forward_list resize() function in C++ STL

Last Updated : 20 Jun, 2022

The forward_list::resize() is an inbuilt function in C++ STL which changes the size of forward_list. If the given size is greater than the current size then new elements are inserted at the end of the forward_list. If the given size is smaller than current size then extra elements are destroyed. Syntax:

forwardlist_name.resize(n)

Parameter: The function accepts only one mandatory parameter n which specifies the new size of the forward list. Return value: The function does not return anything. Below programs illustrates the above function:

Program 1:

CPP

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

int main() 
{ 
    forward_list<int> fl = { 10, 20, 30, 40, 50 }; 

    // Prints the forward list elements 
    cout << "The contents of forward list :"; 
    for (auto it = fl.begin(); it != fl.end(); ++it) 
        cout << *it << " "; 

    cout << endl; 

    // resize to 7 
    fl.resize(7); 

    // // Prints the forward list elements after resize() 
    cout << "The contents of forward list :"; 
    for (auto it = fl.begin(); it != fl.end(); ++it) 
        cout << *it << " "; 

    return 0; 
}

Output:

The contents of forward list :10 20 30 40 50 
The contents of forward list :10 20 30 40 50 0 0

Program 2:

CPP

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

int main() 
{ 
    forward_list<int> fl = { 10, 20, 30, 40, 50 }; 

    // Prints the forward list elements 
    cout << "The contents of forward list :"; 
    for (auto it = fl.begin(); it != fl.end(); ++it) 
        cout << *it << " "; 

    cout << endl; 

    // resize to 3 
    fl.resize(3); 

    // Prints the forward list elements after resize() 
    cout << "The contents of forward list :"; 
    for (auto it = fl.begin(); it != fl.end(); ++it) 
        cout << *it << " "; 

    return 0; 
}

Output:

The contents of forward list :10 20 30 40 50 
The contents of forward list :10 20 30

Time Complexity: O(n)

Auxiliary Space: O(1)

forward_list::splice_after() in C++ STL

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