any.h

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#pragma once
#include <any>
#include <functional>
#include <string>
#include <typeindex>
#include <typeinfo>
#include <type_traits>
#include <unordered_map>
#include <vector>
 
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) {
    __any_stringer__.insert(__to_any_stringer__<type_t>(func));
  }
}