[C++ Template] Calculate hash by type name

[C++ Template] Calculate hash by type name.hpp

#pragma once

template <typename T>
constexpr size_t hash_type()
{
    size_t result{};
    #ifdef _MSC_VER 
      #define F __FUNCSIG__
    #else
      #define F __PRETTY_FUNCTION__
    #endif
    for (const auto &c : F)
        (result ^= c) <<= 1;
    return result;
};

template<typename ...Args>
constexpr size_t hash_types() {
  size_t result{};
  constexpr size_t size = sizeof...(Args);
  constexpr size_t hash[size] = { hash_type<Args>() ... };
  for (const auto &c : hash) (result ^= c) <<= 1;
  return result;
};

template<>
constexpr size_t hash_types() { return hash_type<void>(); }