Deque operators [C++ Reference]
Keywords: stl,deque,deque_operators
Date: 2009-10-09T04:35:09-0700

## Deque operators

Syntax:

        #include <deque>
        TYPE& operator[]( size_type index );
        const TYPE& operator[]( size_type index ) const;
        deque& operator=(const deque& c2);
        bool operator==(const deque& c1, const deque& c2);
        bool operator!=(const deque& c1, const deque& c2);
        bool operator<(const deque& c1, const deque& c2);
        bool operator>(const deque& c1, const deque& c2);
        bool operator<=(const deque& c1, const deque& c2);
        bool operator>=(const deque& c1, const deque& c2);

All of the C++ containers can be compared and assigned with the standard comparison operators: ==, !=, ⇐, >=, <, >, and =. Individual elements of a deque can be examined with the [] operator.

Performing a comparison or assigning one deque to another takes linear time.

The [] operator runs in constant time.

Two deques are equal if:

1. Their size is the same, and
2. Each member in location i in one deque is equal to the the member in location i in the other deque.

Comparisons among deques are done lexicographically.

For example, the following code uses the [] operator to access all of the elements of a deque:

       deque<int> dq( 5, 1 );
       for( size_t i = 0; i < dq.size(); i++ ) {
         cout << "Element " << i << " is " << dq[i] << '\n';
       }

Related Topics: at