September 2005 - Boost-users

BGL - randomize_property & bundled properties
by Giulio Veronesi 17 Sep '05

17 Sep '05

Hi all, Is it possible to use the randomize_property routines with boundled properties? If so, could you please explain me how? For istance let us consider the following example: struct MyVertexAttr { int attr; }; typedef adjacency_list<vecS, vecS, bidirectionalS, MyvertexAttr, MyEdgeAttr> MyGraph; MyGraph g(...); Now I would like to randomly assign a number in [1,10] to the 'attr' property of each vertex. randomize_property<????????>(g, MyRandGenerator); What is the correct invocation of the randomize_property function? Thanks in advance, Giulio

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regex and ICU
by louis 17 Sep '05

17 Sep '05

Hi, I am trying to build the regex library with ICU (MSVC 6.0). I get the following error: Z:\dev\3rd\boost_1_33_0\boost/regex/icu.hpp(42) : error C2039: 'Locale' : is not a member of '`global namespace'' Any help would be greatly appreciated. Thanks Louis

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[Pre-processing] String Litereal Comparison for Equality
by Hossein Haeri 17 Sep '05

17 Sep '05

Dear all, Is there anyway (say using a utility in BOOST_PP) at pre-processing phase to compare string literals for equality? TIA, --Hossein ___________________________________________________________ Yahoo! Messenger - NEW crystal clear PC to PC calling worldwide with voicemail http://uk.messenger.yahoo.com

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Build errors and crash with 1.33.0 under Mac OS X CodeWarrior
by Allen Cronce 17 Sep '05

17 Sep '05

Hi all, I just updated from boost 1.32.0 to 1.33.0 for a CodeWarrior MSL/carbon project under Mac OS X. There were several build errors stemming from the fact that "check" is already defined in /usr/include/AssertMacros.h. For now I dealt with this my modifying my copy of the boost libraries to substitute _check for check. This is of course an ugly solution, but I wanted to move forward. Unfortunately now I'm seeing crashes with code that worked fine with 1.32.0. Here's some test code that demonstrates the crash: _tprintf(_T("\nTest a vector of boost shared_ptr's:\n")); typedef boost::shared_ptr<std::string> SharedPtrString; typedef vector<SharedPtrString> StringContainer; typedef vector<SharedPtrString>::iterator StringContainerIterator; { SharedPtrString sharedPtrString1(new std::string("Hi there!")); SharedPtrString sharedPtrString2(new std::string("Hi there!")); _tprintf( _T(" sharedPtrString1->c_str() = \"%s\"\n"), sharedPtrString1->c_str() ); _tprintf( _T(" sharedPtrString2->c_str() = \"%s\"\n"), sharedPtrString2->c_str() ); } // We never get here because of an access error Basically when the SharedPtrString goes out of scope, I get an access error deep in the allocation code. Does anyone have suggestions for resolving these issues? Note that I could go back to 1.32.0, but I want to use the new Pointer Container Library. Best regards, -- Allen Cronce

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[iostream]: Simple sinks result in runtime error
by Marius Renn 17 Sep '05

17 Sep '05

Hi all, This is my first post, so please let me know if I am doing anything wrong. I am having trouble using the new iostream headers in Boost 3.3. I cannot get simple Sinks to function correctly. Take the following code for example: namespace bio = boost::iostreams; int main() { typedef bio::stream<bio::null_sink> nullsink; nullsink out; out << "Ignore me"; } This code always results in a runtime assertion failure: /usr/local/include/boost/iostreams/detail/optional.hpp:54: failed assertion `initialized_' What am I doing wrong? Any help would be greatly appreciated. Cheers, Marius

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compiling boost.signals without exception
by Martin Sarrazac 17 Sep '05

17 Sep '05

Hi, compiler: mingw gcc 3.4.4 I would like to compile boost.signals without exception handling, I read somewhere about the <exception-handling> feature so I tried: bjam --builddir=c:\temp -sTOOLS=mingw "-sBUILD=debug <exception-handling>off <runtime-link>dynamic <threading>single" --libdir=C:\boost\lib\noe --with-signals -d2 install without success, it compiles fine but not without exception handling. specifically the -fno-exception command line option should be passed to gcc and it's not. I had a look at tools/build/v1/gcc-tools.jam and I found this line for rtti support for instance: flags gcc C++FLAGS <rtti>off : -fno-rtti ; However there is nothing equivalent for exceptions... On a side note I don't know how to give a new tag to the 'no exception' version of the library, so I compiled it in an other directory (--libdir=C:\boost\lib\noe). However I would much prefer to give it a specific name. Is there somewhere information about all the -sBUILD flags can be found? Can't seem to locate it. Thanks for your help

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Problems going from Serialization 1.32 to 1.33
by Stefan Arentz 17 Sep '05

17 Sep '05

Hello fellow Boost users, Consider the following program: #include <sstream> #include <string> #include <vector> #include <boost/archive/text_oarchive.hpp> #include <boost/serialization/base_object.hpp> #include <boost/serialization/string.hpp> #include <boost/serialization/vector.hpp> template <typename T> std::string archive(T thing) { std::ostringstream oss; boost::archive::text_oarchive oa(oss); oa << thing; return oss.str(); } typedef std::vector< std::string > parameters_t; int main() { parameters_t parameters; parameters.push_back("a"); parameters.push_back("b"); std::string s = archive<parameters_t>(parameters); return 0; } When I compile this with Boost 1.32 it compiles and works fine. However, with Boost.1.33 it fails with: /usr/local/include/boost/archive/detail/oserializer.hpp: In function `void boost::archive::save(Archive&, T&) [with Archive = boost::archive::text_oarchive, T = std::vector<std::string, std::allocator<std::string> >]': /usr/local/include/boost/archive/basic_text_oarchive.hpp:78: instantiated from `void boost::archive::basic_text_oarchive<Archive>::save_override(T&, int) [with T = std::vector<std::string, std::allocator<std::string> >, Archive = boost::archive::text_oarchive]' /usr/local/include/boost/archive/detail/interface_oarchive.hpp:85: instantiated from `Archive& boost::archive::detail::interface_oarchive<Archive>::operator<<(T&) [with T = parameters_t, Archive = boost::archive::text_oarchive]' test.cpp:16: instantiated from `std::string archive(T) [with T = parameters_t]' test.cpp:28: instantiated from here /usr/local/include/boost/archive/detail/oserializer.hpp:566: error: incomplete type `boost::STATIC_ASSERTION_FAILURE<false>' does not have member `value' I'm not sure what to change. Is this correct behaviour? S.

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Re: [Boost-users] Help on Boost.MultiArray
by Adewole, Mike 16 Sep '05

16 Sep '05

> -----Original Message----- > From: boost-users-bounces(a)lists.boost.org > [mailto:boost-users-bounces@lists.boost.org] On Behalf Of > Sohail Somani > Sent: Friday, September 16, 2005 2:44 PM > To: boost-users(a)lists.boost.org > Subject: Re: [Boost-users] Help on Boost.MultiArray > > > > -----Original Message----- > > From: boost-users-bounces(a)lists.boost.org > > [mailto:boost-users-bounces@lists.boost.org] On Behalf Of > > Adewole, Mike > > Sent: Friday, September 16, 2005 10:46 AM > > To: boost-users(a)lists.boost.org > > Subject: [Boost-users] Help on Boost.MultiArray > > > > > > Hi all, > > > > Does anyone know how to insert and delete a range of rows > > and/or columns in the multiarray class documented at > > http://www.boost.org/libs/multi_array/doc/ ? What > > performance guarantees can I expect for these operations ? > > > > I'm a little pressed for time and haven't been able to figure > > out how to do this on my own. The statement that "The number > > of elements will remain fixed for the duration of a > > multi_array's lifetime" on the documentation page suggests > > that these operations may not even be supported, but I'm not > > sure if I'm misunderstanding the statement or not. > > I don't think you can insert/delete stuff like in a vector. > Seemed to me too that the library doesn't support insertions/deletions but I had to be sure before doing this thing the hard way. Thanks a million. Mike

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[filesystem] function to determine available space
by Beman Dawes 16 Sep '05

16 Sep '05

I'm planning to add a filesystem function to determine available disk space. Perhaps something like: struct space_status { boost::uintmax_t available; // free space available to user boost::uintmax_t total; // total space on volume }; space_status filesystem_space( const path & p ); Comments? Better suggestions for the names? --Beman

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Re: [Boost-users] Help on Boost.MultiArray
by Sohail Somani 16 Sep '05

16 Sep '05

> -----Original Message----- > From: boost-users-bounces(a)lists.boost.org > [mailto:boost-users-bounces@lists.boost.org] On Behalf Of > Adewole, Mike > Sent: Friday, September 16, 2005 10:46 AM > To: boost-users(a)lists.boost.org > Subject: [Boost-users] Help on Boost.MultiArray > > > Hi all, > > Does anyone know how to insert and delete a range of rows > and/or columns in the multiarray class documented at > http://www.boost.org/libs/multi_array/doc/ ? What > performance guarantees can I expect for these operations ? > > I'm a little pressed for time and haven't been able to figure > out how to do this on my own. The statement that "The number > of elements will remain fixed for the duration of a > multi_array's lifetime" on the documentation page suggests > that these operations may not even be supported, but I'm not > sure if I'm misunderstanding the statement or not. I don't think you can insert/delete stuff like in a vector.

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