60 lines
2.1 KiB
C++
60 lines
2.1 KiB
C++
/*
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* Copyright (C) 2022 The Android Open Source Project
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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 UTILS_PRIVATEIMPLEMENTATION_H
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#define UTILS_PRIVATEIMPLEMENTATION_H
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#include <stddef.h>
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namespace utils {
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/**
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* \privatesection
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* PrivateImplementation is used to hide the implementation details of a class and ensure a higher
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* level of backward binary compatibility.
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* The actual implementation is in src/PrivateImplementation-impl.h"
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*/
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template<typename T>
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class PrivateImplementation {
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public:
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// none of these methods must be implemented inline because it's important that their
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// implementation be hidden from the public headers.
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template<typename ... ARGS>
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explicit PrivateImplementation(ARGS&& ...) noexcept;
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PrivateImplementation() noexcept;
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~PrivateImplementation() noexcept;
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PrivateImplementation(PrivateImplementation const& rhs) noexcept;
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PrivateImplementation& operator = (PrivateImplementation const& rhs) noexcept;
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// move ctor and copy operator can be implemented inline and don't need to be exported
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PrivateImplementation(PrivateImplementation&& rhs) noexcept : mImpl(rhs.mImpl) { rhs.mImpl = nullptr; }
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PrivateImplementation& operator = (PrivateImplementation&& rhs) noexcept {
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auto temp = mImpl;
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mImpl = rhs.mImpl;
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rhs.mImpl = temp;
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return *this;
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}
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protected:
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T* mImpl = nullptr;
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inline T* operator->() noexcept { return mImpl; }
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inline T const* operator->() const noexcept { return mImpl; }
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};
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} // namespace utils
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#endif // UTILS_PRIVATEIMPLEMENTATION_H
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