C++ Deque Library - clear() Function

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Description

The C++ function std::deque::clear() destroys the deque by removing all elements from the deque and sets size of deque to zero.

Declaration

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

C++98

void clear();

C++11

void clear() noexcept;

Parameters

None

Return value

None

Exceptions

This member function never throws excpetion.

Time complexity

Linear i.e. O(n)

Example

The following example shows the usage of std::deque::clear() function.

#include <iostream>
#include <deque>

using namespace std;

int main(void) {

   deque<int> d = {1, 2, 3, 4, 5};

   cout << "Size of deque before clear operation = " << d.size() << endl;

   d.clear();

   cout << "Size of deque after clear operation = " << d.size() << endl;

   return 0;
}

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

Size of deque before clear operation = 5
Size of deque after clear operation = 0