February 2007 - Boost-users - lists.preview.boost.org

guid
by Christian Henning 23 Feb '07

23 Feb '07

Hi there, I find it a bit weird why the guid needs to be built. I think the designer did it because of the sha1 lib. But how about having guid lib header only when you want everything but the create_v5 part? I think that would make sense. I wouldn't mind reorganizing the code. Christian

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[serialization] conditional serialization of members and base classes
by n.torrey.pines 23 Feb '07

23 Feb '07

Hi The logic I want to implement is: * b contains a * when saving b, save a, followed by other data * when loading b, load a into a temporary, if it matches b.m_a, load other data Would you expect the following code to work? class b { a m_a; // a is serializable vector<int> m_v; // other data template<class Archive> void save(Archive& ar, const unsigned version) const { ar & m_a; ar & m_v; } template<class Archive> void load(Archive& ar, const unsigned version) { a tmp; ar & tmp; if(tmp == m_a) ar & m_v; } // ... }; Now, what if b is derived from a instead of containing it? Would this work? class b : public a { vector<int> m_v; // other data template<class Archive> void save(Archive& ar, const unsigned version) const { ar & boost::serialization::base_object<a>(*this); ar & m_v; } template<class Archive> void load(Archive& ar, const unsigned version) { a tmp; ar & tmp; if(tmp == static_cast< const a& >(*this)) ar & m_v; } // ... }; Thanks!

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[Review][Bimap] Bimap review extended until March 2nd
by Ion Gaztañaga 22 Feb '07

22 Feb '07

Hi to all, Bimap review has been extended until March 2nd. I encourage all boosters to give a try to this great library. The links are: Start reading the documentation here: http://tinyurl.com/y95qng And download the library here: http://boost-consulting.com/vault/index.php?&directory=Containers Regards, Ion

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feature request: documentation on possible linker problems
by Maarten Nieber 22 Feb '07

22 Feb '07

Hi, is it possible to add some documentation about possible linker conflicts when boost is used inside dlls and static libs? At the moment, my colleagues worry about using boost in our dlls or static libs, because when we give our (binary) libraries to a third party, the boost symbols in our libraries might give a conflict with boost symbols in the executable of the third party. I tried to solve this puzzle myself, but could not find a conclusive answer, which leads me to believe that this issue may be relevant for the boost documentation. Notably, I'm interested to know if this problem can occur if we only use boost header files but not binaries. Thanks in advance, Maarten Nieber ____________________________________________________________________________________ No need to miss a message. Get email on-the-go with Yahoo! Mail for Mobile. Get started. http://mobile.yahoo.com/mail

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(no subject)
by Maarten Nieber 22 Feb '07

22 Feb '07

Hi, is it possible to add some documentation about possible linker conflicts when boost is used inside dlls and static libs? At the moment, my colleagues worry about using boost in our dlls or static libs, because when we give our (binary) libraries to a third party, the boost symbols in our libraries might give a conflict with boost symbols in the executable of the third party. I tried to solve this puzzle myself, but could not find a conclusive answer, which leads me to believe that this issue may be relevant for the boost documentation. Notably, I'm interested to know if this problem can occur if we only use boost header files but not binaries. Thanks in advance, Maarten Nieber ____________________________________________________________________________________ Be a PS3 game guru. Get your game face on with the latest PS3 news and previews at Yahoo! Games. http://videogames.yahoo.com/platform?platform=120121

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Re: [Boost-users] How to access bundled properties individually?
by Shufei Fan 22 Feb '07

22 Feb '07

This question is regarding to BGL, I should have included it on the title. Actually, thank goes to Aaron Windsor. From: fansf(a)hotmail.comTo: boost-users(a)lists.boost.orgSubject: How to access bundled properties individually?Date: Thu, 22 Feb 2007 19:39:10 +0000 First, Thank Doug for answering my previous question on parallel edges. Now, my question is:How to access bundled property individually? I defined my graph like this: struct Node{ int label; int mode[3]; //...;};struct Edge{ double nCommBord;}; typedef boost::adjacency_list< boost::setS, boost::vecS, boost::undirectedS, Node, Edge> Graph;but when I want to access property nCommBord of Edge, there seems to be wrong with my property_map type definition. Anyone can point out for me, what is the right version(I cannot seem to find any comment on this kind of usage)? //get edgeWeight propertyproperty_map<Graph, &Edge::nCommBord>::type p_e = get(&Edge::nCommBord, *rowGraph); The error:c:\...\VCProjects\...xxx.cpp(55) : error C2974: 'boost::property_map' : invalid template argument for 'Property', type expected c:\Boost\include\boost-1_33_1\boost\graph\properties.hpp(205) : see declaration of 'boost::property_map'Thanks, Shufei Connect to the next generation of MSN Messenger Get it now! _________________________________________________________________ Explore the seven wonders of the world http://search.msn.com/results.aspx?q=7+wonders+world&mkt=en-US&form=QBRE

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How to access bundled properties individually?
by Shufei Fan 22 Feb '07

22 Feb '07

First, Thank Doug for answering my previous question on parallel edges. Now, my question is: How to access bundled property individually? I defined my graph like this: struct Node{ int label; int mode[3]; //...;};struct Edge{ double nCommBord;}; typedef boost::adjacency_list< boost::setS, boost::vecS, boost::undirectedS, Node, Edge> Graph; but when I want to access property nCommBord of Edge, there seems to be wrong with my property_map type definition. Anyone can point out for me, what is the right version(I cannot seem to find any comment on this kind of usage)? //get edgeWeight propertyproperty_map<Graph, &Edge::nCommBord>::type p_e = get(&Edge::nCommBord, *rowGraph); The error: c:\...\VCProjects\...xxx.cpp(55) : error C2974: 'boost::property_map' : invalid template argument for 'Property', type expected c:\Boost\include\boost-1_33_1\boost\graph\properties.hpp(205) : see declaration of 'boost::property_map' Thanks, Shufei _________________________________________________________________ Connect to the next generation of MSN Messenger http://imagine-msn.com/messenger/launch80/default.aspx?locale=en-us&source=…

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[mpl::math] exponential metafunction for complex types
by Chris Weed 22 Feb '07

22 Feb '07

Hi, I am getting the wrong result for the exponential of complex numbers such as the following: #include <boost/mpl/math/double.hpp> #include <boost/mpl/math/complex_number.hpp> #include <iostream> int main() { typedef boost::mpl::math::string_c_to_double<'-',2,'.',0>::type minus_two; typedef boost::mpl::times<minus_two,boost::mpl::math::pi<boost::mpl::math::double_tag> >::type minus_two_pi; typedef boost::mpl::math::complex_number<double_zero,minus_two_pi> imag_minus_two_pi; std::cout << imag_minus_two_pi() << std::endl; std::cout << boost::mpl::math::exponential<imag_minus_two_pi>::type() << std::endl; return 0; } This prints: 0-6.28319i 1.0329-0.0109834i which should be 0-6.28319i 1.0000-0.00000i Chris

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[multi_index] view with less items than in container possible?
by Boris 22 Feb '07

22 Feb '07

The various indexes of the multi_index_container help to access items in a container differently. Is it also possible to create an index somehow with access to less items in the container? If there is for example a container with employees and I often need to iterate over female employees only is there a way to create an index for this (there could be a bool in the employee class to indicate who is female)? Boris

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boost_1_30_0\boost\crc.hpp(389) : warning C4245: 'initializing' : conversion from 'int' to 'const boost::detail::mask_uint_t<16>::least', signed/unsigned mismatch
by ERIC BERTRAND 22 Feb '07

22 Feb '07

I have this warning on Visual studio 2005. I want to get rid of theses warning. It apperas at line BOOST_STATIC_CONSTANT( least, sig_bits = (~( least(0u) )) ); if I cast (least)(~( least(0u) )) I have not the warning. I want to be sure this is acceptable. Can someone confirm to me? Thanks -- --------------------------------------------------------- erbere erbere(a)gmail.com

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