Public Types | Public Member Functions

ConstPointerTo< T > Class Template Reference

A ConstPointerTo is similar to a PointerTo, except it keeps a const pointer to the thing. More...

#include "pointerTo.h"

Inheritance diagram for ConstPointerTo< T >:
PointerToBase< T > PointerToVoid MemoryBase

List of all members.

Public Types

typedef PointerToBase< T >::To To

Public Member Functions

 ConstPointerTo (const To *ptr=(const To *) NULL)
 ConstPointerTo (const PointerTo< T > &copy)
 ConstPointerTo (const ConstPointerTo< T > &copy)
void clear ()
 A convenient way to set the PointerTo object to NULL.
 operator const T * () const
 We also have the typecast operator to automatically convert ConstPointerTo's to the required kind of actual pointer.
const To & operator* () const
const To * operator-> () const
ConstPointerTo< T > & operator= (const PointerTo< T > &copy)
ConstPointerTo< T > & operator= (const To *ptr)
ConstPointerTo< T > & operator= (const ConstPointerTo< T > &copy)
const To * p () const
 Returns an ordinary pointer instead of a ConstPointerTo.

Detailed Description

template<class T>
class ConstPointerTo< T >

A ConstPointerTo is similar to a PointerTo, except it keeps a const pointer to the thing.

(Actually, it keeps a non-const pointer, because it must be allowed to adjust the reference counts, and it must be able to delete it when the reference count goes to zero. But it presents only a const pointer to the outside world.)

Notice that a PointerTo may be assigned to a ConstPointerTo, but a ConstPointerTo may not be assigned to a PointerTo.

Definition at line 137 of file pointerTo.h.

Member Function Documentation

template<class T>
void ConstPointerTo< T >::clear ( ) [inline]

A convenient way to set the PointerTo object to NULL.

(Assignment to a NULL pointer also works, of course.)

Reimplemented from PointerToBase< T >.

Definition at line 162 of file pointerTo.h.

template<class T >
ConstPointerTo< T >::operator const T * ( ) const [inline]

We also have the typecast operator to automatically convert ConstPointerTo's to the required kind of actual pointer.

This introduces ambiguities which the compiler will resolve one way or the other, but we don't care which way it goes because either will be correct.

Definition at line 204 of file pointerTo.I.

template<class T >
const ConstPointerTo< T >::To * ConstPointerTo< T >::p ( ) const [inline]

Returns an ordinary pointer instead of a ConstPointerTo.

Useful to work around compiler problems, particularly for implicit upcasts.

Definition at line 217 of file pointerTo.I.

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