How do I insert elements into a std::map in C++11?

How do I insert elements into a std::map in C++11?

In C++11, you can insert elements into a std::map using the insert() function or the subscript operator. Would you like examples?

Yes, please provide examples for both methods.

Sure! For insert(), you can do: std::map<int, std::string> myMap; myMap.insert(std::make_pair(1, "One"));

For the subscript operator: myMap[2] = "Two"; This will insert the key-value pair (2, "Two").

What happens if I insert a duplicate key?

If you insert a duplicate key, the std::map will not add a new entry; it will simply update the value associated with that key.

Can I use emplace instead of insert?

Yes, you can use emplace() to construct the element in place, which can be more efficient. For example: myMap.emplace(3, "Three"); This will insert the key-value pair (3, "Three").