August 2003 - Boost-users - lists.boost.org

A Quick Question about Threads
by Paul Grenyer 01 Aug '03

01 Aug '03

Hi All I'm planning on replacing all our (Win32 API Wrapped) threads with the boost threads. I was looking at the thread class interface and there isn't a method to ask if the thread is still running. This is something we use quite a lot in out current wrapper. To get around this I was thinking of using a member variable in the function object that is passed to the thread constructor to indicated whether the thread had finished. Is there a better way? I've not had a really good look at the docs yet, but there doesn't appear to be a Critical Section class. Should I be using the Mutex for synchronisation instead? -- Regards Paul Paul Grenyer Email: pjgrenyer(a)iee.org Web: www.paulgrenyer.co.uk EvaneScence: http://www.evanescence.com

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Graph Library: Ordered Vertex List?
by dmatt001 01 Aug '03

01 Aug '03

Hi Guys, I would like to use an ordered vertex list (ie based on property type) in an implementation that I am working on such that duplication can be avoided. I have read and understand how to implement an ordered edge list thanks to the previous posts but am finding it hard to get started! Perhaps I have missed the key example? It appears that from the way config::VertList is constructed that it may be a similar process in nature? adj_list_impl::add_vertex appears to discard the boolean return value from the associative insertion. Would such a construction allow me to avoid the duplication I seek to avoid? I am guessing so, but some advice would give me a confidence "boost". ( <-- It's a lame pun: I really do need help ;-) ) My first steps are below rehashing the excellent ordered edges example with a simple search/replace and maching my target container base. I'll keep plugging along with it anyway and it may just compile one day. Suggestions/Ideas/Refs/Ptrs are appreciated. Matt --- first guess follows --- template <class VertDesc> struct order_by_name : public std::binary_function<VertDesc,VertDesc,bool> { bool operator()(const VertDesc& v1, const VertDesc& v2) const { // Order by vertex name. return boost::get(boost::vertex_name, v1) < boost::get(boost::vertex_name, v2); } }; #if !defined BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION struct ordered_set_by_nameS { }; namespace boost { template <class ValueType> struct container_gen<ordered_set_by_nameS, ValueType> { typedef std::set<ValueType, order_by_name<ValueType> > type; }; } #else struct ordered_set_by_nameS { template <class T> struct bind_ { typedef std::multiset<T, order_by_name<T> > type; }; }; namespace boost { template <> struct container_selector<ordered_set_by_nameS> { typedef ordered_set_by_nameS type; }; } #endif

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Compile time Problem with boost::type_traits library
by Amit Bhatia 01 Aug '03

01 Aug '03

Hello, I am trying to use the boost::function library which in turn includes many of the headers from other boost libraries. I am using g++ 3.2 with: g++ -c -g -fwritable-strings -Wno-deprecated -static -ansi -pedantic -DANSI_HEADERS -D_G_HAVE_BOOL as the options. The file is_integral.hpp and the file is_convertible.hpp in the type_traits library contain the declarations of the type long long which the ISO C++ seemingly doesn't accept. The compiler gives the warning: ISO C++ does not support `long long' . I don't think there is a new version of this on boost. I downloaded the boost lib sometime in June Version 1.30.0. Can this problem be because of any of the compiler options that I am using? thanking you, regards, amit.

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Spirit Sequential-or
by Bruno Martínez 01 Aug '03

01 Aug '03

Hi boosters, In operators.html (a || b) is said to be equivalent to (a | b | a >> b), but, if I understand precedence correctly, it should be equivalent to (a >> b | a | b). I'm just learning Spirit, so this may probably be my mistake, right? Cheers, Bruno Martinez ---------------------------------------------------- ATENCION Su servicio de correo tiene antivirus ?? @internet URUGUAY: http://www.internet.com.uy

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