Overloading increment and decrement operators in C++
Overloading ++/- – operators
Overloading Operator enhances the power of extensibility of C++.
It provides new meaning to most of the cplusplus operator.
Overloading increment and decrement operators in C++
- The operator that is overloaded is capable to provide special meaning to the user-defined data types as well.
- We can overload unary operators like ++,–etc to directly manipulate the object of a class
Syntax:
return_type::operator increment/decrementoperator_symbol(parameters)
{
// function definition
}Here operator is a keyword, increment/decrement operator symbol is the operator to be overloaded.
Overloading Prefix increment (++) operator
Run
#include <iostream>
using namespace std;
class test
{
private:
int i;
public:
test(): i(0) { }//initialise data memeber
void operator ++()
{
++i;
}
void display()
{
cout << "i:" << i << "\t";
}
};
int main()
{
test t;
// Displays the value of data member i for object t
t.display();
// Invoke the operator function void operator ++( )
++t;
// Displays the value of data member i for object t
t.display();
return 0;
}
Output
i:0 i:1
- Initially, when test t is declared, the value of data member i for object test t is 0 (constructor initializes i to 0).
- When ++ operator is called on the object t, operator function
void operator++( )is invoked which increments the value of data member i to 1.
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