[Boost-users] BOOST_FOREACH is not working under VC7.0

From: Yaroslav Yanovsky (zellis_at_[hidden])
Date: 2005-01-17 02:40:53

Hello boost-users,

I know, BOOST_FOREACH is not distributed with boost, but I don't know
where else should I write about it so I decided to post it here.
BOOST_FOREACH is not compiling under VC 7.0
Here I've wrote small example that represents problem:
-----------------------
#include <iostream>
#include <list>
#include <boost/foreach.hpp>

using std::list;

class BNamespace {
public:
        list<int> contents;

        int Find(int what) const;
};

inline int BNamespace::Find(int what) const {
        BOOST_FOREACH (int i, this->contents)
        //BOOST_FOREACH (const int& i, this->contents) // will fail too
        if (i==what)
                return i;

        return 0;
}

int main() {
        BNamespace lst;
        lst.contents.push_back(4);
        lst.contents.push_back(5);
        lst.contents.push_back(6);
        int i=lst.Find(6);
        std::cout<<i<<std::endl;
        return 0;
}
-----------------------
Compilation of this code on VC 7.0 leads to following errors:
a.cpp(15) : error C2667: 'boost::for_each::wrap' : none of 2 overloads have a best conversion
        f:\Libs\boost\boost\foreach.hpp(138): could be 'boost::for_each::container<T,boost::mpl::true_> boost::for_
each::wrap(const T &)'
        f:\Libs\boost\boost\foreach.hpp(132): or       'boost::for_each::container<T,boost::mpl::false_> boost::for
_each::wrap(T &)'
        while trying to match the argument list '(const std::list<_Ty,_Ax>)'
        with
        [
            _Ty=int,
            _Ax=std::allocator<int>
        ]
a.cpp(15) : error C2668: 'boost::for_each::wrap' : ambiguous call to overloaded function
        f:\Libs\boost\boost\foreach.hpp(138): could be 'boost::for_each::container<T,boost::mpl::true_> boost::for_
each::wrap(const T &)'
        f:\Libs\boost\boost\foreach.hpp(132): or       'boost::for_each::container<T,boost::mpl::false_> boost::for
_each::wrap(T &)'
        while trying to match the argument list '(const std::list<_Ty,_Ax>)'
        with
        [
            _Ty=int,
            _Ax=std::allocator<int>
        ]
-----------------------

I've tried to compile same code with MinGW and it succeded.
Can anyone help me with this problem?
Thanks!

-- 
Best regards,
 Yaroslav                          mailto:yaroslav_at_[hidden]