weakbase.h

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#ifndef INCLUDED_TOOLS_WEAKBASE_H
#define INCLUDED_TOOLS_WEAKBASE_H
 
#include <sal/types.h>
#include <rtl/ref.hxx>
#include <tools/toolsdllapi.h>
 
namespace tools
{
class WeakBase;
 
struct WeakConnection
{
    sal_Int32   mnRefCount;
    WeakBase*   mpReference;
 
    WeakConnection() : mnRefCount( 0 ), mpReference( nullptr ) {};
    WeakConnection( WeakBase* pReference ) : mnRefCount( 0 ), mpReference( pReference ) {};
    void acquire() { mnRefCount++; }
    void release() { mnRefCount--; if( mnRefCount == 0 ) delete this; }
};
 
template <class reference_type>
class SAL_WARN_UNUSED WeakReference
{
public:
    inline WeakReference();
 
    inline WeakReference( reference_type* pReference );
 
    inline WeakReference( const WeakReference< reference_type >& rWeakRef );
 
    inline WeakReference( WeakReference< reference_type >&& rWeakRef );
 
    inline bool is() const;
 
    operator bool() const { return is(); }
 
    inline reference_type * get() const;
 
    inline void reset( reference_type* pReference );
 
    inline void reset();
 
    inline reference_type * operator->() const;
 
    inline reference_type& operator*() const;
 
    inline bool operator== (const reference_type * pReferenceObject) const;
 
    inline bool operator== (const WeakReference<reference_type> & handle) const;
 
    inline bool operator!= (const WeakReference<reference_type> & handle) const;
 
    inline bool operator< (const WeakReference<reference_type> & handle) const;
 
    inline bool operator> (const WeakReference<reference_type> & handle) const;
 
    inline WeakReference<reference_type>& operator= (const WeakReference<reference_type> & handle);
 
    inline WeakReference<reference_type>& operator= (WeakReference<reference_type> && handle);
 
private:
    rtl::Reference<WeakConnection> mpWeakConnection;
};
 
class TOOLS_DLLPUBLIC WeakBase
{
    template<typename T> friend class WeakReference;
 
public:
    WeakBase() {}
    virtual ~WeakBase();
    inline void clearWeak();
 
private:
    inline WeakConnection* getWeakConnection();
    rtl::Reference<WeakConnection> mpWeakConnection;
};
 
}
 
#endif
 
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