How do I use heterogeneous lookup with std::set?

Heterogeneous lookup in C++ allows a container like std::set to accept different types as lookup keys. This feature is particularly useful when you want to search through the set using various compatible types without explicitly defining a custom comparison function.

Here's an example demonstrating how to use heterogeneous lookup with std::set:

#include #include #include struct Compare { bool operator()(const std::string& lhs, const std::string& rhs) const { return lhs < rhs; } }; int main() { std::set<:string compare> mySet = { "apple", "banana", "cherry" }; // Heterogeneous lookup std::cout << (mySet.count("banana") ? "Found banana!" : "Banana not found!") << std::endl; std::cout << (mySet.count(std::string("cherry")) ? "Found cherry!" : "Cherry not found!") << std::endl; return 0; }

C++ std::set heterogeneous lookup container custom comparison

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