list empty() function in C++ STL

The list::empty() is a built-in function in C++ STL that is used to check whether a particular list container is empty or not. This function does not modify the list, it simply checks whether a list is empty or not, i.e. the size of the list is zero or not.

Syntax

list_name.empty() 

Parameters

• This function does not accept any parameter, it simply checks whether a list container is empty or not.

Return Value

• The return type of this function is boolean.
• It returns True is the size of the list container is zero otherwise it returns False.

Example

The below program illustrates the list::empty() function. 

Empty List
Not Empty

Time Complexity: O(1)
Space Complexity: O(1)

Note: This function works in constant time complexity.