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C++ Deque::operator<=() Function

The C++ std::deque::operator<=() function is used to compare two deques lexicographically. It returns true if the first deque is lexicographically less than or equal to the second deque otherwise it returns false. The comparison starts from the beginning of the deque and stops as soon as a difference is found.

Following is the syntax for std::deque::operator<=() function.

bool operator<= (const deque<T,Alloc>& lhs, const deque<T,Alloc>& rhs);

• lhs, rhs − It indicates the deque container.

It returns true if the condition holds, otherwise false.

This function never throws exception.

The time complexity of this function is Linear i.e. O(n)

In the following example, we are going to consider the basic usage of the operator<=() function.

#include <deque>
#include <iostream>
int main()
{
    std::deque<int> a = {1, 2};
    std::deque<int> b = {1, 2, 3};
    if (a <= b) {
        std::cout << "a is less than or equal to b" << std::endl;
    } else {
        std::cout << "a is greater than b" << std::endl;
    }
}

Output of the above code is as follows −

a is less than or equal to b

Consider the following example, where we are going to assign() to add elements to the deque and comparing them.

#include <deque>
#include <iostream>
int main()
{
    std::deque<int> a = {1, 2};
    std::deque<int> b = {1, 2, 3};
    b.assign(3,1);
    if (a <= b) {
        std::cout << "a is less than or equal to b" << std::endl;
    } else {
        std::cout << "a is greater than b" << std::endl;
    }
}

Following is the output of the above code −

a is greater than b

Let's look at the following example, where we are going to consider the deque with char and comparing them.

#include <deque>
#include <iostream>
int main()
{
    std::deque<char> a = {'A', 'B', 'C'};
    std::deque<char> b = {'D', 'E', 'F'};
    if (a <= b) {
        std::cout << "a is less than or equal to b" << std::endl;
    } else {
        std::cout << "a is greater than b" << std::endl;
    }
}

If we run the above code it will generate the following output −

a is less than or equal to b

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