Hi!

I have a problem with std::mem_fun_ref and boost::tuple. Here is my code:
I have small LevelSetter class. It makes a level vector indexed by a transform_iterator value.

template <typename LevelType>
class LevelSetter {
private:
    int nmb_of_elements;
public:
    LevelSetter(int nmb_of_elements_) : nmb_of_elements(nmb_of_elements_) {}

    template <typename TrRange>
    std::vector<LevelType> set(TrRange range) {
        typedef typename TrRange::first_type TrIter;
        std::vector<LevelType> levels(nmb_of_elements);
        for (TrIter it = range.first; it != range.second; ++it) {
            levels[*it] = 0.0;
        }
        // much more complicated code
        return levels;
    }
};

Let's call it:

class MemFunRefTest { private: typedef float Scalar; typedef boost::tuple<int, Scalar> Tuple; typedef std::vector<Tuple> Fwd; typedef Fwd::iterator FwdIter; typedef std::pair<FwdIter, FwdIter> FwdRange; Fwd elements; public: MemFunRefTest() { elements.push_back(Tuple(0, 400.0)); elements.push_back(Tuple(1, 120.0)); elements.push_back(Tuple(2, 150.0)); } void fun() { FwdRange element_range = std::make_pair(elements.begin(), elements.end()); LevelSetter<Scalar> setter(elements.size()); setter.set(std::make_pair( boost::make_transform_iterator( element_range.first, std::mem_fun_ref(&Tuple::get<0>) ), boost::make_transform_iterator( element_range.second, std::mem_fun_ref(&Tuple::get<0>) ) ) ); } };

When I try to compile i get:

error: call of overloaded 'mem_fun_ref(<unresolved overloaded function type>)' is ambiguous candidates are: c:\mingw-4.6\bin\..\lib\gcc\i686-pc-mingw32\4.6.1\..\..\..\..\include\c++\4.6.1\bits\stl_function.h:697: std::mem_fun_ref_t<_Ret, _Tp> std::mem_fun_ref(_Ret (_Tp::*)()) [with _Ret = int&, _Tp = boost::tuples::cons<int, boost::tuples::cons<float, boost::tuples::null_type> >] c:\mingw-4.6\bin\..\lib\gcc\i686-pc-mingw32\4.6.1\..\..\..\..\include\c++\4.6.1\bits\stl_function.h:702: std::const_mem_fun_ref_t<_Ret, _Tp> std::mem_fun_ref(_Ret (_Tp::*)()const) [with _Ret = const int&, _Tp = boost::tuples::cons<int, boost::tuples::cons<float, boost::tuples::null_type> >]

What am I missing?
Thanks, Miklos