Lecture
You can define a pointer to data components.
datatype (class_name:: * pointer_name)
You can include its initializer in the definition of a pointer.
& class_name:: component_name
Example:
double (complex:: * pdat) = & complex:: re;
Naturally, in this case, the data members must have the status of open (pubic). After the pointer is initialized, it can be used to access the data of the object.
complexc (10.2,3.6); c / * pdat = 22.2; // the value of the re field of the object c has changed.
A pointer to a class component can be used as an actual parameter when calling a function. If pointers to the object and to the component are defined, then access to the component using the operation
'-> *'. pointer_to_object -> * pointer_to_component ''
Example 1.5.1
double (complex:: * pdat) = & complex:: re;
complex C (10.2,3.6);
complex * pcom = & C;
pcom -> * pdat = 22.2;
// You can determine the type of the pointer to the class data-components:
typedef double (complex :: * PDAT);
void f (complex c, PDAT pdat) {c. * pdat = 0;}
complex c;
PDAT pdat = & complex :: re; f (c, pdat);
pdat = & complex :: im; f (c, pdat);
Comments