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/*
* Copyright (C) 2017 The Android Open Source Project
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef ANDROID_SUPPORT_UNIQUE_PTR_H
#define ANDROID_SUPPORT_UNIQUE_PTR_H
namespace {
#define DISALLOW_COPY_AND_ASSIGN(TypeName) \
TypeName(const TypeName&) = delete; \
void operator=(const TypeName&) = delete
template <typename T>
struct DefaultDelete {
enum { type_must_be_complete = sizeof(T) };
DefaultDelete() {
}
void operator()(T* p) const {
delete p;
}
};
template <typename T>
struct DefaultDelete<T[]> {
enum { type_must_be_complete = sizeof(T) };
void operator()(T* p) const {
delete[] p;
}
};
template <typename T, typename D = DefaultDelete<T> >
class UniquePtr {
public:
explicit UniquePtr(T* ptr = NULL) : mPtr(ptr) {
}
~UniquePtr() {
reset();
}
T& operator*() const {
return *mPtr;
}
T* operator->() const {
return mPtr;
}
T* get() const {
return mPtr;
}
T* release() __attribute__((warn_unused_result)) {
T* result = mPtr;
mPtr = NULL;
return result;
}
void reset(T* ptr = NULL) {
if (ptr != mPtr) {
D()(mPtr);
mPtr = ptr;
}
}
private:
T* mPtr;
template <typename T2>
bool operator==(const UniquePtr<T2>& p) const;
template <typename T2>
bool operator!=(const UniquePtr<T2>& p) const;
DISALLOW_COPY_AND_ASSIGN(UniquePtr);
};
// Partial specialization for array types. Like std::unique_ptr, this removes
// operator* and operator-> but adds operator[].
template <typename T, typename D>
class UniquePtr<T[], D> {
public:
explicit UniquePtr(T* ptr = NULL) : mPtr(ptr) {
}
~UniquePtr() {
reset();
}
T& operator[](size_t i) const {
return mPtr[i];
}
T* get() const {
return mPtr;
}
T* release() __attribute__((warn_unused_result)) {
T* result = mPtr;
mPtr = NULL;
return result;
}
void reset(T* ptr = NULL) {
if (ptr != mPtr) {
D()(mPtr);
mPtr = ptr;
}
}
private:
T* mPtr;
DISALLOW_COPY_AND_ASSIGN(UniquePtr);
};
} // anonymous namespace
#endif /* ANDROID_SUPPORT_UNIQUE_PTR_H */
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