mirror of https://gitee.com/bigwinds/arangodb
82 lines
2.3 KiB
C++
82 lines
2.3 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 Dr. Frank Celler
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////////////////////////////////////////////////////////////////////////////////
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#ifndef ARANGODB_BASICS_MAKE__UNIQUE_H
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#define ARANGODB_BASICS_MAKE__UNIQUE_H 1
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#include <cstddef>
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#include <memory>
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#include <type_traits>
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#include <utility>
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// VS 2013 and VS 2015 already provide std::make_unique
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#ifndef _WIN32
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// c++98: 199711 (not supported)
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// c++11: 201103 (no std::make_unique)
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// c++14: 201402 (std::make_unique included)
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#if __cplusplus == 201103L
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////////////////////////////////////////////////////////////////////////////////
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/// Provide a make_unique() function for C++11 too
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/// http://stackoverflow.com/questions/17902405/how-to-implement-make-unique-function-in-c11
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////////////////////////////////////////////////////////////////////////////////
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namespace std {
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template <class T>
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struct _Unique_if {
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typedef unique_ptr<T> _Single_object;
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};
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template <class T>
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struct _Unique_if<T[]> {
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typedef unique_ptr<T[]> _Unknown_bound;
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};
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template <class T, size_t N>
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struct _Unique_if<T[N]> {
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typedef void _Known_bound;
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};
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template <class T, class... Args>
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typename _Unique_if<T>::_Single_object make_unique(Args&&... args) {
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return unique_ptr<T>(new T(std::forward<Args>(args)...));
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}
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template <class T>
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typename _Unique_if<T>::_Unknown_bound make_unique(size_t n) {
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typedef typename remove_extent<T>::type U;
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return unique_ptr<T>(new U[n]());
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}
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template <class T, class... Args>
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typename _Unique_if<T>::_Known_bound make_unique(Args&&...) = delete;
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} // namespace std
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#endif
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#endif
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#endif
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