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Editing: experimental_traits.hpp
// Copyright (C) 2017 Andrzej Krzemienski. // // Use, modification, and distribution is subject to the Boost Software // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at // http://www.boost.org/LICENSE_1_0.txt) // // See http://www.boost.org/libs/optional for documentation. // // You are welcome to contact the author at: // akrzemi1@gmail.com #ifndef BOOST_OPTIONAL_DETAIL_EXPERIMENTAL_TRAITS_04NOV2017_HPP #define BOOST_OPTIONAL_DETAIL_EXPERIMENTAL_TRAITS_04NOV2017_HPP #include <boost/config.hpp> #include <boost/detail/workaround.hpp> #include <boost/predef.h> #include <boost/type_traits.hpp> // The condition to use POD implementation #ifdef BOOST_OPTIONAL_CONFIG_NO_POD_SPEC # define BOOST_OPTIONAL_DETAIL_NO_SPEC_FOR_TRIVIAL_TYPES #elif defined BOOST_OPTIONAL_CONFIG_NO_SPEC_FOR_TRIVIAL_TYPES # define BOOST_OPTIONAL_DETAIL_NO_SPEC_FOR_TRIVIAL_TYPES #elif !defined BOOST_HAS_TRIVIAL_CONSTRUCTOR # define BOOST_OPTIONAL_DETAIL_NO_SPEC_FOR_TRIVIAL_TYPES #elif !defined BOOST_HAS_TRIVIAL_MOVE_ASSIGN # define BOOST_OPTIONAL_DETAIL_NO_SPEC_FOR_TRIVIAL_TYPES #elif !defined BOOST_HAS_TRIVIAL_MOVE_CONSTRUCTOR # define BOOST_OPTIONAL_DETAIL_NO_SPEC_FOR_TRIVIAL_TYPES #elif !defined BOOST_HAS_TRIVIAL_COPY # define BOOST_OPTIONAL_DETAIL_NO_SPEC_FOR_TRIVIAL_TYPES #elif !defined BOOST_HAS_TRIVIAL_ASSIGN # define BOOST_OPTIONAL_DETAIL_NO_SPEC_FOR_TRIVIAL_TYPES #elif !defined BOOST_HAS_TRIVIAL_DESTRUCTOR # define BOOST_OPTIONAL_DETAIL_NO_SPEC_FOR_TRIVIAL_TYPES #elif BOOST_WORKAROUND(BOOST_GCC, < 50000) # define BOOST_OPTIONAL_DETAIL_NO_SPEC_FOR_TRIVIAL_TYPES #endif // GCC 5 or higher, or clang with libc++ or clang with libstdc++ 5 or higher #if __cplusplus >= 201103L # if BOOST_WORKAROUND(BOOST_GCC, >= 50000) # define BOOST_OPTIONAL_DETAIL_USE_STD_TYPE_TRAITS # elif (defined BOOST_CLANG) # if BOOST_LIB_STD_CXX > 0 # define BOOST_OPTIONAL_DETAIL_USE_STD_TYPE_TRAITS # elif BOOST_LIB_STD_GNU >= 441200023 && BOOST_LIB_STD_GNU != 450600023 && BOOST_LIB_STD_GNU != 450600026 && BOOST_LIB_STD_GNU != 460800003 && BOOST_LIB_STD_GNU != 450400026 && BOOST_LIB_STD_GNU != 460700026 # define BOOST_OPTIONAL_DETAIL_USE_STD_TYPE_TRAITS # endif # endif #endif #ifndef BOOST_OPTIONAL_DETAIL_USE_STD_TYPE_TRAITS # define BOOST_OPTIONAL_DETAIL_HAS_TRIVIAL_CTOR(T) BOOST_HAS_TRIVIAL_CONSTRUCTOR(T) #else # include <type_traits> # define BOOST_OPTIONAL_DETAIL_HAS_TRIVIAL_CTOR(T) std::is_trivially_default_constructible<T>::value #endif namespace boost { namespace optional_detail { #ifndef BOOST_OPTIONAL_DETAIL_NO_SPEC_FOR_TRIVIAL_TYPES template <typename T> struct is_type_trivially_copyable : boost::conditional<(boost::has_trivial_copy_constructor<T>::value && boost::has_trivial_move_constructor<T>::value && boost::has_trivial_destructor<T>::value && boost::has_trivial_move_assign<T>::value && boost::has_trivial_assign<T>::value), boost::true_type, boost::false_type>::type {}; #else template <typename T> struct is_type_trivially_copyable : boost::conditional<(boost::is_scalar<T>::value && !boost::is_const<T>::value && !boost::is_volatile<T>::value), boost::true_type, boost::false_type>::type {}; #endif #ifndef BOOST_OPTIONAL_DETAIL_NO_SPEC_FOR_TRIVIAL_TYPES template <typename T> struct optional_uses_direct_storage_for_ : boost::conditional< (is_type_trivially_copyable<T>::value && BOOST_OPTIONAL_DETAIL_HAS_TRIVIAL_CTOR(T)) || (boost::is_scalar<T>::value && !boost::is_const<T>::value && !boost::is_volatile<T>::value) , boost::true_type, boost::false_type>::type {}; #else template <typename T> struct optional_uses_direct_storage_for_ : boost::conditional<(boost::is_scalar<T>::value && !boost::is_const<T>::value && !boost::is_volatile<T>::value) , boost::true_type, boost::false_type>::type {}; #endif }} // boost::optional_detail #endif
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