) ? I have written a macro to handle this( simply copy and modify BOOST_IOSTREAMS_PIPABLE): #define BOOST_IOSTREAMS_EXTENDED_PIPABLE(filter, arity) \ template< BOOST_PP_ENUM_PARAMS(arity, typename T) \ BOOST_PP_COMMA_IF(arity) typename Component> \ ::boost::iostreams::pipeline< \ ::boost::iostreams::detail::pipeline_segment<filter BOOST_IOSTREAMS_TEMPLATE_ARGS(arity, T)> \ ,Component \ > \ operator|(const filter BOOST_IOSTREAMS_TEMPLATE_ARGS(arity, T)& f, const Component& c) \ { \ typedef \ ::boost::iostreams::detail::pipeline_segment< \ filter BOOST_IOSTREAMS_TEMPLATE_ARGS(arity, T) \ > segment; \ return ::boost::iostreams::pipeline<segment, Component> \ (segment(f), c); \ } \ template<BOOST_PP_ENUM_PARAMS(arity, typename T) \ BOOST_PP_COMMA_IF(arity)typename Component> \ ::boost::iostreams::pipeline< \ ::boost::iostreams::detail::pipeline_segment< \ boost::reference_wrapper<filter BOOST_IOSTREAMS_TEMPLATE_ARGS(arity, T)> > \ ,Component \ > \ operator|(const boost::reference_wrapper<filter BOOST_IOSTREAMS_TEMPLATE_ARGS(arity, T)>& wf \ ,const Component& c) \ { \ typedef \ ::boost::iostreams::detail::pipeline_segment< \ boost::reference_wrapper<filter BOOST_IOSTREAMS_TEMPLATE_ARGS(arity, T)> \ > segment; \ return ::boost::iostreams::pipeline<segment, Component>(segment(wf), c); \ } \ /**/ -- View this message in context: http://old.nabble.com/-boost---iostreams--Pipelined-reference_wrappers-of-f… Sent from the Boost - Users mailing list archive at Nabble.com.

1 0

[Boost MPI] : Point to Point Communication
by Pooja Varshneya 21 Apr '10

21 Apr '10

Hi Everyone, I am trying to send a user-defined structure named ABC using boost::mpi::send () call. The given struct contains a vector "data" whose size is determined at runtime. Objects of struct ABC are sent by master to slaves. But the slaves need to know the size of vector "data" so that the sufficient buffer is available on the slave to receive this data. I can work around it by sending the size first and initialize sufficient buffer on the slave before receiving the objects of struct ABC. But that defeats the whole purpose of using STL containers. Does anyone know of a better way to do handle this ? Any suggestions are greatly appreciated. Here is a sample code that describes the intent of my program. This code fails at runtime due to above mentioned reason. struct ABC { double cur_stock_price; double strike_price; double risk_free_rate; double option_price; std::vector <char> data; }; namespace boost { namespace serialization { template<class Archive> void serialize (Archive &ar, struct ABC &abc, unsigned int version) { ar & abc.cur_stock_price; ar & abc.strike_price; ar & abc.risk_free_rate; ar & abc.option_price; ar & bopr.data; } } } BOOST_IS_MPI_DATATYPE (ABC); int main(int argc, char* argv[]) { mpi::environment env (argc, argv); mpi::communicator world; if (world.rank () == 0) { ABC abc_obj; abc.cur_stock_price = 1.0; abc.strike_price = 5.0; abc.risk_free_rate = 2.5; abc.option_price = 3.0; abc_obj.data.push_back ('a'); abc_obj.data.push_back ('b'); world.send ( 1, ANY_TAG, abc_obj;); std::cout << "Rank 0 OK!" << std::endl; } else if (world.rank () == 1) { ABC abc_obj; // Fails here because abc_obj is not big enough world.recv (0,ANY_TAG, abc_obj;); std::cout << "Rank 1 OK!" << std::endl; for (int i = 0; i < abc_obj;.data.size(); i++) std::cout << i << "=" << abc_obj.data[i] << std::endl; } MPI_Finalize(); return 0; } Thanks, Pooja

1 0

Who can give me a sample for how to using boost::thread in a MFC regular dll?
by DDGG 21 Apr '10

21 Apr '10

Hello everyone! I have a MFC application that using boost::thread, it runs well. Now I wrapped it to a MFC regular dll, but I get a assertion error when I using this dll. // (In my another MFC dialog application) void AFXAPI AfxCoreInitModule() { ASSERT(AfxGetModuleState() != AfxGetAppModuleState()); // assertion error // the return value of AfxGetModuleState() and AfxGetAppModuleState() are both not-empty, // but they are different. ... } Any advice? thanks!

3 5

Boost.MultiIndex Solaris compatibility
by Andre.TERROUX＠sungard.com 21 Apr '10

21 Apr '10

Hello, boost/multi_index/indexed_by.hpp does not compile on my SunOS 5.10 system. CC version: CC: Sun C++ 5.10 SunOS_i386 2009/06/03 Compiling this test program using boost 1.42: #include <boost/multi_index/indexed_by.hpp> main() { } Reports the following errors: "/sr/gldev/shrdlibs/boostlibs/1.42.0/boost/multi_index/indexed_by.hpp", line 56: Error: Type name expected instead of "BOOST_PP_ENUM_1". "/sr/gldev/shrdlibs/boostlibs/1.42.0/boost/multi_index/indexed_by.hpp", line 58: Error: Expected "class" or "typename" before "BOOST_MULTI_INDEX_INDEXED_BY_TEMPLATE_PARM" . "/sr/gldev/shrdlibs/boostlibs/1.42.0/boost/multi_index/indexed_by.hpp", line 58: Error: Type name expected instead of "T". 3 Error(s) detected. Is Boost.MultiIndex Solaris compatible? Am I missing something? I read the following about multi_index on boost.org: No problems have been detected with this platform. Last tested for compiler version Sun C++ 5.10 (Sun Studio 12 Update 1). The option -library=stlport4 was used to replace the default standard library with STLport. I tried with the -library=stlport4 but same errors. Thank you, Andre

2 2

date_time bad to_iso_string formatting
by Ludo Kontsek 21 Apr '10

21 Apr '10

Hi. I just found a problem in date_time library with iso_string formating. I search the mailing list and bugs and found out that the bug is really old and the patches are suggested that solves the problem. Mailing list thread: http://lists.boost.org/Archives/boost/2007/03/117276.php Bug tickets https://svn.boost.org/trac/boost/ticket/1726 and https://svn.boost.org/trac/boost/ticket/1674 . The patches are really simple. Can anyoune tell me when this problem will be solved? For now I have my boost files patched, but it would be better to have it in official distribution. Ludo

1 0

[Program_options] Custom <arg>
by Bo Jensen 21 Apr '10

21 Apr '10

Hi, Can anyone point me to a working example of replacing the arguments in program_options i.e : --someoption <arg> so I would like to replace <arg>. Thanx Bo

2 3

[GIL] For next release
by Eloi Du Bois 21 Apr '10

21 Apr '10

Hi, I give you this files which contains a bunch of important fixes. There was a copy/past error inside a constructor (btw, be careful because when we found this bug together, your trunk was differing from the public release)... I already gave it to you, but I didn't had a confirmation that it will be on the next gil release. Thank you, Eloi.

1 0

problem linking
by Ed Keith 20 Apr '10

20 Apr '10

I am having a problem linking with boost program options on windows with msvs. No mater what I specify on the command line, cl tries to ling with 'libboost_program_options-vc90-mt-s-1_42.lib'. When I built the boost libraries it built 'libboost_program_options-vc90-mt-1_42.lib', 'libboost_program_options-vc90-mt.lib', 'libboost_program_options-vc90-mt-gd-1_42.lib', and 'libboost_program_options-vc90-mt-gd.lib', but not 'libboost_program_options-vc90-mt-s-1_42.lib'. I have tried to tell cl to link with one of the libraries that was build, but it still links with 'libboost_program_options-vc90-mt-s-1_42.lib' regardless of what I specify on the command line. Has anyone else seen this problem or have any idea how to solve it? Thank you, -EdK Ed Keith e_d_k(a)yahoo.com Blog: edkeith.blogspot.com

2 2

Re: [Boost-users] still stuck on expectation points
by philip tucker 20 Apr '10

20 Apr '10

This start %= (constitkind > id > ':' > id >> probs) % ","; // FAILS Should read start %= (constitkind >> id > ':' > id >> probs) % ","; // FAILS Sorry.

3 6

Re: [Boost-users] (no subject)
by Overmind DL1 20 Apr '10

20 Apr '10

Um... How did the pill spam make it through the mods? -----Original Message----- From: Shaolin <shaolinfinest(a)gmail.com> Sent: Tuesday, April 20, 2010 3:15 PM To: shaolinfinest(a)gmail.com <shaolinfinest(a)gmail.com>; b0003478(a)hotmail.com <b0003478(a)hotmail.com>; boost-users(a)lists.boost.org <boost-users(a)lists.boost.org>; customerservice(a)colonialmedical.com <customerservice(a)colonialmedical.com>; presario_support_en(a)mail.support.hp.com <presario_support_en(a)mail.support.hp.com>; customercare(a)singlemuslim.co.uk <customercare(a)singlemuslim.co.uk>; delete(a)creativecow.net <delete(a)creativecow.net>; dereck(a)gmail.com <dereck(a)gmail.com>; hesido(a)yahoo.com <hesido(a)yahoo.com> Subject: [Boost-users] (no subject) http://KeioiMasongez.spaces.live.com _______________________________________________ Boost-users mailing list Boost-users(a)lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

2 1

(no subject)
by Shaolin 20 Apr '10

20 Apr '10

http://KeioiMasongez.spaces.live.com

1 0

boostbook and project-config
by Jonathan Brannan 20 Apr '10

20 Apr '10

I'm trying to make some documentation for a project that uses boost.build v2. I'm getting the error: Generating Output File: ../build/docs/gcc-4.3/docs/my_doc.xml file /tmp/jam23e7c859.000 <?xml version="1.0"?> <!DOCTYPE catalog PUBLIC "-//OASIS/DTD Entity Resolution XML Catalog V1.0//EN" "http://www.oasis-open.org/committees/entity/release/1.0/catalog.dtd"> <catalog xmlns="urn:oasis:names:tc:entity:xmlns:xml:catalog"> <rewriteURI uriStartString="http://www.boost.org/tools/boostbook/dtd/" rewritePrefix="file:///home/build/boost_1_39_0/tools/boostbook/dtd/"/ > </catalog> text-action /bin/boostbook_catalog.xml cat "/tmp/jam23e7c859.000" > "/bin/boostbook_catalog.xml" /bin/sh: line 1: /bin/boostbook_catalog.xml: Permission denied I have: docs/Jamfile using xsltproc ; using boostbook ; using fop : /usr/bin/fop : : /usr/bin/java ; using quickbook : /home/build/boost_1_39_0/dist/bin/quickbook ; xml my_doc : my_doc.qbk ; boostbook standalone : my_doc : I narrowed the problem down to having a ../project-config.jam. This is being detected as the root-project in rule xml-catalog ( ) in tools/boostbook.jam. If I remove the project-config.jam, it correctly detects the build path and goes correctly. Is my use wrong or is there something else I can do to work around this? I tried adding a project in the docs jamfile, but it did not seem to help.

1 1

error in compilation
by pedro chaparro 20 Apr '10

20 Apr '10

Hi everyone, i'm traying compile the example http://www.boost.org/doc/libs/1_42_0/doc/html/boost_asio/tutorial/tutdaytim…, but i getting this error, what i missing?? Thanks!! pp@hobbes:/home/pdro7/ns-Sockets# c++ -I ../boost_1_40_0 myserver.cpp -o myserver /usr/include/libboost_system.a /usr/include/libboost_thread.a /usr/include/libboost_date_time.a /usr/include/libboost_regex.a /usr/include/libboost_serialization.a -lpthread /usr/include/libboost_system.a(error_code.o): In function `boost::system::get_generic_category()': error_code.cpp:(.text+0x90): undefined reference to `__cxa_guard_acquire' error_code.cpp:(.text+0xaa): undefined reference to `__cxa_guard_release' /usr/include/libboost_system.a(error_code.o): In function `boost::system::get_system_category()': error_code.cpp:(.text+0x100): undefined reference to `__cxa_guard_acquire' error_code.cpp:(.text+0x11a): undefined reference to `__cxa_guard_release' /usr/include/libboost_system.a(error_code.o): In function `(anonymous namespace)::generic_error_category::message(int) const': error_code.cpp:(.text+0x176): undefined reference to `__cxa_guard_acquire' error_code.cpp:(.text+0x1eb): undefined reference to `__cxa_guard_release' error_code.cpp:(.text+0x231): undefined reference to `__cxa_guard_abort' /usr/include/libboost_system.a(error_code.o): In function `boost::system::errc::make_error_condition(boost::system::errc::errc_t)': error_code.cpp:(.text._ZN5boost6system4errc20make_error_conditionENS1_6errc_tE[boost::system::errc::make_error_condition(boost::system::errc::errc_t)]+0x38): undefined reference to `__cxa_guard_acquire' error_code.cpp:(.text._ZN5boost6system4errc20make_error_conditionENS1_6errc_tE[boost::system::errc::make_error_condition(boost::system::errc::errc_t)]+0x52): undefined reference to `__cxa_guard_release' collect2: ld returned 1 exit status -- Ing Pedro Alonso Chaparro Valero Ciudad Politecnica de la Innovación iTEAM - Mobile Communications Group Polytechnic University of Valencia C\ Camino de Vera S/N, Edificio 8G 46022 Valencia, Spain

1 0

Re: [Boost-users] Inconsistent dll linkage trying to use boost/test as dll
by McNamara, Nate 20 Apr '10

20 Apr '10

Mikko, Thanks! With Dependency Walker, I was able to fix the problem. Cheers, Nate ________________________________________ This E-Mail (including any attachments) may contain privileged or confidential information. It is intended only for the addressee(s) indicated above. The sender does not waive any of its rights, privileges or other protections respecting this information. Any distribution, copying or other use of this E-Mail or the information it contains, by other than an intended recipient, is not sanctioned and is prohibited. If you received this E-Mail in error, please delete it and advise the sender (by return E-Mail or otherwise) immediately. This E-Mail (including any attachments) has been scanned for viruses. It is believed to be free of any virus or other defect that might affect any computer system into which it is received and opened. However, it is the responsibility of the recipient to ensure that it is virus free. The sender accepts no responsibility for any loss or damage arising in any way from its use. E-Mail received by or sent from RBC Capital Markets is subject to review by Supervisory personnel. Such communications are retained and may be produced to regulatory authorities or others with legal rights to the information. IRS CIRCULAR 230 NOTICE: TO COMPLY WITH U.S. TREASURY REGULATIONS, WE ADVISE YOU THAT ANY U.S. FEDERAL TAX ADVICE INCLUDED IN THIS COMMUNICATION IS NOT INTENDED OR WRITTEN TO BE USED, AND CANNOT BE USED, TO AVOID ANY U.S. FEDERAL TAX PENALTIES OR TO PROMOTE, MARKET, OR RECOMMEND TO ANOTHER PARTY ANY TRANSACTION OR MATTER.

1 0

Passing * to member function as parameter
by Etienne Philip Pretorius 20 Apr '10

20 Apr '10

Hello List, I am using boost::asio. My client performs a lot of async read requests and then only responds to those with a write operation. How would I pass a pointer to a member function from the read request to the write handler to call when it performs the write. void handle_read_banner( const boost::system::error_code& error, std::size_t bytes_transferred ) { if(!error) { response_.consume(bytes_transferred); boost::asio::async_write(socket_, request_, boost::bind(&asterisk::handle_write_request, this, boost::asio::placeholders::error //, * to next read handler... )); }else{ throw(boost::system::system_error(error)); } } void handle_write_request( const boost::system::error_code& error //, memfunction func ) { if (!error) { boost::asio::async_read_until(socket_, response_, "\r\n", boost::bind( //&asterisk::handle_read_login_attempt, func this, boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred)); }else{ throw(boost::system::system_error(error)); } } Thank you, Etienne

2 1

serialization of unordered_map
by Igor Filippov 20 Apr '10

20 Apr '10

I am struggling with getting serialization to work with unordered_map. I have found someone else's header file for that purpose and modified it so the compilation goes through without errors, however I'm getting segfault when attempting to run the executable. The header file is attached, any help will be most appreciated. Best regards, Igor P.S. I believe the original code is from René Bürgel who asked for it to be included into serialization library back in 2007.

1 0

[BGL] graph serialization
by Damien Maupu 19 Apr '10

19 Apr '10

Dear all, I have a graph with edge property is a smart pointer to myEdge class. I want to save my graph and choose the serialization option. Saving the graph seems to work (if exporter to a text file I can see that information is there). Unfortunately, loading the graph fails as no edges are loaded. In facts, the edge data is loaded (if I stop the debugger to the edge serialization info seems to come) but not added to the graph. In file adj_list_serialize.hpp Ln 95: tie(e,inserted) = add_edge(verts[u], verts[v], graph); Boolean "inserted" is true but still no edge is added to my graph m_edges array (size keep to be 0). I was wandering if it's because I am using smart pointer as my edge property and that while saving doesn't require memory allocation for the edge smart pointer, loading will. Would it be possible that this step is skip? How could I fixed it? Did anyone faced the same problem My graph is a adjacency list and I did add the definition BOOST_SERIALIZATION_SHARED_PTR for myEdge class. Thank you very much Damien

2 1

Boost TR1 sub-package
by Michael Jackson 19 Apr '10

19 Apr '10

Does there exist a Bosot-TR1 sub-package that I could use on a cross platform project? I am interested specifically in the TR1 stuff and not the rest of Boost and it seems that using Boost-TR1 would be the most portable way to use TR1 since not all compiler vendors have a TR1 implementation ready yet. Thoughts? -- Mike Jackson

1 0

Error with GCC and TR1 (error: no include path in which to search for tr1/type_traits)
by Anteru 19 Apr '10

19 Apr '10

Hi, I'm using GCC 4.4 with Boost 1.40, and I've recently came across a library which uses tr1/tuple. The problem I'm running into now is that I include <boost/tr1/tuple.hpp>, and it does not include <tr1/tuple>, but rather pulls in the Boost implementation -- which gives me compile errors like /usr/include/boost/tr1/tuple.hpp:63: error: ‘tuple’ is already declared in this scope /usr/include/boost/tr1/tuple.hpp:72: error: ‘tuple_size’ is already declared in this scope /usr/include/boost/tr1/tuple.hpp:73: error: ‘tuple_element’ is already declared in this scope So I'd really like to pull in the TR1 implementation from the compiler, to avoid these collisions. In order to fix this, I tried to define BOOST_HAS_GCC_TR1 as specified in the docs -- without success, I'm getting now /usr/include/boost/tr1/type_traits.hpp:13:49: error: no include path in which to search for tr1/type_traits As described in the docs, I added several more defines: DBOOST_HAS_GCC_TR1 BOOST_TR1_DISABLE_INCLUDE_NEXT=1 BOOST_TR1_GCC_INCLUDE_PATH=/usr/include/c++/4.4/ without success, I'm still getting the "no include path" error. I'm using the system boost, which is installed in /usr/include/boost; and I'd really like to keep using it. Is there any other way to force Boost to pick up the compiler's TR1 library? Cheers, Anteru

2 1

[Review] [ITL] ITL formal review results
by Hartmut Kaiser 19 Apr '10

19 Apr '10

Hi all, The formal review of the Interval Template Library (ITL) written by Joachim Faulhaber started February 18th and ended March 7th, 2010. We saw a lively discussion resulting in 14 votes: 10 people voted unconditionally YES, 3 voted conditionally YES, and 1 reviewer voted NO. The overwhelming majority of the votes was YES which reflects the overall discussion and the general consensus of this library being worth to be included into Boost. Based on this result and the discussions we saw the Interval Template Library is now formally accepted into Boost. Detailed results ---------------- Pros: Almost all reviewers highlighted the general usefulness of the library. The more experience the reviewers had with the library in real world applications the more they emphasized its usefulness. Here are some quotes: - "ITL solved this problem for me, in a way that honestly freed me from having to think about a lot of the unsavory low-level details." - " Until now, we only used the library for intervals of date-times (coded as integers), but I'm sure, that its usefulness goes far beyond." - " Very useful. I mentioned two projects where the library would have helped me if it had been into Boost earlier, and I'm considering rewriting them such that the problems make use of the library, and simplify them in that way." The comments on the quality of the documentation are unanimous: "impressive and quite complete", "I couldn't ask for more". It seemed to be generally helpful to understand the concepts of the library and to get started. Some people asked to add more simple quick-start examples to the documentation and the distribution. Overall, the library is mature and easy to use. All reviewers actually utilizing the ITL library for real world use cases reported they were able to start quickly and without problems. All reviewers using ITL in real world applications stated that no performance problems were encountered. This is important to note as the NO vote was based on the current lack of a interval tree implementation, which was considered to result in suboptimal performance for certain use cases. Cons: Some aspects of the design have been criticized: "OO-type design decisions", "fat 'one size fits all'-interval class template", and "incomplete extraction of global functions" are the major points of critique. These points have real merit. In order to make the design and interface more flexible and more durable these have to be rectified before the final inclusion of the library into Boost's code base. Joachim already agreed to a list of things to change addressing those problems. For certain use cases, specifically for interval map of collections, the current implementation has suboptimal complexity characteristics that leads to O(n^2) space usage in the worst case. OTOH, for the majority of applications of the library the worst case scenario seems to be (reportedly) irrelevant. This issue has been discussed at length and Joachim plans to add an implementation with a better worst case performance of the affected class templates as later optimizations. This is not considered to be a precondition to full inclusion into Boost's code base as it is not anticipated to cause any interface changes. Last but not least people suggested to change the name of the library as having the word template in the name does not carry any useful information. Joachim already agreed to this. Regards Hartmut Review Manager --------------- Meet me at BoostCon www.boostcon.com

2 1

[circular_buffer] About overwriting elements
by Daniele Barzotti 19 Apr '10

19 Apr '10

Hi, in the introductory example I see this: int a = cb[0]; // a == 1 int b = cb[1]; // b == 2 int c = cb[2]; // c == 3 // The buffer is full now, pushing subsequent // elements will overwrite the front-most elements. cb.push_back(4); // Overwrite 1 with 4. cb.push_back(5); // Overwrite 2 with 5. // The buffer now contains 3, 4 and 5. a = cb[0]; // a == 3 b = cb[1]; // b == 4 c = cb[2]; // c == 5 and I would ask why the 4 and 5 are in the 2nd and 3th position instead of 1st and 2nd respectively. I thought that it worked in the following way: 1 2 3 1 2 3 1 2 3 [A][B][C] -> push_back(D) -> [D][B][C] -> push_back(E) -> [D][E][C] I need a circular buffer for buffering network data and I need that the old data is replaced but doesn't change its position.. Thanks, Daniele.

3 6

[serialization] postprocessing object after deserialization
by Václav Šmilauer 19 Apr '10

19 Apr '10

Hi, I am using boost::serialization for hierarchy of classes; I need to process attributes after deserialization, but I am facing some (perhaps design) issues. The top class is Serializable, with serialization code like this: struct Serializable{ friend class boost::serialization::access; virtual void preProcess(bool deserializing){} virtual void postProcess(bool deserializing){} template <class ArchiveT> void serialize(ArchiveT & ar, unsigned int version){ // this sequence is always the same: preProcess(ArchiveT::is_loading::value); // preprocess /* no base class to be serialized */ // serialize base class /* no attributes in Serializable itself */ // serialize attributes postProcess(ArchiveT::is_loading::value); // postprocess }; }; Each derived class then defines serialize function and optionally overrides {pre,post}Process, which are meant for pre-computing some non-serialized data from known attributes, for instance. struct Derived: public Serializable{ friend class boost::serialization::access; template <class ArchiveT> void serialize(ArchiveT & ar, unsigned int version){ preProcess(ArchiveT::is_loading::value); // preprocess ar & BOOST_SERIALIZATION_BASE_OBJECT_NVP(Serializable); // base class ar & BOOST_SERIALIZATION_NVP(attr1); // attributes ar & BOOST_SERIALIZATION_NVP(attr2); postProcess(ArchiveT::is_loading::value); // postprocess } }; The problem is that {pre,post}Process are not overridden in most cases and will be called multiple times, perhaps with invalid data: e.g. when deserializing derived class, postProcess will be called for each parent class; since it is virtual, it will end up calling Derived::postProcess _before_ attr1 and attr2 are deserialized from archive. Later, it will be called again. My questions are therefore: 1. If boost::serialization provides some hook functions for this purpose (I didn't find anything in documentation and via google either) 2. If you can suggest some way to have the {pre,post}Process function called for each class exactly once, at the right place(s). Best regards, Vaclav

1 0

error install boost on linux redhat
by sara_mahdavi 19 Apr '10

19 Apr '10

hi all, I install boost_1_38_0 on linux redhat ,in command ./configure ,following error is occur : ///////////////////////////////////////////// Building Boost.Jam with toolset gcc... tools/jam/src/bin.linuxx86/bjam Detecting Python version... 2.4 Detecting Python root... /usr Unicode/ICU support for Boost.Regex?... not found. Backing up existing Boost.Build configuration in user-config.jam.2 Generating Boost.Build configuration in user-config.jam... Generating Makefile... ////////////////////////////////////////// please help me , thank and best regard. -- View this message in context: http://old.nabble.com/error-install-boost-on-linux-redhat-tp28282370p282823… Sent from the Boost - Users mailing list archive at Nabble.com.

2 1

"expected unqualified-id" error
by Mahmood Naderan 19 Apr '10

19 Apr '10

Hi, I have successfully build Boost, but when I want to "make" a program which uses Boost library, I get an error that points to one of Boost files. boost/mpl/aux_/numeric_op.hpp:250: error: expected unqualified-id before ‘:’ token Part of the code is: #if !defined(BOOST_MPL_CFG_MSVC_ETI_BUG) : AUX778076_OP_IMPL_NAME< typename AUX778076_OP_TAG_NAME<N1>::type , typename AUX778076_OP_TAG_NAME<N2>::type >::template apply<N1,N2>::type #else .... It is strange for me because, the libboost are created so why get another error in boost now? // Naderan *Mahmood;

1 0

[date_time] Formating a posix::time_duration
by Sebastian Karlsson 18 Apr '10

18 Apr '10

I have a racing time in miliseconds which I'd like to apply formatting to, I can't seem to get it to work using posix::time_duration and what I'd think is the appropriate time_facet ( it produces the same results as the default facet ). Looking at posix_time_io.hpp I see the following comment: "// todo fix to use facet -- place holder for now...", leading me to believe that there's perhaps no way to apply the formating strings to a time_duration yet? We want to present our times as MM:SS,FFF.

1 0

Re: [Boost-users] Spirit.Qi : forfait !
by Michele Caini 18 Apr '10

18 Apr '10

Il 17/04/2010 20:47, Igor R ha scritto: >> Parser is part of a more complex software so it is not so easy to extract it from the software. > > Usually a parser uses structs definition only. If it's too much > "blended" with the other parts of your program, then maybe it's worth > improving your code structure anyway. Parser is part of classes involved into builder pattern. Or better, I have a class A (without setter methods) and a friend class A_builder that aims to create and initialize objects of A. That's all, A_builder uses the parser to read from streams and fill structures strictly related to A, using dedicated functions. Considering this, parser is part of a more complex software and I can't easy extract it from the software. > Is it "something like" or it's the exact input? It looks like you try > to parse "1"/"0" with qi::bool_. This is incorrect, because bool_ > expects "true"/"false", so use qi::int_ instead. Oops! I'm a stupid, qi::bool_ really wants "true"/"false" string? Ehm... Oooook! Maybe this is the problem, I'll try. Thanks a lot to all, Michele

1 0

Re: [Boost-users] compilation won't stop upon errors
by Mahmood Naderan 18 Apr '10

18 Apr '10

I found the solution at https://svn.boost.org/trac/boost/attachment/ticket/2069/boost_mpl_gcc-4_4.p… #elif BOOST_PP_ITERATION_DEPTH() == 1 must be changed to #elif BOOST_PP_ITERATION_DEPTH == 1 // Naderan *Mahmood; ________________________________ From: Mahmood Naderan <nt_mahmood(a)yahoo.com> To: boost-users(a)lists.boost.org Sent: Sun, April 18, 2010 6:33:42 PM Subject: compilation won't stop upon errors Hi, During the installation of BOOST, I get many errors but the process won't stop. I have pasted some of the errors. What is the problem? from /home/mahmood/boost_1_33_0/boost/program_options/detail/config_file.hpp:17, from /home/mahmood/boost_1_33_0/libs/program_options/build/../src/config_file.cpp:10: /home/mahmood/boost_1_33_0/boost/mpl/apply_wrap.hpp:81:31: error: missing binary operator before token "(" /home/mahmood/boost_1_33_0/boost/mpl/apply_wrap.hpp:173:31: error: missing binary operator before token "(" In file included from /home/mahmood/boost_1_33_0/boost/mpl/lambda.hpp:18, from /home/mahmood/boost_1_33_0/boost/mpl/apply.hpp:25, from /home/mahmood/boost_1_33_0/boost/iterator/iterator_facade.hpp:34, from /home/mahmood/boost_1_33_0/boost/program_options/eof_iterator.hpp:9, from /home/mahmood/boost_1_33_0/boost/program_options/detail/config_file.hpp:17, from /home/mahmood/boost_1_33_0/libs/program_options/build/../src/config_file.cpp:10: /home/mahmood/boost_1_33_0/boost/mpl/bind.hpp:364:31: error: missing binary operator before token "(" /home/mahmood/boost_1_33_0/boost/mpl/bind.hpp:531:31: error: missing binary operator before token "(" In file included from /home/mahmood/boost_1_33_0/boost/mpl/lambda.hpp:22, from /home/mahmood/boost_1_33_0/boost/mpl/apply.hpp:25, from /home/mahmood/boost_1_33_0/boost/iterator/iterator_facade.hpp:34, from /home/mahmood/boost_1_33_0/boost/program_options/eof_iterator.hpp:9, from /home/mahmood/boost_1_33_0/boost/program_options/detail/config_file.hpp:17, from /home/mahmood/boost_1_33_0/libs/program_options/build/../src/config_file.cpp:10: // Naderan *Mahmood;

1 0

compilation won't stop upon errors
by Mahmood Naderan 18 Apr '10

18 Apr '10

Hi, During the installation of BOOST, I get many errors but the process won't stop. I have pasted some of the errors. What is the problem? from /home/mahmood/boost_1_33_0/boost/program_options/detail/config_file.hpp:17, from /home/mahmood/boost_1_33_0/libs/program_options/build/../src/config_file.cpp:10: /home/mahmood/boost_1_33_0/boost/mpl/apply_wrap.hpp:81:31: error: missing binary operator before token "(" /home/mahmood/boost_1_33_0/boost/mpl/apply_wrap.hpp:173:31: error: missing binary operator before token "(" In file included from /home/mahmood/boost_1_33_0/boost/mpl/lambda.hpp:18, from /home/mahmood/boost_1_33_0/boost/mpl/apply.hpp:25, from /home/mahmood/boost_1_33_0/boost/iterator/iterator_facade.hpp:34, from /home/mahmood/boost_1_33_0/boost/program_options/eof_iterator.hpp:9, from /home/mahmood/boost_1_33_0/boost/program_options/detail/config_file.hpp:17, from /home/mahmood/boost_1_33_0/libs/program_options/build/../src/config_file.cpp:10: /home/mahmood/boost_1_33_0/boost/mpl/bind.hpp:364:31: error: missing binary operator before token "(" /home/mahmood/boost_1_33_0/boost/mpl/bind.hpp:531:31: error: missing binary operator before token "(" In file included from /home/mahmood/boost_1_33_0/boost/mpl/lambda.hpp:22, from /home/mahmood/boost_1_33_0/boost/mpl/apply.hpp:25, from /home/mahmood/boost_1_33_0/boost/iterator/iterator_facade.hpp:34, from /home/mahmood/boost_1_33_0/boost/program_options/eof_iterator.hpp:9, from /home/mahmood/boost_1_33_0/boost/program_options/detail/config_file.hpp:17, from /home/mahmood/boost_1_33_0/libs/program_options/build/../src/config_file.cpp:10: // Naderan *Mahmood;

1 0

[GIL] Premultiplications when using color_convert
by Eloi Du Bois 18 Apr '10

18 Apr '10

Hi all, I am working on rgba32f view that have alpha values of 0. I need to apply a color_convert but it drops the values because of the 0 alpha valued. How can I disable alpha premultiplication ? If impossible, it should be a good idea to give a choice on copy_and_convert & color_convert. code sample: rgb32f_pixel p1, p2; p1[0] = 1.0f; p1[3] = 0.0f; color_convert(p1, p2); assert(p1[0] == p2[0]); Thank you by advance, Eloi Du Bois.

2 2

error in "make install"
by mahmoodn 18 Apr '10

18 Apr '10

Hi, I can not install boost libraries. Here is the output of my commands: mahmood@magma:boost_1_36_0$ pwd /home/mahmood/flexus-3.0.0/boost_1_36_0 mahmood@magma:boost_1_36_0$ ./configure Building Boost.Jam with toolset gcc... tools/jam/src/bin.linuxx86/bjam Detecting Python version... 2.6 Detecting Python root... /usr Unicode/ICU support for Boost.Regex?... not found. Generating Boost.Build configuration in user-config.jam... Generating Makefile... mahmood@magma:boost_1_36_0$ make install ./tools/jam/src/bin.linuxx86/bjam --user-config=user-config.jam --prefix=/usr/local --exec-prefix=/usr/local --libdir=/usr/local/lib --includedir=/usr/local/include install error: at /home/mahmood/flexus-3.0.0/boost_1_36_0/tools/build/v2/build/project.jam:843 error: duplicate initialization of gcc with the following parameters: error: version = 4.4.1 error: previous initialization at /home/mahmood/flexus-3.0.0/boost_1_36_0/tools/build/v2/build/project.jam:843 Not all Boost libraries built properly. thanks for any idea... -- View this message in context: http://old.nabble.com/error-in-%22make-install%22-tp28255807p28255807.html Sent from the Boost - Users mailing list archive at Nabble.com.

1 0

[visualizers] variant containing variant
by Igor R 17 Apr '10

17 Apr '10

Hello, The visualizer doesn't work with the following variant type (MSVC 9.0, https://svn.boost.org/svn/boost/sandbox/boost_docs/subprojects/DebuggerVisu…) variant<int, variant<int, double> > Is it a bug or a known issue / desired behaviour? Thanks.

2 1

Spirit.Qi : forfait !
by Michele Caini 17 Apr '10

17 Apr '10

Ok, nothing to do, I'm not able to write a working parser with Boost.Spirit!! I attach to this mail the original flex/bison based parser, that I wrote some years ago, and the one developed with Spirit. It seems that parsing doesn't start () but I don't understand why that happens, I've tryied several ways without success. Help me, please. I'm going crazy!! It's so simple, and so difficult at the same time... :-( Thanks in advance to all! Michele

4 4

Re: [Boost-users] [Date_Time] Visual Studio 8 debugger visualizer
by Bruno Durin 17 Apr '10

17 Apr '10

Hi, > Now that's cool. If you agree, I will add the usual headers to your file > (so I need you to agree to make this available under the Boost license) > and put it on the visualizers wiki page for everyone to download. Definitely. I agree for the Boost licence and the wiki page. Thanks, Bruno

3 4

Re: [Boost-users] [circular_buffer] About overwriting elements
by Daniele Barzotti 17 Apr '10

17 Apr '10

> Hi Daniele, > > The circular_buffer behaves like a sliding window - which is what you don't > want apparently. If you want the behaviour you described have a look at > array_one() and array_two() methods. > With regards, > > Jan Hi Jan, I haven't seen them! They are exatcly what I need! Regards, Daniele.

1 0

Re: [Boost-users] Inconsistent dll linkage trying to use boost/test as dll
by McNamara, Nate 17 Apr '10

17 Apr '10

Thanks for the quick response. Your hint plus a few tweaks to the Makefile and the test compiles again - and much faster. Unfortunately, when I run the test, I get the following unhelpful message: The application failed to initialize properly (0xc0150002). Click on OK to terminate the application. Here is the entirety of my program: #define BOOST_TEST_MODULE foo #define BOOST_TEST_DYN_LINK #include <boost/test/unit_test.hpp> BOOST_AUTO_TEST_CASE(my_test) { BOOST_CHECK_EQUAL(4, 4); } I got the same error when I tried #define BOOST_TEST_MAIN in place of BOOST_TEST_MODULE as well; as far as I can tell from the docs they are equivalent when using the dynamic library variant: http://www.boost.org/doc/libs/1_42_0/libs/test/doc/html/utf/compilation. html Thanks again for your help! Nate ________________________________________ This E-Mail (including any attachments) may contain privileged or confidential information. It is intended only for the addressee(s) indicated above. The sender does not waive any of its rights, privileges or other protections respecting this information. Any distribution, copying or other use of this E-Mail or the information it contains, by other than an intended recipient, is not sanctioned and is prohibited. If you received this E-Mail in error, please delete it and advise the sender (by return E-Mail or otherwise) immediately. This E-Mail (including any attachments) has been scanned for viruses. It is believed to be free of any virus or other defect that might affect any computer system into which it is received and opened. However, it is the responsibility of the recipient to ensure that it is virus free. The sender accepts no responsibility for any loss or damage arising in any way from its use. E-Mail received by or sent from RBC Capital Markets is subject to review by Supervisory personnel. Such communications are retained and may be produced to regulatory authorities or others with legal rights to the information. IRS CIRCULAR 230 NOTICE: TO COMPLY WITH U.S. TREASURY REGULATIONS, WE ADVISE YOU THAT ANY U.S. FEDERAL TAX ADVICE INCLUDED IN THIS COMMUNICATION IS NOT INTENDED OR WRITTEN TO BE USED, AND CANNOT BE USED, TO AVOID ANY U.S. FEDERAL TAX PENALTIES OR TO PROMOTE, MARKET, OR RECOMMEND TO ANOTHER PARTY ANY TRANSACTION OR MATTER.

2 1

[Spirit] still stuck on expectation points
by philip tucker 17 Apr '10

17 Apr '10

Hello, Here's a summary of my problem: My original fully functioning grammar was this: start %= (constitkind >> id >> ':' >> id >> probs) % ","; // WORKS where - constitkind exposes unsigned, - id exposes string, - probs exposes a list of doubles, - start exposes a list of constituent structures (Is that jargon acceptable?) It recognizes strings such as a:b, foo:bar [ 0.00 ], extraposed x:y [ 0.00, 0.50, 0.99, 1.0 ], optional z:a [ 0.00, 0.50, 0.99, 1.0 ] I wanted to replace the grammar with this (note the expectation points which replace sequence operators): start %= (constitkind > id > ':' > id >> probs) % ","; // FAILS That won't compile. All I can glean from the error report is that I've induced a type mismatch. What's wrong? I got as far as this by thrashing: start %= (constitkind >> (id > ':') >> id >> probs) % ","; // WORKS Why do the parentheses in (id > ':') permit compilation? Thanks very much for any help you can give me.

1 0

Compiler's telling me a Boost class isn't a class.
by G S 17 Apr '10

17 Apr '10

Hi all. Just started using Boost, and these three lines (which compile in another project) fail here: // Get a list of endpoints corresponding to the server name. tcp::resolver theResolver(boost::asio::io_service); tcp::resolver::query query("10.10.10.10", "http"); tcp::resolver::iterator endpoint_iterator = theResolver.resolve(query); The compiler gripes thus: error: request for member 'resolve' in 'theResolver', which is of non-class type 'boost::asio::ip::basic_resolver<boost::asio::ip::tcp, boost::asio::ip::resolver_service<boost::asio::ip::tcp> > ()(boost::asio::io_service)' "using boost::asio::ip::tcp;" appears in an earlier included file. I don't see why this would work elsewhere and not here. Anybody have a guess as to what the problem is? Thanks!

2 2

[test] spread case over multiple translation units
by Jeff Flinn 16 Apr '10

16 Apr '10

Is it possible have multiple cpp's linked for a single master test suite? Doing the naive below results int multiply defined symbols linker errror. See below: suite1.cpp ------------------------------------- #define BOOST_TEST_MAIN #define BOOST_TEST_MODULE Master #include <boost/test/unit_test.hpp> BOOST_AUTO_TEST_SUITE(Sweet1) BOOST_AUTO_TEST_CASE(TestCase1) { BOOST_CHECK (true); BOOST_REQUIRE(true); BOOST_REQUIRE(true); BOOST_CHECK (true); } BOOST_AUTO_TEST_CASE(TestCase2) { BOOST_CHECK (true); BOOST_REQUIRE(true); BOOST_REQUIRE(true); BOOST_CHECK (true); } BOOST_AUTO_TEST_SUITE_END() suite2.cpp ------------------------------------------ #define BOOST_TEST_MAIN #define BOOST_TEST_MODULE Master #include <boost/test/unit_test.hpp> BOOST_AUTO_TEST_SUITE(Sweet2) BOOST_AUTO_TEST_CASE(TestCaseA) { BOOST_CHECK (true); BOOST_REQUIRE(true); BOOST_REQUIRE(true); BOOST_CHECK (true); } BOOST_AUTO_TEST_CASE(TestCaseB) { BOOST_CHECK (true); BOOST_REQUIRE(true); BOOST_REQUIRE(true); BOOST_CHECK (true); } BOOST_AUTO_TEST_SUITE_END()

1 1

UTF : capturing asserts
by Carla Strembicke 16 Apr '10

16 Apr '10

Hi, Just started using the BOOST unit test framework. I have legacy code that exercises asserts. This resided on both a linux and windows platform. Using 1.42 release of boost. Is there a method in which to capture assert so as to pass a test ( like BOOST_REQUIRE_THROW)? It is either that, compile code without debug on ( which I wouldn't want to do if debugging) or replace all asserts which would be painful considering it is legacy code. Regards CONFIDENTIAL INFORMATION NOTICE: The information contained in this e-mail is privileged, confidential and intended solely for the use of the addressee named above. If the reader of this e-mail is not the intended recipient, you are hereby notified that any dissemination, distribution or copying of this e-mail is strictly prohibited. If you received this in error, please contact the sender and destroy all copies of this e-mail. Thank you.

3 2

Inconsistent dll linkage trying to use boost/test as dll
by McNamara, Nate 16 Apr '10

16 Apr '10

I'm a newbie, and I'm trying to get the most basic example unit test up and running. The following works: #define BOOST_TEST_MAIN #include <boost/test/included/unit_test.hpp> BOOST_AUTO_TEST_CASE(my_test) { BOOST_CHECK_EQUAL(4, 4); } However, it takes a while to compile, so I want to use the DLL version of the library. I built the DLL according to the instructions here: http://www.boost.org/doc/libs/1_42_0/libs/test/doc/html/utf/compilation/ standalone.html Then I updated my source as follows: #define BOOST_TEST_DYN_LINK #include <boost/test/included/unit_test.hpp> BOOST_AUTO_TEST_CASE(my_test) { BOOST_CHECK_EQUAL(4, 4); } When compiling the above, though, I get a seemingly unending stream of C4273 warnings: C:\Program Files\\boost\boost_1_42\boost/test/impl/compiler_log_formatter.ipp(61 ) : warning C4273: 'boost::unit_test::output::compiler_log_formatter::log_start' : inconsistent dll linkage C:\Program Files\\boost\boost_1_42\boost/test/output/compiler_log_format ter.hpp(39) : see previous definition of 'log_start' C:\Program Files\\boost\boost_1_42\boost/test/impl/compiler_log_formatter.ipp(71 ) : warning C4273: 'boost::unit_test::output::compiler_log_formatter::log_finish ' : inconsistent dll linkage C:\Program Files\\boost\boost_1_42\boost/test/output/compiler_log_format ter.hpp(40) : see previous definition of 'log_finish' C:\Program Files\\boost\boost_1_42\boost/test/impl/compiler_log_formatter.ipp(79 ) : warning C4273: 'boost::unit_test::output::compiler_log_formatter::log_build_ info' : inconsistent dll linkage etc. Any hints re: what I'm doing wrong are much appreciated. Cheers, Nate ________________________________________ This E-Mail (including any attachments) may contain privileged or confidential information. It is intended only for the addressee(s) indicated above. The sender does not waive any of its rights, privileges or other protections respecting this information. Any distribution, copying or other use of this E-Mail or the information it contains, by other than an intended recipient, is not sanctioned and is prohibited. If you received this E-Mail in error, please delete it and advise the sender (by return E-Mail or otherwise) immediately. This E-Mail (including any attachments) has been scanned for viruses. It is believed to be free of any virus or other defect that might affect any computer system into which it is received and opened. However, it is the responsibility of the recipient to ensure that it is virus free. The sender accepts no responsibility for any loss or damage arising in any way from its use. E-Mail received by or sent from RBC Capital Markets is subject to review by Supervisory personnel. Such communications are retained and may be produced to regulatory authorities or others with legal rights to the information. IRS CIRCULAR 230 NOTICE: TO COMPLY WITH U.S. TREASURY REGULATIONS, WE ADVISE YOU THAT ANY U.S. FEDERAL TAX ADVICE INCLUDED IN THIS COMMUNICATION IS NOT INTENDED OR WRITTEN TO BE USED, AND CANNOT BE USED, TO AVOID ANY U.S. FEDERAL TAX PENALTIES OR TO PROMOTE, MARKET, OR RECOMMEND TO ANOTHER PARTY ANY TRANSACTION OR MATTER.

2 1

[boost.test] 0 return code with expected failures?
by Ahmed Badran 16 Apr '10

16 Apr '10

Hi, I have a binary that runs unit tests, 3 tests fail and these tests I have marked as being expected failures after analysis. The binary however produces a non-zero exit code even with these tests marked as expected failures . Is there a way to have the binary return a zero exit code when all the failures are expected and non-zero when some other non-expected failure happens? The test setup uses automatic test registration. Regards, Ahmed

2 7

BOOST_HAS_RVALUE_REFERENCES and Visual Studio 2010 support
by Marat Abrarov 16 Apr '10

16 Apr '10

As I see Boost C++ Libraries (1.42) doesn't support rvalue references under Visual C++ 10.0 (Visual Studio 2010) - there is no definition of BOOST_HAS_RVALUE_REFERENCES (and BOOST_NO_RVALUE_REFERENCES too) for Visual C++ 10.0. Does anybody know why it is so and when will it be supported? (and will it be so?) Regards, Marat.

1 0

SVG Graphics - to be supported by IE9 - Boost GSoC project?
by Paul A. Bristow 16 Apr '10

16 Apr '10

Some may remember that Jake Voytko worked on a SVG graphic plotting package during a 2007 GSoC - dubbed Boost.Plot. In July 2009, I announced that this was available for people to 'try out' - it seems in a usable condition. Although several people made some kind remarks about it, I sensed that the 'killer' feature was using SVG SVG was *NOT supported 'out-of-the-box'* by Microsoft IE (including 8, to my surprise, and disappointment). It now seems that Microsoft have 'seen' the light' and promise that IE 9 will provide good and portable support for SVG. http://blogs.msdn.com/ie/archive/2010/03/18/svg-in-ie9-roadmap.aspx They have finally realised the 'small is beautiful' applies to graphics - especially now that many are being displayed on phones with limited speed links. SVG graphics need a tiny amount of code, especially when compressed, and can be expanded without 'going all pixelly'. Boost.Plot is special in that it is in C++ and it has a Boost license. It allows you to add just a few lines of code to the end of your C++ program to take data from any STL container (all or part) and produce a plot as a Scale Vector Graph (.svg) file. So it is already suited to sending near real-time plots to phones. BUT while Boost.Plot provides zillions of functions to TechniColor your XY plots, it doesn't do much to help produce other displays - even things as simple as pie charts. And the underlying SVG interface functions are perhaps rudimentary. So I wonder if there is any enthusiasm for a Google Summer of Code project for NEXT summer 2011 to get this into a reviewable state? (Sadly I think we have just missed GSoC for this year). Paul PS A few demo plots are attached for your amusement. The latest version is available on SVN https://svn.boost.org/svn/boost/sandbox/SOC/2007/visualization/ Docs are available to build as html and pre-built as pdf (patience - 6 Mbyte!) https://svn.boost.org/svn/boost/sandbox/SOC/2007/visualization/libs/svg_plot /doc/pdf/svg_plot.pdf or http://tinyurl.com/coqlbg (or ask if you want zips instead). --- Paul A. Bristow Prizet Farmhouse Kendal, UK LA8 8AB +44 1539 561830, mobile +44 7714330204 pbristow(a)hetp.u-net.com

3 3

Has anyone successfully used boost with gcc 4.5.0 (mingw) ?
by Mauricio Gomes 16 Apr '10

16 Apr '10

Hi, My code was running fine with gcc 4.4.0, Mingw and boost. I changed to gcc. 4.5.0 and though it compiles okay it crashes when I try to run my tests. Has anyone successfully used boost with gcc 4.5.0 (mingw) ? Thanks, -- Mauricio Gomes

2 1

[program_options] printing options summary
by Stanisław Findeisen 16 Apr '10

16 Apr '10

[This question is about Boost.program_options library.] When I want to print options summary (e.g., for --help) I do this: cout << optionsDesc where optionsDesc is: boost::program_options::options_description optionsDesc; The output is correct, but how to format it? It looks bad: --mode arg [must be set] [........] mode: 'f' to gener ate file, or 'x' to fix file, or 'p' to gen erate ... Option descriptions are too narrow, and some words are broken right in the middle. (There is a big gap here between "mode" and its description because other option names are quite long.) It would be nice to be able to print wider option descriptions or maybe option descriptions *below* option names and somewhat indented (instead of to the right). Are there any formatting options? Thanks! STF

2 2

[Website] The link to the Wiki points to Trac
by Sébastien Dumont 16 Apr '10

16 Apr '10

Hi, On the Boost homepage at http://www.boost.org/, the link to the Wiki on the right instead points to Trac, is it the intended behaviour? Thanks, Sebastien

2 1

[Iostreams] Problem with filtering_istream and gzip_decompressor with 64bit
by peterbarnabus 16 Apr '10

16 Apr '10

Hi, I am trying to use the iostream gzip filters, and have run into some problems using them with 64bit compilers. I am using OSX 10.6 and my code works just fine with apples gcc-4.2 compilers in both 32 and 64 bit mode. However, with gcc4.4 or gcc4.5 compilers, it runs only in 32bit mode and crashes in 64bit mode. Has anyone run into this issue? Is it a problem with how I am using the iostream library? Here is the code to reproduce: $ g++-mp-4.4 -m64 -g -O0 -o test_iostreams.4.4-64 test_iostreams_64.C -I/opt/local/include/boost/ -I/opt/local/include/ -L/opt/local/lib/ -lboost_iostreams-mt If I run the 64bit executable I get this message (for the 32bit it just echo's the file correctly): $ ./test_iostreams.4.4-64 test_iostreams.4.4-64(38367) malloc: *** error for object 0x100164dc0: pointer being freed was not allocated *** set a breakpoint in malloc_error_break to debug ^CAbort trap #include <iostream> #include <fstream> #include <string> #include <sstream> #include <boost/iostreams/filtering_stream.hpp> #include <boost/iostreams/filter/gzip.hpp> #include <boost/iostreams/device/file.hpp> namespace io = boost::iostreams; using namespace std; void test() { string filename("/tmp/g.dot.gz"); istream *ifs = new io::filtering_istream(); ((io::filtering_istream *) ifs)->push(io::gzip_decompressor()); ((io::filtering_istream *) ifs)->push(io::file_source(filename)); string str; while( std::getline((*ifs), str) ) { std::cout << "read line : " << str << std::endl; } } int main(int argc, char **argv) { test(); return 0; }

1 0

Spirit and on_error
by Michele Caini 16 Apr '10

16 Apr '10

Hi all, someone can explain to me how to use, if it's possible, on_error error handler? I'd like to throw an exception reporting error data, because I'm using spirit in a Qt-based application, and my idea is to catch exception on upper level to pop-up a messagebox or something like that. I start from documentation example, here: on_error<fail> ( xml , std::cout << val("Error! Expecting ") << _4 // what failed? << val(" here: \"") << construct<std::string>(_3, _2) // iterators to error-pos, end << val("\"") << std::endl ); Trying several possible solution, no one compiles fine. I don't know, really, what I have to do, so please help me!! :-) Thanks in advance, Michele

1 1

[Wiki] Please remove spam on Boost.Build V2/GettingStarted page
by Sébastien Dumont 16 Apr '10

16 Apr '10

Hi, There is some spam on the Boost.Build V2/GettingStarted page in the Boost Wiki (http://www.crystalclearsoftware.com/cgi-bin/boost_wiki/wiki.pl?Boost.Build_…) and I cannot edit it, could someone else please remove it ? It is the three "buy XXX online" links at the bottom of the page, below the link to "Boost.Build V2/MicrosoftVCProjMigration". Thanks, Sebastien

1 0

boost and Compact Framework
by Luigi Seregni 16 Apr '10

16 Apr '10

Hello everybody, I'm developing a wearable gesture recongnition system in which I deal with matrix calculation and signal processing. All software must be developed in C++, so I think that Boost is a good choice for matrix calculation (also for signal processing? for example: FFT, wavelet...). Mainly, I'd like to ask you if Boost libraries are compatible with .NET Compact Framework 3.5. Thanks in advance for your reply. Luigi Seregni

5 8

[date_time] howto determine date format?
by Markus Werle 16 Apr '10

16 Apr '10

Hi! With the code below I try to automagically determine the date format found in input files. I'd expect the code below to find the date format "%d.%m.%Y" for "05.02.2008", but I got surprised by obtaining "%m/%d/%Y". A major pain it is with those dates. Whether my shallow knowledge of locales and imbue or boost::date_time (from boost-1.37.0) is to be blamed is beyond my horizon. I feel like date accepts '.' where I said "expect '/'", so I think this should be changed. I may be wrong. Could you please shed some light on the issue? Thanks, Markus #include <boost/assign/list_of.hpp> #include <boost/date_time/posix_time/posix_time.hpp> #include <boost/date_time/gregorian/gregorian.hpp> #include <boost/date_time/local_time/local_time.hpp> #include <boost/foreach.hpp> #include <boost/algorithm/string.hpp> #include <string> #include <list> inline std::string determine_date_format(std::string const & s) { using namespace boost::assign; using namespace boost::gregorian; std::list<std::string> possible_formats = // TODO: add others here! list_of ("%Y-%m-%d")("%Y/%m/%d")("%m/%d/%Y")("%d.%m.%Y"); bool inform_user = false; BOOST_FOREACH(std::string const & format, possible_formats) { if (inform_user) { std::cout << "Trying format '" << format << "' ..." << std::endl; } try { date_input_facet * input_facet = new date_input_facet(format.c_str()); std::istringstream iss(s); iss.imbue(std::locale(iss.getloc(), input_facet)); date d(not_a_date_time); iss >> d; if (!iss.fail() && (!d.is_not_a_date())) { return format; } std::cout << "WARNING: date format '" << format << "' does not match '" << s << "'." << std::endl; inform_user = true; } catch(...) { } } std::cout << "WARNING: date format not recognized. " << "Please reconfigure your measurement equipment " << "to ISO standard output!" << std::endl; return ""; } int main() { std::string the_date = "05.02.2008"; std::string format = determine_date_format(the_date); std::cout << the_date << " has date-time-format " << format << std::endl; return 0; }

2 1

Monitoring Active Threads in Boost
by Weide Zhang 16 Apr '10

16 Apr '10

Does any one has experience in the monitoring number of currently running active threads ? We used boost thread and allocate around 100 threads. We are interested to know at certain time point, how many threads are actively serving. Thanks a lot for the help, Weide

1 0

error in "make install"
by mahmoodn 15 Apr '10

15 Apr '10

Hi, I can not install boost libraries. Here is the output of my commands: mahmood@magma:boost_1_36_0$ pwd /home/mahmood/flexus-3.0.0/boost_1_36_0 mahmood@magma:boost_1_36_0$ ./configure Building Boost.Jam with toolset gcc... tools/jam/src/bin.linuxx86/bjam Detecting Python version... 2.6 Detecting Python root... /usr Unicode/ICU support for Boost.Regex?... not found. Generating Boost.Build configuration in user-config.jam... Generating Makefile... mahmood@magma:boost_1_36_0$ make install ./tools/jam/src/bin.linuxx86/bjam --user-config=user-config.jam --prefix=/usr/local --exec-prefix=/usr/local --libdir=/usr/local/lib --includedir=/usr/local/include install error: at /home/mahmood/flexus-3.0.0/boost_1_36_0/tools/build/v2/build/project.jam:843 error: duplicate initialization of gcc with the following parameters: error: version = 4.4.1 error: previous initialization at /home/mahmood/flexus-3.0.0/boost_1_36_0/tools/build/v2/build/project.jam:843 Not all Boost libraries built properly. thanks for any idea... -- View this message in context: http://old.nabble.com/error-in-%22make-install%22-tp28256377p28256377.html Sent from the Boost - Users mailing list archive at Nabble.com.

2 2

Multi-threaded Debug DLL and boost 1.42
by V.V. 15 Apr '10

15 Apr '10

I have a simple code that uses the boost date/time library. I can compile it and run it with Multi-threaded Debug DLL (/MDd) switch and boost v 1.38. However, when I switch to boost v. 1.42, I cannot run it ("The system cannot execute"). The only way how I can run it with boost 1.42 is if I recompile it with /MTd switch (Multi-threaded Debug). I am probably doing something silly that has nothing to do with boost 1.38 vs 1.42 but I can't find out what it is. I am using VC++ 2005 and I installed both versions of boost from Boost Consulting. Thanks. -- View this message in context: http://old.nabble.com/Multi-threaded-Debug-DLL-and-boost-1.42-tp28259124p28… Sent from the Boost - Users mailing list archive at Nabble.com.

1 0

Boost::Thread referenced to a MFC regular dll, assertion error occur while loading this dll
by DDGG 15 Apr '10

15 Apr '10

Hello everyone! I created a new VC2008 MFC regular dll project, do nothing but insert a line in stdafx.h: #include <boost/thread.hpp> Then I exported a do-nothing function at the dll's head file: extern "C" __declspec(dllexport) void DllFunc() { } After I compiled the proejct, I got a dll file and a lib file. I created a MFC dialog project, implicit call to the dll, that's: 1) #include the dll's head file 2) use #pragma comment(lib, "...") to import the dll's lib file 3) make a call to the DllFunc in dll I run the dialog project in the debug mode, and got an assertion error: void AFXAPI AfxCoreInitModule() { ASSERT(AfxGetModuleState() != AfxGetAppModuleState()); // assertion error // the return value of AfxGetModuleState() and AfxGetAppModuleState() are both not-empty, // but they are not the same. ... } Could anybody help me? thanks! My boost version is 1.38, 1.42 also tried. Compiler: Microsoft VC2008 (SP1)

2 2

Boost 1.33.1 - 64bit static libraries with -fPIC (gcc)
by Nicholas Yue 15 Apr '10

15 Apr '10

Hi, I have a need to build Boost 1.33.1 [this is to match a legacy system which was supplied to us by an external party] as 64bit static libraries with the -fPIC option enabled. I know that the shared libraries are built with -fPIC but my linkage of the static libraries from 1.33.1 indicates that they are not build with -fPIC Does anyone have suggestion as to how best to enable PIC in Boost 1.33.1 static libraries? e.g. Jam files ? I tried modifying the Jam files but didn't work out for me. Regards

2 1

[Accmulators][ConceptCheck]: Many warnings for constructing accumulator with density
by Roland Bock 15 Apr '10

15 Apr '10

Hi, the following line results in several kB of warnings: accumulator_set<double, stats<tag::density > > acc(tag::density::cache_size=10, tag::density::num_bins=5); include/boost/concept_check.hpp:335: warning: non-static reference 'const double& boost::UnaryFunction<boost::numeric::functional::as_min<const double, void>, double, const double&>::arg' in class without a constructor gcc-4.2.4, boost-1.41 Am I doing something wrong? Or is there a way to avoid these warnings (other than to turn off warnings)? Regards, Roland

1 1

Boost.Asio thread pool - add/remove threads at runtime
by Vance Grkov 15 Apr '10

15 Apr '10

I am creating a simple task and timer thread pool using Boost.Asio. I am searching for the recommended way to dynamically add and remove threads to the thread pool. I don’t want to have to queue up tasks most of the time, only when the thread count gets very high (100s) queuing is ok, also I want for the thread count to go down to example 5 threads when there is no more work presented to the thread pool. This is because some of the tasks can take some time to complete and I don't want to hold off other tasks when computer resource are still available. Basically this is the solution I have in mind now. Given the following configuration values: gInitialThreadPoolSize = 4; gMaximumThreadPoolSize = 1024; gNumberOfThreadsDoingWork = 0; And 2 events: HANDLE moreWorkAvailable; HANDLE exit; Create a thread pool using this worker function: void ThreadWorkerFunction(boost::asio::io_service *io, boost::thread &thread) { for (;;) { HANDLE objects[] = { moreWorkAvailable, exit }; errorCode = WaitForMultipleObjects(objects) if (errorCode == WAIT_OBJECT_0) { // More work is available, lets start processing... gNumberOfThreadsDoingWork++; io->run(); gNumberOfThreadsDoingWork--; // When all work has been processed, go back to the original thread pool size if (threads.size() < gInitialThreadPoolSize ) { threads.remove(thread); break; } } else if (errorCode == WAIT_OBJECT_1) { threads.remove(thread); break; } } } This is now the thread pool is created: std::vector<boost::shared_ptr<boost::thread> > threads; for (std::size_t i = 0; i < gInitialThreadPoolSize; ++i) { boost::shared_ptr<boost::thread> thread(new boost::thread( boost::bind(&ThreadWorkerFunction, &io, thread) )); threads.push_back(thread); } Next every time a task is inserted into the queue we check if all worker threads are busy, and in case they are busy, create a new thread if (threadsDoingWork == threads.size()) { boost::shared_ptr<boost::thread> thread(new boost::thread( boost::bind(&worker, &io) )); threads.push_back(thread); } SetEvent(moreWorkAvailable); Also in the ThreadWorkerFunction(...) function, after io->run() returns, we can check if more than N threads are idle and keep exiting until we get at minimum. I would appreciate if you can let me know if there is some better and more simpler way to achieve this than implementing this myself. I am new to Asio so I might have overlooked something. _________________________________________________________________ Hotmail: Trusted email with powerful SPAM protection. https://signup.live.com/signup.aspx?id=60969

2 2

[interprocess] ARM atomic operations problem.
by Ivan Dundek 15 Apr '10

15 Apr '10

Hi all. I've tried to test the boost IPC communication using: - boost::interprocess::shared_memory_object - boost::interprocess::mapped_region - boost::interprocess::interprocess_mutex - boost::interprocess::interprocess_condition So I created shared memory, and when the first process put the data into the shared memory, call the notify_one() method, to let the second process know, taht there are data in the shared memory. Everything is OK, when I'm using gcc 4.4.1 on linux. But when I tried to cross-compile the sources using arm-linux toolchain, which is based on gcc 3.3.2, I'm always geting error: "#error No atomic operations implemented for this platform, sorry!" I know, that if I will use gcc 4 and above, it will works. But is there any workaround or fix, how to compile boost::interprocess on gcc 3.3.2? Thank you for your advices. Dundee.

2 2

[Spirit] questions about on_error and expectation points
by philip tucker 15 Apr '10

15 Apr '10

I have attached a code fragment (no driver) and a gcc error message. Please refer to the attached code. There, I ask three questions: - Why won't > compile where I expect it to? - Why are parentheses necessary in an expectation operator expression? - How can I detect and report an error in a particular case?

1 0

[Chrono]
by Roland Bock 14 Apr '10

14 Apr '10

Hi, forgive me for asking the obvious, but I fail to see how to get timing information from the thread_clock? I can call thread_clock::now() to get time_point objects, e.g. boost::chrono::thread_clock threadClock; boost::chrono::thread_clock::time_point start = threadClock.now(); [...] boost::chrono::thread_clock::time_point end = threadClock.now(); But how do I get to the actual CPU milliseconds (or other units?) used by the current thread between end and start? Thanks and regards, Roland

2 2

Please help with enable_if problem
by John Dlugosz 14 Apr '10

14 Apr '10

I'm getting tons of this from Microsoft's compiler: error C2893: Failed to specialize function template 'enable_if<boo... Reading the compiler docs, C2893 gives an example occurs because f's template parameter T is deduced to be std::map<int,int>, but std::map<int,int> has no member data_type (T::data_type can not be instantiated with T = std::map<int,int>.) but isn't that the whole point of using enable_if? I'm using it already in my project and understand the idea behind it. Here is the function in question: template <typename T, typename D> typename enable_if< boost::mpl::and_< std::tr1::is_base_of<generic_linear_time_ntbase, T>, boost::mpl::or_< is_dimensional_time<D>, std::tr1::is_same<duration,D>, std::tr1::is_same<linear_duration,D> > >, T>::type& operator+= (T& left, const D& right) { left.addop_ (right); // real implementation is in the generic base class return *this; // but I need this template to return the correct derived (actual) class. } Basically, I want to implement operator+= in a base class, but actual use is through derived classes of the common base. Rather than repeating a half dozen forms in each class that calls the common base and downcasts the return value, I made the real implementation in a named function, and this stand-alone function that calls it. enable_if is used to make this += present only for left arguments that are derived from the class of interest, and a right argument that is two specific classes or otherwise noted with the predicate. I've successfully used the predicate (derives from true_type or false_type) in other uses of enable_if. I've even mixed boost::mpl::or_ and and_ with the compiler-supplied TR1 before, with something quite similar. Here's one that does work: template <typename T, typename D> typename enable_if< boost::mpl::and_<is_Universal_time_API<T>, boost::mpl::or_<is_Universal_duration_API<D>,is_dimensional_time<D> > >, T>::type operator+ (const T& t1, const D& d1) { T temp (t1); temp += d1; return temp; } My predicates are based on the native TR1's true_type/false_type. Thanks, --John TradeStation Group, Inc. is a publicly-traded holding company (NASDAQ GS: TRAD) of three operating subsidiaries, TradeStation Securities, Inc. (Member NYSE, FINRA, SIPC and NFA), TradeStation Technologies, Inc., a trading software and subscription company, and TradeStation Europe Limited, a United Kingdom, FSA-authorized introducing brokerage firm. None of these companies provides trading or investment advice, recommendations or endorsements of any kind. The information transmitted is intended only for the person or entity to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipient is prohibited. If you received this in error, please contact the sender and delete the material from any computer.

2 2

Problem using boost::bind
by Iskandar Prins 14 Apr '10

14 Apr '10

Hi, Im trying to use boost::bind with 2 parameters on a member function, bind(&Foo::bar, this, _1, _1)); but somehow this fails compilation. Whats the proper syntaxis? Greets, Iskandar

3 3

Re: [Boost-users] [future] [Visual Studio 8.0] [1.42.0] Include File compiler failure
by Robert Douglas 14 Apr '10

14 Apr '10

Sorry to reply to my own post, but I found a solution, though it requires a code change to boost: struct all_futures_lock { unsigned count; boost::scoped_array<boost::unique_lock<boost::mutex> > locks; all_futures_lock(std::vector<registered_waiter>& futures): count(static_cast<unsigned>(futures.size())),locks(new boost::unique_lock<boost::mutex>[count]) { for(unsigned i=0;i<count;++i) { locks[static_cast<std::ptrdiff_t>(i)]=boost::unique_lock<boost::mutex>(futures[i].future->mutex); } } void lock() { boost::lock(locks.get(),locks.get()+count); } void unlock() { for(unsigned i=0;i<count;++i) { locks[static_cast<std::ptrdiff_t>(i)].unlock(); } } }; Note the 3 static casts, the first is to avoid a warning, and the second two are to explicitly convert the unsigned variable to std::ptrdiff_t. VS 8.0 file "Microsoft Visual Studio 8\VC\include\crtdefs.h" line 516 defines ptrdiff_t as being "_w64 int" type. Thus, the T& scoped_array<T>::operator[](std::ptrdiff_t i) const function has an argument mismatch with unsigned. I realize that unsigned should convert to int just fine, so I'm not sure if this is a compiler issue or not. First Question: Is there anyone with a bit more experience on implicit conversions who can shed some light on whether or not the unsigned should be implictly converted to int, or whether a default function should be matched? Other question, is where is this *other* function coming from? Looking through the preprocessed file, I cannot find any other places where there is a operator[] being used on a scoped_array of any type. Second Question: Is is safe for me to change this header file, and build against it, while linking against the libraries which were built without this change? If not, can anyone suggest a better way to achieve this without having to modify the boost header? Thanks! -RD

1 0

Re: [Boost-users] [Boost.mpi] Installation with Intel compilers (solved)
by Federico Golfrè Andreasi 14 Apr '10

14 Apr '10

The fix you suggested me worked well ! Thank you !!! Date: Mon, 12 Apr 2010 10:17:11 -0600 > From: "Belcourt, Kenneth" <kbelco(a)sandia.gov> > > You could try to edit mpi.jam around line 221 like this: > > if $(otherflags) { > for unknown in $(unknown-features) > { > result += "$(unknown)$(otherflags:J= )" ; > } > } > >

1 0

math round() functions: away from 0
by Hicham Mouline 14 Apr '10

14 Apr '10

Hello,boost/trunk/libs/math/doc/sf_and_dist/html/math_toolkit/utils/rounding/round.html says that: Halfway cases are rounded away from zero, regardless of the current rounding direction.This is compatible with C99 TC3 and therefore the latest C++1x draft.However, when I ran this program:#include <cmath>#include <iostream>#include <boost/math/special_functions/round.hpp>inline double round1(double x){ if (x >= 0.0) return std::floor(x + 0.5); else return std::ceil(x - 0.5);}inline double round2(double x){ return std::floor(x + 0.5);}int main(){ std::cout.setf(std::ios_base::fixed, std::ios_base::floatfield); std::cout.precision(1); std::cout<< "d floor/ceil.5 floor.5 boostmathround"<<std::endl; for (double d=-10.5; d<11; d+=0.5) std::cout<< d<<" "<< round1(d)<<" "<<round2(d)<<" "<< boost::math::iround<double>(d)<<std::endl; return 0;}under g++4.3.x and msvc2008 with trunk, the output for all the negative halves does not seem to be away from 0.The same for boost::math::round<double>(d)This stuff most likely depends on the bit pattern, so I investigated further. I raised the precision of std::cout to 18 decimals.I then rounded this:const double dd = -10.5;which yieldedd floor/ceil.5 floor.5 boostmathround-10.500000000000000000 -11.000000000000000000 -10.000000000000000000 -10and for (double d=-10.6; d<-10.4; d+=0.01) std::cout<< d<<" "<< round1(d)<<" "<<round2(d)<<" "<< boost::math::iround(d)<<std::endl;-10.600000000000000000 -11.000000000000000000 -11.000000000000000000 -11-10.590000000000000000 -11.000000000000000000 -11.000000000000000000 -11-10.580000000000000000 -11.000000000000000000 -11.000000000000000000 -11-10.570000000000000000 -11.000000000000000000 -11.000000000000000000 -11-10.560000000000000000 -11.000000000000000000 -11.000000000000000000 -11-10.550000000000001000 -11.000000000000000000 -11.000000000000000000 -11-10.540000000000001000 -11.000000000000000000 -11.000000000000000000 -11-10.530000000000001000 -11.000000000000000000 -11.000000000000000000 -11-10.520000000000001000 -11.000000000000000000 -11.000000000000000000 -11-10.510000000000002000 -11.000000000000000000 -11.000000000000000000 -11-10.500000000000002000 -11.000000000000000000 -11.000000000000000000 -11-10.490000000000002000 -10.000000000000000000 -10.000000000000000000 -10-10.480000000000002000 -10.000000000000000000 -10.000000000000000000 -10-10.470000000000002000 -10.000000000000000000 -10.000000000000000000 -10-10.460000000000003000 -10.000000000000000000 -10.000000000000000000 -10-10.450000000000003000 -10.000000000000000000 -10.000000000000000000 -10-10.440000000000003000 -10.000000000000000000 -10.000000000000000000 -10-10.430000000000003000 -10.000000000000000000 -10.000000000000000000 -10-10.420000000000003000 -10.000000000000000000 -10.000000000000000000 -10-10.410000000000004000 -10.000000000000000000 -10.000000000000000000 -10-10.400000000000004000 -10.000000000000000000 -10.000000000000000000 -10-10.5 has the exact representation in IEEE754 as the 64bit:0000000000000000000000000000000000000000000000001010010000000011with, accross all the bits (not bytes), the least significant first.It is an _exact_ representation as far as I can tell.therefore the round function should round _away_ from 0, to give -11, shouldn't it?round1() however seems to do the right thing....Regards,

2 1

[Filesystem] Locking files
by Adam Badura 14 Apr '10

14 Apr '10

Is it possible to lock a file with Boost.Filesystem to prevent its deletion, writing or reading? Adam Badura

4 6

enable_if help
by John Dlugosz 13 Apr '10

13 Apr '10

I need to amend my last post (which I can't reply to since it's not showing up on the list yet). The operator+ example doesn't work either. I just didn't notice since it uses +=. I realized that after I posted, and tried testing that separately. However, it gives a different error. It's a more ordinary "no operator found which takes..." which is typical of getting the enable_if wrong so it's not enabled or arguments can't be deduced. So now I'm wondering if the trouble is the and/or. I had assumed that the true_type/false_type were compatible between MPL and the native TR1, since it boils down to "type" and "value". But now I'm thinking that the templates work by mentioning those specific classes. The enable_if and disable_if have proven to work with the native TR1 tests and my own which use the native true/false_type. So I assumed that precautions were taken to interoperate. Maybe the same isn't true with and_ and or_ ? The underlying issue is that TR1 took much of type_traits, but not the composition of primitives. Plauger appears to have an "and" he uses internally, but no "or". If you think that's the trouble, is there something like the _c form that might work with the underlying types? Or maybe I'm barking up the wrong tree; after all, enable_if works fine. --John TradeStation Group, Inc. is a publicly-traded holding company (NASDAQ GS: TRAD) of three operating subsidiaries, TradeStation Securities, Inc. (Member NYSE, FINRA, SIPC and NFA), TradeStation Technologies, Inc., a trading software and subscription company, and TradeStation Europe Limited, a United Kingdom, FSA-authorized introducing brokerage firm. None of these companies provides trading or investment advice, recommendations or endorsements of any kind. The information transmitted is intended only for the person or entity to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipient is prohibited. If you received this in error, please contact the sender and delete the material from any computer.

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[function] Boost.Function won't compile under Borland DevStudio 2006
by Fábio 'Petrucio' Stange 13 Apr '10

13 Apr '10

I've just recently learned about boost::function when reading Effective C++, and I was thrilled about it. This is the simple code I'm trying to implement: typedef boost::function1<void, boost::shared_ptr<VarSpeedObject> > ObjectDoneCallback; void SomeFunction(ObjectDoneCallback callback, ...) { // Some code callback(...); } When trying to compile it under C++ Builder 2006 (I have no other choice but to use this in the current project), I get the following error: [C++ Error] function_template.hpp(904): E2131 Objects of type 'detail::function::basic_vtable1<void,shared_ptr<VarSpeedObject> >' cannot be initialized with { } On this line in function_template.hpp: static vtable_type stored_vtable = { { &manager_type::manage }, &invoker_type::invoke }; Can I circumvent this somehow to make it compile under my environment? Thanks, Petrucio

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