src/core/format.hpp

   1 /*
   2  * This file is part of OpenTTD.
   3  * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
   4  * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
   5  * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
   6  */
   7
   8 /** @file format.hpp String formatting functions and helpers. */
   9
  10 #ifndef FORMAT_HPP
  11 #define FORMAT_HPP
  12
  13 #include "../3rdparty/fmt/format.h"
  14 #include "strong_typedef_type.hpp"
  15
  16 template <typename E, typename Char>
  17 struct fmt::formatter<E, Char, std::enable_if_t<std::is_enum<E>::value>> : fmt::formatter<typename std::underlying_type<E>::type> {
  18         using underlying_type = typename std::underlying_type<E>::type;
  19         using parent = typename fmt::formatter<underlying_type>;
  20
  21         constexpr fmt::format_parse_context::iterator parse(fmt::format_parse_context &ctx)
  22         {
  23                 return parent::parse(ctx);
  24         }
  25
  26         fmt::format_context::iterator format(const E &e, format_context &ctx) const
  27         {
  28                 return parent::format(underlying_type(e), ctx);
  29         }
  30 };
  31
  32 template <typename T, typename Char>
  33 struct fmt::formatter<T, Char, std::enable_if_t<std::is_base_of<StrongTypedefBase, T>::value>> : fmt::formatter<typename T::BaseType> {
  34         using underlying_type = typename T::BaseType;
  35         using parent = typename fmt::formatter<underlying_type>;
  36
  37         constexpr fmt::format_parse_context::iterator parse(fmt::format_parse_context &ctx)
  38         {
  39                 return parent::parse(ctx);
  40         }
  41
  42         fmt::format_context::iterator format(const T &t, format_context &ctx) const
  43         {
  44                 return parent::format(t.base(), ctx);
  45         }
  46 };
  47
  48 #endif /* FORMAT_HPP */