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       1             : /*! \file tuple.hpp
       2             :     \brief Support for types found in \<tuple\>
       3             :     \ingroup STLSupport */
       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 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_TUPLE_HPP_
      31             : #define CEREAL_TYPES_TUPLE_HPP_
      32             : 
      33             : #include "cereal/cereal.hpp"
      34             : #include <tuple>
      35             : 
      36             : namespace cereal
      37             : {
      38             :   namespace tuple_detail
      39             :   {
      40             :     //! Creates a c string from a sequence of characters
      41             :     /*! The c string created will always be prefixed by "tuple_element"
      42             :         Based on code from: http://stackoverflow/a/20973438/710791
      43             :         @internal */
      44             :     template<char...Cs>
      45             :     struct char_seq_to_c_str
      46             :     {
      47             :       static const int size = 14;// Size of array for the word: tuple_element
      48             :       typedef const char (&arr_type)[sizeof...(Cs) + size];
      49             :       static const char str[sizeof...(Cs) + size];
      50             :     };
      51             : 
      52             :     // the word tuple_element plus a number
      53             :     //! @internal
      54             :     template<char...Cs>
      55             :     const char char_seq_to_c_str<Cs...>::str[sizeof...(Cs) + size] =
      56             :       {'t','u','p','l','e','_','e','l','e','m','e','n','t', Cs..., '\0'};
      57             : 
      58             :     //! Converts a number into a sequence of characters
      59             :     /*! @tparam Q The quotient of dividing the original number by 10
      60             :         @tparam R The remainder of dividing the original number by 10
      61             :         @tparam C The sequence built so far
      62             :         @internal */
      63             :     template <size_t Q, size_t R, char ... C>
      64             :     struct to_string_impl
      65             :     {
      66             :       using type = typename to_string_impl<Q/10, Q%10, static_cast<char>(R+std::size_t{'0'}), C...>::type;
      67             :     };
      68             : 
      69             :     //! Base case with no quotient
      70             :     /*! @internal */
      71             :     template <size_t R, char ... C>
      72             :     struct to_string_impl<0, R, C...>
      73             :     {
      74             :       using type = char_seq_to_c_str<static_cast<char>(R+std::size_t{'0'}), C...>;
      75             :     };
      76             : 
      77             :     //! Generates a c string for a given index of a tuple
      78             :     /*! Example use:
      79             :         @code{cpp}
      80             :         tuple_element_name<3>::c_str();// returns "tuple_element3"
      81             :         @endcode
      82             :         @internal */
      83             :     template<size_t T>
      84             :     struct tuple_element_name
      85             :     {
      86             :       using type = typename to_string_impl<T/10, T%10>::type;
      87       24800 :       static const typename type::arr_type c_str(){ return type::str; }
      88             :     };
      89             : 
      90             :     // unwinds a tuple to save it
      91             :     //! @internal
      92             :     template <size_t Height>
      93             :     struct serialize
      94             :     {
      95             :       template <class Archive, class ... Types> inline
      96       24800 :       static void apply( Archive & ar, std::tuple<Types...> & tuple )
      97             :       {
      98       24800 :         serialize<Height - 1>::template apply( ar, tuple );
      99       24800 :         ar( CEREAL_NVP_(tuple_element_name<Height - 1>::c_str(),
     100             :             std::get<Height - 1>( tuple )) );
     101       24800 :       }
     102             :     };
     103             : 
     104             :     // Zero height specialization - nothing to do here
     105             :     //! @internal
     106             :     template <>
     107             :     struct serialize<0>
     108             :     {
     109             :       template <class Archive, class ... Types> inline
     110        4800 :       static void apply( Archive &, std::tuple<Types...> & )
     111        4800 :       { }
     112             :     };
     113             :   }
     114             : 
     115             :   //! Serializing for std::tuple
     116             :   template <class Archive, class ... Types> inline
     117        4800 :   void CEREAL_SERIALIZE_FUNCTION_NAME( Archive & ar, std::tuple<Types...> & tuple )
     118             :   {
     119        4800 :     tuple_detail::serialize<std::tuple_size<std::tuple<Types...>>::value>::template apply( ar, tuple );
     120        4800 :   }
     121             : } // namespace cereal
     122             : 
     123             : #endif // CEREAL_TYPES_TUPLE_HPP_