mirror of https://gitee.com/bigwinds/arangodb
58 lines
2.0 KiB
C++
58 lines
2.0 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// DISCLAIMER
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///
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/// Copyright 2017 ArangoDB 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 Andrey Abramov
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/// @author Vasiliy Nabatchikov
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////////////////////////////////////////////////////////////////////////////////
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#ifndef ARANGOD_IRESEARCH__IRESEARCH_MISC_H
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#define ARANGOD_IRESEARCH__IRESEARCH_MISC_H 1
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#include <type_traits>
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namespace arangodb {
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namespace iresearch {
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////////////////////////////////////////////////////////////////////////////////
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/// @returns true if values from the specified range [Min;Max] are adjacent,
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/// false otherwise
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////////////////////////////////////////////////////////////////////////////////
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template <typename T>
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struct adjacencyChecker {
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typedef typename std::enable_if<std::is_enum<T>::value, T>::type type_t;
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template <type_t Max>
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static constexpr bool checkAdjacency() noexcept {
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return true;
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}
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template <type_t Max, type_t Min, type_t... Types>
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static constexpr bool checkAdjacency() noexcept {
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typedef typename std::underlying_type<type_t>::type underlying_t;
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return (Max > Min) && (1 == (underlying_t(Max) - underlying_t(Min))) &&
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checkAdjacency<Min, Types...>();
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}
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}; // adjacencyCheker
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} // namespace iresearch
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} // namespace arangodb
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#endif // ARANGOD_IRESEARCH__IRESEARCH_MISC_H
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