How do I find elements with custom comparators with std::set for embedded targets?

In C++, the `std::set` container can be utilized to store unique elements. When dealing with custom types, you may need to provide a custom comparator. This is especially useful in embedded systems where memory and performance are critical. Using a custom comparator allows you to define your own sorting logic for the elements within the set.

Here's how you can implement a `std::set` with a custom comparator in C++:

#include #include #include struct CustomComparator { bool operator() (const std::string &a, const std::string &b) const { return a.length() < b.length(); // Compare by length } }; int main() { std::set<:string customcomparator> mySet; mySet.insert("apple"); mySet.insert("banana"); mySet.insert("kiwi"); for (const auto &item : mySet) { std::cout << item << std::endl; // The output order will be based on string lengths } return 0; }

C++ std::set custom comparator embedded systems unique elements sorting logic performance memory optimization

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