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/*
* Copyright (C) 2005 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 ANDROID_STRONG_POINTER_H
#define ANDROID_STRONG_POINTER_H
#include <cutils/atomic.h>
#include <stdint.h>
#include <sys/types.h>
#include <stdlib.h>
// ---------------------------------------------------------------------------
namespace android {
class TextOutput;
TextOutput& printStrongPointer(TextOutput& to, const void* val);
template<typename T> class wp;
// ---------------------------------------------------------------------------
#define COMPARE(_op_) \
inline bool operator _op_ (const sp<T>& o) const { \
return m_ptr _op_ o.m_ptr; \
} \
inline bool operator _op_ (const T* o) const { \
return m_ptr _op_ o; \
} \
template<typename U> \
inline bool operator _op_ (const sp<U>& o) const { \
return m_ptr _op_ o.m_ptr; \
} \
template<typename U> \
inline bool operator _op_ (const U* o) const { \
return m_ptr _op_ o; \
} \
inline bool operator _op_ (const wp<T>& o) const { \
return m_ptr _op_ o.m_ptr; \
} \
template<typename U> \
inline bool operator _op_ (const wp<U>& o) const { \
return m_ptr _op_ o.m_ptr; \
}
// ---------------------------------------------------------------------------
template <typename T>
class sp
{
public:
inline sp() : m_ptr(0) { }
sp(T* other);
sp(const sp<T>& other);
template<typename U> sp(U* other);
template<typename U> sp(const sp<U>& other);
~sp();
// Assignment
sp& operator = (T* other);
sp& operator = (const sp<T>& other);
template<typename U> sp& operator = (const sp<U>& other);
template<typename U> sp& operator = (U* other);
//! Special optimization for use by ProcessState (and nobody else).
void force_set(T* other);
// Reset
void clear();
// Accessors
inline T& operator* () const { return *m_ptr; }
inline T* operator-> () const { return m_ptr; }
inline T* get() const { return m_ptr; }
// Operators
COMPARE(==)
COMPARE(!=)
COMPARE(>)
COMPARE(<)
COMPARE(<=)
COMPARE(>=)
private:
template<typename Y> friend class sp;
template<typename Y> friend class wp;
void set_pointer(T* ptr);
T* m_ptr;
};
#undef COMPARE
template <typename T>
TextOutput& operator<<(TextOutput& to, const sp<T>& val);
// ---------------------------------------------------------------------------
// No user serviceable parts below here.
template<typename T>
sp<T>::sp(T* other)
: m_ptr(other)
{
if (other) other->incStrong(this);
}
template<typename T>
sp<T>::sp(const sp<T>& other)
: m_ptr(other.m_ptr)
{
if (m_ptr) m_ptr->incStrong(this);
}
template<typename T> template<typename U>
sp<T>::sp(U* other) : m_ptr(other)
{
if (other) ((T*)other)->incStrong(this);
}
template<typename T> template<typename U>
sp<T>::sp(const sp<U>& other)
: m_ptr(other.m_ptr)
{
if (m_ptr) m_ptr->incStrong(this);
}
template<typename T>
sp<T>::~sp()
{
if (m_ptr) m_ptr->decStrong(this);
}
template<typename T>
sp<T>& sp<T>::operator = (const sp<T>& other) {
T* otherPtr(other.m_ptr);
if (otherPtr) otherPtr->incStrong(this);
if (m_ptr) m_ptr->decStrong(this);
m_ptr = otherPtr;
return *this;
}
template<typename T>
sp<T>& sp<T>::operator = (T* other)
{
if (other) other->incStrong(this);
if (m_ptr) m_ptr->decStrong(this);
m_ptr = other;
return *this;
}
template<typename T> template<typename U>
sp<T>& sp<T>::operator = (const sp<U>& other)
{
T* otherPtr(other.m_ptr);
if (otherPtr) otherPtr->incStrong(this);
if (m_ptr) m_ptr->decStrong(this);
m_ptr = otherPtr;
return *this;
}
template<typename T> template<typename U>
sp<T>& sp<T>::operator = (U* other)
{
if (other) ((T*)other)->incStrong(this);
if (m_ptr) m_ptr->decStrong(this);
m_ptr = other;
return *this;
}
template<typename T>
void sp<T>::force_set(T* other)
{
other->forceIncStrong(this);
m_ptr = other;
}
template<typename T>
void sp<T>::clear()
{
if (m_ptr) {
m_ptr->decStrong(this);
m_ptr = 0;
}
}
template<typename T>
void sp<T>::set_pointer(T* ptr) {
m_ptr = ptr;
}
template <typename T>
inline TextOutput& operator<<(TextOutput& to, const sp<T>& val)
{
return printStrongPointer(to, val.get());
}
}; // namespace android
// ---------------------------------------------------------------------------
#endif // ANDROID_STRONG_POINTER_H
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