[Bug c++/46719] [C++0x] Cannot call variadic function template

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46719

--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> 2010-11-30 
20:04:00 UTC ---
(In reply to comment #3)
> 
> Therefore compiler is unable to deduce template parameters that are Return,
> FirstType and ArgTypes.

Right, the lambda can be converted to double(*)(int) but that doesn't help. 

There is no valid conversion sequence that allows the compiler to deduce the
template arguments.

Here's a version without a lambda:

template <typename Return, typename... ArgTypes>
    struct function
    {
        template<typename Functor> function(Functor) { }
    };

template <typename Return, typename FirstType, typename... ArgTypes>
    int
    curry(function<Return(FirstType,ArgTypes...)> func, FirstType)
    {
        return 0;
    }

double f(int x) { return static_cast<double>(x); }

int main()
{
    return curry( f, 10 );
}