C++ - Forward List reverse() Function

The C++ forward_list::reverse function is used to reverse the order of elements of the forward_list container.

Syntax

C++11

void reverse() noexcept;

Parameters

No parameter is required.

Return Value

None.

Time Complexity

Linear i.e, Θ(n).

Example:

In the below example, the forward_list::reverse function is used reverse the order of elements of the forward_list called f_list.

#include <iostream>
#include <forward_list>
using namespace std;
 
int main (){
  forward_list<int> f_list{10, 20, 30, 40, 50};
  forward_list<int>::iterator it;

  cout<<"f_list contains: ";
  for(it = f_list.begin(); it != f_list.end(); it++)
    cout<<*it<<" ";

  //Reverse the order of all elements of f_list
  f_list.reverse();
  
  cout<<"\nf_list contains: ";
  for(it = f_list.begin(); it != f_list.end(); it++)
    cout<<*it<<" ";

  return 0;
}

The output of the above code will be:

f_list contains: 10 20 30 40 50 
f_list contains: 50 40 30 20 10

❮ C++ - Forward List