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

The C++ std::deque::operator>=() function is used to compare two deques lexicographically. The comparison countinues until one deque is found to be greater than the other deque. If a deque has a elements greater than or equalto the corresponding elements of the other deque, it returns true otherwise it returns false.

Following is the syntax for std::deque::.

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 operator>=() function.

#include <iostream>
#include <deque>
int main()
{
    std::deque<int> a = {10,12,23};
    std::deque<int> b = {01,12,23};
    if (a >= b) {
        std::cout << "a is greater than or equal to b." << std::endl;
    } else {
        std::cout << "a is not greater than or equal to b." << std::endl;
    }
    return 0;
}

Output of the above code is as follows −

a is greater than or equal to b.

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

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

Following is the output of the above code −

a is not greater than or equal to b.

Let's look at the following example, where we are going to fill deque with string and compare them.

#include <iostream>
#include <deque>
#include <string>
int main()
{
    std::deque<std::string> a = {"Ducati", "Cheron"};
    std::deque<std::string> b = {"Aston", "Lexus"};
    if (a >= b) {
        std::cout << "a is greater than or equal to b." << std::endl;
    } else {
        std::cout << "a is not greater than or equal to b." << std::endl;
    }
    return 0;
}

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

a is greater than or equal to b.

deque.htm

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