- Boost-users - lists.boost.org

filesystem::equivalent does not work for UNC paths on Windows
by Daniel Krügler 11 Nov '05

11 Nov '05

Hello! Its seems as if the Windows implementation of filesystem::equivalent can't handle UNC paths. While Windows is usually quite tolerant concerning the path separator / versus \, CreateFile* seems not to understand an UNC path containing // instead of \\. My proposal to fix that is to replace the call of the string() member function by the native_file_string() member function. What do you think? Greetings from Bremen, Daniel

1 1

[filesystem] path::native_file_string() heap issue and
by Brendon Costa 11 Nov '05

11 Nov '05

Hi all, I have been using the boost filesystem library for a little while under NetBSD and all is fine however I have just been porting our application over to windows and have come across a problem with the boost filesystem library (Boost 1.33.0). I am compiling with MinGW (g++ 3.4.2) on a Windows XP system. When debugging our application in gdb i get a SIGTRAP with an Invalid Address specified to RtlFreeHeap. This is when using the path::native_file_string() method. I also have another problem where a SEGFAULT ocurrs when using the boost::filesystem::exists() method, however i think that may be linked to the native_file_string() error. I wrote a small test program as shown below to reproduce the error when using path::native_file_string() #include <iostream> #include <boost/filesystem/operations.hpp> int main() { std::string filename = "test.dat"; boost::filesystem::path boost_filename(filename); std::cout << "Filename: " << filename << std::endl; std::cout << "Boost string(): " << boost_filename.string() << std::endl; std::cout << "Boost native_file_string(): " << boost_filename.native_file_string() << std::endl; return 0; } This compiles fine, and it also will run fine outside of GDB. However if i run it inside GDB i get errors on the line that uses boost_native_file_string() that are shown below: Starting program: X:\msys\Utils_test/./a.exe Program received signal SIGTRAP, Trace/breakpoint trap. 0x7c901231 in _libkernel32_a_iname () (gdb) warning: HEAP[a.exe]: warning: Invalid Address specified to RtlFreeHeap( 003D0000, 003D5138 ) bt #0 0x7c901231 in _libkernel32_a_iname () #1 0x7c96c943 in _libkernel32_a_iname () #2 0x7c96cd80 in _libkernel32_a_iname () #3 0x7c96df66 in _libkernel32_a_iname () #4 0x7c94a5d0 in _libkernel32_a_iname () #5 0x7c9268ad in _libkernel32_a_iname () #6 0x77c2c2de in _libkernel32_a_iname () #7 0x00409855 in operator delete(void*) () at boost_test.cpp:59 #8 0x0042e2dc in std::string::_Rep::_M_destroy(std::allocator<char> const&) () at c:/Boost/include/boost-1_33/boost/filesystem/path.hpp:57 #9 0x00430d68 in std::string::~string() () at c:/Boost/include/boost-1_33/boost/filesystem/path.hpp:57 #10 0x004015d6 in main () at boost_test.cpp:12 (gdb) I also have a larger program where part of its code uses the boost filesystem library that looks like: static std::string GetUnusedFileName(const char* suggestion = "test_file") { int count = 0; std::string base = suggestion; std::string filename(base + ".dat"); while(boost::filesystem::exists(boost::filesystem::path(filename))) { std::ostringstream stream; stream << base << "_" << count << ".dat"; filename = stream.str(); count++; } return filename; } This will usually cause a seg fault when calling the filesystem::exists() method. I currently do not have a stack trace for that and was unable to reproduce one but i think the two errors may be linked. Am i using the system correctly? The code works fine in NetBSD so i assume so. Has this bug been identified in the past and possibly fixed for the 1_33_1_beta release? I started compiling that but there are a few changes i need to make to the build system to go to 1_33_1 that may be time consuming for a problem that may not yet have been addressed anyway. Thanks for any help in advance, Brendon Costa.

1 0

[BGL] Edge descriptors for parallel edges
by Slava 11 Nov '05

11 Nov '05

Say, i have the following structure for edge bundle properties struct EdgeProperty { int edge_type; } and i can add parallel edges, that is between vertices u and v cab be several edges with bundle property EdgeProperty with different edge_types. the first question how can i use edge(u,v,graph) function if it returns std::pair <edge_descriptor,bool>, only one descriptor? but i have several descriptors between two vertices. second, how to change the edge_type provided that i got edge_descriptor from edge(u,v,graph) Thanks.

2 1

[Review] The review of the Boost.Logging library starts November 7th
by Hartmut Kaiser 10 Nov '05

10 Nov '05

Hi all, today starts the review of the Boost.Logging library written by John Torjo. It will end on November 16th. --------------------------------------------------- About the library: As applications are becoming more and more complex, logging is more and more of a must, in nowadays software. The Boost Logging Library is a library that: * makes it very easy to declare/define logs * allows you very simple access to logs * allows you to easily use/manipulate log levels (like, dbg/err/info/etc.) * allows for log hierarchies, and for manipulating log hierarchies * is thread-safe To get you started, here's some basic usage: BOOST_LOGL(app,dbg) << "debugging: " << i << '-' << j << std::endl; BOOST_LOG(app) << "I just wanted to tell you something...."; BOOST_LOGL(app,err) << "this is an error!"; The latest version of the lib can be found here: http://torjo.com/code/logging.zip --------------------------------------------------- Please always state in your review, whether you think the library should be accepted as a Boost library! Additionally please consider giving feedback on the following general topics: - What is your evaluation of the design? - What is your evaluation of the implementation? - What is your evaluation of the documentation? - What is your evaluation of the potential usefulness of the library? - Did you try to use the library? With what compiler? Did you have any problems? - How much effort did you put into your evaluation? A glance? A quick reading? In-depth study? - Are you knowledgeable about the problem domain? Regards Hartmut Review Manager

1 0

Serialized as what?
by Merrill Cornish 10 Nov '05

10 Nov '05

What external file format does the Boost Serialization Library use? The introduction to the library states the requirement that serialization written by one machine must be readable by a different machine. And, elsewhere, it mentions that and XML intermediate file is on possibility; but I can't seem to find what the format being used is. Merrill

4 3

bidirectional file_descriptor
by Johannes Balle 10 Nov '05

10 Nov '05

Hello, I am currently trying to use the iostreams lib with standard BSD socket() file descriptors. If I understand correctly, I need a "bidirectional" stream buffer, so I tried overriding the mode like this: stream_buffer<file_descriptor, std::char_traits<file_descriptor::char_type>, std::allocator<file_descriptor::char_type>, boost::iostreams::bidirectional> But I cannot instantiate this because a static assertion fails. I assume this happens because the file_descriptor class is defined to be seekable (which a TCP socket is not), so what is the best way to do this? Thanks for your help ... Johannes Ballé Philips Applied Technologies Building SFJ 4.50 Glaslaan 2 5616 LW Eindhoven Tel: +31 40 2734194 E-mail: johannes.balle(a)philips.com

1 0

[program_options] how to use case_insensitive
by Lawry, Brian 10 Nov '05

10 Nov '05

I am using Boost 1.33.0 and MS Visual Studio .NET 2003 (13.10.3077) and having trouble developing a simple Win32 console application that accepts case-insensitive command-line options. -- output ---------------------------------- ..\>app -n 2 BOOST_PROGRAM_OPTIONS_VERSION=2 count set to 2 ..\>app -N 2 BOOST_PROGRAM_OPTIONS_VERSION=2 Exception caught: unknown option -N -------------------------------------------- -- code ------------------------------------ #include <boost/program_options.hpp> int _tmain(int argc, _TCHAR* argv[]) { using std::cout; using std::endl; namespace po = boost::program_options; namespace cls = boost::program_options::command_line_style; int count = 0; cout << "BOOST_PROGRAM_OPTIONS_VERSION=" << BOOST_PROGRAM_OPTIONS_VERSION << endl; try { po::options_description desc("Usage"); desc.add_options() ("help,h", "produce help message") ("count,n", po::value<int>(&count), "repeat count") ; po::variables_map vm; int cl_style = 0; cl_style |= cls::allow_short; cl_style |= cls::allow_dash_for_short; cl_style |= cls::short_allow_next; cl_style |= cls::case_insensitive; po::store(po::command_line_parser(argc, argv).options(desc).style(cl_style).run(), vm); po::notify(vm); if (vm.count("count")) cout << "count set to " << count << endl; else cout << "count not set" << endl; } catch( exception &e ) { cout << "Exception caught:\t" << e.what() << endl; } catch(...) { cout << "Unhandled exception caught!" << endl; } } -------------------------------------------- The line "cl_style |= cls::case_insensitive;" seems to have no effect. The other options in that section do seem to work as I can create other errors by omitting others. I tried for a minimal set of styles. Any ideas what I'm doing wrong? Thanks. Brian Lawry Mfg Software Engineer Compressor Controls Corp blawry<insert@here>cccglobal.com

3 2

Compilation problems on VC7 of code uses boost 1.31.0
by Miko Nahum 10 Nov '05

10 Nov '05

Hi I need your example in compilation errors on code uses boost under Windows VC7 and HP-UX 11.11 aCC 3.55 in 64 bit mode. We have the boost 1.31.0 successfully installed and used in our products, in SunOS using Forte 6.5.3 CC, HP 11.11 using aCC 3.33, Windows (W2k, XP) using VC6. While porting our code to 64 bit, we have upgraded the development env` to Forte 8.5.5 CC on Sun, aCC 3.55 on HP and VC7 on Windows. Compilation of boost itself had no problem. However, compilation of our products that using it has been failed on HP and Windows. 1. Problems on Windows: We have the following piece of code that uses boost (copy/paste): #include "boost/regex.h" #include "boost/regex.hpp" using namespace boost; using namespace std; typedef boost::reg_expression<char> re_type; typedef re_type::allocator_type allocator_type; long example_func(long pos, const std::string& regE, long& reslen, long max) { long res; boost::match_results <PData::iterator, allocator_type> m; allocator_type (a); re_type e (a); e.set_expression (regE, regbase::normal); if (regex_search (begin (), end (), m, e, match_not_dot_newline | match_not_dot_null)) <-- line 4790 { res = pos + m.position(); reslen = m.length(); return res; } . . . Compiling the above produce the following error: parser.cpp z:\n2_3rd_party_components\boost\delivery\include\boost\regex\v4\perl_ma tcher_common.hpp(208) : error C2228: left of '.second' must have class/struct/union type type is 'const std::allocator<_Ty>::value_type' with [ _Ty=char ] z:\n2_3rd_party_components\boost\delivery\include\boost\regex\v4\basic_r egex.hpp(243) : while compiling class-template member function 'bool boost::re_detail::perl_matcher<BidiIterator,Allocator,traits,Allocator2> ::find_imp(void)' with [ BidiIterator=PData::iterator, Allocator=allocator_type, traits=boost::regex_traits<char>, Allocator2=std::allocator<char> ] c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include\xlocmon(190) : while compiling class-template member function 'boost::re_detail::perl_matcher<BidiIterator,Allocator,traits,Allocator2 >::perl_matcher(BidiIterator,BidiIterator,boost::match_results<BidiItera tor,Allocator> &,const boost::reg_expression<charT> &,boost::regex_constants::match_flag_type)' with [ BidiIterator=PData::iterator, Allocator=allocator_type, traits=boost::regex_traits<char>, Allocator2=std::allocator<char>, charT=char ] z:\n2_3rd_party_components\boost\delivery\include\boost\regex\v4\regex_s earch.hpp(38) : see reference to class template instantiation 'boost::re_detail::perl_matcher<BidiIterator,Allocator,traits,Allocator2 >' being compiled with [ BidiIterator=PData::iterator, Allocator=allocator_type, traits=boost::regex_traits<char>, Allocator2=std::allocator<char> ] z:\med2\dev\ParserLib\parser.cpp(4790) : see reference to function template instantiation 'bool boost::regex_search<PData::iterator,allocator_type,char,boost::regex_tra its<charT>,std::allocator<_Ty>>(BidiIterator,BidiIterator,boost::match_r esults<BidiIterator,Allocator> &,const boost::reg_expression<charT> &,boost::regex_constants::match_flag_type)' being compiled with [ charT=char, _Ty=char, BidiIterator=PData::iterator, Allocator=allocator_type ] "z:\med2\dev\ParserLib\parser.cpp(4790)" is marked above with red. "z:\n2_3rd_party_components\boost\delivery\include\boost\regex\v4\regex_ search.hpp(38)" is listed below: template <class BidiIterator, class Allocator, class charT, class traits, class Allocator2> bool regex_search(BidiIterator first, BidiIterator last, match_results<BidiIterator, Allocator>& m, const reg_expression<charT, traits, Allocator2>& e, match_flag_type flags = match_default) { if(e.flags() & regex_constants::failbit) return false; re_detail::perl_matcher<BidiIterator, Allocator, traits, Allocator2> matcher(first, last, m, e, flags); <-- line 38 return matcher.find(); } "z:\n2_3rd_party_components\boost\delivery\include\boost\regex\v4\perl_m atcher_common.hpp(208)" is part of the following function: template <class BidiIterator, class Allocator, class traits, class Allocator2> bool perl_matcher<BidiIterator, Allocator, traits, Allocator2>::find_imp() and the line (208) is listed below: // start again: search_base = position = m_result[0].second; <-- line 208 // If last match was null and match_not_null was not set then increment // our start position, otherwise we go into an infinite loop: Searching Google for this problem did not help very much, so I was wondering if you have encounter it and put more light on it and the solution? 2. Problems on HP: 2.1. Error 24: "/VOBS/netrac2_3rd_party/boost/delivery/include/boost/regex/v4/regbase.h pp", line 53 # '<identifier>' expected instead of 'collate'. perlex = collate << 1, // perl extensions ^^^^^^^ Error 164: "/VOBS/netrac2_3rd_party/boost/delivery/include/boost/regex/v4/regbase.h pp", line 53 # Integral type expected for operator '<<'; types found were '<no type>' and 'int'. perlex = collate << 1, // perl extensions ^^^^ We do not understand why the error occurs, can you help with that? from some reason, HP's aCC doesn't like the "collate". Again, same as with problem #1, google it did not produce any useful information. We have workaround this problem as follow: changed: collate = icase << 1, // use locale specific collation perlex = collate << 1, // perl extensions to: collate = icase << 1, // use locale specific collation _collate = icase << 1, perlex = _collate << 1, // perl extensions What do you think about this solution? 2.2. Fixing above problem have exposed a problem similar to the Windows problem. Btw, both problems #1 and #2.2 were solved when set #define BOOST_NO_STD_ALLOCATOR Regards, Miko Nahum

1 0

MSVC Afx Libs incompatibility ?
by joel 10 Nov '05

10 Nov '05

I have just "demo_xml" serialisation test with "StdAfx.h" precompilated header. VC7.1 reply : nafxcwd.lib(afxmem.obj) : error LNK2005: "void * __cdecl operator new(unsigned int)" (??2@YAPAXI@Z) déjà défini(e) dans libcpmtd.lib(newop.obj) It seems that boost libs is defining new operator as nafxcwd.lib from microsoft. Does anyone succeed to use boost libs with "stdafx" libs ? Joel.

4 3

Re: [Boost-users] boost::python and Python 2.4
by Nat Goodspeed 09 Nov '05

09 Nov '05

> -----Original Message----- > From: boost-users-bounces(a)lists.boost.org [mailto:boost-users- > bounces(a)lists.boost.org] On Behalf Of Noel Yap > Sent: Monday, November 07, 2005 6:34 PM > To: boost-users(a)lists.boost.org > Subject: Re: [Boost-users] boost::python and Python 2.4 > > What did you have to do to get it to work with Python 2.4? Is all > that's necessary to modify all references to python2.2 to python2.4? [Nat] ? Not sure what references you mean. I just changed the environment variable we use for the Python base directory from c:\Python23 to c:\Python24, thus pointing to all new header files and libraries, and ta daa!

3 2