Can I know the usefulness of the ‘this’ pointer?

Whenever an object of a class is created, a pointer to the current object is held by the ‘this’ pointer. The this pointer exists for all non-static members of a class- the static members do not have a ‘this’ pointer associated with them. Each object maintains its own set of data members, but all objects of a class share a single set of methods.

A single copy of each method exists within the machine code that is the output of compilation and linking. The compiler uses the "this" pointer to internally reference the data members of a particular object. So if there are more than one object of a class type within an application, we need to be able to interact with the right object’s members- compiler inserts implicitly code that calls a object reference with the this pointer.

class Vehicle
{
	Int Registration = 0;
public:
	Vehicle(){}
	Virtual void GetRegistration() = 0;
	Void SetRegistration(int);
};
Void SetRegistration(int regis)
{
    this->Registration = regis;
}

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