mirror of https://gitee.com/bigwinds/arangodb
59 lines
1.9 KiB
C++
59 lines
1.9 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// DISCLAIMER
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///
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/// Copyright 2014-2016 ArangoDB GmbH, Cologne, Germany
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/// Copyright 2004-2014 triAGENS GmbH, Cologne, Germany
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///
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/// Licensed under the Apache License, Version 2.0 (the "License");
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/// you may not use this file except in compliance with the License.
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/// You may obtain a copy of the License at
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///
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/// http://www.apache.org/licenses/LICENSE-2.0
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///
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/// Unless required by applicable law or agreed to in writing, software
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/// distributed under the License is distributed on an "AS IS" BASIS,
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/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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/// See the License for the specific language governing permissions and
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/// limitations under the License.
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///
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/// Copyright holder is ArangoDB GmbH, Cologne, Germany
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///
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/// @author Jan Christoph Uhde
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////////////////////////////////////////////////////////////////////////////////
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#ifndef ARANGODB_META_CONVERSION_H
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#define ARANGODB_META_CONVERSION_H 1
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#include <type_traits>
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namespace arangodb {
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namespace meta {
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namespace details {
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template <typename E>
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using enable_enum_t =
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typename std::enable_if<std::is_enum<E>::value, typename std::underlying_type<E>::type>::type;
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}
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template <typename E>
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constexpr details::enable_enum_t<E> underlyingValue(E e) noexcept {
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return static_cast<typename std::underlying_type<E>::type>(e);
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}
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template <typename E, typename T>
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constexpr typename std::enable_if<std::is_enum<E>::value && std::is_integral<T>::value, E>::type toEnum(
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T value) noexcept {
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return static_cast<E>(value);
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}
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template <typename E_OUT, typename E_IN>
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constexpr
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typename std::enable_if<std::is_enum<E_IN>::value && std::is_enum<E_OUT>::value, E_OUT>::type
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enumToEnum(E_IN value) noexcept {
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return toEnum<E_OUT>(underlyingValue(value));
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}
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} // namespace meta
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} // namespace arangodb
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#endif
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