August 2008 - Boost-users - lists.preview.boost.org

Is the boost fusion documentation outdated?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 Is the documentation outdated or boost on my machine outdated?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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[Config] Reusing results of platform/compiler detection
by joel falcou 23 Aug '08

23 Aug '08

I've looked at the inner implementation of the config components but I didn't find any way to get a simple preprocessor indicating which compiler/platform have been detected. Basiaclly, my goal is to use boost comprehensive detection features to select my own platform/compiler code selection through #ifdef. I tried using Preprocessor magic over the BOOST_PLATFORM string but not to avail. Is there a way to do such a thing or can we request for a #define BOOST_DETECTED_XXX_PLATFORM/COMPILER definition ?

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boost::serialization of a template class
by Takeo 23 Aug '08

23 Aug '08

Hello, I have a base class: class base {...}; and a derived class: class derived : public base {...}; and a template class: template <class T> class ElementList { vector<T*>* m_Elements; ... friend class boost::serialization::access; template<class Archive> inline void serialize(Archive & ar, const unsigned int version) { ar & BOOST_SERIALIZATION_NVP(m_Elements); } } Now i create a class: class myclass : public ElementList<base> { friend class boost::serialization::access; template<class Archive> inline void serialize(Archive & ar, const unsigned int version) { ar & BOOST_SERIALIZATION_BASE_OBJECT_NVP(ElementList); } } I want to use boost::serialization on myclass I create somwhere in my program several "derived" elements (which are serialized at this point) After, I put them in the m_Elements vector of myclass (hérited from ElementList<base>). So, the "derived" are stored as "base" elements and the problem is that they are serialized as "base" elements and not "derived" elements. Have you got an idea of how I can solve this issue? Thanks by Advance Emmanuel -- View this message in context: http://www.nabble.com/boost%3A%3Aserialization-of-a-template-class-tp191093… Sent from the Boost - Users mailing list archive at Nabble.com.

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How to build specified type of library with bjam?
by Bill David 23 Aug '08

23 Aug '08

1.I have checked the Jamroot.jam file, it seems we can specify a build-type of minimal or complete. e.g. bjam --toolset=msvc-9.0 --with-regex --build-type=complete stage But it can not meet my requirement. For example, I just want to build debug release <threading>multi <link>static. How could I specify it? 2.it seems we can specify link/runtime-link options, what's the difference between link static and runtime-link static? Does libboost_regex-vc90-mt-gd-1_35.lib means it's a multi-threading debug version of static link edition of regex library? But how about libboost_date_time-vc90-mt-sgd-1_35.lib? What does the -sgd mean? What's the naming convention?

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