|
|
#ifndef OPAQUE_DATA_HPP
|
|
|
#define OPAQUE_DATA_HPP
|
|
|
//
|
|
|
// Copyright (c) 2015, 2016
|
|
|
// Kyle Markley. All rights reserved.
|
|
|
//
|
|
|
// Redistribution and use in source and binary forms, with or without
|
|
|
// modification, are permitted provided that the following conditions are met:
|
|
|
//
|
|
|
// 1. Redistributions of source code must retain the above copyright notice,
|
|
|
// this list of conditions and the following disclaimer.
|
|
|
// 2. 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.
|
|
|
// 3. Neither the name of the author nor the names of any 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 THE COPYRIGHT HOLDER OR CONTRIBUTORS 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.
|
|
|
//
|
|
|
#include "constexpr14.hpp"
|
|
|
#include "utility.hpp"
|
|
|
#include <type_traits>
|
|
|
|
|
|
namespace opaque {
|
|
|
|
|
|
/// \addtogroup internal
|
|
|
/// @{
|
|
|
|
|
|
///
|
|
|
/// Data storage for opaque typedefs
|
|
|
///
|
|
|
template <typename U, typename O>
|
|
|
struct data {
|
|
|
typedef U underlying_type;
|
|
|
typedef O opaque_type;
|
|
|
|
|
|
underlying_type value;
|
|
|
|
|
|
/// Copy the underlying value
|
|
|
explicit constexpr operator underlying_type() const &
|
|
|
noexcept(std::is_nothrow_copy_constructible<underlying_type>::value) {
|
|
|
return value ;
|
|
|
}
|
|
|
|
|
|
/// Move the underlying value
|
|
|
explicit constexpr14 operator underlying_type() &&
|
|
|
noexcept(std::is_nothrow_move_constructible<underlying_type>::value) {
|
|
|
return opaque::move(value);
|
|
|
}
|
|
|
|
|
|
/// Construct
|
|
|
template <typename... Args>
|
|
|
explicit constexpr data(Args&&... args)
|
|
|
noexcept(std::is_nothrow_constructible<underlying_type, Args&&...>::value)
|
|
|
: value(opaque::forward<Args>(args)...) { }
|
|
|
|
|
|
data() = default;
|
|
|
data(const data& ) = default;
|
|
|
data( data&&) = default;
|
|
|
data& operator=(const data& ) & = default;
|
|
|
data& operator=( data&&) & = default;
|
|
|
protected:
|
|
|
~data() = default;
|
|
|
|
|
|
/// Downcast to the opaque_type
|
|
|
constexpr14 opaque_type& downcast() noexcept {
|
|
|
static_assert(std::is_base_of<data, opaque_type>::value, "Bad downcast");
|
|
|
return *static_cast<opaque_type*>(this);
|
|
|
}
|
|
|
|
|
|
};
|
|
|
|
|
|
/// @}
|
|
|
|
|
|
}
|
|
|
|
|
|
#endif
|
|
|
|
