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class ref_counted
{
protected:
ref_counted( void ) : _count( 0 ) {}
public:
unsigned int add_ref( void ) { return ++_count; }
unsigned int release( void ) { return --_count; }
unsigned int count( void ) const { return _count; }
protected:
unsigned int _count;
};
template < class T >
class ref_ptr
{
public:
ref_ptr( T* ptr = 0 ) : _ptr( ptr )
{
add_ref();
}
ref_ptr( const ref_ptr & rptr ) : _ptr( rptr.get() )
{
add_ref();
}
~ref_ptr( void ) { release(); }
T* get( void ) const { return _ptr; }
T* operator->( void ) const { return get(); }
T& operator*( void ) const { return *get(); }
bool operator!( void ) const { return get() == 0; }
bool operator==( const ref_ptr & rptr ) const { return *get() == *rptr;
}
bool operator<( const ref_ptr & rptr ) const { return *get() < *rptr; }
bool operator==( T* ptr ) const { return *get() == *ptr; }
bool operator<( T* ptr ) const { return *get() < *ptr; }
const ref_ptr & operator=( const ref_ptr & rptr )
{
release();
_ptr = rptr.get();
add_ref();
return *this;
}
T* operator=( T* ptr )
{
release();
_ptr = ptr;
add_ref();
return _ptr;
}
protected:
void add_ref( void )
{
if( _ptr )
_ptr->add_ref();
}
void release( void )
{
if( _ptr && 0 == _ptr->release() )
{
delete _ptr;
_ptr = 0;
}
}
protected:
T * _ptr;
};
template< class T >
bool operator==( T* ptr, const ref_ptr< T > & rptr )
{
return *ptr == *rptr;
}
template< class T >
bool operator<( T* ptr, const ref_ptr< T > & rptr )
{
return *ptr < *rptr;
}
class Baz : public ref_counted {
int dummy;
};
class Bar;
int main() {
ref_ptr<Baz> foo;
static_cast<Bar *> (foo)->DoSomething; //ERROR - invalid cast
}
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