ReferenceHolder< T > Class Template Reference

a templated class to manage a reference count of an object that can throw a Qore-language exception when dereferenced More...

#include <ReferenceHolder.h>

Collaboration diagram for ReferenceHolder< T >:

Public Member Functions
DLLLOCAL	ReferenceHolder (ExceptionSink *xsink_)
	creates an empty ReferenceHolder
DLLLOCAL	ReferenceHolder (T *p_, ExceptionSink *xsink_)
	populates with object with data and the ExceptionSink pointer
DLLLOCAL	~ReferenceHolder ()
	calls deref(ExceptionSink *) on the pointer being managed if not 0
DLLLOCAL T **	getPtrPtr ()
	returns a pointer to the pointer being managed
DLLLOCAL T *&	getRef ()
	returns a reference to the ptr being managed
DLLLOCAL	operator bool () const
	returns true if a non-0 pointer is being managed
DLLLOCAL T *	operator* ()
	returns the pointer being managed
DLLLOCAL const T *	operator* () const
	returns the pointer being managed
DLLLOCAL T *	operator-> ()
	returns the pointer being managed
DLLLOCAL const T *	operator-> () const
	returns the pointer being managed
DLLLOCAL void	operator= (T *nv)
	assigns a new pointer to the holder, dereferences the current pointer if any
DLLLOCAL T *	release ()
	releases the pointer to the caller
DLLLOCAL T *	swap (T *val)
	swaps the current value for a new one

Detailed Description

template<typename T = class AbstractQoreNode>
class ReferenceHolder< T >

a templated class to manage a reference count of an object that can throw a Qore-language exception when dereferenced

the destructor will call deref(ExceptionSink *)

ReferenceHolder<QoreQFont> holder(self->getReferencedPrivateData(CID_QFONT, xsink), xsink);
// the call to deref(ExceptionSink *) is automatic when the object goes out of scope
if (*xsink)
   return 0;
return holder->styleHint();

Member Function Documentation

swap()

template<typename T = class AbstractQoreNode>

DLLLOCAL T * ReferenceHolder< T >::swap ( T * val )

inline

swaps the current value for a new one

Since

Qore 1.14

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The documentation for this class was generated from the following file:

• include/qore/ReferenceHolder.h