register_any_stringer.h

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#pragma once
#include "unregister_any_stringer.h"

extern std::unordered_map<std::type_index, std::function<std::string(std::any const&)>> __any_stringer__;

template<class type_t, class function_t>
inline std::pair<const std::type_index, std::function<std::string(std::any const&)>> __to_any_stringer__(function_t const& func) {
  return {
    std::type_index(typeid(type_t)),
    [f = func](std::any const & value)->std::string {
      if constexpr(std::is_void_v<type_t>) return f();
      else return f(std::any_cast<const type_t&>(value));
    }
  };
}

namespace xtd {
  template<class type_t, class function_t>
  inline void register_any_stringer(const function_t& func) {
    unregister_any_stringer<type_t>();
    __any_stringer__.insert(__to_any_stringer__<type_t>(func));
  }
}