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

Finding elements in a std::map with custom comparators in C++ can be quite useful for embedded targets where memory and performance are critical. The std::map is ordered, and by providing a custom comparator, you can define how the keys are compared, which can be useful for complex data types or specific ordering needs.

In the following example, we create a std::map with a custom comparator that sorts string keys based on their length:

#include #include #include // Custom comparator to sort strings by length struct LengthComparator { bool operator()(const std::string &lhs, const std::string &rhs) const { return lhs.length() < rhs.length(); } }; int main() { // Create a map with the custom comparator std::map<:string int lengthcomparator> lengthMap; // Insert key-value pairs lengthMap["apple"] = 1; lengthMap["banana"] = 2; lengthMap["fig"] = 3; // Access elements for (const auto &pair : lengthMap) { std::cout << pair.first << ": " << pair.second << std::endl; } return 0; }

C++ std::map custom comparator embedded targets performance sorting

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