LCOV - code coverage report

Current view: | top level - cereal/types - variant.hpp (source / functions) |  |  | Hit | Total | Coverage
Test: | coverage.info |  | Lines: | 21 | 24 | 87.5 %
Date: | 2022-01-16 21:05:07 |  | Functions: | 36 | 40 | 90.0 %

              Line data    Source code

           1             : /*! \file variant.hpp
           2             :     \brief Support for std::variant
           3             :     \ingroup STLSupport */
           4             : /*
           5             :   Copyright (c) 2014, 2017, Randolph Voorhies, Shane Grant, Juan Pedro
           6             :   Bolivar Puente. 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_VARIANT_HPP_
          31             : #define CEREAL_TYPES_STD_VARIANT_HPP_
          32             :
          33             : #include "cereal/cereal.hpp"
          34             : #include <variant>
          35             : #include <cstdint>
          36             :
          37             : namespace cereal
          38             : {
          39             :   namespace variant_detail
          40             :   {
          41             :     //! @internal
          42             :     template <class Archive>
          43             :     struct variant_save_visitor
          44             :     {
          45          12 :       variant_save_visitor(Archive & ar_) : ar(ar_) {}
          46             :
          47             :       template<class T>
          48          12 :         void operator()(T const & value) const
          49             :         {
          50          12 :           ar( CEREAL_NVP_("data", value) );
          51          12 :         }
          52             :
          53             :       Archive & ar;
          54             :     };
          55             :
          56             :     //! @internal
          57             :     template<int N, class Variant, class Archive>
          58             :     typename std::enable_if<N == std::variant_size_v<Variant>, void>::type
          59           0 :     load_variant(Archive & /*ar*/, int /*target*/, Variant & /*variant*/)
          60             :     {
          61           0 :       throw ::cereal::Exception("Error traversing variant during load");
          62             :     }
          63             :     //! @internal
          64             :     template<int N, class Variant, class Archive>
          65             :     typename std::enable_if<N < std::variant_size_v<Variant>, void>::type
          66          24 :     load_variant(Archive & ar, int target, Variant & variant)
          67             :     {
          68          24 :       if(N == target)
          69             :       {
          70          12 :         variant.template emplace<N>();
          71          12 :         ar( CEREAL_NVP_("data", std::get<N>(variant)) );
          72             :       }
          73             :       else
          74          12 :         load_variant<N+1>(ar, target, variant);
          75          24 :     }
          76             :
          77             :   } // namespace variant_detail
          78             :
          79             :   //! Saving for std::variant
          80             :   template <class Archive, typename VariantType1, typename... VariantTypes> inline
          81          12 :   void CEREAL_SAVE_FUNCTION_NAME( Archive & ar, std::variant<VariantType1, VariantTypes...> const & variant )
          82             :   {
          83          12 :     std::int32_t index = static_cast<std::int32_t>(variant.index());
          84          12 :     ar( CEREAL_NVP_("index", index) );
          85          12 :     variant_detail::variant_save_visitor<Archive> visitor(ar);
          86          12 :     std::visit(visitor, variant);
          87          12 :   }
          88             :
          89             :   //! Loading for std::variant
          90             :   template <class Archive, typename... VariantTypes> inline
          91          12 :   void CEREAL_LOAD_FUNCTION_NAME( Archive & ar, std::variant<VariantTypes...> & variant )
          92             :   {
          93             :     using variant_t = typename std::variant<VariantTypes...>;
          94             :
          95             :     std::int32_t index;
          96          12 :     ar( CEREAL_NVP_("index", index) );
          97          12 :     if(index >= static_cast<std::int32_t>(std::variant_size_v<variant_t>))
          98           0 :       throw Exception("Invalid 'index' selector when deserializing std::variant");
          99             :
         100          12 :     variant_detail::load_variant<0>(ar, index, variant);
         101          12 :   }
         102             :
         103             :   //! Serializing a std::monostate
         104             :   template <class Archive>
         105             :   void CEREAL_SERIALIZE_FUNCTION_NAME( Archive &, std::monostate const & ) {}
         106             : } // namespace cereal
         107             :
         108             : #endif // CEREAL_TYPES_STD_VARIANT_HPP_

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