blame: source/code/Libs/include/cereal/details/traits.hpp

/*! \file traits.hpp

    \brief Internal type trait support

    \ingroup Internal */

/*

  Copyright (c) 2014, Randolph Voorhies, Shane Grant

  All rights reserved.

  Redistribution and use in source and binary forms, with or without

  modification, are permitted provided that the following conditions are met:

      * Redistributions of source code must retain the above copyright

        notice, this list of conditions and the following disclaimer.

      * Redistributions in binary form must reproduce the above copyright

        notice, this list of conditions and the following disclaimer in the

        documentation and/or other materials provided with the distribution.

      * Neither the name of cereal nor the

        names of its contributors may be used to endorse or promote products

        derived from this software without specific prior written permission.

  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND

  ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE

  DISCLAIMED. IN NO EVENT SHALL RANDOLPH VOORHIES OR SHANE GRANT BE LIABLE FOR ANY

  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES

  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;

  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND

  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS

  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

*/

#ifndef CEREAL_DETAILS_TRAITS_HPP_

#define CEREAL_DETAILS_TRAITS_HPP_

#ifndef __clang__

#if (__GNUC__ == 4 && __GNUC_MINOR__ <= 7)

#define CEREAL_OLDER_GCC

#endif // gcc 4.7 or earlier

#endif // __clang__

#include <type_traits>

#include <typeindex>

#include <cereal/macros.hpp>

#include <cereal/access.hpp>

namespace cereal

{

  namespace traits

  {

    using yes = std::true_type;

    using no  = std::false_type;

    namespace detail

    {

      // ######################################################################

      //! Used to delay a static_assert until template instantiation

      template <class T>

      struct delay_static_assert : std::false_type {};

      // ######################################################################

      // SFINAE Helpers

      #ifdef CEREAL_OLDER_GCC // when VS supports better SFINAE, we can use this as the default

      template<typename> struct Void { typedef void type; };

      #endif // CEREAL_OLDER_GCC

      //! Return type for SFINAE Enablers

      enum class sfinae {};

      // ######################################################################

      // Helper functionality for boolean integral constants and Enable/DisableIf

      template <bool H, bool ... T> struct meta_bool_and : std::integral_constant<bool, H && meta_bool_and<T...>::value> {};

      template <bool B> struct meta_bool_and<B> : std::integral_constant<bool, B> {};

      template <bool H, bool ... T> struct meta_bool_or : std::integral_constant<bool, H || meta_bool_or<T...>::value> {};

      template <bool B> struct meta_bool_or<B> : std::integral_constant<bool, B> {};

      // workaround needed due to bug in MSVC 2013, see

      // http://connect.microsoft.com/VisualStudio/feedback/details/800231/c-11-alias-template-issue

      template <bool ... Conditions>

      struct EnableIfHelper : std::enable_if<meta_bool_and<Conditions...>::value, sfinae> {};

      template <bool ... Conditions>

      struct DisableIfHelper : std::enable_if<!meta_bool_or<Conditions...>::value, sfinae> {};

    } // namespace detail

    //! Used as the default value for EnableIf and DisableIf template parameters

    /*! @relates EnableIf

        @relates DisableIf */

    static const detail::sfinae sfinae = {};

    // ######################################################################

    //! Provides a way to enable a function if conditions are met

    /*! This is intended to be used in a near identical fashion to std::enable_if

        while being significantly easier to read at the cost of not allowing for as

        complicated of a condition.

        This will compile (allow the function) if every condition evaluates to true.

        at compile time.  This should be used with SFINAE to ensure that at least

        one other candidate function works when one fails due to an EnableIf.

        This should be used as the las template parameter to a function as

        an unnamed parameter with a default value of cereal::traits::sfinae:

        @code{cpp}

        // using by making the last template argument variadic

        template <class T, EnableIf<std::is_same<T, bool>::value> = sfinae>

        void func(T t );

        @endcode

        Note that this performs a logical AND of all conditions, so you will need

        to construct more complicated requirements with this fact in mind.

        @relates DisableIf

        @relates sfinae

        @tparam Conditions The conditions which will be logically ANDed to enable the function. */

    template <bool ... Conditions>

    using EnableIf = typename detail::EnableIfHelper<Conditions...>::type;

    // ######################################################################

    //! Provides a way to disable a function if conditions are met

    /*! This is intended to be used in a near identical fashion to std::enable_if

        while being significantly easier to read at the cost of not allowing for as

        complicated of a condition.

        This will compile (allow the function) if every condition evaluates to false.

        This should be used with SFINAE to ensure that at least one other candidate

        function works when one fails due to a DisableIf.

        This should be used as the las template parameter to a function as

        an unnamed parameter with a default value of cereal::traits::sfinae:

        @code{cpp}

        // using by making the last template argument variadic

        template <class T, DisableIf<std::is_same<T, bool>::value> = sfinae>

        void func(T t );

        @endcode

        This is often used in conjunction with EnableIf to form an enable/disable pair of

        overloads.

        Note that this performs a logical AND of all conditions, so you will need

        to construct more complicated requirements with this fact in mind.  If all conditions

        hold, the function will be disabled.

        @relates EnableIf

        @relates sfinae

        @tparam Conditions The conditions which will be logically ANDed to disable the function. */

    template <bool ... Conditions>

    using DisableIf = typename detail::DisableIfHelper<Conditions...>::type;

    // ######################################################################

    namespace detail

    {

      template <class InputArchive>

      struct get_output_from_input : no

      {

        static_assert( detail::delay_static_assert<InputArchive>::value,

            "Could not find an associated output archive for input archive." );

      };

      template <class OutputArchive>

      struct get_input_from_output : no

      {

        static_assert( detail::delay_static_assert<OutputArchive>::value,

            "Could not find an associated input archive for output archive." );

      };

    }

    //! Sets up traits that relate an input archive to an output archive

    #define CEREAL_SETUP_ARCHIVE_TRAITS(InputArchive, OutputArchive)  \

    namespace cereal { namespace traits { namespace detail {          \

      template <> struct get_output_from_input<InputArchive>          \

      { using type = OutputArchive; };                                \

      template <> struct get_input_from_output<OutputArchive>         \

      { using type = InputArchive; }; } } } /* end namespaces */

    // ######################################################################

    //! Used to convert a MAKE_HAS_XXX macro into a versioned variant

    #define CEREAL_MAKE_VERSIONED_TEST ,0

    // ######################################################################

    //! Creates a test for whether a non const member function exists

    /*! This creates a class derived from std::integral_constant that will be true if

        the type has the proper member function for the given archive.

        @param name The name of the function to test for (e.g. serialize, load, save)

        @param test_name The name to give the test for the function being tested for (e.g. serialize, versioned_serialize)

        @param versioned Either blank or the macro CEREAL_MAKE_VERSIONED_TEST */

    #ifdef CEREAL_OLDER_GCC

    #define CEREAL_MAKE_HAS_MEMBER_TEST(name, test_name, versioned)                                                                         \

    template <class T, class A, class SFINAE = void>                                                                                        \

    struct has_member_##test_name : no {};                                                                                                  \

    template <class T, class A>                                                                                                             \

    struct has_member_##test_name<T, A,                                                                                                     \

      typename detail::Void< decltype( cereal::access::member_##name( std::declval<A&>(), std::declval<T&>() versioned ) ) >::type> : yes {}

    #else // NOT CEREAL_OLDER_GCC

    #define CEREAL_MAKE_HAS_MEMBER_TEST(name, test_name, versioned)                                                                     \

    namespace detail                                                                                                                    \

    {                                                                                                                                   \

      template <class T, class A>                                                                                                       \

      struct has_member_##name##_##versioned##_impl                                                                                     \

      {                                                                                                                                 \

        template <class TT, class AA>                                                                                                   \

        static auto test(int) -> decltype( cereal::access::member_##name( std::declval<AA&>(), std::declval<TT&>() versioned ), yes()); \

        template <class, class>                                                                                                         \

        static no test(...);                                                                                                            \

        static const bool value = std::is_same<decltype(test<T, A>(0)), yes>::value;                                                    \

      };                                                                                                                                \

    } /* end namespace detail */                                                                                                        \

    template <class T, class A>                                                                                                         \

    struct has_member_##test_name : std::integral_constant<bool, detail::has_member_##name##_##versioned##_impl<T, A>::value> {}

    #endif // NOT CEREAL_OLDER_GCC

    // ######################################################################

    //! Creates a test for whether a non const non-member function exists

    /*! This creates a class derived from std::integral_constant that will be true if

        the type has the proper non-member function for the given archive. */

    #define CEREAL_MAKE_HAS_NON_MEMBER_TEST(test_name, func, versioned)                                                         \

    namespace detail                                                                                                            \

    {                                                                                                                           \

      template <class T, class A>                                                                                               \

      struct has_non_member_##test_name##_impl                                                                                  \

      {                                                                                                                         \

        template <class TT, class AA>                                                                                           \

        static auto test(int) -> decltype( func( std::declval<AA&>(), std::declval<TT&>() versioned ), yes());                  \

        template <class, class>                                                                                                 \

        static no test( ... );                                                                                                  \

        static const bool value = std::is_same<decltype( test<T, A>( 0 ) ), yes>::value;                                        \

      };                                                                                                                        \

    } /* end namespace detail */                                                                                                \

    template <class T, class A>                                                                                                 \

    struct has_non_member_##test_name : std::integral_constant<bool, detail::has_non_member_##test_name##_impl<T, A>::value> {}

    // ######################################################################

    // Member Serialize

    CEREAL_MAKE_HAS_MEMBER_TEST(serialize, serialize,);

    // ######################################################################

    // Member Serialize (versioned)

    CEREAL_MAKE_HAS_MEMBER_TEST(serialize, versioned_serialize, CEREAL_MAKE_VERSIONED_TEST);

    // ######################################################################

    // Non Member Serialize

    CEREAL_MAKE_HAS_NON_MEMBER_TEST(serialize, CEREAL_SERIALIZE_FUNCTION_NAME,);

    // ######################################################################

    // Non Member Serialize (versioned)

    CEREAL_MAKE_HAS_NON_MEMBER_TEST(versioned_serialize, CEREAL_SERIALIZE_FUNCTION_NAME, CEREAL_MAKE_VERSIONED_TEST);

    // ######################################################################

    // Member Load

    CEREAL_MAKE_HAS_MEMBER_TEST(load, load,);

    // ######################################################################

    // Member Load (versioned)

    CEREAL_MAKE_HAS_MEMBER_TEST(load, versioned_load, CEREAL_MAKE_VERSIONED_TEST);

    // ######################################################################

    // Non Member Load

    CEREAL_MAKE_HAS_NON_MEMBER_TEST(load, CEREAL_LOAD_FUNCTION_NAME,);

    // ######################################################################

    // Non Member Load (versioned)

    CEREAL_MAKE_HAS_NON_MEMBER_TEST(versioned_load, CEREAL_LOAD_FUNCTION_NAME, CEREAL_MAKE_VERSIONED_TEST);

    // ######################################################################

    #undef CEREAL_MAKE_HAS_NON_MEMBER_TEST

    #undef CEREAL_MAKE_HAS_MEMBER_TEST

    // ######################################################################

    //! Creates a test for whether a member save function exists

    /*! This creates a class derived from std::integral_constant that will be true if

        the type has the proper member function for the given archive.

        @param test_name The name to give the test (e.g. save or versioned_save)

        @param versioned Either blank or the macro CEREAL_MAKE_VERSIONED_TEST */

    #ifdef CEREAL_OLDER_GCC

    #define CEREAL_MAKE_HAS_MEMBER_SAVE_IMPL(test_name, versioned)                                                                  \

    namespace detail                                                                                                                \

    {                                                                                                                               \

    template <class T, class A>                                                                                                     \

    struct has_member_##test_name##_impl                                                                                            \

      {                                                                                                                             \

        template <class TT, class AA, class SFINAE = void> struct test : no {};                                                     \

        template <class TT, class AA>                                                                                               \

        struct test<TT, AA,                                                                                                         \

          typename detail::Void< decltype( cereal::access::member_save( std::declval<AA&>(),                                        \

                                                                        std::declval<TT const &>() versioned ) ) >::type> : yes {}; \

        static const bool value = test<T, A>();                                                                                     \

                                                                                                                                    \

        template <class TT, class AA, class SFINAE = void> struct test2 : no {};                                                    \

        template <class TT, class AA>                                                                                               \

        struct test2<TT, AA,                                                                                                        \

          typename detail::Void< decltype( cereal::access::member_save_non_const(                                                   \

                                            std::declval<AA&>(),                                                                    \

                                            std::declval<typename std::remove_const<TT>::type&>() versioned ) ) >::type> : yes {};  \

        static const bool not_const_type = test2<T, A>();                                                                           \

      };                                                                                                                            \

    } /* end namespace detail */

    #else /* NOT CEREAL_OLDER_GCC =================================== */

    #define CEREAL_MAKE_HAS_MEMBER_SAVE_IMPL(test_name, versioned)                                                                  \

    namespace detail                                                                                                                \

    {                                                                                                                               \

    template <class T, class A>                                                                                                     \

    struct has_member_##test_name##_impl                                                                                            \

      {                                                                                                                             \

        template <class TT, class AA>                                                                                               \

        static auto test(int) -> decltype( cereal::access::member_save( std::declval<AA&>(),                                        \

                                                                        std::declval<TT const &>() versioned ), yes());             \

        template <class, class> static no test(...);                                                                                \

        static const bool value = std::is_same<decltype(test<T, A>(0)), yes>::value;                                                \

                                                                                                                                    \

        template <class TT, class AA>                                                                                               \

        static auto test2(int) -> decltype( cereal::access::member_save_non_const(                                                  \

                                              std::declval<AA &>(),                                                                 \

                                              std::declval<typename std::remove_const<TT>::type&>() versioned ), yes());            \

        template <class, class> static no test2(...);                                                                               \

        static const bool not_const_type = std::is_same<decltype(test2<T, A>(0)), yes>::value;                                      \

      };                                                                                                                            \

    } /* end namespace detail */

    #endif /* NOT CEREAL_OLDER_GCC */

    // ######################################################################

    // Member Save

    CEREAL_MAKE_HAS_MEMBER_SAVE_IMPL(save, )

    template <class T, class A>

    struct has_member_save : std::integral_constant<bool, detail::has_member_save_impl<T, A>::value>

    {

      typedef typename detail::has_member_save_impl<T, A> check;

      static_assert( check::value || !check::not_const_type,

        "cereal detected a non-const save. \n "

        "save member functions must always be const" );

    };

    // ######################################################################

    // Member Save (versioned)

    CEREAL_MAKE_HAS_MEMBER_SAVE_IMPL(versioned_save, CEREAL_MAKE_VERSIONED_TEST)

    template <class T, class A>

    struct has_member_versioned_save : std::integral_constant<bool, detail::has_member_versioned_save_impl<T, A>::value>

    {

      typedef typename detail::has_member_versioned_save_impl<T, A> check;

      static_assert( check::value || !check::not_const_type,

        "cereal detected a versioned non-const save. \n "

        "save member functions must always be const" );

    };

    // ######################################################################

    #undef CEREAL_MAKE_HAS_MEMBER_SAVE_IMPL

    // ######################################################################

    //! Creates a test for whether a non-member save function exists

    /*! This creates a class derived from std::integral_constant that will be true if

        the type has the proper non-member function for the given archive.

        @param test_name The name to give the test (e.g. save or versioned_save)

        @param versioned Either blank or the macro CEREAL_MAKE_VERSIONED_TEST */

    #define CEREAL_MAKE_HAS_NON_MEMBER_SAVE_TEST(test_name, versioned)                                                       \

    namespace detail                                                                                                         \

    {                                                                                                                        \

      template <class T, class A>                                                                                            \

      struct has_non_member_##test_name##_impl                                                                               \

      {                                                                                                                      \

        template <class TT, class AA>                                                                                        \

        static auto test(int) -> decltype( CEREAL_SAVE_FUNCTION_NAME(                                                        \

                                              std::declval<AA&>(),                                                           \

                                              std::declval<TT const &>() versioned ), yes());                                \

        template <class, class> static no test(...);                                                                         \

        static const bool value = std::is_same<decltype(test<T, A>(0)), yes>::value;                                         \

                                                                                                                             \

        template <class TT, class AA>                                                                                        \

        static auto test2(int) -> decltype( CEREAL_SAVE_FUNCTION_NAME(                                                       \

                                              std::declval<AA &>(),                                                          \

                                              std::declval<typename std::remove_const<TT>::type&>() versioned ), yes());     \

        template <class, class> static no test2(...);                                                                        \

        static const bool not_const_type = std::is_same<decltype(test2<T, A>(0)), yes>::value;                               \

      };                                                                                                                     \

    } /* end namespace detail */                                                                                             \

                                                                                                                             \

    template <class T, class A>                                                                                              \

    struct has_non_member_##test_name : std::integral_constant<bool, detail::has_non_member_##test_name##_impl<T, A>::value> \

    {                                                                                                                        \

      using check = typename detail::has_non_member_##test_name##_impl<T, A>;                                                \

      static_assert( check::value || !check::not_const_type,                                                                 \

        "cereal detected a non-const type parameter in non-member " #test_name ". \n "                                       \

        #test_name " non-member functions must always pass their types as const" );                                          \

    };

    // ######################################################################

    // Non Member Save

    CEREAL_MAKE_HAS_NON_MEMBER_SAVE_TEST(save, )

    // ######################################################################

    // Non Member Save (versioned)

    CEREAL_MAKE_HAS_NON_MEMBER_SAVE_TEST(versioned_save, CEREAL_MAKE_VERSIONED_TEST)

    // ######################################################################

    #undef CEREAL_MAKE_HAS_NON_MEMBER_SAVE_TEST

    // ######################################################################

    // Minimal Utilities

    namespace detail

    {

      // Determines if the provided type is an std::string

      template <class> struct is_string : std::false_type {};

      template <class CharT, class Traits, class Alloc>

      struct is_string<std::basic_string<CharT, Traits, Alloc>> : std::true_type {};

    }

    // Determines if the type is valid for use with a minimal serialize function

    template <class T>

    struct is_minimal_type : std::integral_constant<bool,

      detail::is_string<T>::value || std::is_arithmetic<T>::value> {};

    // ######################################################################

    //! Creates implementation details for whether a member save_minimal function exists

    /*! This creates a class derived from std::integral_constant that will be true if

        the type has the proper member function for the given archive.

        @param test_name The name to give the test (e.g. save_minimal or versioned_save_minimal)

        @param versioned Either blank or the macro CEREAL_MAKE_VERSIONED_TEST */

    #ifdef CEREAL_OLDER_GCC

    #define CEREAL_MAKE_HAS_MEMBER_SAVE_MINIMAL_IMPL(test_name, versioned)                                                                        \

    namespace detail                                                                                                                              \

    {                                                                                                                                             \

      template <class T, class A>                                                                                                                 \

      struct has_member_##test_name##_impl                                                                                                        \

      {                                                                                                                                           \

        template <class TT, class AA, class SFINAE = void> struct test : no {};                                                                   \

        template <class TT, class AA>                                                                                                             \

        struct test<TT, AA, typename detail::Void< decltype(                                                                                      \

            cereal::access::member_save_minimal( std::declval<AA const &>(),                                                                      \

                                                 std::declval<TT const &>() versioned ) ) >::type> : yes {};                                      \

                                                                                                                                                  \

        static const bool value = test<T, A>();                                                                                                   \

                                                                                                                                                  \

        template <class TT, class AA, class SFINAE = void> struct test2 : no {};                                                                  \

        template <class TT, class AA>                                                                                                             \

        struct test2<TT, AA, typename detail::Void< decltype(                                                                                     \

            cereal::access::member_save_minimal_non_const( std::declval<AA const &>(),                                                            \

                                                           std::declval<typename std::remove_const<TT>::type&>() versioned ) ) >::type> : yes {}; \

        static const bool not_const_type = test2<T, A>();                                                                                         \

                                                                                                                                                  \

        static const bool valid = value || !not_const_type;                                                                                       \

      };                                                                                                                                          \

    } /* end namespace detail */

    #else /* NOT CEREAL_OLDER_GCC =================================== */

    #define CEREAL_MAKE_HAS_MEMBER_SAVE_MINIMAL_IMPL(test_name, versioned)                     \

    namespace detail                                                                           \

    {                                                                                          \

      template <class T, class A>                                                              \

      struct has_member_##test_name##_impl                                                     \

      {                                                                                        \

        template <class TT, class AA>                                                          \

        static auto test(int) -> decltype( cereal::access::member_save_minimal(                \

              std::declval<AA const &>(),                                                      \

              std::declval<TT const &>() versioned ), yes());                                  \

        template <class, class> static no test(...);                                           \

        static const bool value = std::is_same<decltype(test<T, A>(0)), yes>::value;           \

                                                                                               \

        template <class TT, class AA>                                                          \

        static auto test2(int) -> decltype( cereal::access::member_save_minimal_non_const(     \

              std::declval<AA const &>(),                                                      \

              std::declval<typename std::remove_const<TT>::type&>() versioned ), yes());       \

        template <class, class> static no test2(...);                                          \

        static const bool not_const_type = std::is_same<decltype(test2<T, A>(0)), yes>::value; \

                                                                                               \

        static const bool valid = value || !not_const_type;                                    \

      };                                                                                       \

    } /* end namespace detail */

    #endif // NOT CEREAL_OLDER_GCC

    // ######################################################################

    //! Creates helpers for minimal save functions

    /*! The get_member_*_type structs allow access to the return type of a save_minimal,

        assuming that the function actually exists.  If the function does not

        exist, the type will be void.

        @param test_name The name to give the test (e.g. save_minimal or versioned_save_minimal)

        @param versioned Either blank or the macro CEREAL_MAKE_VERSIONED_TEST */

    #define CEREAL_MAKE_HAS_MEMBER_SAVE_MINIMAL_HELPERS_IMPL(test_name, versioned)                           \

    namespace detail                                                                                         \

    {                                                                                                        \

      template <class T, class A, bool Valid>                                                                \

      struct get_member_##test_name##_type { using type = void; };                                           \

                                                                                                             \

      template <class T, class A>                                                                            \

      struct get_member_##test_name##_type<T, A, true>                                                       \

      {                                                                                                      \

        using type = decltype( cereal::access::member_save_minimal( std::declval<A const &>(),               \

                                                                    std::declval<T const &>() versioned ) ); \

      };                                                                                                     \

    } /* end namespace detail */

    // ######################################################################

    //! Creates a test for whether a member save_minimal function exists

    /*! This creates a class derived from std::integral_constant that will be true if

        the type has the proper member function for the given archive.

        @param test_name The name to give the test (e.g. save_minimal or versioned_save_minimal) */

    #define CEREAL_MAKE_HAS_MEMBER_SAVE_MINIMAL_TEST(test_name)                                                      \

    template <class T, class A>                                                                                      \

    struct has_member_##test_name : std::integral_constant<bool, detail::has_member_##test_name##_impl<T, A>::value> \

    {                                                                                                                \

      using check = typename detail::has_member_##test_name##_impl<T, A>;                                            \

      static_assert( check::valid,                                                                                   \

        "cereal detected a non-const member " #test_name ". \n "                                                     \

        #test_name " member functions must always be const" );                                                       \

                                                                                                                     \

      using type = typename detail::get_member_##test_name##_type<T, A, check::value>::type;                         \

      static_assert( (check::value && is_minimal_type<type>::value) || !check::value,                                \

        "cereal detected a member " #test_name " with an invalid return type. \n "                                   \

        "return type must be arithmetic or string" );                                                                \

    };

    // ######################################################################

    // Member Save Minimal

    CEREAL_MAKE_HAS_MEMBER_SAVE_MINIMAL_IMPL(save_minimal, )

    CEREAL_MAKE_HAS_MEMBER_SAVE_MINIMAL_HELPERS_IMPL(save_minimal, )

    CEREAL_MAKE_HAS_MEMBER_SAVE_MINIMAL_TEST(save_minimal)

    // ######################################################################

    // Member Save Minimal (versioned)

    CEREAL_MAKE_HAS_MEMBER_SAVE_MINIMAL_IMPL(versioned_save_minimal, CEREAL_MAKE_VERSIONED_TEST)

    CEREAL_MAKE_HAS_MEMBER_SAVE_MINIMAL_HELPERS_IMPL(versioned_save_minimal, CEREAL_MAKE_VERSIONED_TEST)

    CEREAL_MAKE_HAS_MEMBER_SAVE_MINIMAL_TEST(versioned_save_minimal)

    // ######################################################################

    #undef CEREAL_MAKE_HAS_MEMBER_SAVE_MINIMAL_IMPL

    #undef CEREAL_MAKE_HAS_MEMBER_SAVE_MINIMAL_HELPERS_IMPL

    #undef CEREAL_MAKE_HAS_MEMBER_SAVE_MINIMAL_TEST

    // ######################################################################

    //! Creates a test for whether a non-member save_minimal function exists

    /*! This creates a class derived from std::integral_constant that will be true if

        the type has the proper member function for the given archive.

        @param test_name The name to give the test (e.g. save_minimal or versioned_save_minimal)

        @param versioned Either blank or the macro CEREAL_MAKE_VERSIONED_TEST */

    #define CEREAL_MAKE_HAS_NON_MEMBER_SAVE_MINIMAL_TEST(test_name, versioned)                                               \

    namespace detail                                                                                                         \

    {                                                                                                                        \

      template <class T, class A>                                                                                            \

      struct has_non_member_##test_name##_impl                                                                               \

      {                                                                                                                      \

        template <class TT, class AA>                                                                                        \

        static auto test(int) -> decltype( CEREAL_SAVE_MINIMAL_FUNCTION_NAME(                                                \

              std::declval<AA const &>(),                                                                                    \

              std::declval<TT const &>() versioned ), yes());                                                                \

        template <class, class> static no test(...);                                                                         \

        static const bool value = std::is_same<decltype(test<T, A>(0)), yes>::value;                                         \

                                                                                                                             \

        template <class TT, class AA>                                                                                        \

        static auto test2(int) -> decltype( CEREAL_SAVE_MINIMAL_FUNCTION_NAME(                                               \

              std::declval<AA const &>(),                                                                                    \

              std::declval<typename std::remove_const<TT>::type&>() versioned ), yes());                                     \

        template <class, class> static no test2(...);                                                                        \

        static const bool not_const_type = std::is_same<decltype(test2<T, A>(0)), yes>::value;                               \

                                                                                                                             \

        static const bool valid = value || !not_const_type;                                                                  \

      };                                                                                                                     \

                                                                                                                             \

      template <class T, class A, bool Valid>                                                                                \

      struct get_non_member_##test_name##_type { using type = void; };                                                       \

                                                                                                                             \

      template <class T, class A>                                                                                            \

      struct get_non_member_##test_name##_type <T, A, true>                                                                  \

      {                                                                                                                      \

        using type = decltype( CEREAL_SAVE_MINIMAL_FUNCTION_NAME( std::declval<A const &>(),                                 \

                                                                  std::declval<T const &>() versioned ) );                   \

      };                                                                                                                     \

    } /* end namespace detail */                                                                                             \

                                                                                                                             \

    template <class T, class A>                                                                                              \

    struct has_non_member_##test_name : std::integral_constant<bool, detail::has_non_member_##test_name##_impl<T, A>::value> \

    {                                                                                                                        \

      using check = typename detail::has_non_member_##test_name##_impl<T, A>;                                                \

      static_assert( check::valid,                                                                                           \

        "cereal detected a non-const type parameter in non-member " #test_name ". \n "                                       \

        #test_name " non-member functions must always pass their types as const" );                                          \

                                                                                                                             \

      using type = typename detail::get_non_member_##test_name##_type<T, A, check::value>::type;                             \

      static_assert( (check::value && is_minimal_type<type>::value) || !check::value,                                        \

        "cereal detected a non-member " #test_name " with an invalid return type. \n "                                       \

        "return type must be arithmetic or string" );                                                                        \

    };

    // ######################################################################

    // Non-Member Save Minimal

    CEREAL_MAKE_HAS_NON_MEMBER_SAVE_MINIMAL_TEST(save_minimal, )

    // ######################################################################

    // Non-Member Save Minimal (versioned)

    CEREAL_MAKE_HAS_NON_MEMBER_SAVE_MINIMAL_TEST(versioned_save_minimal, CEREAL_MAKE_VERSIONED_TEST)

    // ######################################################################

    #undef CEREAL_MAKE_HAS_NON_MEMBER_SAVE_MINIMAL_TEST

    // ######################################################################

    // Load Minimal Utilities

    namespace detail

    {

      //! Used to help strip away conversion wrappers

      /*! If someone writes a non-member load/save minimal function that accepts its

          parameter as some generic template type and needs to perform trait checks

          on that type, our NoConvert wrappers will interfere with this.  Using

          the struct strip_minmal, users can strip away our wrappers to get to

          the underlying type, allowing traits to work properly */

      struct NoConvertBase {};

      //! A struct that prevents implicit conversion

      /*! Any type instantiated with this struct will be unable to implicitly convert

          to another type.  Is designed to only allow conversion to Source const &.

          @tparam Source the type of the original source */

      template <class Source>

      struct NoConvertConstRef : NoConvertBase

      {

        using type = Source; //!< Used to get underlying type easily

        template <class Dest, class = typename std::enable_if<std::is_same<Source, Dest>::value>::type>

        operator Dest () = delete;

        //! only allow conversion if the types are the same and we are converting into a const reference

        template <class Dest, class = typename std::enable_if<std::is_same<Source, Dest>::value>::type>

        operator Dest const & ();

      };

      //! A struct that prevents implicit conversion

      /*! Any type instantiated with this struct will be unable to implicitly convert

          to another type.  Is designed to only allow conversion to Source &.

          @tparam Source the type of the original source */

      template <class Source>

      struct NoConvertRef : NoConvertBase

      {

        using type = Source; //!< Used to get underlying type easily

        template <class Dest, class = typename std::enable_if<std::is_same<Source, Dest>::value>::type>

        operator Dest () = delete;

        #ifdef __clang__

        template <class Dest, class = typename std::enable_if<std::is_same<Source, Dest>::value>::type>

        operator Dest const & () = delete;

        #endif // __clang__

        //! only allow conversion if the types are the same and we are converting into a const reference

        template <class Dest, class = typename std::enable_if<std::is_same<Source, Dest>::value>::type>

        operator Dest & ();

      };

      //! A type that can implicitly convert to anything else

      struct AnyConvert

      {

        template <class Dest>

        operator Dest & ();

        template <class Dest>

        operator Dest const & () const;

      };

    } // namespace detail

    // ######################################################################

    //! Creates a test for whether a member load_minimal function exists

    /*! This creates a class derived from std::integral_constant that will be true if

        the type has the proper member function for the given archive.

        Our strategy here is to first check if a function matching the signature more or less exists

        (allow anything like load_minimal(xxx) using AnyConvert, and then secondly enforce

        that it has the correct signature using NoConvertConstRef

        @param test_name The name to give the test (e.g. load_minimal or versioned_load_minimal)

        @param versioned Either blank or the macro CEREAL_MAKE_VERSIONED_TEST */

    #ifdef CEREAL_OLDER_GCC

    #define CEREAL_MAKE_HAS_MEMBER_LOAD_MINIMAL_IMPL(test_name, versioned)                                                    \

    namespace detail                                                                                                          \

    {                                                                                                                         \

      template <class T, class A, class SFINAE = void> struct has_member_##test_name##_impl : no {};                          \

      template <class T, class A>                                                                                             \

      struct has_member_##test_name##_impl<T, A, typename detail::Void< decltype(                                             \

          cereal::access::member_load_minimal( std::declval<A const &>(),                                                     \

                                               std::declval<T &>(), AnyConvert() versioned ) ) >::type> : yes {};             \

                                                                                                                              \

        template <class T, class A, class U, class SFINAE = void> struct has_member_##test_name##_type_impl : no {};          \

        template <class T, class A, class U>                                                                                  \

        struct has_member_##test_name##_type_impl<T, A, U, typename detail::Void< decltype(                                   \

            cereal::access::member_load_minimal( std::declval<A const &>(),                                                   \

                                                 std::declval<T &>(), NoConvertConstRef<U>() versioned ) ) >::type> : yes {}; \

    } /* end namespace detail */

    #else /* NOT CEREAL_OLDER_GCC =================================== */

    #define CEREAL_MAKE_HAS_MEMBER_LOAD_MINIMAL_IMPL(test_name, versioned)              \

    namespace detail                                                                    \

    {                                                                                   \

      template <class T, class A>                                                       \

      struct has_member_##test_name##_impl                                              \

      {                                                                                 \

        template <class TT, class AA>                                                   \

        static auto test(int) -> decltype( cereal::access::member_load_minimal(         \

              std::declval<AA const &>(),                                               \

              std::declval<TT &>(), AnyConvert() versioned ), yes());                   \

        template <class, class> static no test(...);                                    \

        static const bool value = std::is_same<decltype(test<T, A>(0)), yes>::value;    \

      };                                                                                \

      template <class T, class A, class U>                                              \

      struct has_member_##test_name##_type_impl                                         \

      {                                                                                 \

        template <class TT, class AA, class UU>                                         \

        static auto test(int) -> decltype( cereal::access::member_load_minimal(         \

              std::declval<AA const &>(),                                               \

              std::declval<TT &>(), NoConvertConstRef<UU>() versioned ), yes());        \

        template <class, class, class> static no test(...);                             \

        static const bool value = std::is_same<decltype(test<T, A, U>(0)), yes>::value; \

                                                                                        \

      };                                                                                \

    } /* end namespace detail */

    #endif // NOT CEREAL_OLDER_GCC

    // ######################################################################

    //! Creates helpers for minimal load functions

    /*! The has_member_*_wrapper structs ensure that the load and save types for the

        requested function type match appropriately.

        @param load_test_name The name to give the test (e.g. load_minimal or versioned_load_minimal)

        @param save_test_name The name to give the test (e.g. save_minimal or versioned_save_minimal,

                              should match the load name.

        @param save_test_prefix The name to give the test (e.g. save_minimal or versioned_save_minimal,

                              should match the load name, without the trailing "_minimal" (e.g.

                              save or versioned_save).  Needed because the preprocessor is an abomination.

        @param versioned Either blank or the macro CEREAL_MAKE_VERSIONED_TEST */

    #define CEREAL_MAKE_HAS_MEMBER_LOAD_MINIMAL_HELPERS_IMPL(load_test_name, save_test_name, save_test_prefix, versioned) \

    namespace detail                                                                                                      \

    {                                                                                                                     \

      template <class T, class A, bool Valid>                                                                             \

      struct has_member_##load_test_name##_wrapper : std::false_type {};                                                  \

                                                                                                                          \

      template <class T, class A>                                                                                         \

      struct has_member_##load_test_name##_wrapper<T, A, true>                                                            \

      {                                                                                                                   \

        using AOut = typename detail::get_output_from_input<A>::type;                                                     \

                                                                                                                          \

        static_assert( has_member_##save_test_prefix##_minimal<T, AOut>::value,                                           \

          "cereal detected member " #load_test_name " but no valid member " #save_test_name ". \n "                       \

          "cannot evaluate correctness of " #load_test_name " without valid " #save_test_name "." );                      \

                                                                                                                          \

        using SaveType = typename detail::get_member_##save_test_prefix##_minimal_type<T, AOut, true>::type;              \

        const static bool value = has_member_##load_test_name##_impl<T, A>::value;                                        \

        const static bool valid = has_member_##load_test_name##_type_impl<T, A, SaveType>::value;                         \

                                                                                                                          \

        static_assert( valid || !value, "cereal detected different or invalid types in corresponding member "             \

            #load_test_name " and " #save_test_name " functions. \n "                                                     \

            "the paramater to " #load_test_name " must be a constant reference to the type that "                         \

            #save_test_name " returns." );                                                                                \

      };                                                                                                                  \

    } /* end namespace detail */

    // ######################################################################

    //! Creates a test for whether a member load_minimal function exists

    /*! This creates a class derived from std::integral_constant that will be true if

        the type has the proper member function for the given archive.

        @param load_test_name The name to give the test (e.g. load_minimal or versioned_load_minimal)

        @param load_test_prefix The above parameter minus the trailing "_minimal" */

    #define CEREAL_MAKE_HAS_MEMBER_LOAD_MINIMAL_TEST(load_test_name, load_test_prefix)                                         \

    template <class T, class A>                                                                                                \

    struct has_member_##load_test_prefix##_minimal : std::integral_constant<bool,                                              \

      detail::has_member_##load_test_name##_wrapper<T, A, detail::has_member_##load_test_name##_impl<T, A>::value>::value> {};

    // ######################################################################

    // Member Load Minimal

    CEREAL_MAKE_HAS_MEMBER_LOAD_MINIMAL_IMPL(load_minimal, )

    CEREAL_MAKE_HAS_MEMBER_LOAD_MINIMAL_HELPERS_IMPL(load_minimal, save_minimal, save, )

    CEREAL_MAKE_HAS_MEMBER_LOAD_MINIMAL_TEST(load_minimal, load)

    // ######################################################################

    // Member Load Minimal (versioned)

    CEREAL_MAKE_HAS_MEMBER_LOAD_MINIMAL_IMPL(versioned_load_minimal, CEREAL_MAKE_VERSIONED_TEST)

    CEREAL_MAKE_HAS_MEMBER_LOAD_MINIMAL_HELPERS_IMPL(versioned_load_minimal, versioned_save_minimal, versioned_save, CEREAL_MAKE_VERSIONED_TEST)

    CEREAL_MAKE_HAS_MEMBER_LOAD_MINIMAL_TEST(versioned_load_minimal, versioned_load)

    // ######################################################################

    #undef CEREAL_MAKE_HAS_MEMBER_LOAD_MINIMAL_IMPL

    #undef CEREAL_MAKE_HAS_MEMBER_LOAD_MINIMAL_HELPERS_IMPL

    #undef CEREAL_MAKE_HAS_MEMBER_LOAD_MINIMAL_TEST

    // ######################################################################

    // Non-Member Load Minimal

    namespace detail

    {

      #ifdef CEREAL_OLDER_GCC

      void CEREAL_LOAD_MINIMAL_FUNCTION_NAME(); // prevents nonsense complaining about not finding this

      void CEREAL_SAVE_MINIMAL_FUNCTION_NAME();

      #endif // CEREAL_OLDER_GCC

    } // namespace detail

    // ######################################################################

    //! Creates a test for whether a non-member load_minimal function exists

    /*! This creates a class derived from std::integral_constant that will be true if

        the type has the proper member function for the given archive.

        See notes from member load_minimal implementation.

        @param test_name The name to give the test (e.g. load_minimal or versioned_load_minimal)

        @param save_name The corresponding name the save test would have (e.g. save_minimal or versioned_save_minimal)

        @param versioned Either blank or the macro CEREAL_MAKE_VERSIONED_TEST */

    #define CEREAL_MAKE_HAS_NON_MEMBER_LOAD_MINIMAL_TEST(test_name, save_name, versioned)                                    \

    namespace detail                                                                                                         \

    {                                                                                                                        \

      template <class T, class A, class U = void>                                                                            \

      struct has_non_member_##test_name##_impl                                                                               \

      {                                                                                                                      \

        template <class TT, class AA>                                                                                        \

        static auto test(int) -> decltype( CEREAL_LOAD_MINIMAL_FUNCTION_NAME(                                                \

              std::declval<AA const &>(), std::declval<TT&>(), AnyConvert() versioned ), yes() );                            \

        template <class, class> static no test( ... );                                                                       \

        static const bool exists = std::is_same<decltype( test<T, A>( 0 ) ), yes>::value;                                    \

                                                                                                                             \

        template <class TT, class AA, class UU>                                                                              \

        static auto test2(int) -> decltype( CEREAL_LOAD_MINIMAL_FUNCTION_NAME(                                               \

              std::declval<AA const &>(), std::declval<TT&>(), NoConvertConstRef<UU>() versioned ), yes() );                 \

        template <class, class, class> static no test2( ... );                                                               \

        static const bool valid = std::is_same<decltype( test2<T, A, U>( 0 ) ), yes>::value;                                 \

                                                                                                                             \

        template <class TT, class AA>                                                                                        \

        static auto test3(int) -> decltype( CEREAL_LOAD_MINIMAL_FUNCTION_NAME(                                               \

              std::declval<AA const &>(), NoConvertRef<TT>(), AnyConvert() versioned ), yes() );                             \

        template <class, class> static no test3( ... );                                                                      \

        static const bool const_valid = std::is_same<decltype( test3<T, A>( 0 ) ), yes>::value;                              \

      };                                                                                                                     \

                                                                                                                             \

      template <class T, class A, bool Valid>                                                                                \

      struct has_non_member_##test_name##_wrapper : std::false_type {};                                                      \

                                                                                                                             \

      template <class T, class A>                                                                                            \

      struct has_non_member_##test_name##_wrapper<T, A, true>                                                                \

      {                                                                                                                      \

        using AOut = typename detail::get_output_from_input<A>::type;                                                        \

                                                                                                                             \

        static_assert( detail::has_non_member_##save_name##_impl<T, AOut>::valid,                                            \

          "cereal detected non-member " #test_name " but no valid non-member " #save_name ". \n "                            \

          "cannot evaluate correctness of " #test_name " without valid " #save_name "." );                                   \

                                                                                                                             \

        using SaveType = typename detail::get_non_member_##save_name##_type<T, AOut, true>::type;                            \

        using check = has_non_member_##test_name##_impl<T, A, SaveType>;                                                     \

        static const bool value = check::exists;                                                                             \

                                                                                                                             \

        static_assert( check::valid || !check::exists, "cereal detected different types in corresponding non-member "        \

            #test_name " and " #save_name " functions. \n "                                                                  \

            "the paramater to " #test_name " must be a constant reference to the type that " #save_name " returns." );       \

        static_assert( check::const_valid || !check::exists,                                                                 \

            "cereal detected an invalid serialization type parameter in non-member " #test_name ".  "                        \

            #test_name " non-member functions must accept their serialization type by non-const reference" );                \

      };                                                                                                                     \

    } /* namespace detail */                                                                                                 \

                                                                                                                             \

    template <class T, class A>                                                                                              \

    struct has_non_member_##test_name : std::integral_constant<bool,                                                         \

      detail::has_non_member_##test_name##_wrapper<T, A, detail::has_non_member_##test_name##_impl<T, A>::exists>::value> {};

    // ######################################################################

    // Non-Member Load Minimal

    CEREAL_MAKE_HAS_NON_MEMBER_LOAD_MINIMAL_TEST(load_minimal, save_minimal, )

    // ######################################################################

    // Non-Member Load Minimal (versioned)

    CEREAL_MAKE_HAS_NON_MEMBER_LOAD_MINIMAL_TEST(versioned_load_minimal, versioned_save_minimal, CEREAL_MAKE_VERSIONED_TEST)

    // ######################################################################

    #undef CEREAL_MAKE_HAS_NON_MEMBER_LOAD_MINIMAL_TEST

    // ######################################################################

    // End of serialization existence tests

    #undef CEREAL_MAKE_VERSIONED_TEST

    // ######################################################################

    template <class T, class InputArchive, class OutputArchive>

    struct has_member_split : std::integral_constant<bool,

      (has_member_load<T, InputArchive>::value && has_member_save<T, OutputArchive>::value) ||

      (has_member_versioned_load<T, InputArchive>::value && has_member_versioned_save<T, OutputArchive>::value)> {};

    // ######################################################################

    template <class T, class InputArchive, class OutputArchive>

    struct has_non_member_split : std::integral_constant<bool,

      (has_non_member_load<T, InputArchive>::value && has_non_member_save<T, OutputArchive>::value) ||

      (has_non_member_versioned_load<T, InputArchive>::value && has_non_member_versioned_save<T, OutputArchive>::value)> {};

    // ######################################################################

    template <class T, class OutputArchive>