Map wrapper using class template argument deduction (CTAD).

AnyMap.cpp

#include <map>
#include <unordered_map>

template<
    template<typename, typename> typename Map,
    typename K,
    typename V
>
class AnyMap {
public:
    template<typename M>
    AnyMap(const M& m) {}

    template<
        template<typename, typename> typename M,
        typename A,
        typename B
    >
    AnyMap(const M<A, B>& m) {}

private:
    Map<K, V> data;
};

template<
    template<typename, typename> typename M,
    typename K,
    typename V
>
AnyMap(const M<K, V>&) -> AnyMap<M, K, V>;

int main()
{
    std::map<int, char*> map;
    std::unordered_map<char, double> um;
    AnyMap m1{map};
    AnyMap m2{um};
}