forked from boostorg/optional
Reverted specialization for trivial types
It caused too many problems. I left only specialiation for scalar types. I will need to devise clever type traits for reconizing trivial types with working constructor.
This commit is contained in:
98
include/boost/optional/detail/experimental_traits.hpp
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98
include/boost/optional/detail/experimental_traits.hpp
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// Copyright (C) 2017 Andrzej Krzemienski.
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//
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// Use, modification, and distribution is subject to the Boost Software
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// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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// See http://www.boost.org/libs/optional for documentation.
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//
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// You are welcome to contact the author at:
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// akrzemi1@gmail.com
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#ifndef BOOST_OPTIONAL_DETAIL_EXPERIMENTAL_TRAITS_04NOV2017_HPP
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#define BOOST_OPTIONAL_DETAIL_EXPERIMENTAL_TRAITS_04NOV2017_HPP
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#include <boost/config.hpp>
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#include <boost/detail/workaround.hpp>
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#include <boost/type_traits.hpp>
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namespace boost { namespace optional_detail {
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// The condition to use POD implementation
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#ifdef BOOST_OPTIONAL_CONFIG_NO_POD_SPEC
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# define BOOST_OPTIONAL_DETAIL_NO_SPEC_FOR_TRIVIAL_TYPES
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#elif defined BOOST_OPTIONAL_CONFIG_NO_SPEC_FOR_TRIVIAL_TYPES
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# define BOOST_OPTIONAL_DETAIL_NO_SPEC_FOR_TRIVIAL_TYPES
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#elif !defined BOOST_HAS_TRIVIAL_CONSTRUCTOR
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# define BOOST_OPTIONAL_DETAIL_NO_SPEC_FOR_TRIVIAL_TYPES
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#elif !defined BOOST_HAS_TRIVIAL_MOVE_ASSIGN
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# define BOOST_OPTIONAL_DETAIL_NO_SPEC_FOR_TRIVIAL_TYPES
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#elif !defined BOOST_HAS_TRIVIAL_MOVE_CONSTRUCTOR
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# define BOOST_OPTIONAL_DETAIL_NO_SPEC_FOR_TRIVIAL_TYPES
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#elif !defined BOOST_HAS_TRIVIAL_COPY
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# define BOOST_OPTIONAL_DETAIL_NO_SPEC_FOR_TRIVIAL_TYPES
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#elif !defined BOOST_HAS_TRIVIAL_ASSIGN
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# define BOOST_OPTIONAL_DETAIL_NO_SPEC_FOR_TRIVIAL_TYPES
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#elif !defined BOOST_HAS_TRIVIAL_DESTRUCTOR
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# define BOOST_OPTIONAL_DETAIL_NO_SPEC_FOR_TRIVIAL_TYPES
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#elif BOOST_WORKAROUND(BOOST_GCC, < 50000)
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# define BOOST_OPTIONAL_DETAIL_NO_SPEC_FOR_TRIVIAL_TYPES
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#endif
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#if __cplusplus >= 201103L
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# if BOOST_WORKAROUND(BOOST_GCC, >= 50000)
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# define BOOST_OPTIONAL_DETAIL_USE_STD_TYPE_TRAITS
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# elif (defined BOOST_CLANG)
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# define BOOST_OPTIONAL_DETAIL_USE_STD_TYPE_TRAITS
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# endif
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#endif
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#ifndef BOOST_OPTIONAL_DETAIL_USE_STD_TYPE_TRAITS
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# define BOOST_OPTIONAL_DETAIL_HAS_TRIVIAL_CTOR(T) BOOST_HAS_TRIVIAL_CONSTRUCTOR(T)
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#else
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# define BOOST_OPTIONAL_DETAIL_HAS_TRIVIAL_CTOR(T) std::is_trivially_default_constructible<T>::value
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#endif
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#ifndef BOOST_OPTIONAL_DETAIL_NO_SPEC_FOR_TRIVIAL_TYPES
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template <typename T>
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struct is_type_trivially_copyable
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: boost::conditional<(boost::has_trivial_copy_constructor<T>::value &&
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boost::has_trivial_move_constructor<T>::value &&
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boost::has_trivial_destructor<T>::value &&
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boost::has_trivial_move_assign<T>::value &&
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boost::has_trivial_assign<T>::value),
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boost::true_type, boost::false_type>::type
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{};
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#else
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template <typename T>
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struct is_type_trivially_copyable
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: boost::conditional<(boost::is_scalar<T>::value && !boost::is_const<T>::value && !boost::is_volatile<T>::value),
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boost::true_type, boost::false_type>::type
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{};
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#endif
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#ifndef BOOST_OPTIONAL_DETAIL_NO_SPEC_FOR_TRIVIAL_TYPES
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template <typename T>
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struct optional_uses_direct_storage_for_
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: boost::conditional< (is_type_trivially_copyable<T>::value && BOOST_OPTIONAL_DETAIL_HAS_TRIVIAL_CTOR(T)) ||
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(boost::is_scalar<T>::value && !boost::is_const<T>::value && !boost::is_volatile<T>::value)
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, boost::true_type, boost::false_type>::type
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{};
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#else
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template <typename T>
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struct optional_uses_direct_storage_for_
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: boost::conditional<(boost::is_scalar<T>::value && !boost::is_const<T>::value && !boost::is_volatile<T>::value)
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, boost::true_type, boost::false_type>::type
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{};
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#endif
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}} // boost::optional_detail
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#endif
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@ -15,7 +15,6 @@
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#include <boost/config.hpp>
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#include <boost/detail/workaround.hpp>
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#include <boost/type_traits/intrinsics.hpp>
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#if (defined BOOST_NO_CXX11_RVALUE_REFERENCES) || (defined BOOST_OPTIONAL_CONFIG_NO_RVALUE_REFERENCES)
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# define BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES
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@ -126,38 +125,8 @@
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#endif
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// The condition to use POD implementation
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#ifdef BOOST_OPTIONAL_CONFIG_NO_POD_SPEC
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# define BOOST_OPTIONAL_DETAIL_NO_SPEC_FOR_TRIVIAL_TYPES
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#elif defined BOOST_OPTIONAL_CONFIG_NO_SPEC_FOR_TRIVIAL_TYPES
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# define BOOST_OPTIONAL_DETAIL_NO_SPEC_FOR_TRIVIAL_TYPES
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#elif !defined BOOST_HAS_TRIVIAL_CONSTRUCTOR
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# define BOOST_OPTIONAL_DETAIL_NO_SPEC_FOR_TRIVIAL_TYPES
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#elif !defined BOOST_HAS_TRIVIAL_MOVE_ASSIGN
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# define BOOST_OPTIONAL_DETAIL_NO_SPEC_FOR_TRIVIAL_TYPES
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#elif !defined BOOST_HAS_TRIVIAL_MOVE_CONSTRUCTOR
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# define BOOST_OPTIONAL_DETAIL_NO_SPEC_FOR_TRIVIAL_TYPES
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#elif !defined BOOST_HAS_TRIVIAL_COPY
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# define BOOST_OPTIONAL_DETAIL_NO_SPEC_FOR_TRIVIAL_TYPES
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#elif !defined BOOST_HAS_TRIVIAL_ASSIGN
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# define BOOST_OPTIONAL_DETAIL_NO_SPEC_FOR_TRIVIAL_TYPES
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#elif !defined BOOST_HAS_TRIVIAL_DESTRUCTOR
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# define BOOST_OPTIONAL_DETAIL_NO_SPEC_FOR_TRIVIAL_TYPES
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#elif BOOST_WORKAROUND(BOOST_GCC, < 50000)
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# define BOOST_OPTIONAL_DETAIL_NO_SPEC_FOR_TRIVIAL_TYPES
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#endif
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#if __cplusplus >= 201103L
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# if BOOST_WORKAROUND(BOOST_GCC, >= 50000)
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# define BOOST_OPTIONAL_DETAIL_USE_STD_TYPE_TRAITS
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# elif (defined BOOST_CLANG)
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# define BOOST_OPTIONAL_DETAIL_USE_STD_TYPE_TRAITS
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# endif
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#endif
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#ifdef BOOST_OPTIONAL_CONFIG_NO_POD_SPEC
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# define BOOST_OPTIONAL_DETAIL_NO_POD_SPEC
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#ifdef BOOST_OPTIONAL_CONFIG_NO_DIRECT_STORAE_SPEC
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# define BOOST_OPTIONAL_DETAIL_NO_DIRECT_STORAE_SPEC
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#endif
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@ -40,12 +40,6 @@
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#include <boost/type_traits/remove_const.hpp>
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#include <boost/type_traits/remove_reference.hpp>
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#include <boost/type_traits/decay.hpp>
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#include <boost/type_traits/has_trivial_copy.hpp>
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#include <boost/type_traits/has_trivial_move_constructor.hpp>
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#include <boost/type_traits/has_trivial_constructor.hpp>
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#include <boost/type_traits/has_trivial_assign.hpp>
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#include <boost/type_traits/has_trivial_move_assign.hpp>
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#include <boost/type_traits/has_trivial_destructor.hpp>
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#include <boost/type_traits/is_base_of.hpp>
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#include <boost/type_traits/is_const.hpp>
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#include <boost/type_traits/is_constructible.hpp>
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@ -809,55 +803,21 @@ struct is_optional_val_init_candidate
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, boost::true_type, boost::false_type>::type
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{};
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#ifndef BOOST_OPTIONAL_DETAIL_NO_SPEC_FOR_TRIVIAL_TYPES
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template <typename T>
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struct is_type_trivially_copyable
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: boost::conditional<(boost::has_trivial_copy_constructor<T>::value &&
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boost::has_trivial_move_constructor<T>::value &&
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boost::has_trivial_destructor<T>::value &&
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boost::has_trivial_move_assign<T>::value &&
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boost::has_trivial_assign<T>::value),
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boost::true_type, boost::false_type>::type
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{};
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#else
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template <typename T>
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struct is_type_trivially_copyable
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: boost::conditional<(boost::is_scalar<T>::value && !boost::is_const<T>::value && !boost::is_volatile<T>::value),
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boost::true_type, boost::false_type>::type
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{};
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#endif
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} // namespace optional_detail
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namespace optional_config {
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#ifndef BOOST_OPTIONAL_DETAIL_USE_STD_TYPE_TRAITS
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# define BOOST_OPTIONAL_DETAIL_HAS_TRIVIAL_CTOR(T) BOOST_HAS_TRIVIAL_CONSTRUCTOR(T)
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#else
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# define BOOST_OPTIONAL_DETAIL_HAS_TRIVIAL_CTOR(T) std::is_trivially_default_constructible<T>::value
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#endif
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#ifndef BOOST_OPTIONAL_DETAIL_NO_SPEC_FOR_TRIVIAL_TYPES
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template <typename T>
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struct is_type_trivial
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: boost::conditional< (optional_detail::is_type_trivially_copyable<T>::value && BOOST_OPTIONAL_DETAIL_HAS_TRIVIAL_CTOR(T)) ||
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(boost::is_scalar<T>::value && !boost::is_const<T>::value && !boost::is_volatile<T>::value)
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, boost::true_type, boost::false_type>::type
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{};
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#else
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template <typename T>
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struct is_type_trivial
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struct optional_uses_direct_storage_for
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: boost::conditional<(boost::is_scalar<T>::value && !boost::is_const<T>::value && !boost::is_volatile<T>::value)
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, boost::true_type, boost::false_type>::type
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{};
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#endif
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} // namespace optional_config
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#ifndef BOOST_OPTIONAL_DETAIL_NO_POD_SPEC
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# define BOOST_OPTIONAL_BASE_TYPE(T) boost::conditional< optional_config::is_type_trivial<T>::value, \
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#ifndef BOOST_OPTIONAL_DETAIL_NO_DIRECT_STORAE_SPEC
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# define BOOST_OPTIONAL_BASE_TYPE(T) boost::conditional< optional_config::optional_uses_direct_storage_for<T>::value, \
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optional_detail::tc_optional_base<T>, \
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optional_detail::optional_base<T> \
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>::type
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