Check out example codes for "what is time complexity of swap function". It will help you in understanding the concepts better.

Code Example 1

The Behaviour is Equivalent to: 

template <class T> void swap ( T& a, T& b )
  T c(a); a=b; b=c;

Syntax : Swap(a,b) // a = Number 1 , b = Number 2

Time Complexity: It makes one constructions and one assignments
				 So, Linear O(n) time.

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