May 2008 - Boost-users - lists.boost.org

[filesystem] win32: fs::system_error_type undefined
by Andre Krause 02 May '08

02 May '08

hello list, i have upgraded to boost 1.35.0. running under win32 using visual studio 2008, i get: lib/boost/libs/filesystem/src/exception.cpp(39) : error C2039: 'system_error_type' : is not a member of 'boost::filesystem' what should i do? get the latest from subversion ? or downgrade to 34.1 ? everything else works fine. by the way, i include #include "../../lib/boost/libs/filesystem/src/operations.cpp" #include "../../lib/boost/libs/filesystem/src/exception.cpp" #include "../../lib/boost/libs/filesystem/src/path.cpp" #include "../../lib/boost/libs/filesystem/src/portability.cpp" #include "../../lib/boost/libs/system/src/error_code.cpp" #include "../../lib/boost/libs/iostreams/src/bzip2.cpp" manually. maybe this causes the problem? thanks in advance !

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install_name incorrect for dylibs on OS X 10.4
by Sancho McCann 02 May '08

02 May '08

Hi, This seems to be a problem for a few of the dynamic libraries. Running otool on libboost_filesystem, for example, gives: otool -L /opt/local/lib/libboost_filesystem-mt-1_35.dylib /opt/local/lib/libboost_filesystem-mt-1_35.dylib: /opt/local/lib/libboost_filesystem-mt-1_35.dylib (compatibility version 0.0.0, current version 0.0.0) libboost_system-mt-1_35.dylib (compatibility version 0.0.0, current version 0.0.0) /usr/lib/libstdc++.6.dylib (compatibility version 7.0.0, current version 7.4.0) /usr/lib/libgcc_s.1.dylib (compatibility version 1.0.0, current version 1.0.0) /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 88.3.3) The install_name of libboost_system-mt-1_35.dylib is missing the absolute path. How should this be addressed? Sancho

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Using gcc 4.2 mudflap with boost 1.34.1
by Robert Mecklenburg 02 May '08

02 May '08

First, please excuse the length of this message, I just want to provide a clear picture of what's happening. I'm interested in using the gcc mudflap feature (sort of valgrind/purify implemented in the compiler) with the boost libraries. http://gcc.gnu.org/wiki/Mudflap_Pointer_Debugging http://gcc-hk.internet.bs/summit/2003/mudflap.pdf Unfortunately, I'm running into serious problems. Preliminaries: I'm using gcc 4.2, boost 1.34.1, Ubuntu Linux Hardy Heron. I found a message from 2006-07-31 discussing mudflap (http://lists.boost.org/boost-build/2006/07/14546.php) but it only refers to build flags. Now for the issue, writing a simple test case (which appears to run correctly without mudflap instrumentation): #define BOOST_TEST_DYN_LINK #define BOOST_TEST_MAIN #include <boost/test/unit_test.hpp> BOOST_AUTO_TEST_CASE(mudflap) { } And compiling and running yields: $ g++ -g -fmudflapth -c -o mudflapTest.o mudflapTest.cpp $ g++ -g -fmudflapth mudflapTest.o /usr/lib/libmudflapth.so.0 \ -lboost_unit_test_framework -lboost_thread -o mudflapTest $ ./mudflapTest ******* mudflap violation 1 (check/write): time=1209744559.152187 ptr=0xbfa3594c size=4 pc=0xb7e047bd location=`/usr/include/boost/shared_ptr.hpp:149 (boost::shared_ptr<boost::unit_test::ut_detail::callback0_impl<boost::unit_test::ut_detail::unused> >::shared_ptr<boost::unit_test::ut_detail::callback0_impl_t<boost::unit_test::ut_detail::unused, void (*)()> >)' /usr/lib/libmudflap.so.0(__mf_check+0x3d) [0xb7e047bd] /home/mecklen/s5w/trunk/core/common/src/test/mudflapTest(_ZN5boost10shared_ptrINS_9unit_test9ut_detail14callback0_implINS2_6unusedEEEEC1INS2_16callback0_impl_tIS4_PFvvEEEEEPT_+0x77) [0x804ef79] /home/mecklen/s5w/trunk/core/common/src/test/mudflapTest(_ZN5boost9unit_test9callback0INS0_9ut_detail6unusedEEC1IPFvvEEET_+0x33) [0x804efe7] number of nearby objects: 0 ******* <10 more violations occur here> *** No errors detected Obviously, mudflap believes that there were invalid writes occurring in the boost libraries. I attempted to debug this by first expanding the cpp macros and removing the use of unnamed temporaries to yield: ... boost::unit_test::const_string name("mudflap"); boost::unit_test::test_case * tc = boost::unit_test::make_test_case(&mudflap_invoker, name); static boost::unit_test::ut_detail::auto_test_unit_registrar mudflap_registrar(tc, boost::unit_test::ut_detail::auto_tc_exp_fail<mudflap_id>::value); ... Running this under gdb I discover that the alleged violation appears to occur in the execution of the make_test_case(invoker, name) call, during the construction of a shared_ptr: (gdb) where #0 shared_ptr<boost::unit_test::ut_detail::callback0_impl_t<boost::unit_test::ut_detail::unused, void (*)()> > (this=0xbfecbddc, p=0x80d4d28) at /usr/include/boost/shared_ptr.hpp:149 #1 0x0804ed9d in callback0<void (*)()> (this=0xbfecbddc, f=0x804bf6c <mudflap_invoker>) at /usr/include/boost/test/utils/callback.hpp:111 #2 0x0804c5cd in __static_initialization_and_destruction_0 (__initialize_p=1, __priority=65535) at mudflapTest.cpp:26 #3 0x0804c65a in global constructors keyed to _ZN5boost9unit_test44_GLOBAL__N_mudflapTest.cpp_00000000_456E4E3F13unit_test_logE () at mudflapTest.cpp:36 #4 0x0804f4f5 in __do_global_ctors_aux () #5 0x0804bcb4 in _init () #6 0x0804f499 in __libc_csu_init () #7 0xb7b853f1 in __libc_start_main () from /lib/tls/i686/cmov/libc.so.6 #8 0x0804bed1 in _start () ******* mudflap violation 1 (check/write): time=1209743602.806628 ptr=0xbfecbddc size=4 ... The target of the shared pointer appears normal: (gdb) p p $2 = (boost::unit_test::ut_detail::callback0_impl_t<boost::unit_test::ut_detail::unused,void (*)()> *) 0x80d4d28 (gdb) p *p $3 = (boost::unit_test::ut_detail::callback0_impl_t<boost::unit_test::ut_detail::unused,void (*)()>) { <boost::unit_test::ut_detail::callback0_impl<boost::unit_test::ut_detail::unused>> = { _vptr.callback0_impl = 0x8051970 }, members of boost::unit_test::ut_detail::callback0_impl_t<boost::unit_test::ut_detail::unused,void (*)()>: m_f = 0x804bf6c <mudflap_invoker> } The pointers within this object appear to point to valid addresses with proper data (supporting evidence omitted for brevity). (I have tried to run the unit test code without shared libraries, but my attempts at static linking have failed, so far.) In short, I cannot determine why mudflap thinks this is bogus. I believe mudflap is implemented correctly, as I've used it successfully on other non-boost test cases. Has anyone used mudflap successfully with boost? It seems a powerful tool if it could be made to work. Thanks in advance for any suggestions. -- Robert Mecklenburg

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boost::mpl::switch?
by Robert Dailey 02 May '08

02 May '08

Hey guys, I was wondering if there was some sort of MPL Switch concept in the boost library. Before I go any further on that topic, let me first explain what I'm trying to do. I'm currently using a library that has several functions as follows: void SetParamFloat( char* name, float value ); void SetParamInt( char* name, int value ); void SetParamString( char* name, char* value ); I'm creating a sort of facade around this library, and as a result I have a function that looks as follows: template< typename t_type > void SetParam( char* name, t_type value ); What I need to do is map real types to function pointers, obviously. But I want all of this to be done at compile time, since I have all of the information to do so. My first thought on a solution to this problem was boost::mpl::map, but then I thought to myself: How do I pass function pointers as template arguments? And on top of that, since all of the functions I'd be mapping to types all have different types anyway, creating a functor object for function pointers seems difficult as you would have to do a lot of messy template class specializations. We'd have to wrap the function pointers in functors of some sort because boost::mpl::map requires typed template arguments, instead of non-type template arguments. This is what brings me to a sort of switch concept. If there was such a concept in the boost library, it might be more likely to hide the boiler plate code required simply to get to the point to where I can start adding items to a boost::mpl::map. I realize there is no boost::switch concept (at least that google shows), but I was wondering if there was something like it. As a pseudo code example, I would want the logic of my new function to work as follows: template< typename t_type > void SetParam( char* name, t_type value ) { switch( t_type ) { case float: { SetParamFloat( name, value ); break; } case int: { SetParamInt( name, value ); break; } case char*: { SetParamString( name, value ); break; } } } Any help is greatly appreciated. I guess what I really need is some guidance on the matter. I strive for a generic way to implement this, but I don't want it to look messy, as most template code has the bad habit of turning out that way.

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[bbost graph] need help on adjacency_list< ListS, ...
by lippmann2＠gmx.de 01 May '08

01 May '08

To use the remove_edge() function I have to change my graph definition from typedef adjacency_list< vecS, vecS, ....> to adjacency_list< ListS, listS, ....> . now the add_edge (...) function gives me an error while compiling: 'boost::add_edge' : cannot convert parameter 1 from 'int' to 'void *' what does this mean ???? also using these typedefs: typedef graph_traits < TGraph >::vertex_descriptor Tvertex_descriptor; typedef graph_traits < TGraph >::edge_descriptor Tedge_descriptor; typedef graph_traits <TGraph>::vertex_iterator Tvertex_iter; typedef graph_traits <TGraph>::edge_iterator Tedge_iter; seems to be no good idea, because I get many compiler errors now? Any help is welcome. -- Psst! Geheimtipp: Online Games kostenlos spielen bei den GMX Free Games! http://games.entertainment.gmx.net/de/entertainment/games/free

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Filesystem doc bug
by John Reynolds 01 May '08

01 May '08

I just did an upgrade from 1.33.1 to 1.35.0 and got bit by the BOOST_ALL_DYN_LINK et al macros. Anyways at http://www.boost.org/doc/libs/1_35_0/libs/filesystem/doc/index.htm#Build ing there is a reference to http://www.boost.org/more/separate_compilation.html explaining the macros, which does not exist. Any idea where this link should be as I am would be curious to read up on these macros. John Reynolds Aircraft Management Technologies Limited Registered in Ireland, No.337561 Registered office: 1 The Green, Malahide, Co.Dublin, Ireland Tel: + 353 1 8061000 Fax:+ 353 1 8061025 John.Reynolds(a)airmantech.com / John.Reynolds(a)flightman.com www.airmantech.com / www.flightman.com THE INFORMATION IN THIS E-MAIL IS CONFIDENTIAL AND MAY BE LEGALLY PRIVILEGED. IT IS INTENDED SOLELY FOR THE ADDRESSEE. ACCESS TO THIS E-MAIL BY ANYONE ELSE IS UNAUTHORISED. IF YOU ARE NOT THE INTENDED RECIPIENT, ANY DISCLOSURE, COPYRIGHT, DISTRIBUTION OR ANY ACTION TAKEN OR OMITTED TO BE TAKEN IN RELIANCE ON IT, IS PROHIBITED AND MAY BE UNLAWFUL.

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Re: [Boost-users] boost::result_of error?
by Hicham Mouline 01 May '08

01 May '08

I see. Perfectly clear now.I had obviously forgotten about scope resolution for types. Best Regards,ps: one unrelated question to follow in a separate post :-) ----- Original Message ----- From: "Ovanes Markarian" To: boost-users(a)lists.boost.org Subject: Re: [Boost-users] boost::result_of error? Date: Thu, 1 May 2008 19:45:45 +0200 Please read below. Just got an angry email from some pedantic Mailing-List guard. On Thu, May 1, 2008 at 6:07 PM, Hicham Mouline <hicham(a)mouline.org> wrote: Thanks for your clarifications, In your example, if "MyFunc" was typedef'd before its use in the template argument as say typedef int (*MyFunc)(int); it would not conflict with its use in the template argument ? First of all. I am sorry for an error I made when stated: template<T MyFunc()> struct X { typedef T result_type; typedef MyFunc function_type; }; This is not a valid C++ code, since MyFunc as the template parameter is a real pointer to a function, it is not a type. And you cannot make a typedef for a pointer. Only for it's type. To visualize the usage I have written a small program: #include <iostream> #include <typeinfo> typedef int (*MyFunc)(int, int); int get_int(int x) { return x; } int plus(int x, int y) { return x+y; } template<int (*MyFunc)(int)> struct X { typedef int result_type; result_type exec()const { ::MyFunc f2 = + //use scope resolution to access the global MyFunc return MyFunc(10)+f2(10,10); } }; int main(int argc, char* argv[]) { X<&get_int> x; std::cout << "sum: " << x.exec() << "\n"; }

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Re: [Boost-users] boost::result_of error?
by Hicham Mouline 01 May '08

01 May '08

Thanks for your clarifications, In your example, if "MyFunc" was typedef'd before its use in the template argument as say typedef int (*MyFunc)(int); it would not conflict with its use in the template argument ? best regards, ----- Original Message ----- From: "Ovanes Markarian" To: boost-users(a)lists.boost.org Subject: Re: [Boost-users] boost::result_of error? Date: Thu, 1 May 2008 17:13:40 +0200 Hicham, it does not create a new new type it only declares a type. Consider the following example: template<int ()> struct X {}; This means your type X expects a function pointer type with return value int and no parameters. This can be used in a meta programming to make some type assumptions or inspection. This is how the result_of works. Think of result_of as of type X but a bit more complex and which can give an assumption about the function type passed. We can write: template<int ()> struct X { typedef int type; }; A more generic form would be if int would be any valid result type T, so that we could write smth like this: template<T ()> struct X { typedef T type; }; Actually this is not a legal C++ struct, since T was not declared as template parameter, but think of it as if it would. template<T MyFunc()> struct X { typedef T result_type; typedef MyFunc function_type; }; Here MyFunc is a name of the function pointer type, which allows us to reference this type from inside the template. Hope that helps. With Kinds regards, Ovanes On Thu, May 1, 2008 at 2:32 PM, Hicham Mouline <hicham(a)mouline.org> wrote: But "floatfct" was defined earlier as the type of a pointer to a function with only 1 arg float.just passing the template argument to result_of creates a new type?is the new type also called floatfct ? ----- Original Message ----- From: "Ovanes Markarian" To: boost-users(a)lists.boost.org Subject: Re: [Boost-users] boost::result_of error? Date: Thu, 1 May 2008 13:58:21 +0200 Hicham, as far as I understand your code you pass to result_of a new type: typedef typename boost::result_of<floatfct(float, float)>::type resultype; This type is a pointer to a function type, which has as return type a pointer to floatfct and as params float, float. That's why it compiles. Regards, Ovanes On Thu, May 1, 2008 at 1:25 PM, Hicham Mouline <hicham(a)mouline.org> wrote: Hello, trying out Pete Becker's "c++ std lib ext" exercises, ex1 p155 #include <iostream> #include <typeinfo> #include <boost/utility/result_of.hpp> typedef float (*floatfct)(float); int main(int argc, char* argv[]) { typedef typename boost::result_of<floatfct(float, float)>::type resultype; std::cout<< typeid(resultype).name() << std::endl; } should fail, because result_of is instantiated with a callable type with 2 float args, while it's been defined as taking 1 float arg only? with intel10.1-MSVC8-boost1.35, it links. rds, _______________________________________________ Boost-users mailing list Boost-users(a)lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users _______________________________________________ Boost-users mailing list Boost-users(a)lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users _______________________________________________ Boost-users mailing list Boost-users(a)lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users _______________________________________________ Boost-users mailing list Boost-users(a)lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

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Re: [Boost-users] undefined symbols
by peter_foelsche＠agilent.com 01 May '08

01 May '08

this problem came from trying to create a 64bit executable using 32bit libraries. It seems that bjam does not find the compiler via the path environment variable but somehow directly and thus by default found the 32bit compiler and created 32bit libraries ________________________________ From: FOELSCHE,PETER (A-SantaClara,ex1) Sent: Wednesday, April 30, 2008 17:27 To: 'boost-users(a)lists.boost.org' Subject: undefined symbols ------ Build started: Project: boost_memory_mapped_io, Configuration: Release x64 ------ Linking... main.obj : error LNK2001: unresolved external symbol "class boost::filesystem::file_status __cdecl boost::filesystem::detail::status_api(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &,class boost::system::error_code &)" (?status_api@detail@filesystem@boost@@YA?AVfile_status@23@AEBV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@AEAVerror_code@system@3@@Z) main.obj : error LNK2001: unresolved external symbol "class boost::system::error_category const & __cdecl boost::system::get_system_category(void)" (?get_system_category@system@boost@@YAAEBVerror_category@12@XZ) main.obj : error LNK2001: unresolved external symbol "class boost::system::error_category const & __cdecl boost::system::get_posix_category(void)" (?get_posix_category@system@boost@@YAAEBVerror_category@12@XZ) main.obj : error LNK2001: unresolved external symbol "struct std::pair<class boost::system::error_code,unsigned __int64> __cdecl boost::filesystem::detail::file_size_api(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &)" (?file_size_api@detail@filesystem@boost@@YA?AU?$pair@Verror_code@system@boost@@_K@std@@AEBV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@5@@Z) C:\DocumentsAndSettings\pfoelsch\MyDocuments\boost_memory_mapped_io\x64\Release\boost_memory_mapped_io.exe : fatal error LNK1120: 4 unresolved externals Build log was saved at "file://c:\DocumentsAndSettings\pfoelsch\MyDocuments\boost_memory_mapped_io\boost_memory_mapped_io\x64\Release\BuildLog.htm" boost_memory_mapped_io - 5 error(s), 0 warning(s) ========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ========== see attached main.cpp I link with boost_system-vc80-mt-1_35.lib boost_filesystem-vc80-mt-1_35.lib and other boost libraries which are referenced directly. I work on 64bit XP compiling for 64bit.

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BOOST & STLport
by David Sowinski 01 May '08

01 May '08

What needs to be done to get BOOST (1.34.1) and STLport (5.1.5) to correctly coexist with each other under Windows and Visual Studio 2005? I have scoured the web and tried a ton of different configurations, none of which have worked. The problems that I am seeing appear to be related to STLport's IOStreams vs Microsoft's IOStreams. Any pointers to successful solutions would be greatly appreciated. _______________________________________________________ The information in this email or in any file attached hereto is intended only for the personal and confiden- tial use of the individual or entity to which it is addressed and may contain information that is propri- etary and confidential. If you are not the intended recipient of this message you are hereby notified that any review, dissemination, distribution or copying of this message is strictly prohibited. This communica- tion is for information purposes only and should not be regarded as an offer to sell or as a solicitation of an offer to buy any financial product. Email trans- mission cannot be guaranteed to be secure or error- free. P6070214

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