How does C++11 handle duplicate keys in std::map?

Can you explain how C++11 handles duplicate keys in std::map?

In C++11, std::map does not allow duplicate keys. If you try to insert a duplicate key, the existing value will be replaced.

What happens if I try to insert a duplicate key?

If you attempt to insert a duplicate key, the map will not add a new entry; instead, it will update the value associated with that key.

Is there a way to store multiple values for the same key?

To store multiple values for the same key, you can use std::multimap, which allows duplicate keys.

Can you give an example of using std::multimap?

Sure! Here's a simple example: you can create a multimap and insert multiple values for the same key like this:

std::multimap<int, std::string> mmap;
mmap.insert({1, "apple"});
mmap.insert({1, "banana"});

This way, both "apple" and "banana" are stored under the key 1.