__iformatable_formatter.hpp

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#pragma once
#if !defined(__XTD_CORE_INTERNAL__)
#error "Do not include this file: Internal use only"
#endif
 
#include "../helpers/throw_helper.hpp"
#include "../iformatable.hpp"
#include "../istringable.hpp"
#include <type_traits>

namespace xtd {
  class object;
}
 
[[nodiscard]] auto __to_string_iformatable_to_string(const xtd::iformatable* obj, const std::string& fmt, const std::locale& loc) -> std::string;
template<class type_t>
[[nodiscard]] auto __to_string_istringable_to_string(const xtd::istringable<type_t>* obj) -> std::string;
[[nodiscard]] auto __to_string_object_to_string(const xtd::object* obj) -> std::string;
 
template<class value_t>
[[nodiscard]] inline static auto __to_string_polymorphic(const value_t& value, const std::string& fmt, const std::locale& loc) -> std::string {
  if constexpr(std::derived_from<std::remove_cvref_t<value_t>, xtd::iformatable>) return __to_string_iformatable_to_string(static_cast<const xtd::iformatable*>(&value), fmt, loc);
  else if constexpr(std::derived_from<std::remove_cvref_t<value_t>, xtd::istringable<std::remove_cvref_t<value_t>>>) return __to_string_istringable_to_string(static_cast<const xtd::istringable<value_t>*>(&value));
  else if constexpr(std::derived_from<std::remove_cvref_t<value_t>, xtd::object>) return __to_string_object_to_string(static_cast<const xtd::object*>(&value));
  else if constexpr(std::derived_from<std::remove_cvref_t<value_t>, std::exception>) return std::string {"exception: "} + static_cast<const std::exception&>(value).what();
  else xtd::helpers::throw_helper::throws(xtd::helpers::exception_case::format_not_iformatable, typeid(value));
}