How can I set two kind of comparator (one for insert, one for find) on this multiset?

Question

I have declared this STL multiset:

multiset playingNotes;

and my comparator is:

Answer 1

Use std::find_if.

int value = 60;
auto iteratorItemFound = std::find_if(std::begin(playingNotes), std::end(playingNotes), [value](const IMidiMsgExt& msg)
{
    return msg.mNote == value;
});