unordered map broken msvc, C++ (vc++)

unordered map broken msvc

#include <unordered_map>
#include <functional>
#include <algorithm>

template<class A, class B>
std::pair<B, A> flippedPair(const std::pair<A, B> & _pair) {
    return std::pair<B, A>(_pair.second, _pair.first);
}

template< class KeyTy, class MappedTy,

class NewHasher = std::hash<MappedTy>,
    class NewKeyeq = std::equal_to<MappedTy>,
    class NewAlloc = std::allocator<std::pair<const MappedTy, KeyTy> >,

template<class ...> class MapT, class ... Ts>

auto flipped_unorderedMap(MapT<KeyTy, MappedTy, Ts ...> const& _src,
            NewHasher * = (std::hash<MappedTy>*)0,
            NewKeyeq * = (std::equal_to<MappedTy>*)0,
            NewAlloc * = (std::allocator<std::pair<const MappedTy, KeyTy>>*)0
            ) {
        MapT<MappedTy, KeyTy,
        NewHasher,
        NewKeyeq,
        NewAlloc
            > dst;
        std::transform(_src.begin(), _src.end(), std::inserter(dst, dst.begin()),
                &flippedPair<KeyTy, MappedTy>);

return dst;
    }

int main( )
{
    std::unordered_map<int , int, std::hash<int> > map; // = {{0,1 }, {2, 4 }, {1, 3 } } ;
    auto nmap  = flipped_unorderedMap(map, (std::hash<int>*)nullptr);
}


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