Unary operator overloading

Md.Ashraful Islam,CSE 2/1,DUET
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Unary Operator
Overloading(Prefix)

Content
 why we are using operator Overloading
 Defining unary operator Overloading.
 General format operator Overloading.
 Example of unary ++/-- operator Overloading(prefix)
with code analysis.
 Example of unary - operator Overloading.

Generalization of function
overloading
Adding multiple object0202
Extension of language to
include user-defined types
.
04
Readable code

One of the Exciting
Fetures of c++
Works only on the
single variable.
Can be overloaded 2 ways:
Static member function
& Friend function
-,++,-- those are unary
operator Which
we can overload.
Unary
Operator
Overloading

Operator overloading
format
keywordAny type Operator symbol
returnType operator*(parameters)
Example:
void operator ++();

Unary ++/-- operator overloading(prefix).
#include <iostream>
using namespace std;
class Check{
private:
int x;
public:
Check(int a) { x=a; }
void Display(){
cout<<“value of x is = " << x << endl;
}
void operator ++() {
x += 1;
}
void operator --() {
x -= 1;
}
};
int main(){
Check obj(5);
obj.Display();
++obj;
obj.Display();
cout<<“when decrementing”<<endl;
--obj;
obj.Display();
return 0;
}
output
Value of x is = 5
Value of x is = 6
Value of x is = 5
Output
Value of x is = 5 //initial value
Value of x is = 6// incrementing 1
Value of x is = 5//decrementing 1
Constructor
++ operator
overloaded
-- operator
overloaded

Overloading outside the class with *this pointer
Md.Ashraful Islam,CSE 2/1,DUET.
#include <iostream>
class Check{
private:
int x;
public:
void Display(){
cout<<“value of x is = " << x <endl;
}
Check operator ++();
Check operator --() ;
};
Check Check:: operator ++() {
x +=1; }
Check Check:: operator --() {
x -=1; }
int main(){
Check obj(5);
obj.Display();
++obj;
obj.Display();
cout<<“when decrementing”<<endl;
--obj;
obj.Display();
return 0;
}
Output
Value of x is = 5
Value of x is = 6
Value of x is = 5
When using
return type there a
simple change occure.
int operator ++() { x += 1;
return *this;
}
int operator --() { x -= 1;
return *this;
}
Using
*this
pointer

#include <iostream>
class Check{
private:
int x;
public:
void Display() {
cout<<“value of x is = " << x <endl;
}
Void operator -() {
x =-x ;
} ;
int main(){
Check obj(5);
obj.Display();
-obj;
obj.Display();
obj.Display();
return 0;
}
Output
Value of x is = 5
Value of x is = -5
Output
Value of x is = 5//initial value
Value of x is = -5//overloaded value
Calling
overloaded
operator
Value
initialize
- Operator
overloading
Unary – operator overloading

Thank You For
Watching.
Md.Ashraful Islam,CSE 2/1,DUET.

Unary operator overloading

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