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status of boost::signal multi-threading support
by Stephen torri 10 Jan '05

10 Jan '05

What is the state of the multi-threading support for boost::signals? Stephen

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About indirect_iterator
by Jens Theisen 10 Jan '05

10 Jan '05

Hello, I want to use indirect_iterator and noticed that it subscript operator returns a proxy. I found the following explanation in iterator_facade.h: // A proxy return type for operator[], needed to deal with // iterators that may invalidate referents upon destruction. // Consider the temporary iterator in *(a + n) But I still don't understand why a proxy is necessary in some cases. Thank you in advance, Jens

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Writing regular expression
by Asha V.G. 10 Jan '05

10 Jan '05

Hi I want to do a search for a regular expression for '$':Matches the end of the string. e.g.: 'script$' should select vbscript as well as javascript. How can I do this? Regards Asha

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Determining Type and Extracting Data from private class member vector<boos::variant<> >
by Matthew Jankowski 10 Jan '05

10 Jan '05

Hi all, I'm new to Boost and have some questions about how to get data out of a vector<boost::variant<> > container. For this purpose I put together 'class Base' which holds a vector<boost::variant <Base*, DerivedBase*> > Pointers. I wrote a function template to insert pointers, but I have real difficulty extracting pointers. For example, if I insert 3 Base* pointers and 2 DerivedBase* pointers, I need to be able to extract the 3 Base * pointers and the 2 DerivedBase* pointers at a later point in time. To this end, class Base* has another member function 'template< typename C> int numPointer( C * InPointer)' which is intended to count the number of pointers found in the container. template< typename C> int numPointer(C* InPointer) has a few problems: 1) typeid(Pointers[i]) returns the 'variant' typeid when I really need to know the typeid of the ith pointer in 'Pointers'. 2) There must be a better, more elegant (and safe) way to make use of the boost library to accomplish just what I want. int main() { Base * TempBase = new Base(); DerivedBase * TempDeri = new DerivedBase(); TempBase->insert(TempBase); TempBase->insert(TempBase); TempBase->insert(TempDeri); std::cout << "Base:" << TempBase->numPointer(TempBase) << endl; //Expect "Base:2" get "Base:0" because of typeid(). std::cout << "Deri:" << TempBase->numPointer(TempDeri) << endl; //Expect "Deri:1" get "Deri:0" because of typeid(). } class Base { private: vector<boost::variant <Base*, DerivedBase*> > Pointers; public: Base(); virtual ~Base(); template <typename C> void insert( C * inC ) { Pointers.push_back(inC); } template <typename C> int numPointer( C* inC ) { int counter(0); for ( int i(0); i < int(Pointers.size()); i++ ) { cout << "type:" << typeid(inC).name() << endl; cout << "typeP:" << typeid(Pointers[i]).name() << endl; //Will give the id of the container not Pointer[i]. //if( boost::is_same<Pointers[i],typeid(inC).name()>::value ){ //Compilation error if ( typeid(inC).name() == typeid(Pointers[i]).name() ) { counter++; } } return counter; } }; //Base Any advice on how to improve this code and/or make better use of the boost library is fully appreciated. Thanks, Matt

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boost::filesystem::path question
by GIE 10 Jan '05

10 Jan '05

how to i append directory containing space char? following test failes. boost::filesystem::path p; p/="test 1"; MS VC 7.1

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please help building boost::date_time
by Soeren.Meyer-Eppler 08 Jan '05

08 Jan '05

Hello everybody, I have some problems trying to build the date_time libraries. I'm using: boost 1.32.0 stlport 4.6.2 MSVC7.1 (on Windows of course) with the following build command line: C:\Development\boost_1_32_0>bjam "-sTOOLS=vc-7_1-stlport" "-sSTLPORT_PATH=c:/Development" "-sstlport-iostream=on" the first build error I get is the following (which causes a whole cascade to follow): [...] C:\Development\boost_1_32_0\boost\lexical_cast.hpp(150) : error C2679: binary '>>' : no operator found which takes a right-hand operand of type 'boost::date_time::date_names_put<Config,charT,OutputIterator>::string_type' (or there is no acceptable conversion) [...] All of the other boost libraries build and link fine, so I don't think it's a general problem with my setup. I'd appreciate any hints or tips. Or if someone could even send me the prebuilt 'libboost_date_time-vc71-mt-p-1_32.lib' I'd be most grateful. Thanks, Sören Meyer-Eppler -- www.BuschnicK.net

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Boost1.32 VC7.0 multi_index bidirectional-map-like code wont compile...
by Dan Dimerman 08 Jan '05

08 Jan '05

Hello, I'm trying to compile code similar to (copied and pasted from) the bidirectional map example, but my VC7.0 burps some errors and then an INTERNAL COMPILER ERROR. The code looks like this: #include <boost/multi_index_container.hpp> #include <boost/multi_index/member.hpp> #include <boost/multi_index/key_extractors.hpp> using boost::multi_index_container; using namespace boost::multi_index; typedef unsigned long uid_t; typedef struct { uid_t _uid; vertex_descriptor _vertex; } node; struct uid {}; struct vertex {}; typedef multi_index_container < node, indexed_by< ordered_unique< tag< uid >, BOOST_MULTI_INDEX_MEMBER( node, uid_t, _uid ) >, ordered_unique< tag< vertex>, BOOST_MULTI_INDEX_MEMBER( node, vertex_descriptor, _vertex ) > > > node_set_t; and some of the errors I get are: c:\...\multi_index\detail\msvc_index_specifier.hpp(45) : error C2504: 'node_class' : base class undefined c:\...\multi_index\detail\msvc_index_specifier.hpp(45) : error C2143: syntax error : missing ',' before '<' c:\...\multi_index\detail\msvc_index_specifier.hpp(52) : error C2039: 'index_class' : is not a member of 'boost::multi_index::detail::msvc_index_specifier<IndexSpecifier>::fake_index_type<__formal>' (repeated several times) I am sure I am doing something very dumb. Any help will be greatly appreciated. Thanks Dan

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Re: [Boost-users] why doesn't scoped_ptr have a custom
by tom gee 08 Jan '05

08 Jan '05

If you intention is to release the pointer, reset(0) can achieve this. The document says: "void reset(T * p = 0); // never throws Deletes the object pointed to by the stored pointer and then stores a copy of p ". With reset, you should be able assign another pointer.

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bind.hpp does not compile with Metrowerks CodeWarrior
by Philippe Mori 08 Jan '05

08 Jan '05

The following line (starting at line 130 of boost/bind.hpp) does not compile: #if !( defined(__MWERKS__) && BOOST_WORKAROUND(__MWERKS__, <= 0x3003) ) template<class R, class T> inline _mfi::dm<R, T> unwrap(R T::* * pm, int) { return _mfi::dm<R, T>(*pm); } #if !BOOST_WORKAROUND(__IBMCPP__, BOOST_TESTED_AT(600)) // IBM/VisualAge 6.0 is not able to handle this overload. template<class R, class T> inline _mfi::dm<R, T> unwrap(R T::* const * pm, int) { return _mfi::dm<R, T>(*pm); } #endif #endif I got the following message: Error : ')' expected bind.hpp line 132 template<class R, class T> inline _mfi::dm<R, T> unwrap(R T::* * pm, int) (the second * is underlined) and then many more errors. If a comment out the previous lines, the file properly compile. To have this error, I just need to include <boost/bind.hpp> file in my code. I am using CodeWarrior 9.3 for Palm and the version as given by __MWERKS__ is 0x3004. If I changes 0x3003 for 0x3004 (at line 130), it compile file (so the workaround is still required). Could one boost developper make the changes? I am using boost 1.32.0.

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Where can I find an example of converting a seconds into a date using boost::date_time?
by Stephen torri 08 Jan '05

08 Jan '05

I need an example of taking a time duration in seconds and converting it to a date using Boost::Date_Time. For example, 805168227 seconds (time from December 31st, 1969, at 4:00 P.M.) = approx. 25 years, 194 days, 1 hr, 50 minutes, 27 seconds = File created on 1994 June 15 5:50:27 (Conversion did not account for leap years). Stephen

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