std::string::empty() in C++

The std::string::empty() function in C++ is a predefined member function of the std::string class template. This function is used to check if a string is empty, i.e., whether its length is 0 or not, and returns a boolean value true if the string is empty otherwise, it returns false.

Syntax of String empty()

stringObj.empty();

Here, stringObj is the name of the string object.

Parameters of std::string::empty()

The std::string::empty() function does not take any parameters.

Return Value of string::empty()

The return value of the std::string::empty() tells us whether the string is empty or not.

• It returns true if the string length is 0, otherwise,
• It returns false.

Example of std::string::empty() in C++

Input:
str1="GeeksforGeeks 
str2=""

Output: 
str1 is not empty
str2 is empty

The below example illustrates how we can use an empty() function to check if the given string is empty or not in C++.

str1 is not empty
str2 is empty

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