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//
// Copyright 2021 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// CLRefPointer.h: A non-owning intrinsic reference counting smart pointer for CL objects.
#ifndef LIBANGLE_CLREFPOINTER_H_
#define LIBANGLE_CLREFPOINTER_H_
#include <algorithm>
namespace cl
{
template <typename T>
class RefPointer
{
public:
RefPointer() noexcept : mCLObject(nullptr) {}
explicit RefPointer(T *object) noexcept : mCLObject(object)
{
if (mCLObject != nullptr)
{
mCLObject->retain();
}
}
~RefPointer()
{
if (mCLObject != nullptr && mCLObject->release())
{
delete mCLObject;
}
}
RefPointer(std::nullptr_t) noexcept : mCLObject(nullptr) {}
RefPointer &operator=(std::nullptr_t)
{
reset();
return *this;
}
RefPointer(RefPointer &&other) noexcept : mCLObject(nullptr) { this->swap(other); }
RefPointer &operator=(RefPointer &&other)
{
this->swap(other);
return *this;
}
RefPointer(const RefPointer<T> &other) : mCLObject(other.mCLObject)
{
if (mCLObject != nullptr)
{
mCLObject->retain();
}
}
RefPointer &operator=(const RefPointer<T> &other)
{
if (this != &other)
{
reset();
mCLObject = other.mCLObject;
if (mCLObject != nullptr)
{
mCLObject->retain();
}
}
return *this;
}
T *operator->() const { return mCLObject; }
T &operator*() const { return *mCLObject; }
T *get() const { return mCLObject; }
explicit operator bool() const { return mCLObject != nullptr; }
T *release() noexcept
{
T *const object = mCLObject;
mCLObject = nullptr;
return object;
}
void swap(RefPointer &other) noexcept { std::swap(mCLObject, other.mCLObject); }
void reset()
{
if (mCLObject != nullptr)
{
T *const object = release();
object->release();
}
}
private:
T *mCLObject;
};
template <typename T>
void swap(RefPointer<T> &left, RefPointer<T> &right)
{
left.swap(right);
}
template <typename T>
bool operator==(const RefPointer<T> &ptr, std::nullptr_t) noexcept
{
return ptr.get() == nullptr;
}
template <typename T>
bool operator==(std::nullptr_t, const RefPointer<T> &ptr) noexcept
{
return ptr.get() == nullptr;
}
template <typename T>
bool operator!=(const RefPointer<T> &ptr, std::nullptr_t) noexcept
{
return ptr.get() != nullptr;
}
template <typename T>
bool operator!=(std::nullptr_t, const RefPointer<T> &ptr) noexcept
{
return ptr.get() != nullptr;
}
template <typename T, typename U>
bool operator==(const RefPointer<T> &left, const RefPointer<U> &right) noexcept
{
return left.get() == right.get();
}
template <typename T, typename U>
bool operator!=(const RefPointer<T> &left, const RefPointer<U> &right) noexcept
{
return left.get() != right.get();
}
template <typename T, typename U>
bool operator==(const RefPointer<T> &left, const U *right) noexcept
{
return left.get() == right;
}
template <typename T, typename U>
bool operator==(const T *left, const RefPointer<U> &right) noexcept
{
return left == right.get();
}
template <typename T, typename U>
bool operator!=(const RefPointer<T> &left, const U *right) noexcept
{
return left.get() != right;
}
template <typename T, typename U>
bool operator!=(const T *left, const RefPointer<U> &right) noexcept
{
return left != right.get();
}
} // namespace cl
#endif // LIBANGLE_CLREFPOINTER_H_
|
