How do I customize hashing and equality with std::priority_queue?

In C++, the `std::priority_queue` does not provide an option to customize the hashing and equality checks directly because it is intended for maintaining a collection of elements based on priority rather than performing hashing or equality checks. However, you can customize its behavior to some extent by providing your own comparison function or functor.

When you want to customize the ordering of elements in a priority queue, you can use a comparator that defines how two elements are compared to determine their priority.

Here’s an example of customizing a priority queue using a custom comparator:


        #include 
        #include 
        #include 

        // Custom comparator for the priority queue
        struct CustomComparator {
            bool operator()(const int &lhs, const int &rhs) {
                // Prioritize larger integers
                return lhs < rhs;
            }
        };

        int main() {
            // Create a priority queue with the custom comparator
            std::priority_queue, CustomComparator> pq;

            // Insert elements into the priority queue
            pq.push(10);
            pq.push(30);
            pq.push(20);

            // Output elements based on priority
            while (!pq.empty()) {
                std::cout << pq.top() << " ";
                pq.pop();
            }

            return 0;
        }

How do I customize hashing and equality with std::priority_queue?

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How do I customize hashing and equality with std::priority_queue?

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