481 lines
18 KiB
C++
481 lines
18 KiB
C++
// Copyright Ruslan Arutyunyan, 2019-2021.
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// Copyright Antony Polukhin, 2021-2022.
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//
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// Distributed under the Boost Software License, Version 1.0. (See
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// 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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// Contributed by Ruslan Arutyunyan
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#ifndef BOOST_ANYS_BASIC_ANY_HPP_INCLUDED
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#define BOOST_ANYS_BASIC_ANY_HPP_INCLUDED
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#include <boost/config.hpp>
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#ifdef BOOST_HAS_PRAGMA_ONCE
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# pragma once
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#endif
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#include <boost/any/bad_any_cast.hpp>
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#include <boost/any/fwd.hpp>
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#include <boost/assert.hpp>
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#include <boost/aligned_storage.hpp>
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#include <boost/type_index.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/remove_cv.hpp>
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#include <boost/type_traits/add_reference.hpp>
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#include <boost/type_traits/is_reference.hpp>
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#include <boost/type_traits/is_const.hpp>
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#include <boost/type_traits/is_nothrow_move_constructible.hpp>
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#include <boost/throw_exception.hpp>
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#include <boost/static_assert.hpp>
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#include <boost/utility/enable_if.hpp>
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#include <boost/core/addressof.hpp>
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#include <boost/type_traits/is_same.hpp>
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#include <boost/type_traits/conditional.hpp>
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namespace boost {
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namespace anys {
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template <std::size_t OptimizeForSize, std::size_t OptimizeForAlignment>
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class basic_any
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{
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BOOST_STATIC_ASSERT_MSG(OptimizeForSize > 0 && OptimizeForAlignment > 0, "Size and Align shall be positive values");
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BOOST_STATIC_ASSERT_MSG(OptimizeForSize >= OptimizeForAlignment, "Size shall non less than Align");
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BOOST_STATIC_ASSERT_MSG((OptimizeForAlignment & (OptimizeForAlignment - 1)) == 0, "Align shall be a power of 2");
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BOOST_STATIC_ASSERT_MSG(OptimizeForSize % OptimizeForAlignment == 0, "Size shall be multiple of alignment");
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private:
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enum operation
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{
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Destroy,
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Move,
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Copy,
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AnyCast,
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UnsafeCast,
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Typeinfo
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};
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template <typename ValueType>
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static void* small_manager(operation op, basic_any& left, const basic_any* right, const boost::typeindex::type_info* info)
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{
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switch (op)
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{
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case Destroy:
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BOOST_ASSERT(!left.empty());
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reinterpret_cast<ValueType*>(&left.content.small_value)->~ValueType();
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break;
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case Move: {
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BOOST_ASSERT(left.empty());
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BOOST_ASSERT(right);
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BOOST_ASSERT(!right->empty());
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BOOST_ASSERT(right->type() == boost::typeindex::type_id<ValueType>());
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ValueType* value = reinterpret_cast<ValueType*>(&const_cast<basic_any*>(right)->content.small_value);
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#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
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new (&left.content.small_value) ValueType(std::move(*value));
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#else
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new (&left.content.small_value) ValueType(*value);
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#endif
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left.man = right->man;
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reinterpret_cast<ValueType const*>(&right->content.small_value)->~ValueType();
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const_cast<basic_any*>(right)->man = 0;
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};
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break;
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case Copy:
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BOOST_ASSERT(left.empty());
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BOOST_ASSERT(right);
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BOOST_ASSERT(!right->empty());
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BOOST_ASSERT(right->type() == boost::typeindex::type_id<ValueType>());
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new (&left.content.small_value) ValueType(*reinterpret_cast<const ValueType*>(&right->content.small_value));
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left.man = right->man;
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break;
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case AnyCast:
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BOOST_ASSERT(info);
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BOOST_ASSERT(!left.empty());
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return boost::typeindex::type_id<ValueType>() == *info ?
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reinterpret_cast<typename remove_cv<ValueType>::type *>(&left.content.small_value) : 0;
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case UnsafeCast:
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BOOST_ASSERT(!left.empty());
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return reinterpret_cast<typename remove_cv<ValueType>::type *>(&left.content.small_value);
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case Typeinfo:
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return const_cast<void*>(static_cast<const void*>(&boost::typeindex::type_id<ValueType>().type_info()));
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}
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return 0;
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}
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template <typename ValueType>
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static void* large_manager(operation op, basic_any& left, const basic_any* right, const boost::typeindex::type_info* info)
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{
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switch (op)
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{
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case Destroy:
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BOOST_ASSERT(!left.empty());
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delete static_cast<ValueType*>(left.content.large_value);
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break;
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case Move:
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BOOST_ASSERT(left.empty());
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BOOST_ASSERT(right);
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BOOST_ASSERT(!right->empty());
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BOOST_ASSERT(right->type() == boost::typeindex::type_id<ValueType>());
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left.content.large_value = right->content.large_value;
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left.man = right->man;
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const_cast<basic_any*>(right)->content.large_value = 0;
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const_cast<basic_any*>(right)->man = 0;
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break;
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case Copy:
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BOOST_ASSERT(left.empty());
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BOOST_ASSERT(right);
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BOOST_ASSERT(!right->empty());
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BOOST_ASSERT(right->type() == boost::typeindex::type_id<ValueType>());
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left.content.large_value = new ValueType(*static_cast<const ValueType*>(right->content.large_value));
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left.man = right->man;
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break;
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case AnyCast:
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BOOST_ASSERT(info);
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BOOST_ASSERT(!left.empty());
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return boost::typeindex::type_id<ValueType>() == *info ?
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static_cast<typename remove_cv<ValueType>::type *>(left.content.large_value) : 0;
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case UnsafeCast:
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BOOST_ASSERT(!left.empty());
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return reinterpret_cast<typename remove_cv<ValueType>::type *>(left.content.large_value);
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case Typeinfo:
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return const_cast<void*>(static_cast<const void*>(&boost::typeindex::type_id<ValueType>().type_info()));
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}
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return 0;
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}
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template <typename ValueType>
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struct is_small_object : boost::integral_constant<bool, sizeof(ValueType) <= OptimizeForSize &&
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boost::alignment_of<ValueType>::value <= OptimizeForAlignment &&
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boost::is_nothrow_move_constructible<ValueType>::value>
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{};
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template <typename ValueType>
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static void create(basic_any& any, const ValueType& value, boost::true_type)
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{
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typedef typename boost::decay<const ValueType>::type DecayedType;
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any.man = &small_manager<DecayedType>;
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new (&any.content.small_value) ValueType(value);
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}
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template <typename ValueType>
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static void create(basic_any& any, const ValueType& value, boost::false_type)
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{
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typedef typename boost::decay<const ValueType>::type DecayedType;
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any.man = &large_manager<DecayedType>;
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any.content.large_value = new DecayedType(value);
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}
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#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
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template <typename ValueType>
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static void create(basic_any& any, ValueType&& value, boost::true_type)
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{
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typedef typename boost::decay<const ValueType>::type DecayedType;
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any.man = &small_manager<DecayedType>;
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new (&any.content.small_value) DecayedType(static_cast<ValueType&&>(value));
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}
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template <typename ValueType>
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static void create(basic_any& any, ValueType&& value, boost::false_type)
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{
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typedef typename boost::decay<const ValueType>::type DecayedType;
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any.man = &large_manager<DecayedType>;
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any.content.large_value = new DecayedType(static_cast<ValueType&&>(value));
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}
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#endif
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public: // non-type template parameters accessors
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static BOOST_CONSTEXPR_OR_CONST std::size_t buffer_size = OptimizeForSize;
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static BOOST_CONSTEXPR_OR_CONST std::size_t buffer_align = OptimizeForAlignment;
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public: // structors
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BOOST_CONSTEXPR basic_any() BOOST_NOEXCEPT
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: man(0), content()
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{
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}
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template<typename ValueType>
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basic_any(const ValueType & value)
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: man(0), content()
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{
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BOOST_STATIC_ASSERT_MSG(
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!(boost::is_same<ValueType, boost::any>::value),
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"boost::anys::basic_any shall not be constructed from boost::any"
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);
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BOOST_STATIC_ASSERT_MSG(
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!anys::detail::is_basic_any<ValueType>::value,
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"boost::anys::basic_any<A, B> shall not be constructed from boost::anys::basic_any<C, D>"
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);
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create(*this, value, is_small_object<ValueType>());
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}
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basic_any(const basic_any & other)
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: man(0), content()
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{
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if (other.man)
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{
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other.man(Copy, *this, &other, 0);
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}
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}
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#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
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// Move constructor
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basic_any(basic_any&& other) BOOST_NOEXCEPT
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: man(0), content()
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{
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if (other.man)
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{
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other.man(Move, *this, &other, 0);
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}
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}
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// Perfect forwarding of ValueType
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template<typename ValueType>
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basic_any(ValueType&& value
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, typename boost::disable_if<boost::is_same<basic_any&, ValueType> >::type* = 0 // disable if value has type `basic_any&`
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, typename boost::disable_if<boost::is_const<ValueType> >::type* = 0) // disable if value has type `const ValueType&&`
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: man(0), content()
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{
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typedef typename boost::decay<ValueType>::type DecayedType;
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BOOST_STATIC_ASSERT_MSG(
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!(boost::is_same<DecayedType, boost::any>::value),
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"boost::anys::basic_any shall not be constructed from boost::any"
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);
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BOOST_STATIC_ASSERT_MSG(
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!anys::detail::is_basic_any<DecayedType>::value,
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"boost::anys::basic_any<A, B> shall not be constructed from boost::anys::basic_any<C, D>"
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);
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create(*this, static_cast<ValueType&&>(value), is_small_object<DecayedType>());
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}
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#endif
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~basic_any() BOOST_NOEXCEPT
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{
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if (man)
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{
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man(Destroy, *this, 0, 0);
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}
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}
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public: // modifiers
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basic_any & swap(basic_any & rhs) BOOST_NOEXCEPT
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{
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if (this == &rhs)
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{
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return *this;
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}
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if (man && rhs.man)
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{
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basic_any tmp;
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rhs.man(Move, tmp, &rhs, 0);
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man(Move, rhs, this, 0);
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tmp.man(Move, *this, &tmp, 0);
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}
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else if (man)
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{
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man(Move, rhs, this, 0);
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}
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else if (rhs.man)
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{
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rhs.man(Move, *this, &rhs, 0);
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}
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return *this;
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}
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#ifdef BOOST_NO_CXX11_RVALUE_REFERENCES
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template<typename ValueType>
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basic_any & operator=(const ValueType & rhs)
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{
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BOOST_STATIC_ASSERT_MSG(
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!(boost::is_same<ValueType, boost::any>::value),
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"boost::any shall not be assigned into boost::anys::basic_any"
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);
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BOOST_STATIC_ASSERT_MSG(
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!anys::detail::is_basic_any<ValueType>::value,
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"boost::anys::basic_any<A, B> shall not be assigned into boost::anys::basic_any<C, D>"
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);
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basic_any(rhs).swap(*this);
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return *this;
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}
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basic_any & operator=(basic_any rhs)
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{
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rhs.swap(*this);
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return *this;
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}
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#else
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basic_any & operator=(const basic_any& rhs)
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{
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basic_any(rhs).swap(*this);
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return *this;
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}
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// move assignment
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basic_any & operator=(basic_any&& rhs) BOOST_NOEXCEPT
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{
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rhs.swap(*this);
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basic_any().swap(rhs);
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return *this;
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}
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// Perfect forwarding of ValueType
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template <class ValueType>
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basic_any & operator=(ValueType&& rhs)
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{
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typedef typename boost::decay<ValueType>::type DecayedType;
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BOOST_STATIC_ASSERT_MSG(
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!(boost::is_same<DecayedType, boost::any>::value),
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"boost::any shall not be assigned into boost::anys::basic_any"
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);
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BOOST_STATIC_ASSERT_MSG(
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(!anys::detail::is_basic_any<DecayedType>::value || boost::is_same<DecayedType, basic_any>::value),
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"boost::anys::basic_any<A, B> shall not be assigned into boost::anys::basic_any<C, D>"
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);
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basic_any(static_cast<ValueType&&>(rhs)).swap(*this);
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return *this;
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}
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#endif
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public: // queries
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bool empty() const BOOST_NOEXCEPT
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{
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return !man;
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}
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void clear() BOOST_NOEXCEPT
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{
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basic_any().swap(*this);
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}
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const boost::typeindex::type_info& type() const BOOST_NOEXCEPT
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{
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return man
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? *static_cast<const boost::typeindex::type_info*>(man(Typeinfo, const_cast<basic_any&>(*this), 0, 0))
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: boost::typeindex::type_id<void>().type_info();
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}
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private: // representation
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template<typename ValueType, std::size_t Size, std::size_t Alignment>
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friend ValueType * any_cast(basic_any<Size, Alignment> *) BOOST_NOEXCEPT;
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template<typename ValueType, std::size_t Size, std::size_t Alignment>
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friend ValueType * unsafe_any_cast(basic_any<Size, Alignment> *) BOOST_NOEXCEPT;
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typedef void*(*manager)(operation op, basic_any& left, const basic_any* right, const boost::typeindex::type_info* info);
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manager man;
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union content {
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void * large_value;
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typename boost::aligned_storage<OptimizeForSize, OptimizeForAlignment>::type small_value;
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} content;
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};
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template<std::size_t OptimizeForSize, std::size_t OptimizeForAlignment>
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void swap(basic_any<OptimizeForSize, OptimizeForAlignment>& lhs, basic_any<OptimizeForSize, OptimizeForAlignment>& rhs) BOOST_NOEXCEPT
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{
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lhs.swap(rhs);
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}
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template<typename ValueType, std::size_t Size, std::size_t Alignment>
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ValueType * any_cast(basic_any<Size, Alignment> * operand) BOOST_NOEXCEPT
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{
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return operand->man ?
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static_cast<typename remove_cv<ValueType>::type *>(operand->man(basic_any<Size, Alignment>::AnyCast, *operand, 0, &boost::typeindex::type_id<ValueType>().type_info()))
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: 0;
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}
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template<typename ValueType, std::size_t OptimizeForSize, std::size_t OptimizeForAlignment>
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inline const ValueType * any_cast(const basic_any<OptimizeForSize, OptimizeForAlignment> * operand) BOOST_NOEXCEPT
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{
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return any_cast<ValueType>(const_cast<basic_any<OptimizeForSize, OptimizeForAlignment> *>(operand));
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}
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template<typename ValueType, std::size_t OptimizeForSize, std::size_t OptimizeForAlignment>
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ValueType any_cast(basic_any<OptimizeForSize, OptimizeForAlignment> & operand)
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{
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typedef typename remove_reference<ValueType>::type nonref;
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nonref * result = any_cast<nonref>(boost::addressof(operand));
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if(!result)
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boost::throw_exception(bad_any_cast());
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// Attempt to avoid construction of a temporary object in cases when
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// `ValueType` is not a reference. Example:
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// `static_cast<std::string>(*result);`
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// which is equal to `std::string(*result);`
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typedef typename boost::conditional<
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boost::is_reference<ValueType>::value,
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ValueType,
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typename boost::add_reference<ValueType>::type
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>::type ref_type;
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#ifdef BOOST_MSVC
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# pragma warning(push)
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# pragma warning(disable: 4172) // "returning address of local variable or temporary" but *result is not local!
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#endif
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return static_cast<ref_type>(*result);
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#ifdef BOOST_MSVC
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# pragma warning(pop)
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#endif
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}
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template<typename ValueType, std::size_t OptimizeForSize, std::size_t OptimizeForAlignment>
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inline ValueType any_cast(const basic_any<OptimizeForSize, OptimizeForAlignment> & operand)
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{
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typedef typename remove_reference<ValueType>::type nonref;
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return any_cast<const nonref &>(const_cast<basic_any<OptimizeForSize, OptimizeForAlignment> &>(operand));
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}
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#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
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template<typename ValueType, std::size_t OptimizeForSize, std::size_t OptimizeForAlignment>
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inline ValueType any_cast(basic_any<OptimizeForSize, OptimizeForAlignment>&& operand)
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{
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BOOST_STATIC_ASSERT_MSG(
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boost::is_rvalue_reference<ValueType&&>::value /*true if ValueType is rvalue or just a value*/
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|| boost::is_const< typename boost::remove_reference<ValueType>::type >::value,
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"boost::any_cast shall not be used for getting nonconst references to temporary objects"
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);
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return any_cast<ValueType>(operand);
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}
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#endif
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// Note: The "unsafe" versions of any_cast are not part of the
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// public interface and may be removed at any time. They are
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// required where we know what type is stored in the any and can't
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// use typeid() comparison, e.g., when our types may travel across
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// different shared libraries.
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template<typename ValueType, std::size_t OptimizedForSize, std::size_t OptimizeForAlignment>
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inline ValueType * unsafe_any_cast(basic_any<OptimizedForSize, OptimizeForAlignment> * operand) BOOST_NOEXCEPT
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{
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return static_cast<ValueType*>(operand->man(basic_any<OptimizedForSize, OptimizeForAlignment>::UnsafeCast, *operand, 0, 0));
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}
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template<typename ValueType, std::size_t OptimizeForSize, std::size_t OptimizeForAlignment>
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inline const ValueType * unsafe_any_cast(const basic_any<OptimizeForSize, OptimizeForAlignment> * operand) BOOST_NOEXCEPT
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{
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return unsafe_any_cast<ValueType>(const_cast<basic_any<OptimizeForSize, OptimizeForAlignment> *>(operand));
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}
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} // namespace anys
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using boost::anys::any_cast;
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using boost::anys::unsafe_any_cast;
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} // namespace boost
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#endif // #ifndef BOOST_ANYS_BASIC_ANY_HPP_INCLUDED
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