C++ Deque::operator>() Function

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The C++ std::deque::operator>() function is used to compare two deques lexicographically. It compares the elements sequentially, returning true if the first deque is greater than the second deque otherwise it returns false.

If the elements in the both the deques are equal, the shorter deque is considered smaller.

Syntax

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

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

Parameters

• lhs, rhs − It indicates the deque container.

Return value

It returns true if the condition holds, otherwise false.

Exceptions

This function never throws exception.

Time complexity

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

Example

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

#include <iostream>
#include <deque>
int main()
{
    std::deque<int> a = {1, 2, 3};
    std::deque<int> b = {1, 2, 1};
    if (a > b) {
        std::cout << "a is greater than b" << std::endl;
    } else {
        std::cout << "a is not greater than b" << std::endl;
    }
    return 0;
}

Output

Output of the above code is as follows −

a is greater than b

Example

Consider the following example, where we are going to compare the deques of different size.

#include <iostream>
#include <deque>
int main()
{
    std::deque<int> a = {1,2,3,4};
    std::deque<int> b = {1,2,3};
    if (a > b) {
        std::cout << "a is greater than b" << std::endl;
    } else {
        std::cout << "a is not greater than b" << std::endl;
    }
    return 0;
}

Output

Following is the output of the above code −

a is greater than b

Example

Let's look at the following example, where we are going to compare the deques of equal elements and observing the output.

#include <iostream>
#include <deque>
int main()
{
    std::deque<char> a = {'A','B','C'};
    std::deque<char> b = {'A','B','C'};
    if (a > b) {
        std::cout << "a is greater than b" << std::endl;
    } else {
        std::cout << "a is not greater than b" << std::endl;
    }
    return 0;
}

Output

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

a is not greater than b