- Boost-users - lists.boost.org

iostreams: stream vs stream_buffer
by Os 31 May '07

31 May '07

Hi, could someone elaborate on when I would use a stream and when I would use a stream_buffer (filtered or otherwise)? They look remarkably similar to me. cheers, os. -- os(a)collective.co.uk http://www.collective.co.uk/ http://www.myspace.com/darkroomtheband

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[boost-1.33.1] broken mmap_file_iterator in spirit implementation details.
by Paweł Sikora 31 May '07

31 May '07

hi all, mmap based file_iterator implementation has a nasty bug. it treats empty files as non-existent. mmap() doesn't map empty files into memory, but boost's implementation omit this little detail of posix specification and return an error. in fact, empty file != doesn't exist. regards, pawel. -- to_be || !to_be == 1, to_be | ~to_be == -1

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Re: [Boost-users] Cross compiling boost
by Peter Poulsen 31 May '07

31 May '07

Has anybody tried compiling boost 1.34 for ARM? /peter >> >> I'm trying to build boost for an arm processor, but all the >> hidden bjam stuff is simply to much, so I have to ask for help :) >> >> All my build tools are in ~/arm-tools/. I'm on a Linux x86 >> and the cross compiler I'm trying to use is a gcc version 3.4.4. >> >> I have tried various build commands. The latest being: >> >> >> ~/boost_1_34_0 $ bjam --build-dir=/tmp/build-boost >> --toolset-gcc-3.4.4 --with-regex -sGXX=arm-wrs-linux-gnueabi-g++ stage >> >> >> But I still get: >> >> >> ~/boost_1_34_0 $ file stage/lib/libboost_regex-gcc34.so >> stage/lib/libboost_regex-gcc34.so: ELF 32-bit LSB shared >> object, Intel 80386, version 1 (SYSV), stripped >> >> Can anybody explain to me what I must do to compile >> boost-regex for arm? >> >> btw I have found others trying to do the same but they seem to end up hacking the >> bjam files, and I have no idea of how to that. >> >> /peter >> >> >> -- >> A: Because it messes up the order in which people normally read text. >> Q: Why is it such a bad thing? >> A: Top-posting. >> Q: What is the most annoying thing on usenet and in e-mail? >> >> >> >> >> _______________________________________________ >> Boost-users mailing list >> Boost-users(a)lists.boost.org >> http://lists.boost.org/mailman/listinfo.cgi/boost-users >> >> > > This message (including any attachments) contains confidential > and/or proprietary information intended only for the addressee. Any unauthorized > disclosure, copying, distribution or reliance on the contents of this information is > strictly prohibited and may constitute a violation of law. If you are not the > intended recipient, please notify the sender immediately by responding to this > e-mail, and delete the message from your system. If you have any questions about > this e-mail please notify the sender immediately. > _______________________________________________ > Boost-users mailing list > Boost-users(a)lists.boost.org > http://lists.boost.org/mailman/listinfo.cgi/boost-users > >

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Wave Driver Program
by ivan＠0x4849.net 31 May '07

31 May '07

Hi, I am using debian linux and wanted to access the Wave Driver program. It seems they have a package for the wave library but that doesnt seem to include the driver binary. I had a look in the code but couldn't find where the driver program's code is either. Is it the intention to release the driver as a C++ pre-processor binary similar to how cpp is used, or is the driver program just meant for one-off testing? In any case could someone point me to the code for the driver within the boost source tree? Thanks, Ivan --------------------- Ivan Novick http://www.0x4849.net

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iostream::mapped_file
by Richard_Morrey＠McAfee.com 31 May '07

31 May '07

A query about the above. I wish to use it to enable us to share memory amongst processes. Whilst it obviously should be possible to do this using CreateFileMapping on Windows and mmap on linux, which the class uses, the documentation is not clear as to whether it is designed be used in this way. Looking at the source code: (a) It does not provide a kernel name to the CreateFileMapping call on Windows. According to the MSDN docs this is the only way to share one mapping amongst multuiple processes, and therefore it is possible that a different mapping, albeit of the same file, is being created for each process. I don't want that as the point is to keep memory usage down. (b) On linux it only uses MEM_SHARED flag if the file is read only. If this flag isnt used, is there the possiblity that more than one copy of each page of the file will be loaded into physical memory too? Clarification on any of these points is most welcome Thanks Richard Morrey.

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iostreams build error in Visual Studio 2005
by Os 31 May '07

31 May '07

In file_descriptor.cpp I get a deprecation warning from line 219: lseek is deprecated in favour of _lseek. I've just patched my local copy, but could this be changed in the official version? cheers, os. -- os(a)collective.co.uk http://www.collective.co.uk/ http://www.myspace.com/darkroomtheband

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[multi_index] MSVC 8.0 visualizer for indexed_by<sequenced<>, ...> containers
by Filip Konvička 31 May '07

31 May '07

Hello all, for those interested, here is an alpha version of a MSVC-8.0 visualizer for multi_index_containers whose first index is sequenced<>. To try it out, insert autoexp.dat.txt contents into your Microsoft Visual Studio 8\Common7\Packages\Debugger\autoexp.dat For your container to be visualized, you need to call the VISUALIZE_MULTI_INDEX_CONTAINER macro at the global namespace level (see the attached example, test2.cpp, and the screenshot of a test2.cpp debugging session, sample.png). Comments / suggestions are welcome! Things that need attention: - of course, containers whose first index is not sequenced<> - maybe there is a better way of enforcing template instantiation...? - possible name conflict issues, you guys probably know better than I do :-) Cheers, Filip P.S.: My colleague says that this is black magic, so beware :-) #include "common.hpp" int wmain() { cont test_cont; test_cont.push_back(test(L"aaa")); test_cont.push_back(test(L"bbb")); test_cont.push_back(test(L"bbbx")); test_cont.push_back(test(L"bbbss")); test_cont.push_back(test(L"ccc", L"ddd")); return 0; // see screenshot } #ifndef MIC_VISUALIZER_HPP #define MIC_VISUALIZER_HPP template<typename T> struct multi_index_helper { }; template<typename T> struct multi_index_helper_2 { }; template<typename T> struct multi_index_helper_3 { }; #define __VISUALIZE_MIC_INDEX_DEF(Type) \ boost::multi_index::detail::multi_index_node_type< \ Type::value_type, \ Type::index_specifier_type_list, \ std::allocator<Type::value_type> >::type /// Enables MSVC visualizers for multi_index_container Type #define VISUALIZE_MULTI_INDEX_CONTAINER(Type) \ template<> \ struct multi_index_helper_2<Type> { \ typedef __VISUALIZE_MIC_INDEX_DEF(Type) index_node_type; \ typedef \ boost::base_from_member< \ boost::detail::allocator::rebind_to< \ std::allocator<Type::value_type>, \ index_node_type \ >::type> \ base_type; \ typedef \ boost::multi_index::detail::header_holder< \ index_node_type, Type> \ header_holder_type; \ typedef \ boost::multi_index::detail::multi_index_base_type< \ Type::value_type, \ Type::index_specifier_type_list, \ std::allocator<Type::value_type> >::type \ index_type; \ /* mimic multi_index_container layout */ \ base_type base; \ header_holder_type header; \ index_type index; \ unsigned int node_count; \ /* ensure that the debugger sees this template instance */ \ static void get() { \ multi_index_helper_2<Type> *ensure_inst=0; \ } \ }; \ template<> \ struct multi_index_helper_3<Type> { \ typedef __VISUALIZE_MIC_INDEX_DEF(Type) index_node_type; \ typedef \ boost::multi_index::detail::header_holder< \ index_node_type, Type> \ header_holder_type; \ typedef \ boost::multi_index::detail::multi_index_base_type< \ Type::value_type, \ Type::index_specifier_type_list, \ std::allocator<Type::value_type> >::type \ index_type; \ /* mimic multi_index_container layout from header field */ \ header_holder_type header; \ index_type index; \ unsigned int node_count; \ /* ensure that the debugger sees this template instance */ \ static void get() { \ multi_index_helper_3<Type> *ensure_inst=0; \ } \ }; \ template<> \ struct multi_index_helper<__VISUALIZE_MIC_INDEX_DEF(Type)> { \ typedef __VISUALIZE_MIC_INDEX_DEF(Type) index_node_type; \ /* mimic index_node_base<Type::value_type> layout */ \ Type::value_type value; \ /* ensure that the debugger sees this template instance */ \ static void get() { \ multi_index_helper<index_node_type> *ensure_inst=0; \ } \ }; #endif ;------------------------------- ; boost::multi_index_container ; boost::multi_index::detail::header_holder<boost::multi_index::detail::sequenced_index_node<*>,*>{ preview(#("multi_index_container data")) children( #( #list( head : *(((boost::multi_index::detail::sequenced_index_node_impl*)(boost::multi_index::detail::sequenced_index_node_trampoline<$T1>*)($c.member))->next_), size : ((multi_index_helper_3<$T2>*)&$c)->node_count, next : next_ ) : *(multi_index_helper<boost::multi_index::detail::sequenced_index_node<$T1> >*)(boost::multi_index::detail::sequenced_index_node<$T1>*)(boost::multi_index::detail::sequenced_index_node_trampoline<$T1>*)(&$e) ) ) } multi_index_helper<*> { preview(#($c.value)) children(#(value:$c.value)) } boost::multi_index::multi_index_container<*,*,*>{ preview(#($c.node_count, " nodes")) children( #( data:((multi_index_helper_2<boost::multi_index::multi_index_container<$T1,$T2,$T3> >*)&$c)->header, original members: [$c,!] ) ) }

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[lambda] return statement wrapper
by Johan Nilsson 31 May '07

31 May '07

Hi, does a return statement wrapper exist in Boost.Lambda? I'd like to be able to do something conceptually similar to the following: -- #include <boost/lambda/bind.hpp> #include <boost/lambda/lambda.hpp> #include <cassert> namespace lambda = boost::lambda; void bar(int) { // whatever } void foo() { int const shouldBe3 = ( lambda::bind(&bar, 1), lambda::bind(&bar, 2), lambda::return(3) // Yes, this conflicts with the regular "return" statement, but you get the idea )(); assert(3 == shouldBe3); } --- I know I can roll my own implementation or work around it, but I was just wondering if something like that already exists. Couldn't locate anything in the docs - did I miss something? / Johan

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unhandled exception (assertion) in Boost.Regexp regex_formatter with VS2005
by Andreas Sedlmeier 31 May '07

31 May '07

Hi. I am a relative newbie to two things: - Boost C++ libraries - Working with the standard C++ libraries and this is my first post on this list. Hello to everyone - I hope you'll forgive me if following question is simply stupid. I cant't even tell that. I currently need to wrap some of the functionality string algorithms and Boost.Regexp offers in Windows DLLs; the developemnt environment I use is VS2005. I started with the samples given in string algorithms which offer a different interface to some of the Boost.Regexp library. I slightly modified the sample and basically now have something like this: using namespace std; using namespace boost; string strInput ("abc__(456)__123__(123)__cde"); regex expression = "[0-9]+" string strReplaceWith("#$1#") string strResult = replace_all_regex_copy(str, expression, strReplaceWith ); This certainly does not make that much sense; its however user input I need to cope with and my problem is that I get an unhandled exception here which I cannot catch. Failure is exactly here (regex_format.hpp): template <class OutputIterator, class Results, class traits> void basic_regex_formatter<OutputIterator, Results, traits>::put(const sub_match_type& sub) { typedef typename sub_match_type::iterator iterator_type; iterator_type i = sub.first; while(i != sub.second) { put(*i); ++i; } } in the line "while(i != sub.second)" I saw that the MS standard C++ libraries compares the iterator types here. And, maybe because in my sample both - i and sub.second - are NULL here, it asserts with "string iterators incompatible". Does anybody know how to solve this problem ? Am I doing something completely wrong or is this maybe a incompatibility of Boost C++ with the MS standard C++ library and other compilers would behave different for my sample ? Any help or insight greatly appreciated. Andreas.

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Specifying library locations for g++
by Scott Meyers 31 May '07

31 May '07

I've built Boost 1.34 for VC8 and g++ 4.1.1 on WinXP. I'm testing my installation with a simple program that uses Boost.FileSystem and Boost.Regex. Compilation is no problem, and for VC8, all I have to do to get things to link is add the location of the Boost binaries to the LIB environment variable. I was hoping that all I had to do for g++ was do the same for the LIBRARY_PATH environment variable (per http://gcc.gnu.org/onlinedocs/gcc/Environment-Variables.html) but I get unresolved symbol errors during linking even after doing that. I played around with the -l option (per http://gcc.gnu.org/onlinedocs/gcc/Link-Options.html#Link-Options) but nothing I tried worked. I have the following relevant binaries in my Boost binary directory: libboost_regex-mgw41-1_34.a libboost_regex-mgw41-d-1_34.a libboost_regex-mgw41-mt-1_34.a libboost_regex-mgw41-mt-d-1_34.a libboost_regex-mgw41-mt-s-1_34.a libboost_regex-mgw41-mt-sd-1_34.a libboost_regex-mgw41-s-1_34.a libboost_regex-mgw41-sd-1_34.a boost_filesystem-mgw41-1_34.a boost_filesystem-mgw41-d-1_34.a boost_filesystem-mgw41-mt-1_34.a boost_filesystem-mgw41-mt-d-1_34.a libboost_filesystem-mgw41-1_34.a libboost_filesystem-mgw41-d-1_34.a libboost_filesystem-mgw41-mt-1_34.a libboost_filesystem-mgw41-mt-d-1_34.a libboost_filesystem-mgw41-mt-s-1_34.a libboost_filesystem-mgw41-mt-sd-1_34.a libboost_filesystem-mgw41-s-1_34.a libboost_filesystem-mgw41-sd-1_34.a Can somebody explain or point me to an explanation of what I need to do to get a program using Boost binaries to link? I'm hoping there's something as simple as with VC8 where I can just specify a directory to look in and have the linker magically figure everything out from there. I'd like to avoid explicitly having to add a new library to link against each time I start using a new compiled Boost library in a project. Incidentally, in the above list of files, I notice that for Boost.FileSystem, there are some archives that start with lib and some that do not, while for regex, all start with lib. Is this meaningful? Thanks, Scott

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