register_any_stringer.hpp

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#pragma once
#include "collections/generic/key_value_pair.hpp"
#include "unregister_any_stringer.hpp"

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

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

}