How do I find elements with custom comparators with std::set in performance-sensitive code?

In C++, you can utilize custom comparators with std::set to control how elements are ordered and how duplicates are handled. This can be especially useful in performance-sensitive applications where the default ordering does not meet your requirements.

The following example demonstrates how to create a std::set that uses a custom comparator to store integers and ensures that they are sorted in descending order.

#include <iostream> #include <set> // Custom comparator that sorts integers in descending order struct DescendingComparator { bool operator()(const int& lhs, const int& rhs) const { return lhs > rhs; // Change the comparison to `>` for descending order } }; int main() { std::set<int, DescendingComparator> mySet; mySet.insert(5); mySet.insert(3); mySet.insert(8); mySet.insert(1); std::cout << "Elements in the set in descending order: " << std::endl; for (const int& num : mySet) { std::cout << num << " "; } return 0; }

C++ std::set custom comparator performance-sensitive code descending order sorting STL

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