mirror of https://github.com/tfussell/xlnt
48 lines
1.7 KiB
C++
48 lines
1.7 KiB
C++
// Copyright (c) 2016-2018 Thomas Fussell
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, WRISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE
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//
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// @license: http://www.opensource.org/licenses/mit-license.php
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// @author: see AUTHORS file
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#pragma once
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#include <utility> // for std::hash
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namespace xlnt {
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/// <summary>
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/// Allows a scoped enum (aka "enum class") to be used as a key
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/// in a std::unordered_map.
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/// </summary>
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template<typename Enum>
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struct scoped_enum_hash
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{
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/// <summary>
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/// Cast the enumeration e to a std::size_t and hash that value using std::hash.
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/// </summary>
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std::size_t operator()(Enum e) const
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{
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static std::hash<std::size_t> hasher;
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return hasher(static_cast<std::size_t>(e));
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}
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};
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} // namespace xlnt
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