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Showing content from https://www.tutorialspoint.com/cpp_standard_library/cpp_deque_default_constructor.htm below:

C++ Deque Library - deque() Function

The C++ default constructor std::deque::deque() constructs an empty deque with zero element. Storage requirement for this container is fulfilled by internal allocator.

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

explicit deque (const allocator_type& alloc = allocator_type());

explicit deque (const allocator_type& alloc = allocator_type());

alloc − The allocator object.

Constructor never returns value.

This member function never throws exception.

Constant i.e. O(1)

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

#include <iostream>
#include <deque>

using namespace std;

int main(void) {

   deque<int> d;

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

   return 0;
}

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

Size of deque = 0

deque.htm

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