Operator overloading

Feb 25, 2016Download as PPTX, PDF1 like2,340 views

Operator overloading allows operators like + and - to be used with custom class and struct types by defining them as methods. It overloads their original meaning for built-in types while retaining that functionality. Binary operators take two parameters while unary operators take one. Overloading improves code readability and makes operations on custom types look more natural. However, overloading is limited to certain predefined operators and cannot change properties like precedence.

OPERATOR OVERLOADING
Ramish Suleman
(IT)

Operator Overloading
Each C# operator has a predefined meaning. Most of them are given
additional meaning through the concept called operator overloading.
Main idea behind operator overloading is to use C# operators with the
class objects.
E.g.
‘+’ can be used to add 2 ints, floats and doubles, the same ‘+’ can be
used to add 2 class objects, thereby ‘+’ gets overloaded.
When an operator is overloaded, its original meaning is not lost.

Operator Overloading
Operator overloading can overload operators to work with class and
struct types.
Use keyword operator.
Follow with symbol
overload+
struct Point
{
int x;
int y;
public static Point operator+(Point p, Point q)
{
return new Point(p.x + q.x, p.y + q.y);
}
...
}

Using Overloaded Operator
Overloaded operator used like operators for other types.
Compiler translates into method call
use operator+
Point a = new Point(1, 2);
Point b = new Point(3, 4);
Point c = a + b;

Types of Operator Overloading
Binary Operators:
Binary operator works with two
parameters.
binary +
binary -
struct Point
{
int x;
int y;
public static Point operator+(Point p, Point q)
{
return new Point(p.x + q.x, p.y + q.y);
}
public static Point operator-(Point p, Point q)
{
return new Point(p.x - q.x, p.y - q.y);
}
...
}

Types of Operator Overloading
Unary Operators:
Unary operator works with single
parameter.
unary +
unary -
struct Point
{
int x;
int y;
public static Point operator+(Point p)
{
return new Point(p.x, p.y);
}
public static Point operator-(Point p)
{
return new Point(-p.x, -p.y);
}
...
}

Advantages of Operator Overloading
With operator overloading readability of the code improves.
With operator overloading the code becomes explicit in nature,
looking at the code, fellow developers can easily guess what is
going on.
With operator overloading the code looks more conventional and
becomes easy to follow.
The method defining operator overloading, should always be
static and public. Otherwise compiler error out with message
"User defined operator must always be static and public".

Limitations
Only some operators can be overloaded
Unary:
+ -! ~ ++ --true false
Binary:
+ -* / % & | ^ << >> == != > < >= <=
Cannot
o Create new operators.
o Change precedence.
o Change associativity.
o Change number of arguments.
o Overload prefix/postfix versions separately.

Summary
There are different ways in which operators may be overloaded
within C#. There are numerous ways that overloading can be used
to your advantage in custom classes and structs. It is now up to you
to decide how to best put it to use in your applications, and
important to remember that not all languages support operator
overloading.

Operator overloading allows user-defined types in C++ to behave similarly to built-in types when operators are used on them. It allows operators to have special meanings depending on the context. Some key points made in the document include: - Operator overloading enhances the extensibility of C++ by allowing user-defined types to work with operators like addition, subtraction, etc. - Common operators that can be overloaded include arithmetic operators, increment/decrement, input/output, function call, and subscript operators. - To overload an operator, a member or friend function is declared with the same name as the operator being overloaded. This function performs the desired operation on the class type. -

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Operator overloading

1. OPERATOR OVERLOADING Ramish Suleman (IT)

2. Operator Overloading Each C# operator has a predefined meaning. Most of them are given additional meaning through the concept called operator overloading. Main idea behind operator overloading is to use C# operators with the class objects. E.g. ‘+’ can be used to add 2 ints, floats and doubles, the same ‘+’ can be used to add 2 class objects, thereby ‘+’ gets overloaded. When an operator is overloaded, its original meaning is not lost.

3. Operator Overloading Operator overloading can overload operators to work with class and struct types. Use keyword operator. Follow with symbol overload+ struct Point { int x; int y; public static Point operator+(Point p, Point q) { return new Point(p.x + q.x, p.y + q.y); } ... }

4. Using Overloaded Operator Overloaded operator used like operators for other types. Compiler translates into method call use operator+ Point a = new Point(1, 2); Point b = new Point(3, 4); Point c = a + b;

5. Types of Operator Overloading Binary Operators: Binary operator works with two parameters. binary + binary - struct Point { int x; int y; public static Point operator+(Point p, Point q) { return new Point(p.x + q.x, p.y + q.y); } public static Point operator-(Point p, Point q) { return new Point(p.x - q.x, p.y - q.y); } ... }

6. Types of Operator Overloading Unary Operators: Unary operator works with single parameter. unary + unary - struct Point { int x; int y; public static Point operator+(Point p) { return new Point(p.x, p.y); } public static Point operator-(Point p) { return new Point(-p.x, -p.y); } ... }

7. Advantages of Operator Overloading With operator overloading readability of the code improves. With operator overloading the code becomes explicit in nature, looking at the code, fellow developers can easily guess what is going on. With operator overloading the code looks more conventional and becomes easy to follow. The method defining operator overloading, should always be static and public. Otherwise compiler error out with message "User defined operator must always be static and public".

8. Limitations Only some operators can be overloaded Unary: + -! ~ ++ --true false Binary: + -* / % & | ^ << >> == != > < >= <= Cannot o Create new operators. o Change precedence. o Change associativity. o Change number of arguments. o Overload prefix/postfix versions separately.

9. Summary There are different ways in which operators may be overloaded within C#. There are numerous ways that overloading can be used to your advantage in custom classes and structs. It is now up to you to decide how to best put it to use in your applications, and important to remember that not all languages support operator overloading.

Operator overloading

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Operator overloading