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#ifndef OPAQUE_DATA_HPP
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#define OPAQUE_DATA_HPP
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//
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// Copyright (c) 2015, 2016
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// Kyle Markley. All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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//
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// 1. Redistributions of source code must retain the above copyright notice,
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// this list of conditions and the following disclaimer.
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// 2. Redistributions in binary form must reproduce the above copyright notice,
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// this list of conditions and the following disclaimer in the documentation
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// and/or other materials provided with the distribution.
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// 3. Neither the name of the author nor the names of any contributors may be
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// used to endorse or promote products derived from this software without
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// specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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// POSSIBILITY OF SUCH DAMAGE.
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//
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#include "constexpr14.hpp"
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#include "utility.hpp"
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#include <type_traits>
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namespace opaque {
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/// \addtogroup internal
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/// @{
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///
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/// Data storage for opaque typedefs
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///
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template <typename U, typename O>
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struct data {
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typedef U underlying_type;
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typedef O opaque_type;
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underlying_type value;
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/// Copy the underlying value
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explicit constexpr operator underlying_type() const &
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noexcept(std::is_nothrow_copy_constructible<underlying_type>::value) {
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return value ;
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}
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/// Move the underlying value
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explicit constexpr14 operator underlying_type() &&
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noexcept(std::is_nothrow_move_constructible<underlying_type>::value) {
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return opaque::move(value);
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}
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/// Construct
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template <typename... Args>
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explicit constexpr data(Args&&... args)
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noexcept(std::is_nothrow_constructible<underlying_type, Args&&...>::value)
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: value(opaque::forward<Args>(args)...) { }
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data() = default;
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data(const data& ) = default;
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data( data&&) = default;
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data& operator=(const data& ) & = default;
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data& operator=( data&&) & = default;
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protected:
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~data() = default;
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/// Downcast to the opaque_type
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constexpr14 opaque_type& downcast() noexcept {
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static_assert(std::is_base_of<data, opaque_type>::value, "Bad downcast");
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return *static_cast<opaque_type*>(this);
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}
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};
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/// @}
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}
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#endif
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