 |
|
|
|
|
|
|
|
|
|
|
|
|
| • |
When
a member function is to be bound to a pointer or
|
|
|
reference
at run time, the function accessed is obtained by
|
|
|
selecting
the correct member function pointer out of the
|
|
|
virtual
table pointed to by the current object's virtual
|
|
|
pointer.
It doesn't matter what the type of the object is, its
|
|
|
virtual
pointer will point to the correct virtual table of
|
|
|
function
pointers for that object.
|
|
|
| • |
Note
the additional costs of dynamic binding. With static
|
|
|
binding,
a member function is directly bound to an object.
|
|
With
dynamic binding, three additional levels of
|
|
|
indirection
may be needed to bind the correct member
|
|
|
function
pointer with a pointer or reference to an object.
|
|
