Static and this

For class or object: Static...

To avoid data replication some attributes are shared between instances, using static.

Class attributes/variables :

Class methods :

Instance attributes/variables :

Instance methods :

We only have one copy of each function in a class.
The this pointer holds the memory address of the current object that is using the function.
The this pointer is automatically supplied when you call a non-static member function of a class:
- For example, clerk.displayValues();
  .. is actually displayValues(&clerk);
The actual argument list used by the compiler for displayValues() is displayValues(Employee *this).

Why do you need the bracket?
Because this is a pointer, this.employeeIdNum isn’t and the “.” would take precedence over the *.

Above is another way of accessing a field of a class.

Below we use this to automatically identify context.

In the previous example we used the -> operator (pointer-to-member operator) to access member functions of the entity at a particular address, as specified by a pointer.
(*this).number and this->number are equivalent.

In general for a pointer X we have (*X).x and X->x.

Page updated

Google Sites

Report abuse