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C++ set swap()

C++ swap() function is used to swap (or exchange) the content of two sets but both the sets must be of same type although sizes may differ.

Syntax

Parameter

x: set container to exchange the contents with.

Return value

None

Complexity

Constant.

Iterator validity

All references, iterators and pointers referring to elements in both set containers remain valid, but now are referring to elements in the other set container, and iterate in it.

Data Races

Both the container and x are modified.

Exception Safety

No effect on container if exception is thrown.

Example 1

Let's see the simple example to swap the element of one set to another:

Output:

Set contains following elements
1
2
3
4
5

In the above example, set m1 has five elements and m2 is empty. When you swap m1 to m2 then all the elements of m1 is swapped to m2.

Example 2

Let's see a simple example to exchange the content of two sets:

Output:

first set contains: 40 50 60
second set contains: 10 20 30

Example 3

Let's see a simple example to swap the contents of two sets:

Output:

set1:
	x
	y
	z
set2:
	a
	b
	c
	d

In the above example, another form of swap() function is used to swap the contents of two sets.

Example 4

Let's see a simple example:

Output:

The original set s1 is: 10 20 30.
After swapping with s2, list s1 is: 100 200.
After swapping with s3, list s1 is: 300.





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