[Solved] Count occurrences by object id in std::multimap [closed]

Question

But it doesn’t works, il only returns 1 and there are at least 2
objects in my map that have same id

It’s a std::map. You cannot have two objects with the same key, and I assume you’re trying to use the m_id filed of O as your key. Try using std::multimap instead.

And, to count the number of items, use map::count() (which for std::map can only return one or zero!)

Accepted Answer

But it doesn’t works, il only returns 1 and there are at least 2
objects in my map that have same id

It’s a std::map. You cannot have two objects with the same key, and I assume you’re trying to use the m_id filed of O as your key. Try using std::multimap instead.

And, to count the number of items, use map::count() (which for std::map can only return one or zero!)