Line data    Source code

       1             : /*! \file optional.hpp
       2             :     \brief Support for std::optional
       3             :     \ingroup STLSupport */
       4             : /*
       5             :   Copyright (c) 2017, Juan Pedro Bolivar Puente
       6             :   All rights reserved.
       7             : 
       8             :   Redistribution and use in source and binary forms, with or without
       9             :   modification, are permitted provided that the following conditions are met:
      10             :       * Redistributions of source code must retain the above copyright
      11             :         notice, this list of conditions and the following disclaimer.
      12             :       * Redistributions in binary form must reproduce the above copyright
      13             :         notice, this list of conditions and the following disclaimer in the
      14             :         documentation and/or other materials provided with the distribution.
      15             :       * Neither the name of the copyright holder nor the
      16             :         names of its contributors may be used to endorse or promote products
      17             :         derived from this software without specific prior written permission.
      18             : 
      19             :   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
      20             :   ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
      21             :   WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
      22             :   DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY
      23             :   DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
      24             :   (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
      25             :   LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
      26             :   ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
      27             :   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
      28             :   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
      29             : */
      30             : #ifndef CEREAL_TYPES_STD_OPTIONAL_
      31             : #define CEREAL_TYPES_STD_OPTIONAL_
      32             : 
      33             : #include "cereal/cereal.hpp"
      34             : #include <optional>
      35             : 
      36             : namespace cereal {
      37             :   //! Saving for std::optional
      38             :   template <class Archive, typename T> inline
      39          32 :   void CEREAL_SAVE_FUNCTION_NAME(Archive& ar, const std::optional<T>& optional)
      40             :   {
      41          32 :     if(!optional) {
      42          12 :       ar(CEREAL_NVP_("nullopt", true));
      43             :     } else {
      44          20 :       ar(CEREAL_NVP_("nullopt", false),
      45          35 :          CEREAL_NVP_("data", *optional));
      46             :     }
      47          32 :   }
      48             : 
      49             :   //! Loading for std::optional
      50             :   template <class Archive, typename T> inline
      51          32 :   void CEREAL_LOAD_FUNCTION_NAME(Archive& ar, std::optional<T>& optional)
      52             :   {
      53             :     bool nullopt;
      54          32 :     ar(CEREAL_NVP_("nullopt", nullopt));
      55             : 
      56          32 :     if (nullopt) {
      57          12 :       optional = std::nullopt;
      58             :     } else {
      59          20 :       optional.emplace();
      60          20 :       ar(CEREAL_NVP_("data", *optional));
      61             :     }
      62          32 :   }
      63             : } // namespace cereal
      64             : 
      65             : #endif // CEREAL_TYPES_STD_OPTIONAL_