C++ Deque Library - empty() Function


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Description

The C++ function std::deque::empty() Tests whether deque is empty of not. Deque of zero size is considered as empty.

Declaration

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

C++98

bool empty() const;

C++11

bool empty() const noexcept;

Parameters

None

Return value

Returns true if deque is empty otherwise false.

Exceptions

This member function never throws exception.

Time complexity

Constant i.e. O(1)

Example

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

#include <iostream>
#include <deque>

using namespace std;

int main(void) {

   deque<int> d;

   if (d.empty())
      cout << "Deque is empty." << endl;

   d.assign(1, 1);

   if (!d.empty())
      cout << "Deque is not empty." << endl;

   return 0;
}

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

Deque is empty.
Deque is not empty.
deque.htm
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