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forward_list::reverse() in C++ STL - GeeksforGeeks

Last Updated : 30 Jun, 2023

std::forward_list::reverse() is an inbuilt function in CPP STL which reverses the order of the elements present in the forward_list.

Syntax:

forwardlist_name.reverse()

Parameter: The function does not accept any parameter.

Return value: The function has no return value. It reverses the forward list.

Below program demonstrates the above function:

Program 1: 

// C++ program to illustrate the 
// reverse() function 
#include <bits/stdc++.h> 
using namespace std; 

int main() 
{ 
    // initialising forward list 
    forward_list<int> forward = { 10, 20, 40, 30, 70 }; 

    cout << "List elements before performing reverse operation: "; 

    for (auto it = forward.begin(); it != forward.end(); ++it) 
        cout << *it << " "; 

    // Function that performs reverse operation 
    forward.reverse(); 

    // printing elements of list 
    cout << "\nList elements after performing reverse operation: "; 

    for (auto it = forward.begin(); it != forward.end(); ++it) 
        cout << *it << " "; 

    return 0; 
} 

List elements before performing reverse operation: 10 20 40 30 70 
List elements after performing reverse operation: 70 30 40 20 10

 Time Complexity: O(n)

Auxiliary Space: O(n)

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