Overloading the Postfix Operator, ++ - C++ Class

C++ examples for Class:Operator Overload

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Description

Overloading the Postfix Operator, ++

Demo Code

                                                    
#include <iostream> 
                                                      
class Counter /*from w  w  w .  jav a  2  s . c o  m*/
{ 
public: 
    Counter(); 
    ~Counter(){} 
    int getValue() const { return value; } 
    void setValue(int x) { value = x; } 
    const Counter& operator++();   // prefix 
    const Counter operator++(int); // postfix 
                                                       
private: 
    int value; 
}; 
                                                       
Counter::Counter(): 
value(0) 
{} 
                                                     
const Counter& Counter::operator++() // prefix 
{ 
    ++value; 
    return *this; 
} 
                                                     
const Counter Counter::operator++(int) // postfix 
{ 
    Counter temp(*this); 
    ++value; 
    return temp; 
} 
                                                       
int main() 
{ 
    Counter c; 
    std::cout << "The value of c is " << c.getValue() << std::endl; 
    c++; 
    std::cout << "The value of c is " << c.getValue() << std::endl; 
    ++c; 
    std::cout << "The value of c is " << c.getValue() << std::endl; 
    Counter a = ++c; 
    std::cout << "The value of a: " << a.getValue(); 
    std::cout << " and c: " << c.getValue() << std::endl; 
    a = c++; 
    std::cout << "The value of a: " << a.getValue(); 
    std::cout << " and c: " << c.getValue() << std::endl; 
    return 0; 
}

Result


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