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Building iostreams with zlib and bzip2
by Peter McGill 25 Aug '08

25 Aug '08

I've read all the documentation on installing/building boost and iostreams. I have built and installed zlib and libbzip2 separately. I've set CPATH and LIBRARY_PATH in the environment to point to them. I'm using mingw on windows xp from the command prompt with boost 1.36. I've tried setting the variables described in the iostreams docs, but nothing happens. I've set the variables in the environment, in user-config.jam with path-constant. Nothing works, bjam always builds boost without zlib and bzip2 support, no errors. It doesn't even attempt to build support for zlib and bzip2. Please help, how do I build boost iostreams with zlib and bzip2 support? Peter McGill

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[Boost.Test] Using debuggers
by Florian Winter 25 Aug '08

25 Aug '08

When a debug version of a unit test application using Boost.Test crashes on Windows, no popup appears that asks for attaching the debugger. Instead, the process prints a stack dump to standard output and then exits normally. Attaching the debugger before the process crashes does not help. Although this is helpful when running tests automatically with no user interaction, it makes it very hard to manually debug unit tests that have crashed. According to the Boost.Test documentation, it is possible to pass framework parameters to Boost. In particular, there is a "catch system errors" parameter, which looks like it should be able to turn off this behavior (please correct me if I am wrong). http://www.boost.org/doc/libs/1_35_0/libs/test/doc/components/utf/parameter… http://www.boost.org/doc/libs/1_35_0/libs/test/doc/components/utf/parameter… We tried the following (on Windows) and then ran a test case which caused an access violation: set BOOST_TEST_CATCH_SYSTEM_ERRORS=no echo %BOOST_TEST_CATCH_SYSTEM_ERRORS The process still exited normally after printing a stack dump. We also tried using a command-line option: <TEST_APPLICATION> --catch_system_errors=no Same result as above. Is this intentional? Is there any way to prevent Boost.Test from catching system errors such as access violations (on Windows) and signals (on Linux and similar platforms) so that conventional debuggers can be used? Best regards, Florian

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Re: [Boost-users] a little Graph guidance (looking for hints)
by trashing＠gmx.net 25 Aug '08

25 Aug '08

> Carsten Hoyer wrote: > > Hi > > Just turned to Boost - What a fantastic library :) > > > > I have a question about the construction of a Graph. I can't figure out how > > to use boost to represent a graph where each Vertex has several outs. F.ex > > Vertex 1 has out 1, 2 and 3. Vertex A has in a, b and c. I can then make > > edges going from 1-a, 1-b, 2-b etc. Like F.ex > > http://messe.harmony-central.com/Musikmesse05/Content/Native_Instruments/PR… > > Reaktor > > > > Any hints? > > Thank you > > Carsten > > > add_edge(node1, node2, g); > add_edge(node1, node3, g); > add_edge(node1, node4, g); I think Raindog needs vertices with different property types, i.e. vertices should contain data of different type. Am I right? -- GMX startet ShortView.de. Hier findest Du Leute mit Deinen Interessen! Jetzt dabei sein: http://www.shortview.de/wasistshortview.php?mc=sv_ext_mf@gmx

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Is the boost fusion documentation outdated?
by Peng Yu 25 Aug '08

25 Aug '08

Hi, The following header, <boost/fusion/include/at_c.hpp>, is mentioned in http://spirit.sourceforge.net/dl_more/fusion_v2/libs/fusion/doc/html/fusion…. But I don't this header in the boost installation on my machine. Is the documentation outdated or boost on my machine outdated? Thanks, Peng

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Passing an argument to threads (boost::thread)
by Jean-Sebastien Stoezel 25 Aug '08

25 Aug '08

Hello, How to pass arguments to a thread? From the documentation I thought I could do this: mp_ProcessorListenerThread = new boost::thread(ProcessorListener, this); However I get the following error: 'boost::thread::thread' : no overloaded function takes 2 arguments Thanks, Jean

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[serialization] Uninformative exception thrown for binary_archive
by Sebastian.Karlsson＠mmorpgs.org 25 Aug '08

25 Aug '08

Hi, I'm getting an exception thrown in basic_binary_iprimitive.hpp at line 154 ( load_binary ). I don't have a clue what the error really is, but from debugging I can see it happen when the member _IGcount and _IPcount of m_sb reaches 0. Is it perhaps the buffer that runs out of memory? I'm simply using binary_[o/i]archive as a drop in replacement for the text variants for serialization. I'm using 1.36 and MSVC 8.0.

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How to do accumulation on boost::fusion::vector
by Peng Yu 24 Aug '08

24 Aug '08

Hi, I want to do accumulation on boost::fusion::vector. Please refer to the comment in the code. Can somebody let me know how to do it? Thanks, Peng #include <boost/fusion/sequence.hpp> #include <boost/fusion/include/at.hpp> #include <boost/fusion/container.hpp> #include <boost/fusion/iterator.hpp> #include <boost/typeof/typeof.hpp> #include <iostream> struct A { A(int value) : _value(value) { } int _value; }; struct B { B(int value) : _value(value) { } int _value; }; struct C { C(int value) : _value(value) { } int _value; }; template <typename T> int get_it(const T &t) { return t._value; } int main() { BOOST_AUTO(v, boost::fusion::make_vector(A(0), B(1), C(3), B(8), C(7))); // I want to make the following code more generic, the fusion vector length could be anything. // It sum over all the vector elements. int sum = get_it(boost::fusion::at_c<0>(v)) + get_it(boost::fusion::at_c<1>(v)) + get_it(boost::fusion::at_c<2>(v)) + get_it(boost::fusion::at_c<3>(v)) + get_it(boost::fusion::at_c<4>(v)); std::cout << sum << std::endl; }

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STL/fusion/MPL/graph/.. cheat-sheets?
by Zeljko Vrba 23 Aug '08

23 Aug '08

Maybe somebody has already asked this question.. Does there exist a cheat sheet / quick reference that would give a compressed overview of different concept requirements? Something like http://www.hoomanb.com/cs/QuickRef/CppQuickRef.pdf except that it would document concepts and requirements? For example, http://www.boost.org/doc/libs/1_36_0/libs/fusion/doc/html/fusion/sequence/c… in a bit more compressed format, grouped together with other concept tables.

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mpl::switch_
by joel falcou 23 Aug '08

23 Aug '08

Is it me or is mpl::swich_ both undocumented and non-working ? I managed to get this : template<typename Body, typename T> struct switch_ { typedef typename find_if<Body,apply1<first<_1>,T> >::type iter_; typedef typename deref<iter_>::type pair_; typedef typename second<pair_>::type f_; typedef typename apply1< f_, T>::type type; }; working properly. Seems the current swich_ use lambda<> where it shouldn't. Is this a known bug or is there something bound to replace switch_ in the near future ? SHould I fill a trac ticket about this ?

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[function] creating function object for member function call delegation
by Olaf Peter 23 Aug '08

23 Aug '08

Hi, the following code doesn't compile: ---8<--- #include <iostream> #include <boost/function.hpp> #include <boost/bind.hpp> using namespace std; using namespace boost; struct foo { function<void ( const string& )> fn; }; struct bar { foo& m_f; bar(foo& f) : m_f( f ) { m_f.fn = bind( bar::write, this); // L20 } void write( const string& s ) { cout << s; } }; int main() { foo f; bar b( f ); f.fn( "Hello\n" ); } --->8--- class foo (object f) gets called with the string argument and shall delegate the call to the write function of bar. Writing bind( bar::write, this, _1) doesn't make things better. Here the error message: $ LANG=en g++ callback.cpp -o callback callback.cpp: In constructor 'bar::bar(foo&)': callback.cpp:20: error: no matching function for call to 'bind(<unresolved overloaded function type>, bar* const)' /usr/include/boost/bind.hpp:1383: note: candidates are: boost::_bi::bind_t<boost::_bi::unspecified, F, typename boost::_bi::list_av_1<A1>::type> boost::bind(F, A1) [with F = void (bar::*)(const std::string&), A1 = bar*] /usr/include/boost/bind.hpp:1628: note: boost::_bi::bind_t<typename boost::_bi::dm_result<M T::*, A1>::type, boost::_mfi::dm<M, T>, typename boost::_bi::list_av_1<A1>::type> boost::bind(M T::*, A1) [with A1 = bar*, M = void ()(const std::string&), T = bar] Thanks for help, Olaf

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