C++ Deque Library - resize() Function

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Description

The C++ function std::deque::resize() changes the size of deque. 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 deque.

Declaration

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

#include <iostream>
#include <deque>

using namespace std;

int main(void) {

   deque<int> d;

   cout << "Initial size of deque = " << d.size() << endl;

   d.resize(5);

   cout << "Contents of deque after resize operaion are" << endl;

   for (int i = 0; i < d.size(); ++i)
      cout << d[i] << endl;

   return 0;
}

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

Initial size of deque = 0
Contents of deque after resize operaion are
0
0
0
0
0