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)
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