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Vertex properties in BGL
by Ralph Wessel 01 Aug '04

01 Aug '04

I would like to use the BGL for a project I'm working on, but I haven't been able to find a particular piece of information. The system I'm modeling can be easily represented by a directed graph, but it seems that an essential vertex property can only be calculated on the fly based on the current in-edge and out-edge as the graph is traversed. Can this be supported in the BGL in a way which can feed this vertex property to the supplied algorithms?

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[HELP]How can I print a name of a node in a graph?
by Daniele Carlucci 01 Aug '04

01 Aug '04

Hi everybody, I wanna to print a graph but instead the id I want to print the name of the same. How can I make? I have token the list of the nodes from a list i. In i.name I have the name of the node. The code that I used to initialize the graph is: template <class Graph> void print(Graph& g) { typename Graph::vertex_iterator i, end; typename Graph::out_edge_iterator ei, edge_end; for(boost::tie(i,end) = vertices(g); i != end; ++i) { if (*i!=0){ cout<< *i << " --> "; for (boost::tie(ei,edge_end) = out_edges(*i, g); ei != edge_end; ++ei) cout << target(*ei, g) << " "; cout << endl;} } } void Main() { int nodo, cont, a; nodo=1; typedef graph_traits < file_dep_graph >::vertices_size_type size_type; size_type n_vertices; //Setta n_vertices con il numero di nodi n_vertices=id; // legge il numero di nodi file_dep_graph g(n_vertices); for (i=list.begin(); i != list.end(); ++i) { size_type k; for (cont=0; cont<(*i).v.size(); cont++) { a=(*i).v[cont]; //Connection between node "cont" and all the other nodes add_edge((*i).PID, a, g); } } print(g); Thanks Daniele

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Re: Way to print a route between two nodes
by Gustavo Sÿffffe1nchez 01 Aug '04

01 Aug '04

I don't know exactly how you are traversing those nodes in the path, - ie how do find the path -, but as far as I know you have to use a visitor with an algorithm such as dijisktra shortest paths, so you define the event point, on_finish_vertex for example where you want the visitor to be called. This algorithm also stores in a vector the minimum weight pahts encountered from an specific origin vertex so you can go over those paths from the last vertex to this origin. Hope to be of help ------------------------------ Message: 10 Date: Thu, 29 Jul 2004 15:33:34 +0200 From: Daniele Carlucci Subject: [Boost-users] Way to print a route between two nodes To: boost-users(a)lists.boost.org Message-ID: <4108FCAE.8040301(a)email.it> Content-Type: text/plain; charset=us-ascii; format=flowed Hi all, there is a way to print a route between two nodes? If I have for ie: 8 nodes. A possible route is 1->3->2->6->8 How can I print it? I have only seen that it's used the way to print for every node, all the nodes near that one. Thanks Daniele ------------------------------ ---------------------------------

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serialization for indexed_set?
by Jedediah Smith 01 Aug '04

01 Aug '04

I'm trying to write generic boost::serialization functions for boost:indexed_set and I'm in a bit over my head. The serialization docs say to use something like the following for generic types: template<class Archive, class T> inline void save( Archive & ar, const std::auto_ptr<T> &t, const unsigned int file_version ){ ar << t.get(); } This is a non-intrusive save function for std::auto_ptr. The tricky thing is that the template parameters for indexed_set are much more complicated and the default index may either be regular (set-like) or sequenced (list-like). How would this be handled?

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boost for visual c++
by Jean-Michel besnard 01 Aug '04

01 Aug '04

Hi, How can I install the lib boost::random to use it within Visual C++ (6) ? Is there a built library to be downloaded somewhere or do I have to build it myself ? JM

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std::map(pair) and boost::bind
by Vytautas Leonavicius 30 Jul '04

30 Jul '04

I am often facing the same thing again and again. Say I have a map: map< int, Foo* > m; and I would like to invoke method of Foo on all instances std::for_each(m.begin(), m.end(), boost::bind(&Foo::method, _1 ); The problem is that map contains pair of key and value, not Foo*. Usually I create some function taking pair and invoking method needed on .second. But maybe there is another way to do that? Thanks! Vytautas

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RE: [Boost-users] Re: Bjam- racking my brain
by Brian Braatz 29 Jul '04

29 Jul '04

> Brian Braatz wrote: > > >> Rene Rivera Wrote: > >>build/v2 is not used for building Boost. It's the experimental, and > > > > I am sorry - I am confused and am trying to find my way out: > > > > *- What is listed for download on sourceforge does not reference a > > version of build v1 or bjam v1 or what have you. ( I am confused as to > > how to get the older version) > > OK, some explanation... In SF there are 2 downloads: boost-build-2.0-* > and boost-jam-3.1.*. That boost-build-2.0 is the version 2 I mentioned > which is the experimental version. boost-jam-3.1.* is the scripting > engine BJam (based on Perforce Jam & FreeType Jam) that both V1 and V2 > run on top of. > (snip) Just wanted to thank you Rene for helping me get my head straight on this. I am compiling now with Boost.Build. I have run into another issue that I will be posting on the bjam list (thank you for pointing me to that), but life is definitely nicer. Boost is awesome all by itself, but without the support of the community for those of us getting our heads around these things, boost would not be able to grab more users.

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boost lambda
by Mattias Brändström 29 Jul '04

29 Jul '04

Hello! I am new to the boost lambda library so this might be a naive question. Here goes. This is what I want to do: class Foo { public: int bar() { return 42; } }; int main() { std::vector<Foo> v; v.push_back(Foo()); count_if(v.begin(), v.end(), boost::bind(&Foo::bar, _1) == 42); return 0; } However, I get a comilation error when trying to compile this with g++ version 3.3.2: test.cpp: In function `int main()': test.cpp:17: error: no match for 'operator==' in '`empty_class_expr' not test.cpp:17: sorry, unimplemented: supported by dump_expr test.cpp:17: sorry, unimplemented: boost::bind(R (T::*)(), A1) [with R = int, T = Foo, A1 = boost::arg<1>]((<unnamed>::_1, <expression error>)) == 42' To me it seems that this is something that I should be able to do with the BLL. If someone could point me in the right direction here I would be really greatful! Thanks in advance! Regards, Mattias

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Error Linking Boost Example
by Yuen, Samuel 29 Jul '04

29 Jul '04

Hello folks, I am trying to use boost here and I keep getting the following error when trying to compile dates_as_strings.cpp example: Prelinker invoked. Parsing line from ld: Prelink undefined symbol: get_month_map_ptr__Q25boost9gregorian10greg_monthXv Prelink undefined symbol: _ZTVSt9exception Prelink undefined symbol: _ZTVSt11logic_error Prelink undefined symbol: _ZNSt6localeD1Ev Prelink undefined symbol: _ZNSspLEc Prelink undefined symbol: _Znwm Prelink undefined symbol: _ZNSt11logic_errorD2Ev Prelink undefined symbol: __register_frame_info_table Prelink undefined symbol: __deregister_frame_info Prelink undefined symbol: _ZSt9use_facetISt5ctypeIcEERKT_RKSt6locale Prelink undefined symbol: _ZNKSs2atEm Prelink undefined symbol: _ZNKSs6lengthEv Prelink undefined symbol: _ZNSt6localeC1EPKc Prelink undefined symbol: _ZNSsC1Ev Prelink undefined symbol: _ZNSt12out_of_rangeC2ERKSs Prelink undefined symbol: _ZNSt8ios_base4InitD1Ev Prelink undefined symbol: _ZNSt8ios_base4InitC1Ev Prelink undefined symbol: _ZNSt24__default_alloc_templateILb1ELi0EE10deallocateEPvm Prelink undefined symbol: _ZNSt24__default_alloc_templateILb1ELi0EE8allocateEm Prelink undefined symbol: _ZNKSs7compareERKSs Prelink undefined symbol: _ZNKSt9type_infoeqERKS_ Prelink undefined symbol: __cxa_end_catch Prelink undefined symbol: __cxa_rethrow Prelink undefined symbol: __cxa_begin_catch Prelink undefined symbol: _ZNSsC1ERKSs Prelink undefined symbol: _ZNSsD1Ev Prelink undefined symbol: _ZNSsaSERKSs Prelink undefined symbol: _ZNSsaSEPKc Prelink undefined symbol: _ZNSaIcED1Ev Prelink undefined symbol: _ZNSsC1EPKcRKSaIcE Prelink undefined symbol: _ZNSaIcEC1Ev Prelink undefined symbol: _ZNSt9exceptionD2Ev Prelink undefined symbol: __cxa_throw Prelink undefined symbol: __cxa_allocate_exception Prelink undefined symbol: _Unwind_Resume Prelink undefined symbol: _ZdlPv Prelink undefined symbol: __gxx_personality_v0 Prelink undefined symbol: __cxa_pure_virtual Prelink undefined symbol: _ZTISt11logic_error Prelink undefined symbol: _ZNKSt11logic_error4whatEv Prelink undefined symbol: _ZTVN10__cxxabiv117__class_type_infoE Prelink undefined symbol: _ZTVN10__cxxabiv120__si_class_type_infoE Prelink undefined symbol: as_long_string__CQ25boost9gregorian12greg_weekdayXv Prelink undefined symbol: as_long_string__CQ25boost9gregorian10greg_monthXv Prelink undefined symbol: as_short_string__CQ25boost9gregorian10greg_monthXv ld: Unresolved: boost::gregorian::greg_month::get_month_map_ptr(void) boost::gregorian::greg_weekday::as_long_string(void) const boost::gregorian::greg_month::as_long_string(void) const boost::gregorian::greg_month::as_short_string(void) const The compiler command is: cxx -I/desenv/syuen/tmp/boost_1_31_0 -L/desenv/syuen/tmp/boost_1_31_0/stage/lib -lboost_date_time-gcc-mt-d-1_31 -pthread -o dates_as_strings -D__USE_STD_IOSTREAM -ptv -ptr ./cxx_repository dates_as_strings.cpp The compiler version is: >cxx -V Compaq C++ V6.5-014 for Compaq Tru64 UNIX V5.1A (Rev. 1885) Compiler Driver V6.5-014 (cxx) cxx Driver I have compiled the library using gcc compiler set: export GXX="g++ -pthread" bjam "-sTOOLS=gcc" stage I would appreciate any help. Regards, > Samuel Yuen > System Analyst - PDC > Atos Origin > Rua Itapaiuna 2434 São Paulo / SP > Brazil > Phone +55 (11) 2183-2035 > Mobile +55 (11) 8112-6361 > Fax + 55 (11) 2183-2113 > samuel.yuen(a)atosorigin.com > www.atosorigin.com > > This e-mail and the documents attached are confidential and intended > solely for the addressee; it may also be privileged. If you receive this > e-mail in error, please notify the sender immediately and destroy it. > > As its integrity cannot be secured on the Internet, the Atos Origin > groupliability cannot be triggered for the message content. Although the > sender endeavours to maintain a computer virus-free network, the sender > does not warrant that this transmission is virus-free and will not be > liable for any damages resulting from any virus transmitted. >

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Re: [Boost-users] Running boost::thread compiled on w2k on XP
by Paul Grenyer 29 Jul '04

29 Jul '04

Hi > Is it impossible to compile the boost libraries on > windows 2000 and then expect the created dll:s to work on windows XP? No. It is not impossible. We have done exactly that without any problem at all. We didn't have to do anything special either. We used VC7.1 on Windows 2000, just as you are. I know that's not much practiacl help, but at least you now know it can be done. Regards Paul Paul Grenyer Email: paul(a)paulgrenyer.co.uk Web: http://www.paulgrenyer.co.uk Have you met Aeryn: http://www.paulgrenyer.co.uk/aeryn/? Version 0.3.0 beta now available for download.

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Running boost::thread compiled on w2k on XP
by Ragnar Ouchterlony 29 Jul '04

29 Jul '04

I have tried compiled boost::thread for windows using visual c++ from the visual studio .net 2003 suite. It compiles fine and I can compile things with the created libraries. However, when I move my program and the boost::thread dll:s from windows 2000 to another machine running windows XP, the program just prints out a blank line and exits without any other message. Attached is a program I have used to test out that it is this that is wrong. What have I done wrong? Is it impossible to compile the boost libraries on windows 2000 and then expect the created dll:s to work on windows XP? If this is the case, where can I get hold of the boost::thread libraries for vc71 compiled specifically for windows XP? If not, what could be wrong? /Ragnar Ouchterlony

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uBLAS syntax issues
by Nicholas Andrews 29 Jul '04

29 Jul '04

Here's the formula I want to reproduce in uBLAS: K=P*Mt*(M*P*Mt+R)^-1 Where K, P, M, and R are matrices, and Mt is the transpose of M. I have written the following function: void multi_state_kf::compute_gain(const matrix<double>& dev) { matrix<double> temp=prod(M,newP); matrix<double> transM=trans(M); matrix<double> A=(prod(temp,transM)+dev); permutation_matrix<size_t> pm(A.size2()); lu_factorize(A, pm); matrix<double> el = prod(newP,transM); lu_substitute(A, pm, el); K=el; } This function was completely hacked together as I'm new to uBLAS (and rusty with linear algebra), but it got rid of most of my compile errors. Now only a few remain but I'm not sure what I'm doing wrong. I'm hoping that it will be obvious to someone here. Thanks for your help, Nick

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Assign and MultiArray conflict with precompiled headers
by Bruno Martínez Aguerre 28 Jul '04

28 Jul '04

Hi. I'm trying out the recently accepted Assign library, and also the MultiArray library, which is new to me. I'm in VC7.1, and using the post review version of Assign. Depending on the order I include the libraries in my precompiled header, the linker complains about double definition of MultiArray's extents object. Here are the files that reproduce the problem. //stdafx.h #pragma once #include "boost/multi_array.hpp" #include "boost/assign.hpp" //main.cpp #include "stdafx.h" int main() { boost::multi_array<int, 2> t(boost::extents[3][4]); } I couldn't find relation between the two libraries. Thanks in advance, Bruno Martínez

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Date Time lib and time_t
by Matt Schuckmann 28 Jul '04

28 Jul '04

Has anybody ever implimented a to_time_t function/method for the ptime class to create a time_t from a ptime. I tried doing it similar to the way from_time_t does it but I'm not getting the right answer. It's nice that you can convert from a time_t for use with legacy code but sometimes you need to go back the other way. Herer is my to_time_t function that does not appear to be working inline std::time_t to_time_t(ptime t) { if( t == neg_infin ) return 0; else if( t == pos_infin ) return LONG_MAX; ptime start(gregorian::date(1970,1,1),time_duration(0,0,0)); return (t-start).total_seconds(); } Thanks,

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RE: [Boost-users] Re: Running boost::thread compiled on w2k on XP
by Paul Rose 28 Jul '04

28 Jul '04

This also isn't exactly what you are looking for, but I took built your test.cpp on vc7.1 running on windows XP using boost 1.31 (also built with vc7.1 running on windows XP). Both the debug (using boost_thread-vc71-mt-gd-1_31.dll) and the release (using boost_thread-vc71-mt-1_31.dll) builds of test.cpp worked fine. My boost dlls were built with all default settings (except I used the alternate namespace hack for boost::signals since we also use Qt). I don't have a boost 1.31 built on win2k to try. > >Perhaps I should add that I am using version 1.31 of boost. I have also >discovered that it seems (it might be an illusion, you never know) to work >when I compile against boost_thread-vc71-mt-gd-1_31.lib, but not against >the release lib boost_thread-vc71-mt-1_31.lib. >/Ragnar Ouchterlony _________________________________________________________________ Overwhelmed by debt? Find out how to Dig Yourself Out of Debt from MSN Money. http://special.msn.com/money/0407debt.armx

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[boost.build] Patch for python.jam
by Markus Schöpflin 28 Jul '04

28 Jul '04

Hello, attached is a patch for pyhton.jam which allows to use python installation on Unix which have been configured with different prefix and exec-prefix. Currently this is not supported by boost.build. The patch simply adds the missing include directory to the compiler command line as recommended in http://www.python.org/doc/2.3.4/api/includes.html . After applying the patch you can either use bjam -sPYTHON_ROOT=<prefix> or bjam -sPYTHON_ROOT=<prefix> -sPYTHON_EXEC_ROOT=<exec prefix> Markus --- net/src/orig/boost_1_31_0/tools/build/v1/python.jam 2004-01-28 23:52:25.000000000 +0100 +++ local/src/boost_1_31_0/tools/build/v1/python.jam 2004-07-28 16:15:37.000000000 +0200 @@ -118,7 +118,7 @@ { PYTHON_ROOT ?= /usr/local ; PYTHON_ROOT = $(PYTHON_ROOT:J=" ") ; - PYTHON_INCLUDES ?= $(PYTHON_ROOT)/include/python$(PYTHON_VERSION) ; + PYTHON_INCLUDES ?= $(PYTHON_ROOT)/include/python$(PYTHON_VERSION) $(PYTHON_EXEC_ROOT)/include/python$(PYTHON_VERSION) ; PYTHON_LIB_PATH ?= $(PYTHON_ROOT)/lib/python$(PYTHON_VERSION)/config ; PYTHON_PROPERTIES ?=

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RE: [Boost-users] Re: Bjam- racking my brain
by Brian Braatz 28 Jul '04

28 Jul '04

> > Brian Braatz wrote: > > > Any help would be appreciated, tomorrow afternoon I am going to go back > > at it, and this time I might "get all medieval" about things :) > Rene Rivera Wrote: > build/v2 is not used for building Boost. It's the experimental, and > under development, next version of Boost.Build. If you plan on using > BBv2 read its separate documentation at > boost-root/tools/build/v2/index_v2.html I am sorry - I am confused and am trying to find my way out: *- What is listed for download on sourceforge does not reference a version of build v1 or bjam v1 or what have you. ( I am confused as to how to get the older version) * when I build the code in jam_src and run it- it reports: Boost.Jam Version 3.1.8. OS=NT. This is the same version I used to build boost with (successfully) with vc7.1. I am using the source for bjam included in the 1.31 release of boost * when I try to build boost with a simple bjam stage at the root dir of boost, it succeeds * when I double check the BOOST_ROOT env var with a dir command- it shows me the right dir * my TOOLS envvar is set to TOOLS=vc7.1 This was necessary before being able to build boost * when I CD into the HELLO example for bjam and try a Bjam I GET warning: no toolsets are configured. warning: you won't be able to build C++ programs. warning: please consult the documentation. C:/Data/Rmtg/Root/_Common/_Lib/Boost/V_1_31/tools/build/v2/build\targets .jam:1073: in construct from module object(exe-t arget-class)@1 error: unable to construct ./hello C:/Data/Rmtg/Root/_Common/_Lib/Boost/V_1_31/tools/build/v2/build\targets .jam:914: in object(exe-target-class)(a)1.generate from module object(exe-target-class)@1 C:/Data/Rmtg/Root/_Common/_Lib/Boost/V_1_31/tools/build/v2/build\targets .jam:510: in generate-really from module object( main-target)@1 C:/Data/Rmtg/Root/_Common/_Lib/Boost/V_1_31/tools/build/v2/build\targets .jam:483: in object(main-target)(a)1.generate from module object(main-target)@1 C:/Data/Rmtg/Root/_Common/_Lib/Boost/V_1_31/tools/build/v2/build\targets .jam:179: in object(project-target)(a)1.generate f rom module object(project-target)@1 C:/Data/Rmtg/Root/_Common/_Lib/Boost/V_1_31/tools/build/v2\build-system. jam:160: in load from module build-system C:\Data\Rmtg\Root\_Common\_Lib\Boost\V_1_31\tools\build\v2\example\..\ke rnel\modules.jam:259: in import from module modu les C:\Data\Rmtg\Root\_Common\_Lib\Boost\V_1_31\tools\build\v2\example\..\ke rnel\bootstrap.jam:120: in boost-build from modu le C:\Data\Rmtg\Root\_Common\_Lib\Boost\V_1_31\tools\build\v2\example\boost -build.jam:2: in module scope from module When I TRY: bjam -sTOOLS=vc7.1 bjam "-sTOOLS=vc7.1" bjam debug bjam release bjam "-sTOOLS=vc7.1" debug bjam "-sTOOLS=vc7.1" release I always get the above errors If I COPY the files in \tools\build\v2\example\hello to the ROOT of boost (and overwrite the jam file there)- IT DOES BUILD PROPERLY I have build bjam and stepped through it in the IDE and was not able to make much of what the source was doing (other than it looks like a lot of recursive parsing of files) (spent most of my evening yesterday doing that. MY QUESTIONS: * Which is the right version of boost to be running here? * does the \tools\build\v2\example\hello sample bjam compile for anyone else? (i.e. is it broken?) * is there a good sample of a simple working example for bjam somewhere else? * Any ideas on why I can BUILD BOOST but not any of the subprojects (everything else I have tried has the same problems) * How do you folks debug this thing- ****any**** techniques would be helpful * is the toolsets it is complaining about the COMPILER (i.e. TOOLS envvar?) or is it something else entirely? * HELP ! :) I am doing this pain because I am trying to get boost defined as the standard in my company (It is within my power to do that). I would also like to use the bjam tool as our standard build tool, but I FIRST need to figure out how to build projects with it (grin). Thanks to anyone for thoughts or things to try. Thanks Brian C Braatz

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Difference in adjacency_list
by Daniele Carlucci 27 Jul '04

27 Jul '04

Hi, I'm a newby. Anyone can explain me the difference between: typedef adjacency_list<listS, vecS, undirectedS... and typedef adjacency_list<vecS, vecS, undirectedS... Thanks Daniele

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Bjam- racking my brain
by Brian Braatz 27 Jul '04

27 Jul '04

For the last several days (a few hours each day) I have been trying to get the \tools\build\v2\example\hello sample to build with bjam- (windows XP, vc7.1) I CAN build boost from the command line, but when I move into the \tools\build\v2\example\hello dir and try various combinations of bjam (with and without -sTools=vc7.1 etc..) I get the same error no matter what I do. I took the bjam sources and compiled a debug version in the Visual Studio IDE, and have spent the evening stepping through the code and reading the docs. This is one of these things I think that I just have to completely internalize how this thing works before I will crack this. What I am asking for from this list: * Any basic advice on debugging what bjam is doing * any basic advice or good sample that is a bare and working bjam project to look at * This is weird to me, as the ENV var for the toolset DOES work for building boost itself * I feel like I am missing something obvious and stupid, anyone who wishes to point out what dumb thing I missed, please go at it :) * any help in looking at this output: C:\Data\Rmtg\Root\_Common\_Lib\Boost\V_1_31\tools\build\v2\example\hello >bjam warning: no toolsets are configured. warning: you won't be able to build C++ programs. warning: please consult the documentation. C:/Data/Rmtg/Root/_Common/_Lib/Boost/V_1_31/tools/build/v2/build\targets .jam:1073: in construct from module object(exe-t arget-class)@1 error: unable to construct ./hello C:/Data/Rmtg/Root/_Common/_Lib/Boost/V_1_31/tools/build/v2/build\targets .jam:914: in object(exe-target-class)(a)1.generate from module object(exe-target-class)@1 C:/Data/Rmtg/Root/_Common/_Lib/Boost/V_1_31/tools/build/v2/build\targets .jam:510: in generate-really from module object( main-target)@1 C:/Data/Rmtg/Root/_Common/_Lib/Boost/V_1_31/tools/build/v2/build\targets .jam:483: in object(main-target)(a)1.generate from module object(main-target)@1 C:/Data/Rmtg/Root/_Common/_Lib/Boost/V_1_31/tools/build/v2/build\targets .jam:179: in object(project-target)(a)1.generate f rom module object(project-target)@1 C:/Data/Rmtg/Root/_Common/_Lib/Boost/V_1_31/tools/build/v2\build-system. jam:160: in load from module build-system C:\Data\Rmtg\Root\_Common\_Lib\Boost\V_1_31\tools\build\v2\example\..\ke rnel\modules.jam:259: in import from module modu les C:\Data\Rmtg\Root\_Common\_Lib\Boost\V_1_31\tools\build\v2\example\..\ke rnel\bootstrap.jam:120: in boost-build from modu le C:\Data\Rmtg\Root\_Common\_Lib\Boost\V_1_31\tools\build\v2\example\boost -build.jam:2: in module scope from module C:\Data\Rmtg\Root\_Common\_Lib\Boost\V_1_31\tools\build\v2\example\hello >set TOOLs TOOLS=vc7.1 Any help would be appreciated, tomorrow afternoon I am going to go back at it, and this time I might "get all medieval" about things :)

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long long support with GCC
by Aaron W. LaFramboise 27 Jul '04

27 Jul '04

Hi, As I'm sure you know, long long and unsigned long long are supported by GCC in C++. However, -std=c++98 (not quite sure why, to be honest) and -pedantic cause lots of warnings and errors to be generated in the Boost headers when long long is used. In my project, it is desirable to use these flags for other reasons, but the effect these flags have on the Boost headers is decidedly undesirable. So far, I've been wrapping the Boost headers in forwarding headers that mark the Boost headers as system headers so that they compile without warning or error. Is there any disadvantage to doing this? GCC supports long long even with the above options, but only if __extension__ is used. I notice that there a Boost-standard 64bit type, boost::int64_t. Is there some reason that this can't be typedef'ed using the GCC extension, and then this identifier used in all places where 'long long' is being used? Are there type system rules that prevent this, or some other reason? Thank you for your consideration, Aaron W. LaFramboise

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building boost on vc7.1 with stlport
by tweety 26 Jul '04

26 Jul '04

i first compiled (succesfully) stlport 4.6.2. then i ran "bjam "-sTOOLS=vc7.1-stlport" install" and it failed compiling the regex library. then i manually went to the libs\regex\build folder and ran "nmake /f vc7.1-stlport clean install" and it compiled the first thing ok and the 2nd time around threw a LOT of linker errors (well, only ~49, but they're stl-style-long :D). I set correctly the STLPORT_VERSION and the STLPORT_PATH env vars, the tools were loaded ok, the INCLUDE env var had stlport's include dir first... AND IT COMPILED OK the first one... here's a screenshot of the last page of errors. please help me... winstances.obj : error LNK2019: unresolved external symbol "__declspec(dllimport ) public: __thiscall _STL::basic_string<wchar_t,class _STL::char_traits<wchar_t> ,class _STL::allocator<wchar_t> >::basic_string<wchar_t,class _STL::char_traits< wchar_t>,class _STL::allocator<wchar_t> >(wchar_t const *,unsigned int,class _ST L::allocator<wchar_t> const &)" (__imp_??0?$basic_string@_WV?$char_traits@_W@_ST L@@V?$allocator@_W@2@@_STL@@QAE@PB_WIABV?$allocator@_W@1@@Z) referenced in funct ion "public: class _STL::basic_string<wchar_t,class _STL::char_traits<wchar_t>,c lass _STL::allocator<wchar_t> > __fastcall boost::reg_expression<wchar_t,class b oost::regex_traits<wchar_t>,class _STL::allocator<wchar_t> >::str(void)const " ( ?str@?$reg_expression@_WV?$regex_traits@_W@boost@@V?$allocator@_W@_STL@@@boo st@@ QBI?AV?$basic_string@_WV?$char_traits@_W@_STL@@V?$allocator@_W@2@@_STL@@XZ) winstances.obj : error LNK2019: unresolved external symbol "__declspec(dllimport ) public: int __thiscall _STL::basic_string<wchar_t,class _STL::char_traits<wcha r_t>,class _STL::allocator<wchar_t> >::compare(class _STL::basic_string<wchar_t, class _STL::char_traits<wchar_t>,class _STL::allocator<wchar_t> > const &)const " (__imp_?compare@?$basic_string@_WV?$char_traits@_W@_STL@@V?$allocator@_W@2@@ _S TL@@QBEHABV12@@Z) referenced in function "public: int __fastcall boost::reg_expr ession<wchar_t,class boost::regex_traits<wchar_t>,class _STL::allocator<wchar_t> >::compare(class boost::reg_expression<wchar_t,class boost::regex_traits<wchar_ t>,class _STL::allocator<wchar_t> > const &)const " (?compare@?$reg_expression@_ WV?$regex_traits@_W@boost@@V?$allocator@_W@_STL@@@boost@@QBIHABV12@@Z) winstances.obj : error LNK2019: unresolved external symbol "__declspec(dllimport ) public: class _STL::basic_string<wchar_t,class _STL::char_traits<wchar_t>,clas s _STL::allocator<wchar_t> > & __thiscall _STL::basic_string<wchar_t,class _STL: :char_traits<wchar_t>,class _STL::allocator<wchar_t> >::assign(unsigned int,wcha r_t)" (__imp_?assign@?$basic_string@_WV?$char_traits@_W@_STL@@V?$allocator@_W@2@ @_STL@@QAEAAV12@I_W@Z) referenced in function "private: struct boost::re_detail: :re_syntax_base * __fastcall boost::reg_expression<wchar_t,class boost::regex_tr aits<wchar_t>,class _STL::allocator<wchar_t> >::compile_set_aux(class boost::re_ detail::jstack<class _STL::basic_string<wchar_t,class _STL::char_traits<wchar_t> ,class _STL::allocator<wchar_t> >,class _STL::allocator<wchar_t> > &,class boost ::re_detail::jstack<class _STL::basic_string<wchar_t,class _STL::char_traits<wch ar_t>,class _STL::allocator<wchar_t> >,class _STL::allocator<wchar_t> > &,class boost::re_detail::jstack<unsigned long,class _STL::allocator<wchar_t> > &,class boost::re_detail::jstack<class _STL::basic_string<wchar_t,class _STL::char_trait s<wchar_t>,class _STL::allocator<wchar_t> >,class _STL::allocator<wchar_t> > &,b ool,struct boost::re_detail::_narrow_type const &)" (?compile_set_aux@?$reg_expr ession@_WV?$regex_traits@_W@boost@@V?$allocator@_W@_STL@@@boost@@AAIPAUre_sy ntax _base@re_detail@2@AAV?$jstack@V?$basic_string@_WV?$char_traits@_W@_STL@@V?$a lloc ator@_W@2@@_STL@@V?$allocator@_W@2@@42@0AAV?$jstack@KV?$allocator@_W@_STL@@@ 42@0 _NABU_narrow_type@42@@Z) vc71-stlport/boost_regex-vc71-mt-p-1_31.dll : fatal error LNK1120: 49 unresolved externals NMAKE : fatal error U1077: 'link' : return code '0x460' Stop. ---------------------------------- Peace and love, Tweety mitea(a)sympatico.ca - tweety_04_01(a)users.sourceforge.net YahooID: tweety_04_01

2 18

RE: [Boost-users] using boost::shared_ptr with boost::signal
by Ben Hutchings 26 Jul '04

26 Jul '04

Oliver Kowalke <oliver.kowalke(a)t-online.de> wrote: > Hi, > > I want to use boost::shared_ptr with boost::signal. > > class A > { > private: > int _i; > public: > A() : _i( 0) {} > > void operator()( int, std::string & s) > { i+= 1; } > > void operator()( std::string & s, int) > { i+= 2; } > }; > > boost::shared_ptr< A > a( new A() ); > boost::signal< void( int, std::string &) > rsig; > boost::singal< void( std::string &, int) > lsig; > > rsig.connect( a); > lsig.connect( a); > > rsig(0,"called from right side"); > lsig("called from left side",0); > > Because a is a smart_ptr this code would not compile because > operator() is not a member function. If I dereference the smart > pointer when I connect to signal, changes of a are never know > by the other signal instance. > Maybe I can use a proxy class which aggregates the smart pointer > but maybe there is a better solution?! As a general rule, functors are expected to be copiable and not to have mutable state of their own. So how about putting the shared_ptr inside A instead: class A { private: boost::shared_ptr<int> _i; public: A() : _i(new int(0)) {} void operator()(int, std::string & s) { *_i += 1; } void operator()(std::string & s, int) { *_i += 2; } }; A a;

1 0

regex bug (regex_search throws bad_expression)
by Adam Molnar 26 Jul '04

26 Jul '04

hi! using the latest regex patch and vc7.1 i've accidentally encountered the following: ... regex re("([^\n]*\\n+\\s+)+NEEDEDSUBITEM2:[^\\s]"); bool matched = regex_search(text, re); // bad_expression ... i figured out those \\s -s may cause the problem. sample text attached. and one question: having "DATA.*?ITEM1(ITEM2)?" and an input like "DATA ITEM1 ITEM1ITEM2" should ITEM2 be extracted? i think it would be good to make a note on this case in the doc. yours, adam begin 666 match_test.txt M#0I)5$5-5%E014$Z#0H@(" @4U5"251%33$Z('AX> T*#0H@(" @3D5%1$5$ M4U5"251%33$Z(" @('AX>'@-"B @("!.145$141354))5$5-.B @("!X>'AX M#0H-"DE414U465!%0CH-"B @("!354))5$5-,3H@>'AX#0H-"B @("!.145$ M141354))5$5-,3H@(" @>'AX> T*(" @($Y%141%1%-50DE414TR.B @("!X '>'AX#0H-"@`` ` end

3 4

Building boost::fs to a dll
by boost＠dalvander.com 26 Jul '04

26 Jul '04

Is it possible to build boost::filesystem to a dll instead of creating a static linked library? // Anders Dalvander

2 1

C++ Template Metaprogramming
by David Abrahams 25 Jul '04

25 Jul '04

For the past year Aleksey Gurtovoy and I have been working on a new book, titled _C++ Template Metaprogramming: Concepts, Tools and Techniques from Boost and Beyond_. The book has recently entered copyediting. If you're interested you can peruse some sample chapters at http://boost-consulting.com/mplbook. Regards, Dave -- Dave Abrahams Boost Consulting http://www.boost-consulting.com

5 10

Building boost into a single dll
by boost＠dalvander.com 24 Jul '04

24 Jul '04

Is it possible to build all (or some specified) boost libraries into one single dll? // Anders Dalvander

1 0

Newbie -- Regex, Unicode, XCode and MacOSX
by Steve Moore 23 Jul '04

23 Jul '04

Hello. I'm trying to incorporate Unicode regex searching in a little app I'm doing. I'm building using XCode 1.2 on MacOSX 10.3.4. The problem I'm having is that I can't seem to get boost's regex to incorporate unicode or wide-character support. In <boost/config/platform/macos.hpp> there is the line #define BOOST_NO_CWCHAR which seems to disable allowance for unicode by causing boost::wregex and boost::wcmatch symbols to not be typedef-ed. A test app. shows that these symbols are defined when I build using Codewarrior. So I'm wondering how to get unicode support for regex using XCode (gcc) on a MacOSX machine. Any suggestions? Thanks 10^6, STeve Moore.

2 3

Don't seed() mersenne_twister RNG with 0
by Benoît SIBAUD 23 Jul '04

23 Jul '04

Hi, a seed(0) with a mersenne_twister (like mt11213b or mt19937) aborts on some assertion (tested on boost 1.31). boost/random/linear_congruential.hpp:61: boost::random::linear_congruential<IntType, a, c, m, val>::linear_congruential(IntType) [with IntType = uint32_t, IntType a = 69069, IntType c = 0, IntType m = 0, IntType val = 0]: Assertion `c || x0' failed. mersenne_twister::seed(x) calls linear_congruential<uint32_t, 69069, 0, 0, /* unknown */ 0>(x), which asserts(0 || x). So x must be non-zero. I didn't see it in the doc, but I think it would be a good thing to have it written down, or to have mersenne_twister::seed() modified to avoid the assertion. Regards, -- Benoît Sibaud

1 1

filesystem and existing files
by Russell Hind 23 Jul '04

23 Jul '04

With filesystem, you can do filesystem::path P(....); filesystem::ofstream S; if (!filesystem::exists(P)) { S.open(P); } But isn't there a race condition here which could lead to a file created by another process being wiped out, or added to? Is there a way to get ofstream::open to fail if the file already exists? It succeeds on VC7.1 but in some situations I don't want it to succeed. Cheers Russell

2 4

Looking for some help with boost::thread::sleep()
by Kutch, Patrick G 23 Jul '04

23 Jul '04

I am used to putting in quick sleep() statements in my worker threads, usually a sleep(0) just to give up a timeslice, or maybe a sleep(1). Of course boost::thread::sleep takes an xtime object not a milliseconds value, so I wrote a small routine to simulate the sleep() statement using boost::thread::sleep: void inline UtilitySleep(long milliSeconds) { const int NANOSECONDS_PER_MILLISECOND = 1000000; if (0 == milliSeconds) { boost::thread::yield(); // just do a yield return; } boost::xtime time; int sec = 0; // if larger than 1 sec, do some voodoo for the boost::xtime struct if (milliSeconds >= 1000) { // convert ms > 1000 into secs + remaining ms int secs = milliSeconds /1000; milliSeconds = milliSeconds - secs*1000; sec += secs; } milliSeconds*=NANOSECONDS_PER_MILLISECOND; // normal boost time sleep stuff // get current time boost::xtime_get(&time,boost::TIME_UTC); // add # of desired secs and ms time.nsec+=milliSeconds; time.sec+= sec; // sleep until that time boost::thread::sleep(time); } It seems to always work fine unde Windows, however occasionally under Linux it appears that if I use a small value, such as sleep(2) that sometimes it takes longer to setup the values and call boost::thread:sleep() and I end up passing an xtime value that has already passed, basically blocking the thread forever. Anybody have any advice for me? Thanx! - Patrick

1 0

Peculiar uBLAS compile error...
by Nicholas Andrews 23 Jul '04

23 Jul '04

Hi, I have the following c++ function: void multi_state_kf::correction(const vector<double>& obs, const matrix<double>& dev) { compute_gain(dev); vector<double> temp = (m*obs-newX*m); x=newX+prod(temp,K); matrix<double> T=identity_matrix<double>(3,3)-K*m; matrix<double> temp2=prod(T,newP); matrix<double> temp3=prod(K,dev); P=prod(temp2,trans(T))+prod(temp3,trans(K)); } The syntax is completely hacked together as this is my first attempt at using boost's uBLAS, but it got rid of most of my errors except this one: \boost\numeric\ublas\functional.hpp(190): error C2440: '=' : cannot convert from 'const boost::numeric::ublas::matrix_binary_scalar2<E1,E2,F>::value_type' to 'double' (...) The odd (for me) part is that even when I remove all boost function calls from the function the compile error still shows up and it points me to a line in the functional.hpp file. So 1. Does anyone know what could be causing this compile error? 2. What's a better way of writing this function? Thanks in advance, Nick

1 0

test failure rate and usage
by JHAYNBERG＠cooperneff.com 22 Jul '04

22 Jul '04

I wanted to use the Boost smart_ptr classes on Solaris 8/Workshop 7 and RedHat E3/gcc 3.23. So, I downloaded the boost src (and jam and boost.build) and built the entire package. After seeing many test failures, I discovered on the regression test page that no compiler achieves 100% pass rate and some are about 30%. I have 2 questions. One, in general, how does one know when it is "safe" to use a boost library on a particular platform? For example, if a platform's failure rate is 15%, should boost be used? And, two, with just the boost source (without building any libraries), I was able to use the boost::shared_ptr in my Solaris application by merely including the right header. Apparently, I don't need to build boost to use shared_ptr which leads me to ask, in general, how do one know when a library is needed (or not needed)? Shouldn't the fact that boost is mainly templates mean there should be little or no implementation (i.e. code that needs to be compiled into a library)? For example, many template libraries are provided as header-only solutions. Thanks! Jay Haynberg Software Engineer This message and any attachments (the "message") is intended solely for the addressees and is confidential. If you receive this message in error, please delete it and immediately notify the sender. Any use not in accord with its purpose, any dissemination or disclosure, either whole or partial, is prohibited except formal approval. The internet can not guarantee the integrity of this message. BNP PARIBAS (and its subsidiaries) shall (will) not therefore be liable for the message if modified. --------------------------------------------- Ce message et toutes les pieces jointes (ci-apres le "message") sont etablis a l'intention exclusive de ses destinataires et sont confidentiels. Si vous recevez ce message par erreur, merci de le detruire et d'en avertir immediatement l'expediteur. Toute utilisation de ce message non conforme a sa destination, toute diffusion ou toute publication, totale ou partielle, est interdite, sauf autorisation expresse. L'internet ne permettant pas d'assurer l'integrite de ce message, BNP PARIBAS (et ses filiales) decline(nt) toute responsabilite au titre de ce message, dans l'hypothese ou il aurait ete modifie.

2 1

Please help me understand boost:lambda
by TP Diffenbach 21 Jul '04

21 Jul '04

I'm having some difficulties figuring out how to use boost::bind and boost::lambda Here's what I've trying to do: use transform to transform the values in one container to another, looking up the new value as a function of the old. What I'm trying to do is conceptually simple: call std::transform with a predicate that takes the original value, does a std::find_if on that value in another "container" using a bound std::greater< int > predicate, converts the returned iterator to an integral distance, and inserts that integral distance in the container that is the destination of the transform. Doing this using a hand-coded functor is easy enough, but I'm not able to figure out how to do it using boost::lambda. If I understand lambda, this should make each element of c equal to four times the corresponding element of o, and indeed this compiles as works as expected. std::transform( o.begin(), o.end(), std::back_inserter( c ), _1 = _1 * 4 ) ; This bit of code will look up a value, the index of the first element in partition with a value greater than v (or 3 if v is greater than all values in partition: int partition[] = { 10, 20, 30 } ; offset = std::find_if( partition, partition + 3, boost::bind( std::greater< int >(), _1, v ) ) - partition ; This code wraps the lookup and the subtraction that turns the returned pointer into an offset: template< template< typename > class Pred, typename It, typename T > int find_region_offset( It b, It e, T val ) { return std::find_if( b, e, std::bind2nd( Pred< T >(), val ) ) - b ; } and this code uses the wrapper, along with the transform: std::transform( o.begin(), o.end(), std::back_inserter( c ), boost::bind( find_region_offset< std::greater, int*, int>, partition, partition + 3, _1 ) ) ; So far, so good. What I don't know how to do is to dispense with the wrapper. As close as I can come is to use this class: struct identityPred { int operator()( int i ) { return i ; } } ; to do this: std::transform( o.begin(), o.end(), std::back_inserter( c ), boost::bind( std::less< int* >(), // to subtract the returned pointer from partition boost::bind( std::find_if< int*, identityPred >, partition, partition + 3, identityPred() ), partition) ) ; This compiles, but I don't want identityPred, I want boost::bind( std::greater< int >(), _1, _1X ) where _1 is the value in the partition array and _1X is the value read from container o. Ideally I'd like to do this using boost::lambda, which I think would look something like: std::transform( o.begin(), o.end(), std::back_inserter( c ), _1 = find_if(partition, partition + 3, _1 > var( _1 )) - partition ) ; where the first and last "_1"s are transform's (containers o and c's) values, and middle one is partition's values. Again, what I'm trying to do is conceptually simple: call transform with a predicate that takes the original value, does a find_if on that value in another "container" using a bound std::greater< int > predicate, converts the returned iterator to an integral distance, and inserts that integral distance in the container that is the destination of the transform. So if someone could point out to me what I'm doing wrong, or point me to more examples of using boost::lambda than are contained in the boost::lambda documentation, or could just tell me that what I'm trying to do isn't possible (and why it's not possible) I'd very much appreciate it. Thanks. PS And a technical trouble: if I include both boost::bind and boost::lambda, and I am using namespace boost::lambda to save qualifying each _1, I get a type redefinition for _1, with one definition in boost::bind, when using gcc under cygwin: b.cpp:49: error: use of `_1' is ambiguous /usr/local/include/boost/lambda/core.hpp:74: error: first declared as `const boost::lambda::placeholder1_type&boost::lambda::<unnamed>::_1' here /usr/local/include/boost/bind/placeholders.hpp:55: error: also declared as ` boost::arg<1> <unnamed>::_1' here b.cpp:57: error: use of `_1' is ambiguous /usr/local/include/boost/lambda/core.hpp:74: error: first declared as `const boost::lambda::placeholder1_type&boost::lambda::<unnamed>::_1' here /usr/local/include/boost/bind/placeholders.hpp:55: error: also declared as ` boost::arg<1> <unnamed>::_1' here Should this be happening?

1 0

date-time
by Jonathan Oulds 21 Jul '04

21 Jul '04

Could anyone explain to me why there is not a default constructor for boost::gregorian::date_time and boost::posix_time::ptime. I implemented a simple constructor where both classes are created as 'not_a_date_time'. The only problem I have had is compiling my code on other peoples machines that do not have my modification to the date_time library. jonathan

7 19

RE: [Boost-users] database lib
by Ajit Jadhav 21 Jul '04

21 Jul '04

Regarding DTL, see http://lists.boost.org/MailArchives/boost/msg13153.php. Not sure where it stands now. > -----Original Message----- > From: boost-users-bounces(a)lists.boost.org > [mailto:boost-users-bounces@lists.boost.org] On Behalf Of Chris > Sent: Wednesday, July 21, 2004 11:13 AM > To: boost-users(a)lists.boost.org > Subject: [Boost-users] database lib > > > Hi all, > > I am wondering if there are any plans to include a database > library, for example for ODBC in the boost library. > > Please bear in mind that I am new to the boost libraries and > find them really cool. > > But like the socket library I found it because of an old > post, so that is why I am asking about the database library. > > Also I found this library really interesting and am using it > in a couple of small spike solutions: > http://dtemplatelib.sourceforge.net/index.htm > (Any comments > on the library are welcome) > > Thanks, > Chris > > > > _______________________________________________ > Boost-users mailing list > Boost-users(a)lists.boost.org > http://lists.boost.org/mailman/listinfo.cgi/bo> ost-users >

1 0

Testing boost installation
by Tom Puverle 21 Jul '04

21 Jul '04

In our environment it is a requirement that all libraries that are about to be deployed are tested. I would like to know if there is a way in which I can run the regression tests against the installed version of the boost headers and libraries, so that I can check they have been built and installed correctly. Thanks. _________________________________________________________________ Want to block unwanted pop-ups? Download the free MSN Toolbar now! http://toolbar.msn.co.uk/

1 0

boost equivalent to sgi hash_map?
by Stephen torri 21 Jul '04

21 Jul '04

Is there a boost equivalent to SGI hash_map? I am looking for a data structure that taking the key finds the data in one step O(1). Stephen

2 1

FW: boost::filesystem on WIN32: Problem passing pointer of native to path
by Christian Hoffmann 21 Jul '04

21 Jul '04

Hello... We have problems here passing the boost::filesystem::native function as a checker on WIN32 platform, eg. like this ... boost::filesystem::path path ("d:\hello\hello", boost::filesystem::native); ... When we take the address of the function "boost::filesystem::native(...)" in dll A and the pass it to boost filesystem dll, the various comparisons with "native" inside path_posix_windows.cpp:m_path_append ( const std::string & src, name_check checker ) fail, and and the code throws an invalid name exception. (e.g. line 242: if ( (checker == no_check || checker == native) && src.size() >= 2 ) fails as checker != native) The microsoft compiler takes the address into an internal function table, instead of the adress of the "real" boost::filesystem::native () function, so the comparison can never be true. Anybody got an idea what to do? PS: Getting the address of the native function like this works: path ("d:\hello\hell", reinterpret_cast<boost::filesystem::path::name_check> (GetProcAddress (GetModuleHandle("boost_filesystem-vc71-mt-gd-1_31"), "?native@filesystem@boost@@YA_NABV?$basic_string@DU?$char_traits@D@std@@ V?$allocator@D@2@@std@@@Z"))); But is not really an option... -- Christian Hoffmann This message, including any attachments, is intended only for the person(s) to whom it is addressed. If you received it in error, please let us know and delete the message from your system. This message may be confidential and may fall under the duty of non-disclosure. Any use by others than the intended addressee is prohibited. Trema shall not be liable for any damage related to the electronic transmission of this message, such as failure or delay of its delivery, interception or manipulation by third parties, or transmission of viruses or other malicious code.

1 0

How to install boost step by step approach
by sena 21 Jul '04

21 Jul '04

Hi Friends, I am trying to use Bayer++ classes for Kalman filter But before that I have to install boost c++ library. My fisrt effort was not successful. Can anyone tell me how to install it in Redhat Linux-8? I need step by step with best bug free versions Thanks a lot Sena Seneviratene Computer Engineering Lab Sydney University Australia

3 2

Regex Problems
by Pietje Leugenaar 21 Jul '04

21 Jul '04

Hi, compiling "a{7}" or any repeat with curly brackets gives me an "invalid regex synyax"! Any clues or workarounds? Then boost::regex expression("GO:(\d+)",regex::bk_refs); string str=boost::regex_replace("GO:000015|GO:00016",expression,"$1") str equals "00001500015|00016" instead of the expected "000015|00016"!? I constructed a workaround for the latter problem with an explicit loop over regex_iterator and such but this not really handy... Thanx for any feedback!! Kenny _________________________________________________________________ Plannen om een nieuwe computer te kopen? Kijk eens hier.. http://www.msn.be/shopping/dell_bis/

2 1

database lib
by Chris 21 Jul '04

21 Jul '04

Hi all, I am wondering if there are any plans to include a database library, for example for ODBC in the boost library. Please bear in mind that I am new to the boost libraries and find them really cool. But like the socket library I found it because of an old post, so that is why I am asking about the database library. Also I found this library really interesting and am using it in a couple of small spike solutions: http://dtemplatelib.sourceforge.net/index.htm (Any comments on the library are welcome) Thanks, Chris

3 2

View the shortest paths
by Daniele Carlucci 20 Jul '04

20 Jul '04

Hi, Which is the command to visualize a path in a graph? For ie I want to visualize all the shortest path inside a graph, or all the path from a source to a dest. Thanks Daniele

5 10

Info about a graph with structure instead node
by Daniele Carlucci 20 Jul '04

20 Jul '04

Hi all, I'm a newby in this library. I'm interested to make a graph of network. It's possible or is very hard to make? I want to have inside every node a struct. Thanks Daniele

2 5

Problems with building filesystem under win32 using vc6 and stlport
by huangliang 20 Jul '04

20 Jul '04

Recently I begin to use stlport in my programs, and I build boost filesystem under win32 using bjam, vc6 and stlport 5.0. But when I linke to the libfilesystem.lib, the error said that that the libsystem.lib doesn't consist of interfaces that have parameters of _STL::string type. I guess I must have not correctly configure the bjam to build filesystem. But how can I make it to recognize _STL namespace?

2 1

using DFS visitors
by Gustavo Sÿffffe1nchez 20 Jul '04

20 Jul '04

hello all, we are trying to use a DFS visitor in a similar way as the BFS visitor which is used in the example "bfs.cpp" (boost 1.31.0), that is the code, but it complains about a lot of errors in the internal boost library files... #include <boost/config.hpp> #include <assert.h> #include <vector> #include <algorithm> #include <utility> #include <iostream> #include <boost/graph/adjacency_list.hpp> #include <boost/graph/depth_first_search.hpp> #include <boost/graph/visitors.hpp> #include <boost/property_map.hpp> #include <boost/graph/graph_utility.hpp> using namespace boost; using namespace std; // visitor que muestra el orden en que se encuentran los arcos template <class NewGraph, class Tag> struct muestra_orden : public boost::base_visitor<muestra_orden<NewGraph, Tag> > { typedef Tag event_filter; muestra_orden(NewGraph& graph) : new_g(graph) { } template <class Edge, class Graph> void operator()(Edge e, Graph& g) { cout << "arco: " << e << endl; } private: NewGraph& new_g; }; template <class NewGraph, class Tag> inline muestra_orden<NewGraph, Tag> MuestraOrden(NewGraph& g, Tag) { return muestra_orden<NewGraph, Tag>(g); } //**************************************************************************+ template <class NewGraph, class Tag> struct muestra_ordenV : public boost::base_visitor<muestra_ordenV<NewGraph, Tag> > { typedef Tag event_filter; muestra_ordenV(NewGraph& graph) : new_g(graph) { } template <class Vertex, class Graph> void operator()(Vertex v, Graph& g) { cout << "ARCO: " << v << endl; } private: NewGraph& new_g; }; template <class NewGraph, class Tag> inline muestra_ordenV<NewGraph, Tag> MuestraOrdenV(NewGraph& g, Tag) { return muestra_ordenV<NewGraph, Tag>(g); } /********************************************************/ int main(int , char* []) { using namespace boost; typedef boost::adjacency_list< boost::mapS, boost::vecS, boost::undirectedS, boost::property<boost::vertex_color_t, boost::default_color_type, boost::property<boost::vertex_degree_t, int, boost::property<boost::vertex_in_degree_t, int, boost::property<boost::vertex_out_degree_t, int> > > > > Graph; Graph G(11); boost::add_edge(5, 6, G); boost::add_edge(0, 1, G); // 0 es el + boost::add_edge(1, 2, G); boost::add_edge(1, 3, G); boost::add_edge(2, 4, G); boost::add_edge(3, 5, G); boost::add_edge(4, 6, G); boost::add_edge(5, 7, G); // 7 es el - boost::add_edge(5, 10, G); boost::add_edge(10, 11, G); boost::add_edge(11, 12, G); typedef graph_traits<Graph>::vertex_descriptor Vertex; typedef graph_traits<Graph>::vertices_size_type size_type; Graph G_copy(11); size_type d[11]; std::vector<Vertex> p(num_vertices(G)); std::fill_n(d,11,0); Vertex s=7; p[s]=s; boost::depth_first_search (G, visitor(boost::make_dfs_visitor( std::make_pair(boost::record_predecessors(&p[0],boost::on_tree_edge()), std::make_pair(MuestraOrdenV(G_copy,boost::on_finish_vertex()), MuestraOrden(G_copy, boost::on_tree_edge())))) ), s); // we can compile the visitor(...) clause alone, but not inside depth_first_search (...) clause. return 0; } thanks a lot Gus --------------------------------- [input] [input] [input]

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Dependency of Boost library on STD namespace
by anas munir 19 Jul '04

19 Jul '04

Dear users, I am trying to port Boost Library with Microtec Toolkit. Is it possible to build Boost Library without Standard C++ RTL placed in std namespace ? If yes, then please guide me to the mechanism to do so. Like in STLport, this thing is configurable. Regards, Anas

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Re: [Boost-users] serialization of a complex object
by Bo Peng 19 Jul '04

19 Jul '04

On Mon, Jul 19, 2004 at 05:08:02AM -0700, Jeff Garland wrote: > There are still some open issues with getting all the serialization tests > working. Thanks. I should have checked this before I used the library.... this cost me several hours of painful debugging. :-( Bo

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serialization of a complex object
by Bo Peng 19 Jul '04

19 Jul '04

Dear list, I have tried many ways but could not figure out how to boost::serialize the following object: Basically, to maintain a big chunk of small objects, I use a memory pool to allocate a big trunk of memory and return the pointers to small objects. struct small { int size; int * ptr; init(int s, int* p){ size = s; ptr = p; } } struct All { vector<int> data; vector<small> objs; All(int num_obj, int size_obj) { data.resize( num_obj * size_obj); for(int i=0; i<num_obj; i++) objs[i].init( size_obj, &data[i* size_obj]); } } It is easy to serialize All::data but how to deal with small::ptr is beyond me. I tried the following ways: 1. in small ar & size & ptr. --- template expansion error. 2. in small ar & size & reinterpret_cast<unsigned int>ptr --- core dump. What I am trying to do in 2 is that in load(....), I want to ar & objs; /// get the number of old pointer back. find the smallest number of objs[i].ptr relocate objs[i].ptr to &data[0] + objs[i].ptr - smallest point. However, I can not do this in the load(...) function. The template expansion does not allow changes to objs (this does not make sense to me though). 3. ignore ptr --- can compile, core dump. Can someone give me a bit of insights how I can make things work? Thanks.

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RE: [Boost-users] Re: shared_ptr: LWM versus atomic_count?
by Ben Hutchings 19 Jul '04

19 Jul '04

Russell Hind <rhind(a)mac.com> wrote: > Ben Hutchings wrote: > > > > It isn't fundamentally necessary to have two counters, though; see > > <http://groups.google.com/groups?threadm=slrnbhbnpc.154.do-not-spam > > -benh%40tin.bwsint.com>. > > I'd seen this (I think you posted the same link recently). I don't > know if anything has been done to change the implementation of > shared_ptr to use this method, though (nothing to do with me). The difficulty is that it depends on a couple of unportable atomic functions that can't be implemented using the existing contents of Boost.Threads or pthreads (though they do translate neatly into Win32 functions). > If the speed increases mentioned are correct, then it certinaly > seems a good proposal. Well maybe I'll have a go at implementing it properly and then trying to get it into Boost. I suppose it can be selectively enabled for those platforms that support it.

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Re: Building boost under mingw: bjam invokes VC7?? (part IV: solu tion)
by Brewer, Christopher 19 Jul '04

19 Jul '04

I have found my way around the problem, though I don't understand why it works. Recap of the problem (for those joining late): attempting to build boost with bjam under msys/mingw resulted in very strange behavior. Within the msys shell, invoking the following line: bjam -sTOOL=mingw install ...resulted in bjam attempting to use the VC7 toolset. I checked the path within msys to make sure I was running the version of bjam.exe that I thought I was. Looking through the directories showed there was indeed only one copy. On a hunch, I moved it from it's present location at 'c:/msys/1.0/bin' to 'c:/msys/1.0/mingw/bin' and tried again. And suddenly bjam began using gcc. 8^0 Apparently where you run it from makes a big difference. I'm sure that an msys guru could take one look at the symptoms and say, "Of course! It's obvious to the meanest intellect!". Not being an msys guru I will just shrug my shoulders and move forward :) All is well now and Boost is building even as I type this message. Many thanks to those who replied! Best regards, Chris Brewer (Company-mandated disclaimer) This message originates from WMS Gaming Inc. It contains information which may be confidential or privileged and is intended only for the individual or entity named above. It is prohibited for anyone else to disclose, copy, distribute or use the contents of this message. All personal messages express views solely of the sender, which are not to be attributed to WMS Gaming Inc., and may not be copied or distributed without this disclaimer. If you received this message in error, please notify us immediately at (847) 785-3000.

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Re: [Boost-users] Installation of boost-sandbox
by Ross Boylan 18 Jul '04

18 Jul '04

On Sun, Jul 18, 2004 at 01:56:20AM -0400, Franz Mueller wrote: > Hi, > I've heared of the ublas-binding to lapack, which sounds very good. > Thus I tried to install it, but I didn't succeed. > I got boost-sandbox using cvs. Then I went to the boost-sandbox directory > and did a bjam. > I'd be interested in hearing the answer to this too, as I've been looking in the sandbox. My impression is that it is not meant to be built as a whole. As the name implies, it's a bunch of separate projects, so I think the intent is that you pull one or more of them out and stick them in a regular boost tree. That's just a guess, and I notice that this seems awkward to do since a single project may appear in several scattered directories.

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array_traits?
by Duane Murphy 18 Jul '04

18 Jul '04

Howdy fellow boosters, Several years ago I started using array_traits. I gathered from some later discussion that this library was never meant to be part of boost. However, I really like the library and find it more useful than the array<> implementation. Point in fact, array_traits and array<> overlap but probably weren't meant to solve the same problems [1]. Is array_traits around any more? I seem to recall something more general purpose. Maybe container_traits? Is this still being actively worked on? I am planning on (finally) upgrading our use of boost to a more recent version. I'm trying to work out what to do about our use of array_traits. Maybe I'll just keep using it. ...Duane [1] The primary difference between array_traits and array<> is the "construction" of the array. array_traits in fact has no construction. It can work with any arbitrary defined C-array of objects. array<> on the other hand requires construction. For my use,the major advantage that array_traits has over array<> is that I can refer to any ordinary C- array; in particular arrays that may not be under my control. Where as array<> requires that I change the type of the object.

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Installation of boost-sandbox
by Franz Mueller 18 Jul '04

18 Jul '04

Hi, I've heared of the ublas-binding to lapack, which sounds very good. Thus I tried to install it, but I didn't succeed. I got boost-sandbox using cvs. Then I went to the boost-sandbox directory and did a bjam. But I got this: libs\numeric\blasbindings\tst\Jamfile: No such file or directory libs\numeric\blasbindings\tst\Jamfile: No such file or directory don't know how to make <@boost-sandbox!libs!numeric!bindings!amos>amos.cpp ...found 227 targets... ...updating 34 targets... ...can't find 1 target... ...can't make 5 targets... MkDir1 bin I am using Visual Studio.NET Prof. 2003. I'd love to try the ublas-bindings, so can anybody help me installing it? Anything else I have to take care of once the bindings work (e.g. link to clapack or so)? -- Franz

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Re: [Boost-users] cvs access problems SOLVED --website update
by Ross Boylan 17 Jul '04

17 Jul '04

On Fri, Jul 16, 2004 at 06:44:28PM -0700, Jeff Garland wrote: > On Fri, 16 Jul 2004 18:24:18 -0700, Ross Boylan wrote > > This happened to me twice: > > $ cvs -d :pserver:anonymous@cvs.boost- > > sandbox.sourceforge.net:/cvsroot/boost-sandbox login Logging in to > > :pserver:anonymous@cvs.boost- > > sandbox.sourceforge.net:2401/cvsroot/boost-sandbox CVS password: # > > I hit enter cvs [login aborted]: connect to cvs.boost- > > sandbox.sourceforge.net(66.35.250.209):2401 failed: Connection timed > > out > > > > Am I doing something wrong (like needing to open up a port in my > > firewall), or is this just a momentary sourceforge lapse? > > > > I've gotten cvs stuff from elsewhere (including other sf projects, I > > think), so I doubt it's my setup. > > Soureforge has removed the project specifc path from url. Note the > cvs.sourceforge.net instead of cvs.boost-sandbox.sourceforge.net : > > $ cvs -d :pserver:anonymous@cvs.sourceforge.net:/cvsroot/boost-sandbox login > > Jeff Thanks, that did it. It might be good to update http://www.boost.org/more/mailing_lists.htm on the bottom, which gives the old location.

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cvs access problems
by Ross Boylan 17 Jul '04

17 Jul '04

This happened to me twice: $ cvs -d :pserver:anonymous@cvs.boost-sandbox.sourceforge.net:/cvsroot/boost-sandbox login Logging in to :pserver:anonymous@cvs.boost-sandbox.sourceforge.net:2401/cvsroot/boost-sandbox CVS password: # I hit enter cvs [login aborted]: connect to cvs.boost-sandbox.sourceforge.net(66.35.250.209):2401 failed: Connection timed out Am I doing something wrong (like needing to open up a port in my firewall), or is this just a momentary sourceforge lapse? I've gotten cvs stuff from elsewhere (including other sf projects, I think), so I doubt it's my setup.

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dated link on http://www.boost.org/
by Ross Boylan 17 Jul '04

17 Jul '04

The second paragraph reads "A further goal is to establish "existing practice" and provide reference implementations so that Boost libraries are suitable for eventual standardization. Ten Boost libraries will be included in the C++ Standards Committee's upcoming C++ Standard Library Technical Report as a step toward becoming part of a future C++ Standard." The hypertext link for C++ Standards Committee' is http://anubis.dkuug.dk/jtc1/sc22/wg21/. That page still exists, but redirects you to http://www.open-std.org/jtc1/sc22/wg21/. It would probably be good to change the link. Is there a better place to report this? I don't see any web site contact on the page.

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BGL transitive reduction algorithm?
by Thomas Costa 16 Jul '04

16 Jul '04

I've been looking at the BGL headers and documentation looking for a templated algorithm to compute the transitive reduction of a directed graph and I don't see anything. Am I missing something obvious, showing my total lack of experience in graph theory, or is this algorithm not in BGL yet?

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RE: [Boost-users] Re: shared_ptr: LWM versus atomic_count?
by Ben Hutchings 16 Jul '04

16 Jul '04

Russell Hind <rhind(a)mac.com> wrote: > Caleb Epstein wrote: > > > I've been perusing the source code of <boost/shared_ptr.hpp> and > > noticed that it uses the <boost/detail/shared_count.hpp> class to do > > reference counting and not <boost/detail/atomic_count.hpp> (unless > > BOOST_NO_MEMBER_TEMPLATES or BOOST_MSVC6_MEMBER_TEMPLATES are > > defined). > > > > Can anyone comment on the reasoning behind using a lightweight > > mutex-protected counter instead of an atomic counter? I'd > > think that an atomic counter would be faster, but I suspect that > > there is a good reason for protecting the count with a mutex. This > > then begs the question of why use the atomic counter in the > > situations mentioned above? > > If you look at shared_count, you'll see it has to keep track of 2 > values, strong_count and weak_count, you can't do this with 'atomic > count' so therefore it uses lwm. It isn't fundamentally necessary to have two counters, though; see <http://groups.google.com/groups?threadm=slrnbhbnpc.154.do-not-spam -benh%40tin.bwsint.com>.

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dupe symbols linker error with indexed_set
by Jedediah Smith 16 Jul '04

16 Jul '04

scbarg.obj : error LNK2005: "struct unbounded_type::boost::detail::unbounded_type & boost::indexed_sets::`anonymous namespace'::unbounded" (?unbounded@?A0x65131fae@indexed_sets@boost@@3AAUunbounded_type@detail@23@A) already defined in scbarcf.obj scbarg.obj : error LNK2005: "struct unbounded_type::boost::detail::unbounded_type boost::indexed_sets::`anonymous namespace'::unbounded_obj" (?unbounded_obj@?A0x65131fae@indexed_sets@boost@@3Uunbounded_type@detail@23@A) already defined in scbarcf.obj Compiler is VC7.1 The two modules in the error messages don't use indexed_set at all but indexed_set.hpp is included globally. It seems as if indexed_set.hpp has a definition hiding in it somewhere. Here are the two declarations that appear in my project (they are in different namespaces so m_events_t does not collide): typedef is::indexed_set< event_t, is::index_list< is::unique <is::member<event_t,eventid_t,&event_t::id> >, is::non_unique <is::member<event_t,double, &event_t::time> >, is::non_unique <is::member<event_t,hoption<notepos_t>,&event_t::notepos>, notepos_compare> > > m_events_t; typedef is::indexed_set< event_t, is::index_list< is::unique<is::member<event_t,eventid_t,&event_t::id> >, is::non_unique<is::member<event_t,double,&event_t::time> >, is::non_unique<is::member<event_t,Score::beatref_t,&event_t::beat> > > > m_events_t; -- Using Opera's revolutionary e-mail client: http://www.opera.com/m2/

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Heterogeneous binary buffers.
by Hagen Möbius 16 Jul '04

16 Jul '04

Hi Boosters. I recently started working on a class which provides the functionality of any other binary buffer and a bit more (which is why I do it ;)). Because the content of this buffer is not homogeneous regarding the type of the elements stored in it I have this more general question: Which type should I choose to be the basis for those buffers? Can anybody advise me, pls? Regards, Hagen.

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Building boost under mingw: bjam invokes VC7?? (part II: typo cor rected)
by Brewer, Christopher 15 Jul '04

15 Jul '04

Oops, sorry, Ben and Heinquoi- that was a typo :P What I *meant* to say was: Starting bjam with: bjam -sTOOLS=mingw install causes bjam to invoke VC7 instead of gcc. Same thing if quotes are used (as described in the documentation: bjam "-sTOOLS=mingw" install I ran it again, making sure that I actually used -sTOOLS and not -sTOOL, and I still see the described behavior. Again, this is using boost 1.31.0, msys and mingw on Windows 2000, and a prebuilt version of bjam recently downloaded from sourceforge. Anyone have any ideas how to make bjam (properly) invoke gcc? -Chris Brewer -----Original Message----- From: Ben Hutchings [mailto:ben.hutchings@businesswebsoftware.com] Sent: Tuesday, July 13, 2004 8:03 AM To: boost-users(a)lists.boost.org Subject: RE: [Boost-users] building boost under mingw: bjam invokes VC7?? Christopher Brewer <cbrewer(a)wmsgaming.com> wrote: > I recently attempted to build and install boost 1.31.0 using > msys (i.e., mingw). > I enter the boost directory and start bjam with: > > bjam -sTOOL=mingw install > > ...and then I see bjam invoking vc7 instead of gcc. <snip> The variable is called TOOLS, not TOOL.

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RE: [Boost-users] Re: Building boost under mingw: bjam invokes VC7??
by Schalk_Cronje＠NAI.com 15 Jul '04

15 Jul '04

I might be missing the point here, but I have built Boost under mingw using TOOLS=gcc and I seem to get satisfactory results. I have not actually built the regression tests, so there might be some lurking issues that I am not aware of.

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TR: pb with use Random on VC++6 and Intel C++ 8
by Heinquoi 15 Jul '04

15 Jul '04

Hello, I install and test boost on my computer since two weeks. And I have much problems. Actually I test random with the code indicated on http://www.boost.org/libs/random/index.html The code is #include <iostream> #include <boost/random.hpp> int main () { boost::mt19937 rng; // produces randomness out of thin air // see pseudo-random number generators boost::uniform_int<> six(1,6); // distribution that maps to 1..6 // see random number distributions boost::variate_generator<boost::mt19937, boost::uniform_int<> > die(rng, six); // glues randomness with mapping int x = die(); // simulate rolling a die } More simple, there is not. And, the error messages on intel c++ 8 are : Compiling... C:\BOOST_1_31_0\boost/integer_traits.hpp(129): error: class "boost::integer_traits<wchar_t={unsigned short}>" has already been defined class integer_traits<unsigned short> ^ compilation aborted for D:\X Mes Documents X\Mes Programmes\VisualC++ 6\random boost 1\random-1.cpp (code 2) Error executing cl.exe. random boost 1.exe - 1 error(s), 0 warning(s) Would anybody have already seen it? errors on template class who have multiples definitions on the header "integer_traits.hpp". The compiler don't accept surcharge of template class. Perhaps there is an option for the compiler. What do you think about this ? After this problem, I test with msvc++6 sp5 + service pack processor 5 and... Compiling... random-1.cpp C:\BOOST_1_31_0\boost/random/uniform_01.hpp(34) : fatal error C1001: INTERNAL COMPILER ERROR (compiler file 'msc1.cpp', line 1794) Please choose the Technical Support command on the Visual C++ Help menu, or open the Technical Support help file for more information Error executing cl.exe. random boost 1.exe - 1 error(s), 1 warning(s) it gives me an error fatal with no information on Technical Support of VC6. I ask me if the problem is linked at the service pack 5 for msvc and service pack 5 for processor ( http://msdn.microsoft.com/vstudio/downloads/tools/ppack/download.aspx ),I have install. Someone have installed this pack ? Thanks for your responses. heinquoi

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Re: Building boost under mingw: bjam invokes VC7?? (part III: dat a)
by Brewer, Christopher 14 Jul '04

14 Jul '04

David- When you asked me to run the following lines: bjam -f- "-sTOOLS=mingw" install ECHO $(TOOLS) ; ^Z I see the following: bjam -f- "-sTOOLS=mingw" install (hundreds of lines of error text go by here) ECHO $(TOOLS) ; reply is: sh: ./TOOLS: is a directory ...and nothing is displayed after entering ctrl-Z :) The reply to ECHO $(TOOLS) ; seems odd. I doubt that this is what you were expecting. There *is* a 'tools' directory under boost_1_31_0, but not a 'TOOLS' directory. Case-sensitivity issues? I have also run the following: bjam -d+5 "-sTOOLS=mingw" install > bug.out Note that not everything is captured in 'bug.out'. I see hundreds of lines of the following on the console: The system cannot find the path specified. This is not surprising as I don't have VC7 installed. Unfortunately I don't have a place to publicly park the compressed 'bug.out' file so I will email it directly to you. However, here's the first few lines if that's of any help. (BEGIN LISTING===============) --------------------------------------------------------------------- skipping Boost.Python library build due to missing or incorrect configuration couldn't find Python.h in "c:/tools/python/include" You can configure the location of your python installation by setting: PYTHON_ROOT - currently "c:/tools/python" PYTHON_VERSION - The 2-part python Major.Minor version number (e.g. "2.2", NOT "2.2.1") - currently "2.2" The following are automatically configured from PYTHON_ROOT if not otherwise set: PYTHON_LIB_PATH - path to Python library object; currently "c:/tools/python/libs" --------------------------------------------------------------------- ...found 5266 targets... ...updating 632 targets... vc-C++ bin\boost\libs\date_time\build\boost_date_time.dll\vc7.1\debug\greg_month.ob j CALL "C:\Program Files\Microsoft Visual Studio .NET 2003\VC7\bin\VCVARS32.BAT" >nul "C:\Program Files\Microsoft Visual Studio .NET 2003\VC7\bin\cl" /Zm800 -nologo -GX -c -DBOOST_DATE_TIME_POSIX_TIME_STD_CONFIG -DBOOST_ALL_DYN_LINK=1 /Z7 /Od /Ob0 /GX /GR /MDd /Op /Zc:forScope /Zc:wchar_t -I"bin\boost\libs\date_time\build" -I"C:\msys\1.0\share\boost_1_31_0" -Fo"bin\boost\libs\date_time\build\boost_date_time.dll\vc7.1\debug\greg_mont h.obj" -Tp"C:\msys\1.0\share\boost_1_31_0\libs\date_time\build\../src/gregorian/gre g_month.cpp" ...failed vc-C++ bin\boost\libs\date_time\build\boost_date_time.dll\vc7.1\debug\greg_month.ob j... (SNIP============== as this error apparently occurs for every single file) Best regards, Chris Brewer (Company-mandated disclaimer) This message originates from WMS Gaming Inc. It contains information which may be confidential or privileged and is intended only for the individual or entity named above. It is prohibited for anyone else to disclose, copy, distribute or use the contents of this message. All personal messages express views solely of the sender, which are not to be attributed to WMS Gaming Inc., and may not be copied or distributed without this disclaimer. If you received this message in error, please notify us immediately at (847) 785-3000.

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Source of Boost Graph Library
by JONATHAN JAMES HITCHCOCK 14 Jul '04

14 Jul '04

Please can anyone tell me where to find the source files for the Boost Graph Library? I downloaded boost_1_31_0.tar.gz and expected to find the source files in boost-1.31.0/libs/graph/src, but the only files there are for something called graphviz.

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shared_ptr: LWM versus atomic_count?
by Caleb Epstein 14 Jul '04

14 Jul '04

I've been perusing the source code of <boost/shared_ptr.hpp> and noticed that it uses the <boost/detail/shared_count.hpp> class to do reference counting and not <boost/detail/atomic_count.hpp> (unless BOOST_NO_MEMBER_TEMPLATES or BOOST_MSVC6_MEMBER_TEMPLATES are defined). Can anyone comment on the reasoning behind using a lightweight mutex-protected counter instead of an atomic counter? I'd think that an atomic counter would be faster, but I suspect that there is a good reason for protecting the count with a mutex. This then begs the question of why use the atomic counter in the situations mentioned above? Thanks. -- Caleb Epstein caleb.epstein(a)gmail.com

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need help building on AIX 5.1
by Jim Edwards 13 Jul '04

13 Jul '04

Hi, Beginning at the top, apparently my cpp doesn't like the syntax of BOOST_TESTED_AT(0x531) : xlc-C++-action bin/boost/libs/python/build/libboost_python.so/vacpp/debug/numeric.o "/home/jedwards/cvs_src/boost/boost/iterator/detail/config_def.hpp", line 28.39: 1540-0827 (S) The constant expression on the #if directive contains a syntax error at "BOOST_TESTED_AT". -- Jim Edwards jedwards(a)ucar.edu IBM Applications Analyst NCAR SCD BOULDER CO 303-497-1842

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building boost under mingw: bjam invokes VC7??
by Brewer, Christopher 13 Jul '04

13 Jul '04

Hello, all- I recently attempted to build and install boost 1.31.0 using msys (i.e., mingw). I enter the boost directory and start bjam with: bjam -sTOOL=mingw install ...and then I see bjam invoking vc7 instead of gcc. For example: "C:\Program Files\Microsoft Visual Studio .NET 2003\VC7\bin\cl" ... followed by many, many errors, as VC7 is not installed on my system. I don't understand why bjam thinks it should be using VC7. Can anyone offer any advice or a workaround? I'm using the latest version of both msys and mingw under Windows 2000, and mingw is installed *under* msys, if that makes a difference. Regards, Chris Brewer (Company-mandated disclaimer) This message originates from WMS Gaming Inc. It contains information which may be confidential or privileged and is intended only for the individual or entity named above. It is prohibited for anyone else to disclose, copy, distribute or use the contents of this message. All personal messages express views solely of the sender, which are not to be attributed to WMS Gaming Inc., and may not be copied or distributed without this disclaimer. If you received this message in error, please notify us immediately at (847) 785-3000.

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Limitation of boost::protect of Boost.Bind
by Sigg＠inf.ethz.ch 13 Jul '04

13 Jul '04

Hi, I would like to bind a function which takes a boost::function<void> as parameter, let's say void caller(boost::function<void (void)>& f) { f(); } void foo() {} boost::function<void (void)> foo_fun = &foo; boost::bind(caller, foo_fun)(); But what if the function has a parameter, for example void bar(int i) {} How can I create the folling a function object? boost::function<void (int)> The function object should take an int, bind it to bar and then call caller with the resulting nullary function. boost::function<void (int)> bar_fun = &bar; // doesn't work because caller and bar are being composed. boost:bind(caller, boost::bind(bar_fun, _1)) // doesn't work because caller doesn't accept a unary function. boost:bind(caller, boost::protect(boost::bind(bar_fun, _1))) Does anyone have a clean solution for that? boost::protect doesn't provide the option to evaluate the arguments (_1) but _not_ perform a composition. Regards, Christian

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RE: [Boost-users] building boost under mingw: bjam invokes VC7??
by Ben Hutchings 13 Jul '04

13 Jul '04

Christopher Brewer <cbrewer(a)wmsgaming.com> wrote: > I recently attempted to build and install boost 1.31.0 using > msys (i.e., mingw). > I enter the boost directory and start bjam with: > > bjam -sTOOL=mingw install > > ...and then I see bjam invoking vc7 instead of gcc. <snip> The variable is called TOOLS, not TOOL.

1 0

Fw: Parser error from semantic actions
by Hermann Oliveira Rodrigues 12 Jul '04

12 Jul '04

Hi, How can I inform an error from a semantic action? Consider the following code: rule = IDENTIFIER[ callback_a( m_varBinder, &VarBinder::bind ) ]; callback_a is an actor allowing member calls in semantic actions. VarBinder::bind receives an identifier and try to locate it in an external symbol table. If bind fails, I like to inform a parser error back to Spirit. How can I do that? Pointers to the relevant parts in the documentation are welcome. Hermann [My apologies for sending a Spirit specific question to boost-users lists. However, I getting an administrative error from the sourceforge mail server]

3 2

Help with tuples - repeated members
by John.Wismar＠autozone.com 12 Jul '04

12 Jul '04

I've been playing with Boost's tuples library, but I'm having some trouble working through a wrinkle: I have some routines that use tuple<int>, tuple<int, int>, etc., up to tuple<int, int, int, int, int>. I'd like to be able to declare these objects using an alternative notation, along the lines of: tuple_clone<int, 1>, tuple_clone<int, 2>, tuple_clone<int, 3>, etc. The objective would be to allow me to write a function template that looked something like this: template <int N> tuple_clone<int, N> fn(tuple_clone<int, N-1> t) { tuple_clone<int, N> ret; ret.get_head() = getValue(); ret.get_tail() = t; return ret; } Each time I try to write tuple_clone, though, I end up stumped. Is it possible to write something like this, while leveraging the tuples library? Or is there a different approach I ought to look into? Thanks! -------------------------------- John Wismar john.wismar(a)autozone.com ------------------------------------------------------------------------ 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 1

FW: "memory access violation" in boost::serialization
by Dirk Griffioen 12 Jul '04

12 Jul '04

Hi, I encountered the following little problem: I would like to use the following datastructures with boost::serialize: struct Match {}; typedef std::string Key; typedef tst< Match, Key > TernarySearchTree; //this one has a shared_ptr typedef std::vector< TernarySearchTree > Trees; typedef std::map< std::string, Trees > Symbols; I have defined some serialize overloads so saving goes fine, but when loading I get a "memory acces violation" inside the following code: { boost::archive::text_iarchive ia(ifs); ia >> symbols_; } More specific, inside <boost/serializiton/shared_count.hpp> void add_ref_copy() { #if defined(BOOST_HAS_THREADS) mutex_type::scoped_lock lock(mtx_); #endif ++use_count_; } Which constructs a scoped_lock, and there, the "explicit scoped_lock(lightweight_mutex & m): m_(m)" seems to go wrong. What could be the reason? The more since all worked fine (saving and loading) when I used a simple vector of tst's. Is it not possible to use a map of string/vector (the error seems to suggest the library failing when copying vector to map - eg ++use_count of the shared_ptr inside the TST). Thanks in advance, Dirk

1 0

Re: Sun Solaris Forte 8 and boost_1_31_0
by Yaron Hirsch 12 Jul '04

12 Jul '04

Hi, I've also tried to compile RegEx with Forte 8. Did you try that? I think I managed to get things to compile, but unfortunately, when I try to compile it in 64-bit mode, we still get problems. Is there any chance you've tried compiling it in 64-bits? Thanks. "Christopher Currie" <codemonkey(a)gmail.com> wrote in message news:<cc43hj$8kl$1(a)sea.gmane.org>... > Tom Aratari wrote: > > > Tell me about it! I have to cross platform compile many things, and > > templating on Forte is not fun. But the template support > > in Forte 8 is MUCH improved over 7.2 .. The syntax is weird but I have > > gotten things to compile. > > Patches are always welcome ... :-) > > -- > Christopher Currie <codemonkey(a)gmail.com>

2 1

Problem about build regex under win32 using stlpot5.0
by huangliang 12 Jul '04

12 Jul '04

Recently I begin to use stlport in my programs, and I want to build boost regex under win32 using vc6 and stlport 5.0. But when I build them,the following errors occurs: C:\lib\boost-1.30.2\libs\regex\build>set MSVCDIR= D:\Program Files\Microsoft Visual Studio\VC98\Bin C:\lib\boost-1.30.2\libs\regex\build>set STLPORT_PATH=E:/HuangLiang/c++stl/STLport-5.0-1031 C:\lib\boost-1.30.2\libs\regex\build>nmake -fvc6-stlport.mak cl /nologo /MT /W3 /GX /O2 /GB /GF /Gy /IE:/HuangLiang/c++stl/STLport-5.0-1031\stlport /I..\..\..\ /D_MT /DWIN32 /DNDEBUG /D_MBCS /D_LIB /YX /FD /c -Fpvc6-stlport/boost_regex_vc6-stlport_mss/boost_regex_vc6-stlport_mss.pch -Fo./vc6-stlport/boost_regex_vc6-stlport_mss/ -Fdvc6-stlport/boost_regex_vc6-stlport_mss.pdb ../src/cpp_regex_traits.cpp cpp_regex_traits.cpp ../src/cpp_regex_traits.cpp(662) : error C2660: 'isspace' : function does not take 2 parameters ../src/cpp_regex_traits.cpp(662) : fatal error C1903: unable to recover from previous error(s); stopping compilation After I searched msdn, I found that isspace have been defined at 2 places: isspace template<class E> bool isspace(E c, const locale& loc) const; The template function returns use_facet< ctype<E> >(loc). is(ctype<E>:: space, c). and in ctype.h. I remember when I compile regex using vc6 without stlport, no same errors occured. I need some help about what has happened with me. Thank you !

1 0

RE: [Boost-users] Generic Class Factory
by Mark Loew 09 Jul '04

09 Jul '04

I have been looking at Andre Alexandrescu's book Modern C++ Design. He has the Loki library in there. That has all of the pieces that are needed. Does anyone know of any issue with mixing Boost, ATL and Loki? A side question is has anyone looked at merging the Loki library into the Boost library. It seems like a really great fit as the Loki library deals with a different set of problems. Mark Loew, MCSD, MCSE Application Development Consultant Sagestone Consulting www.sagestone.com Grand Rapids, MI 616-954-9556 x149 Microsoft Gold Certified Partner mloew(a)sagestone.com -----Original Message----- From: boost-users-bounces(a)lists.boost.org [mailto:boost-users-bounces@lists.boost.org] On Behalf Of Peter Dimov Sent: Thursday, July 08, 2004 7:41 AM To: boost-users(a)lists.boost.org Subject: Re: [Boost-users] Generic Class Factory Mark Loew wrote: > I have to create a class factory and was looking for a generic class > factory that I could work with. I looked in the boost documentation > but didn't find anything. Is there something there that I am missing > or do I need to roll my own? Depending on your needs, map< string, function< shared_ptr<Base>() > > may suffice. _______________________________________________ Boost-users mailing list Boost-users(a)lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

1 0

Failed build using vc7.1
by Owen Jacobson 09 Jul '04

09 Jul '04

Salve. I'm trying to use boost.threads in my project, as they look like the cleanest cross-platform threading interface I've seen in a while, and I'm running into a wee problem convincing the libraries to build. My setup: Windows 2000 SP 4 Microsoft Visual C++ 7.1 (C:\Program Files\Microsoft Visual Studio .NET 2003\VC7\) MS SDK (U:\Program Files\Microsoft SDK) Boost 1.31.0 (C:\boost_1_31_0, installing to C:\boost) Cygwin is installed, but not present in PATH; I am not using cygwin to build this project, only to run PostgreSQL. Python is not installed, as I have no need for it. Visual C++ 6.0 is also installed (for legacy projects), but not present in PATH. bjam is present in PATH, as downloaded from Sourceforge. C:\boost_1_31_0> bjam -v Boost.Jam Version 3.1.9. OS=NT. Attempting to run bjam results in a lengthy list of errors: -- long paste -- C:\boost_1_31_0> bjam -sTOOLS=vc7.1 --------------------------------------------------------------------- skipping Boost.Python library build due to missing or incorrect configuration (...) --------------------------------------------------------------------- ...patience... ...found 5266 targets... ...updating 747 targets... MkDir1 bin MkDir1 bin\boost MkDir1 bin\boost\libs MkDir1 bin\boost\libs\date_time MkDir1 bin\boost\libs\date_time\build MkDir1 bin\boost\libs\date_time\build\boost_date_time.dll MkDir1 bin\boost\libs\date_time\build\boost_date_time.dll\vc7.1 MkDir1 bin\boost\libs\date_time\build\boost_date_time.dll\vc7.1\debug vc-C++ bin\boost\libs\date_time\build\boost_date_time.dll\vc7.1\debug\greg_month.ob j The system cannot find the path specified. The system cannot find the path specified. CALL "C:\Program Files\Microsoft Visual Studio .NET 2003\VC7\bin\VCVARS32.BAT" >nul "C:\Program Files\Microsoft Visual Studio .NET 2003\VC7\bin\cl" /Zm800 -nologo -GX -c -DBOOST_DATE_TIME_POSIX_TIME_STD_CONFIG -DBOOST_ALL_D YN_LINK=1 /Z7 /Od /Ob0 /GX /GR /MDd /Op /Zc:forScope Zc:wchar_t -I"bin\boost\libs\date_time\build" -I"C:\boost_1_31_0" -Fo"bi n\boost\libs\date_time\build\boost_date_time.dll\vc7.1\debug\greg_month.obj" -Tp"C:\boost_1_31_0\libs\date_time\build\../src/gregorian/greg_month.cpp" ...failed vc-C++ bin\boost\libs\date_time\build\boost_date_time.dll\vc7.1\debug\greg_month.ob j... -- end paste -- (There is a complete build log at <http://machinae.lionsanctuary.net/2004/07/boost-log> (424KB).) What is vc-C++ doing and where can I find it? There is no file with that string in the name anywhere in the boost tree. As far as I can tell, it fails to build any object files at all. Any suggestions? Owen

3 2

mpl::vector -> boost::tuple
by Markus Werle 09 Jul '04

09 Jul '04

Hi! The example in libs/mpl/example/tuple_from_list.cpp and gen_linear_hierarchy from http://aspn.activestate.com/ASPN/Mail/Message/boost/1166644 template< typename Types, typename Unit, typename Root = mpl::none > struct gen_linear_hierarchy { typedef typename mpl::fold<Types,Unit,Root> ::type type; // here }; /* usage example: template< class Base, class T > struct EventHander : public Base { virtual void OnEvent(T& obj, int eventID) = 0; }; typedef gen_linear_hierarchy< mpl::list<Window,Button,ScrollBar> , EventHander<_1,_2> > ::type v; */ all seem to me work fine with default constructible types. What I need is a type generator which provides a constructor, such that code like this one works for mpl::vectors (or other mpl::sequences) with arbitrary length: ------------- class C { C(std::string const & gaga) {} }; struct gen_linear_hierarchy_with_constructor // your idea missing here { // and here }; typedef gen_linear_hierarchy_with_constructor<mpl::vector<C, C> >::type mytuple; mytuple mt("test", "Thanks for your help"); ------------------ Markus P.S.: David and Aleksey, if you read this here: I could not find your "coming soon" book at awprofessional.com. What's the current state of the book I wait for so long already ...

4 8

Relational DB Model Tools
by Hossein Haeri 09 Jul '04

09 Jul '04

Dear all, I wonder knowing where the "Relational Database Model" stuff are in the boost repository. How knows? Thanks a lot, --Hossein __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

3 4

Adapting Iterator Adaptor
by Duane Murphy 08 Jul '04

08 Jul '04

We are still using boost 1.27. We are getting to the point that there are features of the latest boost release that we want to use. Of course there are barriers. One barrier is iterator_adaptor. Iterator_adapter went through a significant rewrite. We have several (>10) iterators written using the older implementation. We are trying to gauge the impact of changing to the latest boost. Do we need to largely rewrite these iterators? Is the interface close enough for this to be a reasonably simple task? Simply how do we get our old iterators to the new adaptor? Thanks for the help, ...Duane

2 2

Generic Class Factory
by Mark Loew 08 Jul '04

08 Jul '04

I have to create a class factory and was looking for a generic class factory that I could work with. I looked in the boost documentation but didn't find anything. Is there something there that I am missing or do I need to roll my own? Mark Loew, MCSD, MCSE Application Development Consultant Sagestone Consulting www.sagestone.com <http://www.sagestone.com/> Grand Rapids, MI 616-954-9556 x149 Microsoft Gold Certified Partner mloew(a)sagestone.com

2 1

RE: [Boost-users] Generic Class Factory
by Jim.Hyslop 07 Jul '04

07 Jul '04

Mark Loew wrote: > I have to create a class factory and was looking for a > generic class factory that I could work with. I looked in > the boost documentation but didn't find anything. Is there > something there that I am missing or do I need to roll my own? It's not part of boost, but have a look at: http://www.cuj.com/documents/s=7994/cujcexp1906hyslop/ There's a follow-up in the July and August, 2003 print editions of CUJ. -- Jim Hyslop Senior Software Designer Leitch Technology International Inc. (http://www.leitch.com) Columnist, C/C++ Users Journal (http://www.cuj.com/experts)

1 0

Feature request for boost::filesystem
by Delfin Rojas 07 Jul '04

07 Jul '04

Hello everybody, I'm new to this mailing list. The first thing I should say is I love boost and I think it is a great library and I'm really thankful to all its contributors. Now, that being said, I'm sending this email to ask about a feature in the boost::filesystem library that I believe would be valuable to have. Currently the only library that supports file and directory operations in boost is boost::filesystem. Thanks tot hat library I don't have to use platform specific file manipulation rutines for things like copying a file, deleting all files in a directory, iterating through a directory, etc. Now, all the operations in boost::filesystem take a boost::filesystem::path as an object encapsulating a platform independent "path" to a file or a directory. My problem is this path can only be built using a single char (ANSI) character string. This doesn't allow me to use boost::filesystem in windows with Unicode support since I cannot convert a wide string (UTF16) path to a boost::filesystem::path object. I believe it must not be too difficult to add Unicode path support to boost::filesystem since only the "path" class would need to be modified I think. Another small feature I think could be interesting is a convenience function to set the current path (cd operation). There is a function already to get the current path but not to set it. I do not know if this is the right group to ask for these features. If not please point me in the right direction. Thanks a lot Delfin Rojas Delfin(a)moodlogic.com

15 51

RE: [Boost-users] Problem with boost random library.
by Tom Matelich 07 Jul '04

07 Jul '04

This is totally a shot in the dark, but the last time I had this problem, my static class members inside a gcc library were not getting constructed because I wasn't using gcc as my linker. Perhaps those two have static non-POD members and the others don't. > -----Original Message----- > From: boost-users-bounces(a)lists.boost.org > [mailto:boost-users-bounces@lists.boost.org] On Behalf Of > Joshua Little > Sent: Saturday, July 03, 2004 8:09 PM > To: boost-users(a)lists.boost.org > Subject: Re: [Boost-users] Problem with boost random library. > > > Just to make sure I answer my own mails as much as possible. > I tried a > few different random generators. Rand48, mt11213b, and > minstd_rand and > they all worked inside of my game. So it seems like mt19937 and the > lagged_fibonacci's are causing the problem. So obviously I > can use one > of the other generatrors but its still bothers me that the > mt19937 and > lagged_fibonaccis generators segfaults for reasons that are > not apparent > to me. Maybe this information will help give ideas to anyone > who might > know what might be wrong, maybe there is a difference between the > generator types that might be causing the problem? > Thanks, > Joshua. > _______________________________________________ > Boost-users mailing list > Boost-users(a)lists.boost.org > http://lists.boost.org/mailman/listinfo.cgi/bo> ost-users > ----------------------------------------------------------------------- DISCLAIMER: Information contained in this message and/or attachment(s) may contain confidential information of Zetec, Inc. If you have received this transmission in error, please notify the sender by return email. -----------------------------------------------------------------------

1 0

thread and Mac OS X
by Tristan King 07 Jul '04

07 Jul '04

i've written a little test to see if i've installed boost properly on my mac #include <boost/thread.hpp> #include <boost/shared_ptr.hpp> #include <boost/bind.hpp> #include <iostream> void simple_thread( boost::shared_ptr<int> p ) { std::cout << (*p) << std::endl; } int main (int argc, char * const argv[]) { boost::thread_group threads; for ( int i = 0 ; i < 5 ; i++ ) { boost::shared_ptr<int> p( new int(i) ); threads.create_thread( boost::bind( &simple_thread, p ) ); } threads.join_all( ); return 0; } in xcode (a C++ Tool project) this compiles fine, however on runtime i get the following error: ZeroLink: unknown symbol '__ZN5boost12thread_groupC1Ev' boost_test has exited due to signal 6 (SIGABRT). using g++ i get the following errors (ignoring warnings) g++ main.cpp -o boost_test -I/usr/local/include/boost-1_31 -L/usr/local/lib ld: Undefined symbols: boost::thread_group::create_thread(boost::function0<void, std::allocator<boost::function_base> > const&) boost::thread_group::join_all() boost::thread_group::thread_group[in-charge]() boost::thread_group::~thread_group [in-charge]() i originally built boost using the command line sudo bjam -sTOOLS=darwin install can anyone help me with what i am missing here? thanks --Tristan

2 1

RE: [Boost-users] [pool] Speed of pool_allocator<>
by Klaus Nowikow 06 Jul '04

06 Jul '04

Peter Dimov wrote: > Klaus Nowikow wrote: > > template <class Allocator> > > double Test() > > { > > std::vector<Allocator::value_type, Allocator> Vector; > > boost::timer Timer; > > > > for(int i = 0; i < NUM_ELEMENTS; ++i) > > { > > Vector.push_back(i); > > } > > > > return Timer.elapsed(); > > } > > If I read the code correctly, you don't create or delete > objects. You create > and delete (large) arrays of objects. I changed the test program (see below). Now I use object_pool<> to create and destroy a number of elements (I use a vector<C*> to store them in the meantime). The results are even worse than before: new/delete: 0.08s object_pool: 25.20s Note that I created a class non_pool with an interface similar to object_pool to be able to use one function template for both tests. // MemoryPoolTest.cpp #include <boost/timer.hpp> #include <boost/pool/object_pool.hpp> #include <vector> #include <iostream> enum { NUM_ELEMENTS = 100000 , CHUNK_SIZE = NUM_ELEMENTS }; class C { int i_; char c_; }; struct Empty { }; template <class T, class U = Empty> struct non_pool // create, destroy with new and delete { explicit non_pool(int) { } T* construct() const { return new T; } void destroy(T* pT) { delete pT; } }; template <template <class, class> class Pool> double Test() { Pool<C> P(CHUNK_SIZE); boost::timer Timer; std::vector<C*> V; for(int i = 0; i < NUM_ELEMENTS; ++i) { V.push_back(P.construct()); } for(std::vector<C*>::iterator pos = V.begin(), end = V.end(); pos != end; ++pos) { P.destroy(*pos); } return Timer.elapsed(); } int main(int, char**) { std::cout << "Starting memory pool test" << std::endl; double Time; std::cout << "Allocating with new : "; Time = Test<non_pool>(); std::cout << Time << "s" << std::endl; std::cout << "Allocating with boost::object_pool<>: "; Time = Test<boost::object_pool>(); std::cout << Time << "s" << std::endl; return 0; }

3 2

errors building boost on Mac OS X
by Tristan King 06 Jul '04

06 Jul '04

Hi, i get a few errors when building the following libraries on Mac OS X 10.3.4 libboost_test_exec_monitor libboost_unit_test_framework i'm building using bjam, and the following command line bjam -sTOOLS-darwin install sniplets of the errors are as follows: darwin-Link-DyLib-action bin/boost/libs/test/build/libboost_prg_exec_monitor.dylib/darwin/debug/shared-linkable-true/libboost_prg_exec_monitor-d-1_31.dylib ld: Undefined symbols: cpp_main(int, char**) .... darwin-Link-DyLib-action bin/boost/libs/test/build/libboost_test_exec_monitor.dylib/darwin/debug/shared-linkable-true/libboost_test_exec_monitor-d-1_31.dylib ld: Undefined symbols: test_main(int, char**) .... darwin-Link-DyLib-action bin/boost/libs/test/build/libboost_unit_test_framework.dylib/darwin/debug/shared-linkable-true/libboost_unit_test_framework-d-1_31.dylib ld: Undefined symbols: init_unit_test_suite(int, char**) am i missing something here? thanks --Tristan

1 0

Problem using exported C++ functions to python
by mayankg＠iiitb.ac.in 06 Jul '04

06 Jul '04

Hi, I have the following type of functions in a class say "MyClass", which I have exported to python. 1) func1(long *plong) 2) func2(TempClass **pptempclass) (where TempClass is some other class) Now, I exported these using the following: .def("func1", &MyClass::func1) .def("func2", &MyClass::func2) and it compiled well. But now when I try to use them in a python script, I have no clue as to how I create and pass: 1) a long pointer as argument to func1 2) a double pointer to TempClass as argument to func2 How do I achieve this behaviour? 1) Do I have to wrap the above functions> If yes, then how? How will they be used in python then? OR 2) I can still use the same functions in python but then how to create (instantiate and initialize) the above pointers in python? Thanks, Mayank

2 1

RE: [Boost-users] Re: detect unneded includes
by Ben Hutchings 05 Jul '04

05 Jul '04

Adrian Stoica <adrian_stoica(a)btinternet.com> wrote: > I'm not aware of any such tools, but it could be done with a Perl > script that removes the includes one at a time, and then invokes the > compiler. If the file compiles ok, it's probably safe to remove that > include. No, unfortunately not. A header might appear to be redundant because it is included by another, yet this may be a mere implementation detail which is subject to change and should not be relied upon. In the absence of a true module system this is impossible to determine. Also it could be that the header defines template specialisations, or macros with the same names as functions/objects. Removing such a header might not make the program ill-formed but could still break it subtly. Instantiating a template in one translation unit for the same template arguments for which there is an explicit specialisation in another translation unit results in undefined behaviour. With sufficient testing you can *probably* avoid such mishaps but I would be very wary of trying to automate this.

1 0

newbie: need example (call python from c++)
by Peter Piehler 04 Jul '04

04 Jul '04

Hello, I use call<void>(pyFunc,arg1,..) to call a python function with standard double, int etc. What must I do to call a function with a c++ object as argument? psydocode: class MyAnimal { /*...*/ std::string __strName; public: MyAnimal() : __strName("Tux") {} /*...*/ std::string getName() { return __strName;} void setName(const std::string &strName) { __strName = strName; } }; int main() { /*...*/ MyAnimal* pTux = new Animal; /*do something with pTux*/ /*use a python function with pTux*/ call<void>(pyFunc1, ?pTux? ); /*change attributes pTux in pyFunc2*/ dog = call<MyAnimal>(pyFunc2, ?pTux?); /*if it possible to call by reference?*/ call<void>(pyFunc3, ?pTux?); pTux->getName();// return Cat } python module: def py_func1(a): print a.getName() def py_func2(a): a.setName('Dog') return a def py_funnc3(a): a.setName('Cat') ___________________________________________________________ Gesendet von Yahoo! Mail - Jetzt mit 100MB Speicher kostenlos - Hier anmelden: http://mail.yahoo.de

2 1

Problem with boost random library.
by Joshua Little 04 Jul '04

04 Jul '04

Hi all, I'm trying to use the randome number generators but I am having some problems. I'm using boost 1.31.0 and gcc 3.2 on Windows 2000. Here is my code : printf(" Die \n "); //std::cout << "Die Rolls" << std::endl; try { boost::mt19937 rng; // produces randomness out of thin air // see pseudo-random number generators boost::uniform_int<> six(1,6); // distribution that maps to 1..6 // see random number distributions boost::variate_generator<boost::mt19937, boost::uniform_int<> > die(rng, six); // glues randomness with mapping int x = die(); printf(" Die %d\n ",x); } catch(...) { std::cout << "exception" << std::endl; printf(" Die exception \n "); } I basically copied the example code off the web site to see if I could get it to work but I'm not having any luck. If I have the variate_generator defined as above I do not not get any output to the console after the declaration of die. I tried printf's and stream output but neither works, I never see the "Die %d" printed out and I do not see either of the outputs in the catch(...) section. printed either. I even had a throw in the try block at one time to see if it could get to the catch section and did not see output. When I remove the die declaration (and comment out the code that uses it) but leave the generator and the distribution then I can see output again and if I throw after the distribution declaration then I see both output statements in the catch block. So it seems like if I have the variate generator declared then I can't see any output after that, but when I comment it out I can see output again. I'm not sure what I'm doing wrong since I am basically copying a pretty simple example from the book I just can't get it to work. Ah and just incase this makes a difference I'm running this code as a test case in a boost test suite. I wanted to try to get it to work there before putting it into my main app. Thanks, Joshua.

2 5

building boost program options
by Christopher Baus 03 Jul '04

03 Jul '04

I'm trying to build the boost sandbox project program_options and am failing. Anyone know what version of boost is compiles cleanly with? -- Christopher Baus http://www.baus.net/

3 2

RE: [Boost-users] Re: boost test doesn't track validation outside autofunctions
by Rozental, Gennadiy 02 Jul '04

02 Jul '04

> > > void validate(X args) { > > > if (some tests) > > > BOOST_ERROR("message"); > > > } > > > BOOST_AUTO_UNIT_TEST(testfunction) { > > > // set up arguments > > > validate(args) > > > } [...] > I think the problem is a think-o on my part. > In the pseudo-code above, BOOST_ERROR is not executed unless > "some tests" is true. So if the tests are OK, BOOST_ERROR is > never hit. > > I think the report of 0 (boost) tests being run is therefore > accurate, though confusing. It should actually say that 1 test cases being run, but no assertions executed. > Does that sound right? > > Is there a way to signal to boost that you are doing a test, > without the error? You have 2 choices. 1. Rewrite your test, so that it looks like: ... BOOST_CHECK_MESSAGE( some_test, "message" ); 2. Or you could write it like this: .... If(some_test) BOOST_ERROR("message") else BOOST_MESSAGE( "no error" ); I prefer first solution usually. HTH, Gennadiy

2 1

boost test doesn't track validation outside auto functions
by Ross Boylan 02 Jul '04

02 Jul '04

I have a test program that looks like this, in stylized form: -------------------------- #include <boost/test/auto_unit_test.hpp> using namespace boost::unit_test_framework; void validate(X args) { if (some tests) BOOST_ERROR("message"); } BOOST_AUTO_UNIT_TEST(testfunction) { // set up arguments validate(args) } ---------------------------------- When I run this with report-level detailed, it reports that there are 0 assertions in testfunction. Furthermore, the assertions done in validate are not even added to the overall number of assertions reported for the run. I know the checks are being run, because I have seen errors from them. Also, the error messages include the name "testfunction", so it is available at run time. It would be nice if the error reporting and logging functions got their info at run-time; apparently they are grabbing it from some pre-processor magic at the moment (I haven't examined the code in detail; that's just an inference from the behavior). Since the tests do seem to be run, this is basically a cosmetic problem, but it would be nice to fix. If any easy fixes occur to anyone, I'd love to know. Boost 1.31.0 on Debian. P.S. The module's author is listed as rogeeff(a)fusemail.com in the documentation, but that address doesn't work. -- Ross Boylan wk: (415) 502-4031 530 Parnassus Avenue (Library) rm 115-4 ross(a)biostat.ucsf.edu Dept of Epidemiology and Biostatistics fax: (415) 476-9856 University of California, San Francisco San Francisco, CA 94143-0840 hm: (415) 550-1062

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Sun Solaris Forte 8 and boost_1_31_0
by Tom Aratari 02 Jul '04

02 Jul '04

Hello, Has anyone gotten boost_1_31 to compile with Forte 8.0 (__SUNPRO_CC = x550) ? I get errors for the boost::iterator. Also, does anyone know if the next release of boost will be compatible with forte 8.0? Thanks Tom

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Boost Test Tutorial
by Sebastian Stein 02 Jul '04

02 Jul '04

I have written a small tutorial how to use boost test within the KDE project. If you are interested, you will find it under: http://www.hpfsc.de/boosttest/ Sebastian -- http://www.hpfsc.de/ - die Seite rund um: Assembler, Bundeswehr, TFT LCDs, Halle/Saale, Fahrradtouren, Neuseeland, Wanderstaat Mauma, Raumschiff USS Nathan, Enemy Room, MLCAD Tutorial

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standard way to specify undefined values
by Erik Thiele 02 Jul '04

02 Jul '04

hi, i have a userdefined type "foobar". it has a special value that means "undefined". is there a standard way to specify which value is undefined? i do not want to use boost::optional here, as foobar itself can be "undefined". you know: class foobar { static const foobar undefined(blablabla); int a,b,c; } but is this "standard"? cya erik -- Erik Thiele

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RE: [Boost-users] Re: [mpl] Alexandrescu's hierarchy generators
by Klaus Nowikow 02 Jul '04

02 Jul '04

David Abrahams wrote: > [..] > template<class T, class Base> > struct node; > > typedef mpl::vector<int, char, long> types; > > // node<int, node<char, node<long, mpl::empty_base> > > > typedef mpl::inherit_linearly< > types > , node<_2,_1> > >::type lin; > [...] > HTH. That helps a lot. Thank you! -- Klaus Nowikow

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iterator_adaptor problem (mpl?)
by Angus Leeming 01 Jul '04

01 Jul '04

Consider a container such as std::vector<std::pair<int, std::string> > my_container; I want to be able to iterate over the ints of this container so, following the tutorial to the iterator_adaptor docs, came up with template <typename BaseIterator> class first_iter : public boost::iterator_adaptor< first_iter<BaseIterator>, BaseIterator, boost::use_default, boost::use_default, typename BaseIterator::value_type::first_type & > { // snip body }; This works fine so long as BaseIterator::value_type is not const, but falls over when it is because I've defined the 'super_t::reference' type to be mutable. I guess that I need a piece of metafunction magic, but my naive implementation fails typename boost::mpl::apply_if< boost::is_const<typename BaseIterator::value_type> , typename BaseIterator::value_type::first_type const & , typename BaseIterator::value_type::first_type & >::type trial.C:38: error: no type named `type' in `struct boost::mpl::apply_if< boost::is_const<std::pair<int, std::string> >, const int&, int&>' I must admit I'm a bit baffled. There plainly is a 'type' in the apply_if class template. Any pointers? I attach the code as I have it. While I'm at it, is there not something in the MPL that will return the appropriate const-qualified reference for me? None of the header file names in boost/mpl jump out and grab me, but I may well be looking in the wrong place. Regards, Angus

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RE: [Boost-users] [pool] Speed of pool_allocator<>
by Klaus Nowikow 01 Jul '04

01 Jul '04

Peter Dimov wrote: > Klaus Nowikow wrote: > > > > I changed the test program (see below). Now I use object_pool<> > > to create and destroy a number of elements (I use a vector<C*> to > > store them in the meantime). The results are even worse than before: > > > > new/delete: 0.08s > > object_pool: 25.20s > > [...] > > > template <template <class, class> class Pool> > > double Test() > > { > > Pool<C> P(CHUNK_SIZE); > > boost::timer Timer; > > > > std::vector<C*> V; > > for(int i = 0; i < NUM_ELEMENTS; ++i) > > { > > V.push_back(P.construct()); > > } > > for(std::vector<C*>::iterator pos = V.begin(), end = V.end(); pos != > > end; ++pos) { > > P.destroy(*pos); > > } > > > > return Timer.elapsed(); > > } > > Your test is still very unrealistic. You create a large > number of objects in > one batch, then destroy them afterwards. A more realistic > scenario would > have creation and destruction interleaved. > > The most accurate test would be to try Boost.Pool with your actual > application and see how it affects its real-world > performance. It's still > possible for it to be slower, of course, but at least you'd > measure the real > thing. Of course you're right. Obviously I broke the "don't optimize what does not have to be optimized" rule ;-). When creating and deleting 100000 Objects with new/delete takes only 0.1 seconds I won't have to look for something more efficient. I will do what you suggest: write my code and see if it needs optimization. Regards, Klaus

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