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forward_list::reverse() in C++ STL

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  • Difficulty Level : Basic
  • Last Updated : 20 Jun, 2022
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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: 

CPP




// 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;
}


Output:

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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