63 lines
1.7 KiB
C++
63 lines
1.7 KiB
C++
/*
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* Copyright 2016 The Cartographer Authors
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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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#ifndef CARTOGRAPHER_COMMON_MAKE_UNIQUE_H_
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#define CARTOGRAPHER_COMMON_MAKE_UNIQUE_H_
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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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namespace cartographer {
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namespace common {
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// Implementation of c++14's std::make_unique, taken from
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// https://isocpp.org/files/papers/N3656.txt
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template <class T>
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struct _Unique_if {
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typedef std::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 std::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 std::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 std::remove_extent<T>::type U;
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return std::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 common
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} // namespace cartographer
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#endif // CARTOGRAPHER_COMMON_MAKE_UNIQUE_H_
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