C++: Convert Unicode String to ANSI String

I've seen so many examples and questions of how to convert between unicode string and ANSI string using C++. So here is by far the easiest way to do this conversion that I've implemented:

template <typename Facet>

struct TFacet : Facet

{

    using Facet::Facet;

};

wstring stringtowstring(string value)

{

    std::wstring_convert<TFacet<std::codecvt<wchar_t, char, std::mbstate_t>>> conv;

    return conv.from_bytes(value);

}

string wstringtostring(wstring value)

{

    std::wstring_convert<TFacet<std::codecvt<wchar_t, char, std::mbstate_t>>> conv;

    return conv.to_bytes(value);

}