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lexical_cast update + Boost.Test question
by Terje Slettebø 19 Jun '05

19 Jun '05

Hi. lexical_cast has now been updated in the CVS, with the following, as has been reported as bugs or suggested improvements: - Fixed so it doesn't trim any whitespace when converting (it used to throw on " 123" -> int, but not on "123 " -> int, which was inconsistent). - Fixed reversed bad_lexical_cast constructor arguments. - lexical_cast now uses pass-by-const reference. For compilers lacking support for partial specialisation of class templates (like MSVC 6), it falls back on pass-by-value. Sorry for the late update. It's been quite busy at work lately, so it's been hard to concentrate on non-work projects, but I'm now more on top of things. I'll read up on any lexical_cast-related postings, and can make subsequent updates, should it be desired. I'll also check up the results after the next regression test run, to see if there are any remaining issues. The changes are of course done in cooperation with Kevlin. It has been tested on Intel C++ 7.1, MSVC 2005 Final Beta, g++ 3.4 and Borland C++ Builder X, and all tests pass there. I get errors (from Boost.Test) when trying to run the test on MSVC 6, but testing lexical_cast by itself seems to work. Might Boost.Test have a problem with MSVC 6? By the way, I don't see the changes using the Boost ViewCVS, but it's listed e.g. with "log". Are the ViewCVS results cached, somehow, or may the commit have ended up on some other place than the trunk? I did make sure to check out the trunk, before commit. Regards, Terje

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Serialization and BGL
by Jean-Noël Rivasseau 19 Jun '05

19 Jun '05

Hello, I was wondering if one could use Boost serialization library with the Boost Graph Library. Specifically, if one my class holds a graph (for example, an adjacency_list class), is it possible to serialize it? From what I've read from the Boost serialization documentation, this doesn't seem possible as it eventually requires access to the class members; in the case of the BGL, the implementation of the classes is probably so complex that I wouldn't go through that route; plus, they may very well be private. I was wondering if there is any way to do serialization via the public interface of the BGL (ie, add_edge, etc...) ? If I understood the Serialization library correctly, everything works via the operator & which acts as >> and <<. If I define a << operator for the BGL classes, that implement the export / import operations, needed, would it be possible to use the BGL with serialization? Any help from knowledgeable people would be appreciated (I now have a quite good knowledge of the BGL but I am new to the serialization library). Jean-Noël

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boost.build : need help/bug specifying struct-alignment ?
by Seb Martel 18 Jun '05

18 Jun '05

Hi, I am trying to build boost.threads 1.32 statically with struct alignment set to 1. I dug up from the documentation that this should do the trick: bjam -sTOOLS=vc-7_1 "-sBUILD=debug <struct-alignment>1" -a -d+2 however, I don't see the alignment switch '/Zp1' on the command line : "cl" /Zm800 -nologo /EHsc -c -DBOOST_THREAD_LIB_NAME=boost_thread -DBOOST_THREAD_BUILD_LIB=1 /Z7 /Od /Ob0 /EHsc /GR /MDd /Op Zc:forScope /Zc:wchar_t -I"..\..\..\bin\boost\libs\thread\build" -I"C:\Program Files\Microsoft Visual Studio .NET 2003\VC7\include" I"G:\boost_1_32_0" -Fo"..\..\..\bin\boost\libs\thread\build\libboost_thread.lib\vc-7_1\debug\threading-multi\tss.obj" -Tp"..\..\..\libs\thread\build\..\src\tss.cpp" Is there something I am missing ? -seb

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[tokenizer/string_algo] splitting after a sequence
by Yuval Ronen 18 Jun '05

18 Jun '05

Hi. I need to tokenize a string according to a delimiter sequence, rather than the common "any-of-characters" algorithm. What I mean is that if I'll use the sequence "ab" to split the string "1ab2ab3", I'll get { "1", "2", "3" }, but if I'll use the same "ab" sequence to split a slightly different "1ab2ba3" string, I'll get { "1", "2ba3" }. I've looked at the tokenizer lib and string_algo's split method, but couldn't find any evidence that any of them already contain such a feature. Is there such a thing in Boost? Thanks, Yuval

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smart pointer declaration question
by Jack Nguyen 18 Jun '05

18 Jun '05

I currently have template <typename T> class Vector { private: int Size; boost::shared_array<T> mpD; void VecAlloc( int size) { boost::shared_array<T> mpD_temp(new T[size]); mpD=mpD_temp; } public: Vector() { } Vector(int size) :Size(size) { VecAlloc(size); } } My question is how do i get rid of boost::shared_array<T> mpD_temp(new T[size]); ???

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Generating a unique symbol
by Martin Slater 18 Jun '05

18 Jun '05

Hi there, Is there anything in boost that will generate a guarenteed unique symbol, possibly based on file and line? I've had a look through the preprocessor library but cannot see anything. Strict portabilty is not an issue as my only requirement is for vc7.1. thanks Martin

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Serialization problem in a shared library
by Tapio Vuorinen (JO/LMF) 18 Jun '05

18 Jun '05

Hi, I have a problem with usage of the serialization library in my DLL. I looked through the previous mail threads in this mailing list but I didn't find any solution for my problem there. I use Linux and the boost software version is 1.32.0. My software which uses serialization services is compiled with g++ and build as a shared library. When the library is loaded dynamically at runtime the static instance of the pointer_oserializer template class is not initialized correctly and causes crashing of my software. Maybe the serialization software contains other static instances also but the instance of pointer_oserializer is the one I always meet first when I debug my software. Is there any means to fix this? Or if the initialization problem of static instances within DLL is already fixed in later versions of boost, which of them? Thanks Tapio Vuorinen

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Problem in running the examples
by J Liu 17 Jun '05

17 Jun '05

I installed boost and trying to run the example for string algorithm. How could I make the example find the boost libs? coz it keeps telling me that the header can not be found. "Cannot open include file: 'boost/algorithm/string/trim.hpp': No such file or directory" I am running the example in the original folder. Thank you.

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Question regarding mem_fn or function
by Elisha Berns 17 Jun '05

17 Jun '05

Hi, My imagination fails me here: How can you use boost::mem_fn or boost::function to bind a class member function as a predicate function for use in std::sort? I tried this way and that and so far, nothing. Thanks, Elisha Berns e.berns(a)computer.org

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Failed to compile fstream_test.cpp on VC++ 6.0
by Jason Heyes 17 Jun '05

17 Jun '05

I receive errors when I try to compile fstream_test.cpp using Microsoft Visual C++ 6.0. The first error I receive is this: fstream_test.cpp c:\boost\include\boost-1_32\boost\filesystem\fstream.hpp(29): error C2504: 'basic_filebuf<char,char_traits<char> >': base class undefined c:\projects\examples\fstream_test.cpp(27): see reference to class template instantiation 'boost::filesystem::basic_filebuf<char,char_traits<char> >' being compiled Is there a workaround for this? Thanks.

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