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#ifndef OPAQUE_EXPERIMENTAL_POSITION_TYPEDEF_HPP
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#define OPAQUE_EXPERIMENTAL_POSITION_TYPEDEF_HPP
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//
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// Copyright (c) 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 "../numeric_typedef.hpp"
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namespace opaque {
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namespace experimental {
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/// \addtogroup typedefs
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/// @{
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///
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/// Numeric opaque typedef to represent a position
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///
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/// This is a numeric typedef base class providing interoperability between
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/// two types for the + and - operations as follows:
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/// - position + position --> type error
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/// - position + distance --> position
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/// - distance + position --> position
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/// - distance + distance --> distance
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/// - position - position --> distance
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/// - position - distance --> position
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/// - distance - position --> type error
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/// - distance - distance --> distance
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///
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/// Template arguments for position_typedef:
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/// -# Distance : The distance type, which must be a numeric opaque typedef
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/// -# O : The opaque type, your subclass
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///
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template <typename Distance, typename O>
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struct position_typedef
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: numeric_typedef_base<typename Distance::underlying_type, O,
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typename Distance::shift_type>
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, binop::addable <O , true , O , Distance>
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, binop::addable <O , true , Distance, O >
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, binop::subtractable<O , false, O , Distance>
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, binop::subtractable<Distance, false, O , O ,
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typename Distance::underlying_type,
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typename Distance::underlying_type>
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{
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private:
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using base =
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numeric_typedef_base<typename Distance::underlying_type, O,
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typename Distance::shift_type>;
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public:
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using typename base::underlying_type;
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using typename base::opaque_type;
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using base::value;
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opaque_type& operator+=(const opaque_type&) = delete;
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opaque_type& operator-=(const opaque_type&) = delete;
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constexpr14 opaque_type& operator+=(const Distance& s) &
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noexcept(noexcept( value += s.value )) {
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value += s.value;
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return downcast(); }
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constexpr14 opaque_type& operator-=(const Distance& s) &
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noexcept(noexcept( value -= s.value )) {
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value -= s.value;
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return downcast(); }
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using base::base;
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explicit position_typedef() = default;
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position_typedef(const position_typedef& ) = default;
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position_typedef( position_typedef&&) = default;
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position_typedef& operator=(const position_typedef& ) & = default;
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position_typedef& operator=( position_typedef&&) & = default;
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protected:
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~position_typedef() = default;
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using base::downcast;
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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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