March 2003 - Boost-users - lists.boost.org

boost::shared_ptr and stl algorithms
by Bill Eidson 15 Apr '05

15 Apr '05

std::vector< boost::shared_ptr<T> > TVec; I want to write a function object to run std::for_each. to do somework against members of T and accumulate results in functor. My attempts have failed in VC7 with memory errors in my operator() method. struct fo { bool operator()( boost::shared_ptr<T>& t ) { return true; } }; Thanks in advance bille

5 9

BGL and reversing / moving edges
by joshrose 17 Dec '03

17 Dec '03

G'day, I was hoping someone might be able to tell me if they've run into any situations using BGL where they needed to move (or reverse (i.e. flip the source and target)) an edge within a graph implemented as an adjacency_list. I'm working on an implementation of an algorithm for max. weight bipartite matching ("the assignment problem"), and one of the assumptions in the algorithm is that non-matched edges are directed from one subgraph, A, to the other subgraph, B, and matched edges are directed the other way. Over the course of growing the matching, a simple way to add and remove edges from the candidate set is just to reverse the edge, thus the need for some way to reverse the edge within BGL. I don't think I can just remove and then re-add the edge in the other direction, primarily because doing so will (I believe) invalidate any edge_descriptors referring to that edge. In particular, there are property maps keeping track of the weight of edges, the predecessors of certain nodes, etc. that use edge descriptors as keys. I've spent a fair bit of time reading the documentation and looking through the implementation of adjacency_lists (incl. edge_list_impl), and I'm not really sure of a way to either move an edge directly within a graph, or even to create a new edge from another s.t. they have the same edge_descriptor (in general a bad thing, probably). Anyone have any thoughts on this? Thanks, -Josh

4 10

bjam and windows command line problem.
by Fernando Cacciola 07 May '03

07 May '03

Hi, I'm having a hard time trying to use bjam to build boost 1.29.0. I have Win98 in Spanish, and I use Borland C++ Builder 5.0 (its bcc32.exe corresponds to is BCC5.5.1) I have boost 1.29.0 installed at: "C:\Libraries\boost\Repository\boost" I've downloaded bjam for Microsoft Windows: >bjam -v Boost.Jam Version 3.1.0. OS=NT. Copyright 1993-2002 Christopher Seiwald and Perforce Software, Inc. Copyright 2001 David Turner. Copyright 2001-2002 David Abrahams. I've temporarily modified the root 'jamfile' so that it builds only the Test library. and I've done: subst d: "c:\archivos de programa\borland\cbuilder5" set BCCROOT=d: (you'll see why in a moment) If I try: c:\>cd C:\Libraries\boost\Repository\boost" C:\Libraries\boost\Repository\boost> bjam -sTOOLS=borland I receive messages of the form: borland-C++-action libs\test\build\bin\libpem.lib\borland\debug\runtime-link-static\threading-s ingle\execution_monitor.obj "d:\bin\bcc32" -j5 -q -c -P -w -Ve -Vx -a8 -v -Od -vi- -tWC -WM- -w-8001 -I"libs\test\build" -I"C:\Libraries\boost\Repository\boost" -I"d:\includ e" -o"libs\test\build\bin\libpem.lib\borland\debug\runtime-link-static\thre ading-single\execution_moni Error E2266: No file names given tor.obj" "libs\test\build\../src\execution_monitor.cpp" C:\WINDOWS\TEMP\JAMTMP00.BAT [2] Unknown command "TOR.OBJ" "LIBS\TEST\BUILD\.." "d:\bin\bcc32" -j5 -q -c -P -w -Ve -Vx -a8 -v -Od -vi- -tWC -WM- -w-8001 -I"libs\test\build" -I"C:\Libraries\boost\Repository\boost" -I"d:\includ e" -o"libs\test\build\bin\libpem.lib\borland\debug\runtime-link-static\thre ading-single\execution_monitor.obj" "libs\test\build\../src\execution_monitor.cpp" ...failed borland-C++-action libs\test\build\bin\libpem.lib\borland\debug\runtime-link-static\threading-s ingle\execution_monitor.obj... If I'm interpreting this output correctly, the problem is that the command line feed to bcc32 exceeds 256 characters. What can be done about this? Is there a way for 'borland-tools.jam' to put the bcc32 parameters in a tmp response file and use: bcc32.exe @tmprsp.rsp? Any help will be appreciated. TIA, -- Fernando Cacciola

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RE: [Boost-Users] How To Build Boost 1.30 With Dev-CPP?
by bjorn.karlsson＠readsoft.com 04 May '03

04 May '03

> From: firingme [mailto:yg-boost-users@m.gmane.org] > E:\LY\boost_1_30_0>bjam sTOOS=mingw This should read sTOOLS, not sTOOS. Bjorn

5 5

Understanding MPL
by Edward Diener 18 Apr '03

18 Apr '03

I am trying to understand how the MPL library works. I first read "The Boost C++ Metaprogramming Library" by Aleksey Gurtovoy and David Abrahams. When I get to Basic Usage I see this: template< typename Condition , typename T1 , typename T2 > struct if_ { typedef /*unspecified*/ type; }; I am really having trouble understanding the next to last line. How can "typedef type;" be a valid C++ construct and, if it is, what does it mean ? I always though that a typedef must specify an actual type but I don't see any in the expression above.

7 27

building boost with vc7
by oleg smolsky 03 Apr '03

03 Apr '03

Hello, I've just downloaded boost_1_30_0 and it turns out that there are two ways to build regex lib: bjam nmake /f vc7.mak However, they produce different libraries, and regex headers explicitly include ones generated by the makefile. e.g: boost_regex_vc7_mdi.lib boost_regex_vc7_mdid.lib ..... So, here are a few questions: -- why do above commands generate different libs? -- the nmake generates a full set of libs, but bjam does not, why? -- no other libs do have makefiles, why? Thanks in advance. Best regards, Oleg Smolsky Software Design Authority Allied Telesyn Research

2 1

Problems building on Mac-OSX
by Roy Smith 03 Apr '03

03 Apr '03

I'm trying to build boost 1.30 on Mac OS-X 1.2.4. I'm using the compiler that came with the system, GCC-3.1. When I do "bjam -sTOOLS=darwin", I get a variety of errors and warnings. I get the warning "enumeration value `type_pf' not handled in switch", in several places in libs/regex/src/cregex.cpp. In all cases, the offending lines are protected by ifdefs: #ifndef BOOST_REGEX_NO_FILEITER case re_detail::RegExData::type_pf: return pdata->fm[i].matched; #endif It would appear that BOOST_REGEX_NO_FILEITER should be defined in the darwin environment, but isn't. This is the first time I've just Jam, so I'm at a loss to figure out why it's not set right, or how to fix it. More importantly, I get 6 failures. The bjam output contains the following for the first one: darwin-Link-DyLib-action libs/test/build/bin/libboost_prg_exec_monitor.dylib/darwin/debug/runtime- link-static/shared-linkable-true/libboost_pr\ g_exec_monitor.dylib ld: Undefined symbols: cpp_main(int, char**) export DYLD_LIBRARY_PATH ld -dynamic -m -r -d -o "libs/test/build/bin/libboost_prg_exec_monitor.dylib/darwin/debug/runtime -link-static/shared-linkable-true/libboos\ t_prg_exec_monitor.lo" "libs/test/build/bin/libboost_prg_exec_monitor.dylib/darwin/debug/runtime -link-static/shared-linkable-true/execution_m\ onitor.o" "libs/test/build/bin/libboost_prg_exec_monitor.dylib/darwin/debug/runtime -link-static/shared-linkable-true/cpp_main.o" \ && \ c++ -static-libgcc -g -Wl,-dynamic -nostartfiles -Wl,-dylib -Wl,-ldylib1.o -Wl,-dylib_compatibility_version,1.30.0 -W,l-dylib_current_ver\ sion,1.30.0 -o "libs/test/build/bin/libboost_prg_exec_monitor.dylib/darwin/debug/runtime -link-static/shared-linkable-true/libboost_prg_exec_m\ onitor.dylib" "libs/test/build/bin/libboost_prg_exec_monitor.dylib/darwin/debug/runtime -link-static/shared-linkable-true/libboost_prg_exec_mo\ nitor.lo" \ \ \ && \ rm -f "libs/test/build/bin/libboost_prg_exec_monitor.dylib/darwin/debug/runtime -link-static/shared-linkable-true/libboost_prg_exec_monitor\ .lo" ...failed darwin-Link-DyLib-action libs/test/build/bin/libboost_prg_exec_monitor.dylib/darwin/debug/runtime- link-static/shared-linkable-true/l\ ibboost_prg_exec_monitor.dylib... Unfortunately, I'm stumped.

2 1

containers of boost::function objects
by Alisdair Meredith 02 Apr '03

02 Apr '03

I am trying to create a simple mechanism to register multiple callbacks with my class. My first simple-minded approach is to use std::list< boost::function2< [my params]> > Unfortunately, I cannot search this list to unregister callbacks, as any attempt to dereference a list::iterator tries to call the function, rather than return the function object. After spotting this problem in the standard algorithms I have been trying to hack around myself, explicitly calling operator* and even operator-> with no joy. Am I missing some easy way to get the function object out of the iterator as a value? And is this a bug in my compiler (BCB6) or a general issue for containers of function objects? -- AlisdairM

4 5

regex++ use on binary data
by brian_hernacki 01 Apr '03

01 Apr '03

Maybe a newbiew question, but is there any way to use the regex++ libary to search chunks of binary data? (or more accurately to search a buffer of data of known length for a given pattern which may itself contain null bytes) --brian

2 1

linking Signals Library
by John Fletcher 01 Apr '03

01 Apr '03

System: Red Hat 8.0 with gcc 3.2 Boost 1_30_0 I have built the boost signals library using bjam. The test suite runs and passes all tests. How do I make the resulting libraries available to my own programs? Is there an equivalent of 'make install' which will move the results to somewhere from which linking is possible? I have searched the documentation on Boost Signal and also on building libraries and have found nothing on this. Thanks John Fletcher

2 3

[Signals-1.30.0] Linking problems
by Michael Kettner 01 Apr '03

01 Apr '03

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi, I've got problems in linking against the signals-library. I built the library defining <define>BOOST_SIGNALS_NAMESPACE=boost_signals and running bjam -sTOOLS=gcc-stlport -sBUILD=release Everythinig seemed to work fine, but when I now try to link against the shared library (see attached file), I get the following undefined references: undefined reference to `boost::boost_signals::detail::signal_base_impl::connect_slot(boost::any const&, boost::any const&, _STL::vector<boost::boost_signals::trackable const*, _STL::allocator<boost::boost_signals::trackable const*> > const&)' and undefined reference to `boost::boost_signals::detail::signal_base_impl::signal_base_impl[in-charge](boost::function2<bool, boost::any, boost::any, _STL::allocator<boost::function_base> > const&)' I'm using gcc-3.2.2 and STLport-4.5.3. May it be the case that something with the STL-namespace (std) went wrong? Thanks for any help, Michael - -- Dipl.-Ing. Michael Kettner, Wissenschaftlicher Mitarbeiter Institut für Verkehrswesen, Eisenbahnbau und -betrieb, Universitaet Hannover Appelstr. 9A # Tel: ++49/(0)511/762-4273 D-30167 Hannover # Fax: ++49/(0)511/762-3001 http://www.ive.uni-hannover.de # kettner(a)ive.uni-hannover.de -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.6 (GNU/Linux) Comment: For info see http://www.gnupg.org iD8DBQE+iIILkCdGnb0kVFMRAtewAJ9+MNdRW7hs4vHHbmnuashsi22d8gCaAm8W N8FnJqbRHiqU3S0EKDixD0U= =qEMK -----END PGP SIGNATURE----- [Non-text portions of this message have been removed]

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[BGL] Problem with setS adjacency lists
by Pierre Barbier de Reuille 31 Mar '03

31 Mar '03

Hello, I want an undirected graph with non-multiple edges. So I use a graph defined as : adjacencylist<setS,vecS,undirectedS,SomeProperty> But, if I insert many times the same edge with: add_edge(2,3) add_edge(1,4) add_edge(2,3) add_edge(3,2) I obtain in fact 3 edges 2<->3 which I really don't want. Is there something else to do to avoid having multiple edges linking the same vertices ? And then, is there a way to user hash_set with g++-3.2 ? The problem being that hash_set is defined in the file ext/hash_set and in the namespace __gnu_cxx ... Thanks, -- Pierre Barbier de Reuille INRA - UMR Cirad/Inra/Cnrs/Univ.MontpellierII AMAP Botanique et Bio-informatique de l'Architecture des Plantes TA40/PSII, Boulevard de la Lironde 34398 MONTPELLIER CEDEX 5, France tel : (33) 4 67 61 65 77 fax : (33) 4 67 61 56 68

1 1

A bug in boost.lexical_cast 1.30
by Black Ice 31 Mar '03

31 Mar '03

When lexical_cast used under VC, and the option "Treat wchar_t as Build-in Type" is off The following code will cause compile error: int main(int argc, char * argv[]) { string str("10"); unsigned short n = lexical_cast<unsigned short>(str); return 0; } Because in lexical_cast::detail::widest_char, treat unsigned short as wchar_t!! -- /*******************/ ×ÔÓÉ£šliberty£©ÎÞ·ÇŸÍÊÇÕâÑùÒ»ÖÖ³ÐÅµ£ºÃ¿žöÈËœ«»áµÃµœÒ»ÖÖ±£ÕÏ£¬±£ÕÏÎÒÃÇ¿ÉÒÔÓë ÈšÍþ¡¢¶àÊý¡¢Á÷Ë×Œ°ÓßÂÛµÄÓ°ÏìÏà¿¹ºâ¡£ /*******************/

2 2

Another bug in boost.lexical_cast 1.30
by Black Ice 31 Mar '03

31 Mar '03

lexical_cast.hpp line 145: bool operator<<(const Source &input) { return stream << input; } Convert basic_stringstream & to bool? -- /*******************/ ×ÔÓÉ£šliberty£©ÎÞ·ÇŸÍÊÇÕâÑùÒ»ÖÖ³ÐÅµ£ºÃ¿žöÈËœ«»áµÃµœÒ»ÖÖ±£ÕÏ£¬±£ÕÏÎÒÃÇ¿ÉÒÔÓë ÈšÍþ¡¢¶àÊý¡¢Á÷Ë×Œ°ÓßÂÛµÄÓ°ÏìÏà¿¹ºâ¡£ /*******************/

2 2

Re: [boost] lexical_cast woes
by Terje Slettebø 30 Mar '03

30 Mar '03

>From: "Michel André" <michel.andre(a)swipnet.se> > I get the following errors when compiling with the lexical_cast version in > CVS on MSVC 7.0 do I have to enable wchar_t support on the command line or > disable it via DISABLE_WIDE_CHAR_SUPPORT or whats the solution. This problem was reported at the Boost-Users list, as well. It turns out that testing for MSVC 6, and disabling wide character support in that case, wasn't enough, as the same needs to be done if MSVC 7 is set to have wchar_t not as intrinsic type. I've therefore removed the "BOOST_MSVC <= 1200" test, again, and restored "BOOST_NO_INTRINSIC_WCHAR_T" test, which used to be, earlier. The reason the the test for MSVC was used first, was that the config for Intel C++ also defined BOOST_NO_INTRINSIC_WCHAR_T, regardless of whether it was the case or not, as the compiler didn't set a macro for it. However, it appears that the latest version of Intel C++ do get correct wide character support, when it's enabled. I've also changed bad_lexical_cast, to return the types used, in source()/target(), as given in Kevlin's suggestion (http://article.gmane.org/gmane.comp.lib.boost.devel/18240) As a small change, the warning with MSVC 7 for void * -> bool conversion is removed, using Kevlin's suggestion (http://article.gmane.org/gmane.comp.lib.boost.devel/18253) I've run the tests for Intel C++ 7.0 (strict mode), MSVC 7.0 (with and without wchar_t as intrinsic type), and MSVC 6.0, and it works. This is now fixed in the CVS. Thanks for the feedback. Regards, Terje

1 0

Bug in regex library?
by Andrey Sverdlichenko 30 Mar '03

30 Mar '03

boost::regex do not compile with STLPort-4.5.3 on FreeBSD 4.7-RELEASE-p3, gcc 2.95.4. This is a patch that fixed a problem. Is it just a typo in source? ==== //boost/libs/regex/src/cpp_regex_traits.cpp#1 - //boost/libs/regex/src/cpp_regex_traits.cpp ==== @@ -201,7 +201,7 @@ const std::messages<char>* pm = 0; #ifndef __IBMCPP__ - std::messages<char>::catalog cat = static_cast<std::messages<wchar_t>::catalog>(-1); + std::messages<char>::catalog cat = static_cast<std::messages<char>::catalog>(-1); #else std::messages<char>::catalog cat = reinterpret_cast<std::messages<wchar_t>::catalog>(-1); #endif

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RE: [Boost-Users] Problem with 1.30.0 lexical_cast
by Tom Matelich 28 Mar '03

28 Mar '03

Well, actually, looks like it lies elsewhere. I rolled back to 1.29.0 and its still broken :( > -----Original Message----- > From: Terje Slettebø [mailto:tslettebo@chello.no] > Sent: Wednesday, March 26, 2003 9:15 PM > To: Boost-Users(a)yahoogroups.com > Subject: Re: [Boost-Users] Problem with 1.30.0 lexical_cast > > > >From: "Tom Matelich" <tmatelich(a)zetec.com> > > > Compiler: gcc 3.2 and 3.2.2 > > > > I believe this is actually a bug in gcc, but I'm going to > post it hopes > that > > someone can help me. We have a handy little tool for > generating enums > with > > associated string conversion and stream > insertion/extraction functions. > > When we upgraded to boost 1.30.0, lexical_cast'ing one of > these enums to > > std::string started behaving incorrectly, rather than the > name, it is > giving > > me the integral value. It seems that the lexical_stream is > being used. > > Unfortunately, my test case is working fine. The complete test case > > (including definition of ZAcquisition::PPG) is appended at > the end. The > > code I am seeing failure with looks like: > > > > void foo(ZAcquisition::PPG::Type gt) > > { > > ... > > std::string str; > > str = boost::lexical_cast<std::string>(gt); > > std::cerr << "DEBUG, storing encode for PPG: " << str << > ", aka " << gt > > << std::endl; > > ... > > } > > > > This outputs (for example): > > DEBUG, storing encode for PPG: 0, aka ONE > > > > I tried boost::lexical_cast<std::string, > ZAcquisition::PPG::Type>(gt) as > > well. > > > > Anyone have any ideas? For now I'm going to back out to 1.29.0's > > lexical_cast. > > > It happens on my Windows/Intel 7.0 box as well. > > It's a little difficult when you don't have a failing test > case. If you had > that, I could have looked into it. The above code works > correctly on Intel > C++ 7.0 (Windows), here. > > > Regards, > > Terje > > > ------------------------ Yahoo! Groups Sponsor > ---------------------~--> > Get 128 Bit SSL Encryption! > http://us.click.yahoo.com/xaxhjB/hdqFAA/xGHJAA/EbFolB/TM > -------------------------------------------------------------- > -------~-> > > Info: <http://www.boost.org> > Wiki: <http://www.crystalclearsoftware.com/cgi-bin/boost_wiki/wiki.pl> > Unsubscribe: <mailto:boost-users-unsubscribe@yahoogroups.com> > > > Your use of Yahoo! Groups is subject to > http://docs.yahoo.com/info/terms/ > > ----------------------------------------------------------------------- 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

Why "explicit" in shared_ptr's constructor?
by Maurizio Colucci 28 Mar '03

28 Mar '03

Hello, I am a newbie user of boost. I have a question about boost::shared_ptr. Suppose you have a polimorphic list: class entity{ ...}; class simple_entity : public entity{ public: uint id; simple_entity(uint i) : id(i) {} }; int main(){ list<shared_ptr<entity> > l; ... I noticed the following code doesn't compile l.push_back(new simple_entity(1)); too bad, because it was very easy to read, and very similar to the behavior if standard pointers (not to speak about similarity to Java and C#). So I am forced to do l.push_back(shared_ptr<entity> (new simple_entity(1))); which is less readable and, IMHO, barely tolerable on the long run: too much typing. It seems that the reason is the explicit keyword in the constructor. My question is: why? what was the danger without the explicit? Thank you very much for any info, Maurizio

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RE: [Boost-Users] Why "explicit" in shared_ptr's constructor?
by Tom Matelich 28 Mar '03

28 Mar '03

the danger comes from code like so: void foo(boost::shared_ptr<entity> p) { ... } void bar() { entity* e = new entity; foo(e); delete e; } Allowing a pointer to be converted to a shared_ptr implicitly could cause serious bugs. You could shorten things with this (untested) function: template <typename T> boost::shared_ptr<T> make_sp(T* p) { return boost::shared_ptr<T>(p); } > -----Original Message----- > From: Maurizio Colucci [mailto:seguso@email.it] > Sent: Friday, March 28, 2003 8:36 AM > To: Boost-Users(a)yahoogroups.com > Subject: [Boost-Users] Why "explicit" in shared_ptr's constructor? > > > Hello, > > I am a newbie user of boost. > > I have a question about boost::shared_ptr. Suppose you have a > polimorphic list: > > class entity{ ...}; > > > class simple_entity : public entity{ > public: > uint id; > simple_entity(uint i) : id(i) {} > }; > > int main(){ > list<shared_ptr<entity> > l; > ... > > > I noticed the following code doesn't compile > > l.push_back(new simple_entity(1)); > > too bad, because it was very easy to read, and very similar to the > behavior if standard pointers (not to speak about similarity to Java > and C#). So I am forced to do > > l.push_back(shared_ptr<entity> (new simple_entity(1))); > > which is less readable and, IMHO, barely tolerable on the long > run: too much typing. > > It seems that the reason is the explicit keyword in the > constructor. My question is: why? what was the danger without the > explicit? > > Thank you very much for any info, > > Maurizio > > > > > ------------------------ Yahoo! Groups Sponsor > ---------------------~--> > Get 128 Bit SSL Encryption! > http://us.click.yahoo.com/xaxhjB/hdqFAA/xGHJAA/EbFolB/TM > -------------------------------------------------------------- > -------~-> > > Info: <http://www.boost.org> > Wiki: <http://www.crystalclearsoftware.com/cgi-bin/boost_wiki/wiki.pl> > Unsubscribe: <mailto:boost-users-unsubscribe@yahoogroups.com> > > > Your use of Yahoo! Groups is subject to > http://docs.yahoo.com/info/terms/ > > ----------------------------------------------------------------------- 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. -----------------------------------------------------------------------

2 1

Boost.Thread 1.30 cause lot's of warnings and errors under vc 7.1
by Black Ice 28 Mar '03

28 Mar '03

void foo(string & str) { str = "foo"; } int main(int argc, char * argv[]) { string str1("Hello world"); string str2(str1); thread trd1(bind(&foo, str1)); thread trd2(bind(&foo, str2)); trd1.join(); trd2.join(); return 0; } The following is the compile log: Compiling... testThread.cpp d:\Programming\boost\boost\boost\thread\exceptions.hpp(29) : warning C4275: non dll-interface class 'std::logic_error' used as base for dll-interface class 'boost::lock_error' c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include\stdexcept(14) : see declaration of 'std::logic_error' d:\Programming\boost\boost\boost\thread\exceptions.hpp(28) : see declaration of 'boost::lock_error' d:\Programming\boost\boost\boost\thread\exceptions.hpp(35) : warning C4275: non dll-interface class 'std::runtime_error' used as base for dll-interface class 'boost::thread_resource_error' c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include\stdexcept(136) : see declaration of 'std::runtime_error' d:\Programming\boost\boost\boost\thread\exceptions.hpp(34) : see declaration of 'boost::thread_resource_error' d:\Programming\boost\boost\boost\thread\mutex.hpp(37) : warning C4275: non dll-interface class 'boost::noncopyable' used as base for dll-interface class 'boost::mutex' d:\Programming\boost\boost\boost\noncopyable.hpp(22) : see declaration of 'boost::noncopyable' d:\Programming\boost\boost\boost\thread\mutex.hpp(36) : see declaration of 'boost::mutex' d:\Programming\boost\boost\boost\thread\mutex.hpp(75) : warning C4275: non dll-interface class 'boost::noncopyable' used as base for dll-interface class 'boost::try_mutex' d:\Programming\boost\boost\boost\noncopyable.hpp(22) : see declaration of 'boost::noncopyable' d:\Programming\boost\boost\boost\thread\mutex.hpp(74) : see declaration of 'boost::try_mutex' d:\Programming\boost\boost\boost\thread\mutex.hpp(115) : warning C4275: non dll-interface class 'boost::noncopyable' used as base for dll-interface class 'boost::timed_mutex' d:\Programming\boost\boost\boost\noncopyable.hpp(22) : see declaration of 'boost::noncopyable' d:\Programming\boost\boost\boost\thread\mutex.hpp(114) : see declaration of 'boost::timed_mutex' d:\Programming\boost\boost\boost\thread\thread.hpp(39) : warning C4275: non dll-interface class 'boost::noncopyable' used as base for dll-interface class 'boost::thread' d:\Programming\boost\boost\boost\noncopyable.hpp(22) : see declaration of 'boost::noncopyable' d:\Programming\boost\boost\boost\thread\thread.hpp(38) : see declaration of 'boost::thread' d:\Programming\boost\boost\boost\thread\thread.hpp(68) : warning C4275: non dll-interface class 'boost::noncopyable' used as base for dll-interface class 'boost::thread_group' d:\Programming\boost\boost\boost\noncopyable.hpp(22) : see declaration of 'boost::noncopyable' d:\Programming\boost\boost\boost\thread\thread.hpp(67) : see declaration of 'boost::thread_group' d:\Programming\boost\boost\boost\thread\thread.hpp(79) : warning C4251: 'boost::thread_group::m_threads' : class 'std::list<_Ty>' needs to have dll-interface to be used by clients of class 'boost::thread_group' with [ _Ty=boost::thread * ] d:\Programming\boost\boost\boost\bind.hpp(186) : error C2664: 'void (std::string &)' : cannot convert parameter 1 from 'const std::string' to 'std::string &' Conversion loses qualifiers d:\Programming\boost\boost\boost\bind\bind_template.hpp(21) : see reference to function template instantiation 'R boost::_bi::list1<A1>::operator ()<boost::_bi::bind_t<R,F,L>::result_type,void(__cdecl *)(std::string &),boost::_bi::list0>(boost::_bi::type<T>,F,A &) const' being compiled with [ R=boost::_bi::bind_t<void,void (__cdecl *)(std::string &),boost::_bi::list1<boost::_bi::list_av_1<std::string>::B1>>::result_type, A1=boost::_bi::list_av_1<std::string>::B1, F=void (__cdecl *)(std::string &), L=boost::_bi::list1<boost::_bi::list_av_1<std::string>::B1>, T=boost::_bi::bind_t<void,void (__cdecl *)(std::string &),boost::_bi::list1<boost::_bi::list_av_1<std::string>::B1>>::result_type, A=boost::_bi::list0 ] d:\Programming\boost\boost\boost\bind\bind_template.hpp(19) : while compiling class-template member function 'boost::_bi::bind_t<R,F,L>::result_type boost::_bi::bind_t<R,F,L>::operator ()(void)' with [ R=void, F=void (__cdecl *)(std::string &), L=boost::_bi::list1<boost::_bi::list_av_1<std::string>::B1> ] d:\Programming\project\testBoost\testThread\testThread.cpp(36) : see reference to class template instantiation 'boost::_bi::bind_t<R,F,L>' being compiled with [ R=void, F=void (__cdecl *)(std::string &), L=boost::_bi::list1<boost::_bi::list_av_1<std::string>::B1> ] Build log was saved at "file://d:\Programming\project\testBoost\testThread\Debug\BuildLog.htm" testThread - 1 error(s), 8 warning(s) Any suggestions are appreciated.

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[uBLAS] operations thoughts
by vladimir josef sykora 28 Mar '03

28 Mar '03

Hello, Had a quick look into uBLAS library, and noted the incompatibility between std::vector<> and ublas' binary operations. For example, I have an ublas::matrix<> and wanted to multiply it by a std::vector<>. Since _all_ of ublas data containers provide iterators, I'm wondering why the library doesn't provide algorithms that work on iterators? In this way data structures and operators will be decoupled. For example, to do the product between a matrix and a vector: ********* untested code ********* template <class MatrixRowIterator, class MatrixColIterator, class InputIterator, class OutputIterator> OutputIterator prod(MatrixRowIterator first_row, MatrixRowIterator last_row, MatrixColIterator, InputIterator first_vec, OutputIterator result) { InputIterator cp_first=first_vec; while(first_row!=last_row) { typename MatrixRowIterator::value_type val(0); MatrixColIterator first_col, last_col; first_col=first_row.begin(); last_col=first_row.end(); while(first_col!=last_col) val+= *first_col++ * *first_vec++; *result++ = val; ++first_row; first_vec=cp_first; } return result; } // user side : prod(umatrix.begin1(), umatrix.end1(), umatrix.begin2(), std_vector.begin(), std::back_inserter(std_vector_result)); This of course with the respective preconditions. Also, wouldn't be a good idea to provide copy c'tor and operators accepting std::vector<> for the ublas::vector<> ? Regards, -- vladimir josef sykora morphochem AG gmunder str. 37-37a 81379 muenchen tel. ++49-89-78005-0 fax ++49-89-78005-555 vladimir.sykora(a)morphochem.de http://www.morphochem.de

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BGL properties question
by Jeff Holle 28 Mar '03

28 Mar '03

I would like to write a "generic" routine that prints the named vertex and edges properties. I can see in this code sibit (from graphviz.cpp) that the info that I want is present: > vertex_label(const Vertex& u, const GraphvizDigraph& g) { > boost::property_map<GraphvizDigraph, > boost::vertex_attribute_t>::const_type > va = boost::get(boost::vertex_attribute, g); > return (*(va[u].find("label"))).second; > } It appears that va is a map<Vertex, map<string, "property value"> > How would I write code that prints the names of the properites of a given vertex? (It would involve iterating over the map whose find method is used in the above code segment).

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BGL 1.30.0 upgrade problem
by Jeff Holle 28 Mar '03

28 Mar '03

Having switched from boost_1_29_0 to boost_1_30_0, code that was compiling and running now produces this error message: I'm using Mandrake linux 9.0 with the gcc v3.22 compiler. /home/jholle/boost_1_30_0/boost/graph/connected_components.hpp: In function `boost::property_traits<IndexMap>::value_type boost::connected_components(const Graph&, ComponentMap) [with Graph = boost::subgraph<boost::adjacency_list<boost::vecS, boost::vecS, boost::directedS, boost::GraphvizVertexProperty, boost::GraphvizEdgeProperty, boost::GraphvizGraphProperty, boost::listS> >, ComponentMap = boost::iterator_property_map<__gnu_cxx::__normal_iterator<size_t*, std::vector<size_t, std::allocator<size_t> > >, boost::subgraph_property_map<boost::subgraph<boost::adjacency_list<boost::vecS, boost::vecS, boost::directedS, boost::GraphvizVertexProperty, boost::GraphvizEdgeProperty, boost::GraphvizGraphProperty, boost::listS> >*, boost::vec_adj_list_vertex_id_map<boost::GraphvizVertexProperty, size_t> >, unsigned int, unsigned int&>]': BGLLayout.cpp:49: instantiated from here /home/jholle/boost_1_30_0/boost/graph/connected_components.hpp:99: `sizeof' applied to incomplete type `boost::STATIC_ASSERTION_FAILURE<false>' The code that produced this error is: void BGLLayout::FindComponents(void) { typedef vector<unsigned int> Ints; Ints c(num_vertices(m_graph)); connected_components(m_graph, make_iterator_property_map(c.begin(), get(vertex_index, m_graph), c[0])); << -- line 49 (error source) m_componentStartVertex.clear(); unsigned int i=0; for (Ints::const_iterator iter=c.begin(); iter != c.end(); ++iter,++i) if (m_componentStartVertex.size() <= *iter) m_componentStartVertex.push_back(i); } Note this code is largely taken from connected_components.cpp. Can anybody tell me what is wrong here?

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'boost::detail' problem
by Alejandro Escalante Medina 27 Mar '03

27 Mar '03

I do also a problem with some code that used to work in 1.29. The following is the output of VC7: d:\development\boost\libs\test\src\unit_test_main.cpp(63) : error C2872: 'detail' : ambiguous symbol could be 'boost::unit_test_framework::detail' or 'boost::detail' I saw someone reported something similar, but I couln't figure out what's wrong... Any ideas? Alex _________________________________________________________ Do You Yahoo!? La mejor conexión a internet y 25MB extra a tu correo por $100 al mes. http://net.yahoo.com.mx

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Re: bjam issue related to boost::python
by Ben Hutchings 27 Mar '03

27 Mar '03

In article <23681.5566233874$1028263753(a)news.gmane.org>, Srivatsan Raghavan wrote: > hi all , > i created a c++ extension module using python which worked fine.. > > then i wanted to embed a call to PyRun_SimpleFile in another app, > and the script i was calling is attempting to use my extension module > > but i was getting telling me that the interpreter wasn't initialized > after much searching, research, and work with msvc's Dependency Walker > i narrowed it down to the fact that boost_python_debug.dll is trying to > link to the release version of python22.dll , whereas it should be > linking to python22_d.dll (which unfortunately does not come with the > python installer , that has to be compiled manually ) > > at any rate, how can the boost::python Jamfile be modified to try this > check when it comes boost::python ? This is correct. The 'debug' configuration is meant to work with a release version of Python, though I don't know why. However, there is no need to modify the Jamfile; just use the 'debug-python' configuration instead. Also, make sure you include <pyconfig.h> before any of the Boost.Python headers, because not all of them do that and you can end up with incorrect structure definitions in a debug build if you don't. (I should report this bug.)

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