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Why does lexical_cast make a copy?
by Daniel T. 23 Mar '02

23 Mar '02

I noticed that the function declaration of lexical_cast is: template<typename Target, typename Source> Target lexical_cast(Source arg) Namely that arg is a copy of the original source. Is there a specific reason that a copy is made? Why isn't it a 'const Source&' instead? --

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Missing timestamp.c in jam_src
by rwhadsell 22 Mar '02

22 Mar '02

I just downloaded Boost 1.27.0 and tried to build jam for my Tru64 Unix system. The make failed, because there is no timestamp.c in the tools/build/jam_src directory.

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Problems building Boost 1.27.0 libraries
by Paul Dubuc 22 Mar '02

22 Mar '02

I have downloaded Boost and am trying to build the libraries on Solaris 8 with g++ 2.95.3: jam -sBOOST_ROOT=. -sTOOLS=gcc -sBUILD="debug release" The thread library has an error building once.cpp: gcc-C++-action libs/thread/build/bin/libboost_thread/gcc/release/runtime-link-dy namic/threading-multi/once.o g++: unrecognized option `-pthread' libs/thread/build/../src/once.cpp:42: warning: aggregate has a partly bracketed initializer libs/thread/build/../src/once.cpp:138: parse error at end of input g++ -c -Wall -ftemplate-depth-100 -DNDEBUG -O4 -finline-functions -Wno-in line -pthread -I"libs/thread/build" -I"." -o "libs/thread/build/bin/libboost _thread/gcc/release/runtime-link-dynamic/threading-multi/once.o" "libs/thread/b uild/../src/once.cpp" ...failed gcc-C++-action libs/thread/build/bin/libboost_thread/gcc/release/runti me-link-dynamic/threading-multi/once.o ... The Python library seems to have some missing files. Lots of errors of this type: -- In file included from boost/python/detail/base_object.hpp:16, from boost/python/detail/types.hpp:27, from boost/python/detail/call_object.hpp:9, from libs/python/build/../src/types.cpp:11: boost/python/detail/wrap_python.hpp:24: patchlevel.h: No such file or directory boost/python/detail/wrap_python.hpp:100: Python.h: No such file or directory The regex library builds fine, but I get the following errors when I use the gcc.mak makefile to build and run the regression test in libs/regex/test/regress: g++ -pedantic -Wall -I../../../../ -I./ -L../../build/gcc -O2 -o r2 tests.cpp parse.cpp regress.cpp -lboost_regex In file included from ../../../../boost/regex/config.hpp:51, from ../../../../boost/cregex.hpp:27, from ../../../../boost/regex.hpp:31, from tests.cpp:26: ../../../../boost/cstdint.hpp:202: too many `l's in integer constant ../../../../boost/cstdint.hpp:205: #error defaults not correct; you must hand mo dify boost/cstdint.hpp In file included from ../../../../boost/regex/config.hpp:51, from ../../../../boost/cregex.hpp:27, from ../../../../boost/regex.hpp:31, from parse.cpp:25: ../../../../boost/cstdint.hpp:202: too many `l's in integer constant ../../../../boost/cstdint.hpp:205: #error defaults not correct; you must hand mo dify boost/cstdint.hpp In file included from ../../../../boost/regex/config.hpp:51, from ../../../../boost/cregex.hpp:27, from ../../../../boost/regex.hpp:31, from regress.cpp:26: ../../../../boost/cstdint.hpp:202: too many `l's in integer constant ../../../../boost/cstdint.hpp:205: #error defaults not correct; you must hand mo dify boost/cstdint.hpp make: *** [r2] Error 1 I can work around this one by modifying gcc.mak to remove the -pedantic option. I would appreciate any help I can get with the other errors. Are the Python and Threads libraries not supported with my configuration? Thanks, -- Paul M. Dubuc

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RE: [Boost-Users] BFS-visitor with gcc3.0.1
by Wintermantel , Marc 22 Mar '02

22 Mar '02

Thank you very much... just worked perfect! Yours truly, Marc -----Original Message----- From: Jeremy Siek [mailto:jsiek@cs.indiana.edu] Sent: Thursday, March 21, 2002 10:53 PM To: Boost-Users(a)yahoogroups.com Subject: RE: [Boost-Users] BFS-visitor with gcc3.0.1 Sure. Here's the gist: typedef vector<...>::iterator vec_iter; typedef graph_traits<Graph>::vertices_size_type size_type; typedef property_map<Graph, vertex_index_t>::const_type VertexID; boost::iterator_property_map<vec_iter, VertexID, size_type, size_type&> dist_pmap(dist.begin(), get(vertex_index, g)); Also, in the BGL book there is an example of iterator property map on page 79-80. And the web pages have a slighly different example: http://www.boost.org/libs/property_map/iterator_property_map.html Cheers, Jeremy On Thu, 21 Mar 2002, Wintermantel , Marc wrote: marc.w> Hello Jeremy, marc.w> marc.w> marc.w> Thank you for your quick answer. Unfortunately I'm not so experienced marc.w> with these property maps. Could you give me a hint how to wrap this marc.w> iterator_property_map around my vector::iterator? marc.w> marc.w> marc.w> marc.w> Yours truly, marc.w> marc.w> marc.w> marc.w> Marc Wintermantel marc.w> marc.w> marc.w> marc.w> -----Original Message----- marc.w> From: Jeremy Siek [mailto:jsiek@cs.indiana.edu] marc.w> Sent: Wednesday, March 20, 2002 2:40 PM marc.w> To: Boost-Users(a)yahoogroups.com marc.w> Subject: Re: [Boost-Users] BFS-visitor with gcc3.0.1 marc.w> marc.w> marc.w> marc.w> Hi Marc, marc.w> marc.w> I think your problem is that BGL has get() and put() property map marc.w> functions defined for pointers, but vector::iterator is not guaranteed marc.w> to marc.w> be a pointer. marc.w> marc.w> The fix is to wrap vector::iterator using the iterator_property_map marc.w> class. marc.w> marc.w> Cheers, marc.w> Jeremy marc.w> marc.w> On Wed, 20 Mar 2002, Wintermantel , Marc wrote: marc.w> marc.w> marc.w> Hello, marc.w> marc.w> marc.w> marc.w> marc.w> marc.w> marc.w> marc.w> I tried to complile the following code that worked under gcc marc.w> 2.95.3 marc.w> marc.w> under gcc 3.0.1 and got tons of error messages: marc.w> marc.w> marc.w> marc.w> marc.w> marc.w> marc.w> marc.w> typedef adjacency_list< marc.w> marc.w> marc.w> marc.w> setS, marc.w> marc.w> marc.w> marc.w> vecS, marc.w> marc.w> marc.w> marc.w> undirectedS, marc.w> marc.w> marc.w> marc.w> property< marc.w> marc.w> marc.w> marc.w> vertex_color_t, marc.w> marc.w> marc.w> marc.w> default_color_type, marc.w> marc.w> marc.w> marc.w> property< marc.w> marc.w> marc.w> marc.w> vertex_degree_t, marc.w> marc.w> marc.w> marc.w> int, marc.w> marc.w> marc.w> marc.w> property< marc.w> marc.w> marc.w> marc.w> vertex_current_degree_t, marc.w> marc.w> marc.w> marc.w> int, marc.w> marc.w> marc.w> marc.w> property< marc.w> marc.w> marc.w> marc.w> vertex_priority_t, marc.w> marc.w> marc.w> marc.w> int > > > > > Graph; marc.w> marc.w> marc.w> marc.w> marc.w> marc.w> marc.w> marc.w> ... marc.w> marc.w> marc.w> marc.w> marc.w> marc.w> marc.w> marc.w> std::vector<graph_traits<Graph>::vertices_size_type> marc.w> marc.w> dist(num_vertices(G), 0); marc.w> marc.w> marc.w> marc.w> marc.w> marc.w> marc.w> marc.w> breadth_first_search marc.w> marc.w> marc.w> marc.w> (G, e, visitor marc.w> marc.w> marc.w> marc.w> ( marc.w> marc.w> marc.w> marc.w> make_bfs_visitor(record_distances(dist.begin(), marc.w> marc.w> on_tree_edge() ) ) marc.w> marc.w> marc.w> marc.w> ) marc.w> marc.w> marc.w> marc.w> ); marc.w> marc.w> marc.w> marc.w> marc.w> marc.w> marc.w> marc.w> ... marc.w> marc.w> marc.w> marc.w> marc.w> marc.w> marc.w> marc.w> The errors have something to deal with the visitors, more I marc.w> could not marc.w> marc.w> read out of the errors. When I use a simple array in the form marc.w> int d[n] marc.w> marc.w> it works. marc.w> marc.w> marc.w> marc.w> marc.w> marc.w> marc.w> marc.w> Yours truly, marc.w> marc.w> marc.w> marc.w> marc.w> marc.w> marc.w> marc.w> Marc Wintermantel marc.w> marc.w> marc.w> marc.w> marc.w> marc.w> marc.w> marc.w> marc.w> marc.w> marc.w> marc.w> Marc Wintermantel marc.w> marc.w> marc.w> marc.w> IMES - Structures Technology marc.w> marc.w> marc.w> marc.w> ETH Zurich, LEO C4 marc.w> marc.w> marc.w> marc.w> Leonhardstrasse 27 marc.w> marc.w> marc.w> marc.w> CH- 8092 Zurich marc.w> marc.w> marc.w> marc.w> Tel. ++41 1 633 35 32 marc.w> marc.w> marc.w> marc.w> Fax. ++41 1 632 17 02 marc.w> marc.w> marc.w> marc.w> marc.w> marc.w> marc.w> marc.w> marc.w> marc.w> marc.w> marc.w> [Non-text portions of this message have been removed] marc.w> marc.w> marc.w> marc.w> marc.w> marc.w> marc.w> marc.w> marc.w> marc.w> Info: <http://www.boost.org> marc.w> marc.w> Wiki: marc.w> <http://www.crystalclearsoftware.com/cgi-bin/boost_wiki/wiki.pl> marc.w> marc.w> Unsubscribe: <mailto:boost-users-unsubscribe@yahoogroups.com> marc.w> marc.w> marc.w> marc.w> marc.w> marc.w> Your use of Yahoo! Groups is subject to marc.w> http://docs.yahoo.com/info/terms/ marc.w> marc.w> marc.w> marc.w> marc.w> marc.w> ---------------------------------------------------------------------- marc.w> Jeremy Siek http://php.indiana.edu/~jsiek/ marc.w> Ph.D. Student, Indiana Univ. B'ton email: jsiek(a)osl.iu.edu marc.w> C++ Booster (http://www.boost.org) office phone: (812) 855-3608 marc.w> ---------------------------------------------------------------------- ---------------------------------------------------------------------- Jeremy Siek http://php.indiana.edu/~jsiek/ Ph.D. Student, Indiana Univ. B'ton email: jsiek(a)osl.iu.edu C++ Booster (http://www.boost.org) office phone: (812) 855-3608 ---------------------------------------------------------------------- Yahoo! Groups Sponsor ADVERTISEMENT <http://rd.yahoo.com/M=215002.1818248.3328688.1261774/D=egroupweb/S=1705 006788:HM/A=847665/R=0/*http:/ads.x10.com/?bHlhaG9vbW9uc3RlcjcuZGF0=1016 747598%3eM=215002.1818248.3328688.1261774/D=egroupweb/S=1705006788:HM/A= 847665/R=1> <http://us.adserver.yahoo.com/l?M=215002.1818248.3328688.1261774/D=egrou pmail/S=1705006788:HM/A=847665/rand=218683910> 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 the Yahoo! Terms of Service <http://docs.yahoo.com/info/terms/> . [Non-text portions of this message have been removed]

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RE: [Boost-Users] BFS-visitor with gcc3.0.1
by Wintermantel , Marc 21 Mar '02

21 Mar '02

Hello Jeremy, Thank you for your quick answer. Unfortunately I'm not so experienced with these property maps. Could you give me a hint how to wrap this iterator_property_map around my vector::iterator? Yours truly, Marc Wintermantel -----Original Message----- From: Jeremy Siek [mailto:jsiek@cs.indiana.edu] Sent: Wednesday, March 20, 2002 2:40 PM To: Boost-Users(a)yahoogroups.com Subject: Re: [Boost-Users] BFS-visitor with gcc3.0.1 Hi Marc, I think your problem is that BGL has get() and put() property map functions defined for pointers, but vector::iterator is not guaranteed to be a pointer. The fix is to wrap vector::iterator using the iterator_property_map class. Cheers, Jeremy On Wed, 20 Mar 2002, Wintermantel , Marc wrote: marc.w> Hello, marc.w> marc.w> marc.w> marc.w> I tried to complile the following code that worked under gcc 2.95.3 marc.w> under gcc 3.0.1 and got tons of error messages: marc.w> marc.w> marc.w> marc.w> typedef adjacency_list< marc.w> marc.w> setS, marc.w> marc.w> vecS, marc.w> marc.w> undirectedS, marc.w> marc.w> property< marc.w> marc.w> vertex_color_t, marc.w> marc.w> default_color_type, marc.w> marc.w> property< marc.w> marc.w> vertex_degree_t, marc.w> marc.w> int, marc.w> marc.w> property< marc.w> marc.w> vertex_current_degree_t, marc.w> marc.w> int, marc.w> marc.w> property< marc.w> marc.w> vertex_priority_t, marc.w> marc.w> int > > > > > Graph; marc.w> marc.w> marc.w> marc.w> ... marc.w> marc.w> marc.w> marc.w> std::vector<graph_traits<Graph>::vertices_size_type> marc.w> dist(num_vertices(G), 0); marc.w> marc.w> marc.w> marc.w> breadth_first_search marc.w> marc.w> (G, e, visitor marc.w> marc.w> ( marc.w> marc.w> make_bfs_visitor(record_distances(dist.begin(), marc.w> on_tree_edge() ) ) marc.w> marc.w> ) marc.w> marc.w> ); marc.w> marc.w> marc.w> marc.w> ... marc.w> marc.w> marc.w> marc.w> The errors have something to deal with the visitors, more I could not marc.w> read out of the errors. When I use a simple array in the form int d[n] marc.w> it works. marc.w> marc.w> marc.w> marc.w> Yours truly, marc.w> marc.w> marc.w> marc.w> Marc Wintermantel marc.w> marc.w> marc.w> marc.w> marc.w> marc.w> Marc Wintermantel marc.w> marc.w> IMES - Structures Technology marc.w> marc.w> ETH Zurich, LEO C4 marc.w> marc.w> Leonhardstrasse 27 marc.w> marc.w> CH- 8092 Zurich marc.w> marc.w> Tel. ++41 1 633 35 32 marc.w> marc.w> Fax. ++41 1 632 17 02 marc.w> marc.w> marc.w> marc.w> marc.w> marc.w> [Non-text portions of this message have been removed] marc.w> marc.w> marc.w> marc.w> marc.w> Info: <http://www.boost.org> marc.w> Wiki: <http://www.crystalclearsoftware.com/cgi-bin/boost_wiki/wiki.pl> marc.w> Unsubscribe: <mailto:boost-users-unsubscribe@yahoogroups.com> marc.w> marc.w> marc.w> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/ marc.w> marc.w> ---------------------------------------------------------------------- Jeremy Siek http://php.indiana.edu/~jsiek/ Ph.D. Student, Indiana Univ. B'ton email: jsiek(a)osl.iu.edu C++ Booster (http://www.boost.org) office phone: (812) 855-3608 ---------------------------------------------------------------------- Yahoo! Groups Sponsor ADVERTISEMENT <http://rd.yahoo.com/M=215002.1818248.3328688.1261774/D=egroupweb/S=1705 006788:HM/A=847665/R=0/*http:/ads.x10.com/?bHlhaG9vbW9uc3RlcjcuZGF0=1016 631646%3eM=215002.1818248.3328688.1261774/D=egroupweb/S=1705006788:HM/A= 847665/R=1> <http://us.adserver.yahoo.com/l?M=215002.1818248.3328688.1261774/D=egrou pmail/S=1705006788:HM/A=847665/rand=597375913> 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 the Yahoo! Terms of Service <http://docs.yahoo.com/info/terms/> . [Non-text portions of this message have been removed]

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Threads on Carbon
by Emil Edeholt 21 Mar '02

21 Mar '02

Hi, I downloaded the boost threads, and I can't get it to work on Mac OS Classic 9.1. Does the threads only work in Mac OS X or should it work here in Mac OS Classic (with Carbon)? Best Regards -- Emil Edeholt

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A error in regex_grep_example_3.cpp
by rogerleee 21 Mar '02

21 Mar '02

Hi, there: regex_grep_example_3.cpp is the example source file in the boost/regex library. I find a bug at line 92 : boost::regex_grep(std::bind1st(std::mem_fun (&class_index::grep_callback), this), start, end, expression); where "mem_fun" should be "mem_fun1". ps:I use MSVC6.0 on Micro$oft win2k. Roger

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Task groups using boost::thread
by gunnarnl 20 Mar '02

20 Mar '02

After overcoming my initial problems with compiling I have another question. I like very much the thread_group concept. My idea is to create different groups running different type of tasks. E.g. one group deals with user request tasks and another deal with responses from a mainframe etc. In addition, I think it would be good to be able to maximize the number of threads running concurrently in a single group. In this way one could tune the processes regarding to the number of CPUs and so that not one single group gets more CPU usage than others etc. I guess I'm not the first one to think about these things. Does anyone have any ideas about these type of task groups? Although it doesn't nearly contain what I want to do, I got the following test work nicely. #include <boost/thread/thread.hpp> #include <boost/thread/xtime.hpp> #include <iostream> #include <windows.h> template<class T> class thread_task { public: thread_task(T* obj) : m_obj(obj) { assert(m_obj != 0); } virtual ~thread_task() { } void operator() () { m_obj->setup(); m_obj->run(); m_obj->cleanup(); delete m_obj; } private: T* m_obj; }; class my_task { public: my_task() {} void setup() { std::cout << "setup " << GetCurrentThreadId() << std::endl; } void run() { std::cout << "Start sleeping in thread " << GetCurrentThreadId() << std::endl; boost::xtime xt; boost::xtime_get(&xt, boost::TIME_UTC); xt.sec += 1; boost::thread::sleep(xt); std::cout << "Woke up " << GetCurrentThreadId() << std::endl; } void cleanup() { std::cout << "cleanup " << GetCurrentThreadId() << std::endl; } }; int main(int argc, char* argv[]) { boost::thread_group threads; int i; for (i = 0; i < 10; ++i) { my_task* aTask = new my_task(); thread_task<my_task> new_task(aTask); threads.create_thread(new_task); } threads.join_all(); return 0; } By the way, is there an operation in boost::thread to get the current thread id?

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Problem linking boost::threads using MSVC6 SP4
by gunnarnl 20 Mar '02

20 Mar '02

I've created a windows console project with VC++ 6.0 and just used one of the examples in the documentation. I've also added the BOOST_HAS_THREADS macro in the settings. The program compiles well in debug mode but gives the following linking errors: Compiling... main.cpp Linking... msvcprtd.lib(MSVCP60D.dll) : error LNK2005: "public: virtual __thiscall std::runtime_error::~runtime_error(void)" (?? 1runtime_error@std@@UAE@XZ) already defined in main.obj msvcprtd.lib(MSVCP60D.dll) : error LNK2005: "public: __thiscall std::runtime_error::runtime_error(class runtime_error::runtime_error const &)" (??0runtime_error@std@@QAE@ABV01@@Z) already defined in main.obj msvcprtd.lib(MSVCP60D.dll) : error LNK2005: "public: __thiscall std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >::~basic_string<char,struct std::char_traits<char>,class std::allocator<char> >(void)" (??1? $basic_strin g@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAE@XZ) already defined in main.obj msvcprtd.lib(MSVCP60D.dll) : error LNK2005: "public: __thiscall std::runtime_error::runtime_error(class runtime_error::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &)" (??0runtime_error@std@@QAE@ABV? $basic_strin g@DU?$char_traits@D@std@@V?$allocator@D@2@@1@@Z) already defined in libcpmtd.lib(ios.obj) msvcprtd.lib(MSVCP60D.dll) : error LNK2005: "public: __thiscall std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >(char const *,class basic_ string<char,struct std::char_traits<char>,class std::allocator<char> >::allocator<char> const &)" (??0?$basic_string@DU? $char_traits@D@std@@V?$allocator@D@2@@std@@QAE@PBDABV? $allocator@D@1@@Z) already defined in main.obj LINK : warning LNK4098: defaultlib "MSVCRTD" conflicts with use of other libs; use /NODEFAULTLIB:library Debug/threads.exe : fatal error LNK1169: one or more multiply defined symbols found Error executing link.exe. Any help on this would be appreciated. Gunnar Olerud

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BFS-visitor with gcc3.0.1
by Wintermantel , Marc 20 Mar '02

20 Mar '02

Hello, I tried to complile the following code that worked under gcc 2.95.3 under gcc 3.0.1 and got tons of error messages: typedef adjacency_list< setS, vecS, undirectedS, property< vertex_color_t, default_color_type, property< vertex_degree_t, int, property< vertex_current_degree_t, int, property< vertex_priority_t, int > > > > > Graph; ... std::vector<graph_traits<Graph>::vertices_size_type> dist(num_vertices(G), 0); breadth_first_search (G, e, visitor ( make_bfs_visitor(record_distances(dist.begin(), on_tree_edge() ) ) ) ); ... The errors have something to deal with the visitors, more I could not read out of the errors. When I use a simple array in the form int d[n] it works. Yours truly, Marc Wintermantel Marc Wintermantel IMES - Structures Technology ETH Zurich, LEO C4 Leonhardstrasse 27 CH- 8092 Zurich Tel. ++41 1 633 35 32 Fax. ++41 1 632 17 02 [Non-text portions of this message have been removed]

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