mirror of https://gitee.com/bigwinds/arangodb
59 lines
1.8 KiB
C++
59 lines
1.8 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_UTILITY_H
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#define ARANGODB_META_UTILITY_H 1
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#include <memory>
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namespace arangodb {
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namespace meta {
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////////////////////////////////////////////////////////////////////////////////
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/// @brief adjusts constness of 'Out' according to 'In'
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////////////////////////////////////////////////////////////////////////////////
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template <typename In, typename Out>
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struct adjustConst {
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typedef Out value_type;
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typedef Out& reference;
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typedef Out* pointer;
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};
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template <typename In, typename Out>
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struct adjustConst<const In, Out> {
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typedef const Out value_type;
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typedef const Out& reference;
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typedef const Out* pointer;
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};
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template <class T, class U = T>
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T exchange(T& obj, U&& new_value) {
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T old_value = std::move(obj);
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obj = std::forward<U>(new_value);
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return old_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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