62 lines
2.1 KiB
C++
62 lines
2.1 KiB
C++
/*
|
|
* Copyright (C) 2022 The Android Open Source Project
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
#ifndef UTILS_PRIVATEIMPLEMENTATION_H
|
|
#define UTILS_PRIVATEIMPLEMENTATION_H
|
|
|
|
#include <utils/compiler.h>
|
|
|
|
#include <stddef.h>
|
|
|
|
namespace utils {
|
|
|
|
/**
|
|
* \privatesection
|
|
* PrivateImplementation is used to hide the implementation details of a class and ensure a higher
|
|
* level of backward binary compatibility.
|
|
* The actual implementation is in src/PrivateImplementation-impl.h"
|
|
*/
|
|
template<typename T>
|
|
class PrivateImplementation {
|
|
public:
|
|
// none of these methods must be implemented inline because it's important that their
|
|
// implementation be hidden from the public headers.
|
|
template<typename ... ARGS>
|
|
explicit PrivateImplementation(ARGS&& ...) noexcept;
|
|
PrivateImplementation() noexcept;
|
|
~PrivateImplementation() noexcept;
|
|
PrivateImplementation(PrivateImplementation const& rhs) noexcept;
|
|
PrivateImplementation& operator = (PrivateImplementation const& rhs) noexcept;
|
|
|
|
// move ctor and copy operator can be implemented inline and don't need to be exported
|
|
PrivateImplementation(PrivateImplementation&& rhs) noexcept : mImpl(rhs.mImpl) { rhs.mImpl = nullptr; }
|
|
PrivateImplementation& operator = (PrivateImplementation&& rhs) noexcept {
|
|
auto temp = mImpl;
|
|
mImpl = rhs.mImpl;
|
|
rhs.mImpl = temp;
|
|
return *this;
|
|
}
|
|
|
|
protected:
|
|
T* mImpl = nullptr;
|
|
inline T* operator->() noexcept { return mImpl; }
|
|
inline T const* operator->() const noexcept { return mImpl; }
|
|
};
|
|
|
|
} // namespace utils
|
|
|
|
#endif // UTILS_PRIVATEIMPLEMENTATION_H
|