How can I use custom keys with std::map in C++11?

How can I use custom keys with std::map in C++11?

You can use custom keys in std::map by defining a custom comparator. Would you like an example?

Yes, please provide an example of a custom comparator.

Sure! Here's a simple example:

struct CustomKey {
    int id;
    std::string name;
};

struct CompareKeys {
    bool operator()(const CustomKey& a, const CustomKey& b) const {
        return a.id < b.id; // Compare based on id
    }
};

std::map<CustomKey, int, CompareKeys> myMap;

What if I want to compare based on the name instead of the id?

You can modify the comparator like this:

struct CompareKeys {
    bool operator()(const CustomKey& a, const CustomKey& b) const {
        return a.name < b.name; // Compare based on name
    }
};