171 lines
4.0 KiB
C++
171 lines
4.0 KiB
C++
/*
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* smartpointer.h
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* Android
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*
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* Copyright 2005 The Android Open Source Project
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*
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*/
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#ifndef ANDROID_SMART_POINTER_H
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#define ANDROID_SMART_POINTER_H
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#include <stdint.h>
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#include <sys/types.h>
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#include <stdlib.h>
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// ---------------------------------------------------------------------------
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namespace android {
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// ---------------------------------------------------------------------------
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#define COMPARE(_op_) \
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inline bool operator _op_ (const sp<T>& o) const { \
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return m_ptr _op_ o.m_ptr; \
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} \
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inline bool operator _op_ (const T* o) const { \
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return m_ptr _op_ o; \
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} \
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template<typename U> \
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inline bool operator _op_ (const sp<U>& o) const { \
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return m_ptr _op_ o.m_ptr; \
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} \
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template<typename U> \
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inline bool operator _op_ (const U* o) const { \
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return m_ptr _op_ o; \
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}
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// ---------------------------------------------------------------------------
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template <typename T>
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class sp
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{
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public:
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inline sp() : m_ptr(0) { }
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sp(T* other);
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sp(const sp<T>& other);
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template<typename U> sp(U* other);
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template<typename U> sp(const sp<U>& other);
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~sp();
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// Assignment
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sp& operator = (T* other);
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sp& operator = (const sp<T>& other);
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template<typename U> sp& operator = (const sp<U>& other);
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template<typename U> sp& operator = (U* other);
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// Reset
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void clear();
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// Accessors
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inline T& operator* () const { return *m_ptr; }
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inline T* operator-> () const { return m_ptr; }
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inline T* get() const { return m_ptr; }
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// Operators
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COMPARE(==)
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COMPARE(!=)
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COMPARE(>)
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COMPARE(<)
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COMPARE(<=)
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COMPARE(>=)
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private:
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template<typename Y> friend class sp;
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T* m_ptr;
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};
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// ---------------------------------------------------------------------------
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// No user serviceable parts below here.
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template<typename T>
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sp<T>::sp(T* other)
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: m_ptr(other)
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{
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if (other) other->incStrong(this);
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}
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template<typename T>
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sp<T>::sp(const sp<T>& other)
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: m_ptr(other.m_ptr)
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{
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if (m_ptr) m_ptr->incStrong(this);
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}
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template<typename T> template<typename U>
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sp<T>::sp(U* other) : m_ptr(other)
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{
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if (other) other->incStrong(this);
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}
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template<typename T> template<typename U>
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sp<T>::sp(const sp<U>& other)
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: m_ptr(other.m_ptr)
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{
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if (m_ptr) m_ptr->incStrong(this);
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}
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template<typename T>
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sp<T>::~sp()
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{
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if (m_ptr) m_ptr->decStrong(this);
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}
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template<typename T>
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sp<T>& sp<T>::operator = (const sp<T>& other) {
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if (other.m_ptr) other.m_ptr->incStrong(this);
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if (m_ptr) m_ptr->decStrong(this);
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m_ptr = other.m_ptr;
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return *this;
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}
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template<typename T>
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sp<T>& sp<T>::operator = (T* other)
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{
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if (other) other->incStrong(this);
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if (m_ptr) m_ptr->decStrong(this);
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m_ptr = other;
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return *this;
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}
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template<typename T> template<typename U>
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sp<T>& sp<T>::operator = (const sp<U>& other)
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{
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if (other.m_ptr) other.m_ptr->incStrong(this);
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if (m_ptr) m_ptr->decStrong(this);
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m_ptr = other.m_ptr;
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return *this;
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}
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template<typename T> template<typename U>
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sp<T>& sp<T>::operator = (U* other)
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{
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if (other) other->incStrong(this);
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if (m_ptr) m_ptr->decStrong(this);
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m_ptr = other;
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return *this;
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}
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template<typename T>
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void sp<T>::clear()
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{
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if (m_ptr) {
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m_ptr->decStrong(this);
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m_ptr = 0;
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}
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}
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// ---------------------------------------------------------------------------
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}; // namespace android
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// ---------------------------------------------------------------------------
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#endif // ANDROID_SMART_POINTER_H
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