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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>
    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);
    // 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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