Forward List in C++ | Set 2 (Manipulating Functions)

Forward List in C++ | Set 1 (Introduction and Important Functions) More functions are discussed in this article Some of the operations other than insertions and deletions that can be used in forward lists are as follows : 

1. merge() :- This function is used to merge one forward list with other. If both the lists are sorted then the resultant list returned is also sorted. 

2. operator "=" :- This operator copies one forward list into other. The copy made in this case is deep copy. 

Output:

The contents of 2nd forward list after copy are : 1 2 3 
The contents of forward list after merge are : 1 1 2 2 3 3 

Time Complexity: O(1)

Auxiliary Space: O(1)
 3. sort() :- This function is used to sort the forward list. 

4. unique() :- This function deletes the multiple occurrences of a number and returns a forward list with unique elements. The forward list should be sorted for this function to execute successfully. 

Output:

The contents of forward list after sorting are : 1 1 2 2 3 3 3 
The contents of forward list after unique operation are : 1 2 3 

Time Complexity: O(1)

Auxiliary Space: O(1)
 

5. reverse() :- This function is used to reverse the forward list.

6. swap() :- This function swaps the content of one forward list with other. 

Output:

The contents of forward list after reversing are : 3 2 1 

The contents of 1st forward list before swapping are : 3 2 1 
The contents of 2nd forward list before swapping are : 4 5 6 
The contents of 1st forward list after swapping are : 4 5 6 
The contents of 2nd forward list after swapping are : 3 2 1 

Time Complexity: O(1)

Auxiliary Space: O(1)
 

7. clear() :- This function clears the contents of forward list. After this function, the forward list becomes empty.

 8. empty() :- This function returns true if the list is empty otherwise false. 

Output:

The contents of forward list are : 1 2 3 
The contents of forward list after clearing are : 
Forward list is empty

Time Complexity: O(1)

Auxiliary Space: O(1)
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