C++ List Library - resize() Function

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Description

The C++ function std::list::resize() changes the size of list. If n is smaller than current size then extra elements are destroyed. If n is greater than current container size then new elements are inserted at the end of list.

Declaration

Following is the declaration for std::list::resize() function form std::list header.

C++11

void resize (size_type n);

Parameters

n − Number of element to be inserted.

Return value

None

Exceptions

If reallocation fails then bad_alloc exception is thrown.

Time complexity

Linear i.e. O(n)

Example

The following example shows the usage of std::list::resize() function.

#include <iostream>
#include <list>

using namespace std;

int main(void) {
   list<int> l;

   cout << "Initial size of list = " << l.size() << endl;

   l.resize(5);

   cout << "Size of list after resize operation = " << l.size() << endl;

   cout << "List contains following elements" << endl;

   for (auto it = l.begin(); it != l.end(); ++it)
      cout << *it << endl;

   return 0;
}

Let us compile and run the above program, this will produce the following result −

Initial size of list = 0
Size of list after resize operation = 5
List contains following elements
0
0
0
0
0