60 lines
1.4 KiB
C++
60 lines
1.4 KiB
C++
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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 2018 Danny Robson <danny@nerdcruft.net>
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*/
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#ifndef CRUFT_UTIL_SINGLETON_HPP
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#define CRUFT_UTIL_SINGLETON_HPP
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#include "debug.hpp"
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#include <memory>
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namespace util {
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template <typename SelfT>
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class singleton {
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private:
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singleton () = default;
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static SelfT *instance;
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public:
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template <typename ...Args>
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static std::unique_ptr<SelfT>
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instantiate [[nodiscard]] (Args &&...args)
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{
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CHECK (!instance);
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auto cookie =std::make_unique<SelfT> (std::forward<Args> (args)...);
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instance = cookie.get ();
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return cookie;
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}
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static SelfT&
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get (void)
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{
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return *instance;
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}
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};
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};
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template <typename SelfT>
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SelfT*
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util::singleton<SelfT>::instance;
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#endif
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