LCOV - code coverage report
Current view: top level - cereal/types - boost_variant.hpp (source / functions) Hit Total Coverage
Test: coverage.info Lines: 22 25 88.0 %
Date: 2017-02-12 13:57:59 Functions: 36 40 90.0 %

          Line data    Source code
       1             : /*! \file boost_variant.hpp
       2             :     \brief Support for boost::variant
       3             :     \ingroup OtherTypes */
       4             : /*
       5             :   Copyright (c) 2014, Randolph Voorhies, Shane Grant
       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 cereal 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 RANDOLPH VOORHIES OR SHANE GRANT 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_BOOST_VARIANT_HPP_
      31             : #define CEREAL_TYPES_BOOST_VARIANT_HPP_
      32             : 
      33             : #include "cereal/cereal.hpp"
      34             : #include <boost/variant.hpp>
      35             : #include <boost/mpl/size.hpp>
      36             : 
      37             : namespace cereal
      38             : {
      39             :   namespace variant_detail
      40             :   {
      41             :     //! @internal
      42             :     template <class Archive>
      43             :     struct variant_save_visitor : boost::static_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 ... Args, class Archive>
      58             :     typename std::enable_if<N == boost::mpl::size<typename Variant::types>::value, 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             : 
      64             :     //! @internal
      65             :     template<int N, class Variant, class H, class ... T, class Archive>
      66             :     typename std::enable_if<N < boost::mpl::size<typename Variant::types>::value, void>::type
      67          24 :     load_variant(Archive & ar, int target, Variant & variant)
      68             :     {
      69          24 :       if(N == target)
      70             :       {
      71           8 :         H value;
      72          12 :         ar( CEREAL_NVP_("data", value) );
      73          12 :         variant = value;
      74             :       }
      75             :       else
      76          12 :         load_variant<N+1, Variant, T...>(ar, target, variant);
      77          24 :     }
      78             : 
      79             :   } // namespace variant_detail
      80             : 
      81             :   //! Saving for boost::variant
      82             :   template <class Archive, typename VariantType1, typename... VariantTypes> inline
      83          12 :   void CEREAL_SAVE_FUNCTION_NAME( Archive & ar, boost::variant<VariantType1, VariantTypes...> const & variant )
      84             :   {
      85          12 :     int32_t which = variant.which();
      86          12 :     ar( CEREAL_NVP_("which", which) );
      87          12 :     variant_detail::variant_save_visitor<Archive> visitor(ar);
      88          12 :     variant.apply_visitor(visitor);
      89          12 :   }
      90             : 
      91             :   //! Loading for boost::variant
      92             :   template <class Archive, typename VariantType1, typename... VariantTypes> inline
      93          12 :   void CEREAL_LOAD_FUNCTION_NAME( Archive & ar, boost::variant<VariantType1, VariantTypes...> & variant )
      94             :   {
      95             :     typedef typename boost::variant<VariantType1, VariantTypes...>::types types;
      96             : 
      97             :     int32_t which;
      98          12 :     ar( CEREAL_NVP_("which", which) );
      99          12 :     if(which >= boost::mpl::size<types>::value)
     100           0 :       throw Exception("Invalid 'which' selector when deserializing boost::variant");
     101             : 
     102          12 :     variant_detail::load_variant<0, boost::variant<VariantType1, VariantTypes...>, VariantType1, VariantTypes...>(ar, which, variant);
     103          12 :   }
     104             : } // namespace cereal
     105             : 
     106             : #endif // CEREAL_TYPES_BOOST_VARIANT_HPP_

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