88 lines
2.2 KiB
C++
88 lines
2.2 KiB
C++
#pragma once
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#include <fc/utility.hpp>
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namespace fc {
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/**
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* @brief used to create reference counted types.
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*
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* Must be a virtual base class that is initialized with the
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*
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*/
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class retainable {
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public:
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retainable();
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void retain();
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void release();
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int32_t retain_count()const;
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protected:
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virtual ~retainable();
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private:
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volatile int32_t _ref_count;
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};
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template<typename T>
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class shared_ptr {
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public:
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template<typename Other>
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shared_ptr( const shared_ptr<Other>& o )
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:_ptr(o.get()) {
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if(_ptr) _ptr->retain();
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}
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shared_ptr( T* t, bool inc = false )
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:_ptr(t) { if( inc ) t->retain(); }
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shared_ptr():_ptr(nullptr){}
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shared_ptr( const shared_ptr& p ) {
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_ptr = p._ptr;
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if( _ptr ) _ptr->retain();
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}
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shared_ptr( shared_ptr&& p ) {
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_ptr = p._ptr;
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p._ptr = nullptr;
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}
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~shared_ptr() { if( _ptr ) { _ptr->release(); } }
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shared_ptr& reset( T* v = 0, bool inc = false ) {
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if( v == _ptr ) return *this;
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if( _ptr ) _ptr->release();
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_ptr = v;
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if( _ptr && inc ) _ptr->retain();
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return *this;
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}
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shared_ptr& operator=(const shared_ptr& p ) {
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shared_ptr tmp(p);
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fc::swap(tmp._ptr,_ptr);
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return *this;
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}
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shared_ptr& operator=(shared_ptr&& p ) {
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fc::swap(_ptr,p._ptr);
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return *this;
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}
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T& operator* ()const { return *_ptr; }
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T* operator-> ()const { return _ptr; }
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bool operator==( const shared_ptr& p )const { return get() == p.get(); }
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bool operator<( const shared_ptr& p )const { return get() < p.get(); }
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T * get() const { return _ptr; }
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bool operator!()const { return _ptr == 0; }
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operator bool()const { return _ptr != 0; }
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private:
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T* _ptr;
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};
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template<typename T, typename O>
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fc::shared_ptr<T> dynamic_pointer_cast( const fc::shared_ptr<O>& t ) {
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return fc::shared_ptr<T>( dynamic_cast<T*>(t.get()), true );
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}
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template<typename T, typename O>
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fc::shared_ptr<T> static_pointer_cast( const fc::shared_ptr<O>& t ) {
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return fc::shared_ptr<T>( static_cast<T*>(t.get()), true );
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}
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}
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