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

Solution with Boost.MultiIndex:

Live Coliru Demo

#include 
#include 
#include 
#include 

using namespace boost::multi_index;

struct IMidiMsgExt
{
  int mTick;
  int mTone;
};

using MidiSet=multi_index_container<
  IMidiMsgExt,
  indexed_by<
    ordered_unique>,
    hashed_non_unique>
  >
>;

#include 

int main()
{
  MidiSet m={{0,100},{2,60},{3,150},{5,60},{1,200},{4,90}};

  std::cout<<"before erasing:\n";
  for(const auto& msg:m)std::cout<<"["<().erase(60);

  std::cout<<"after erasing:\n";
  for(const auto& msg:m)std::cout<<"["<

Output

before erasing:
[0,100][1,200][2,60][3,150][4,90][5,60]
after erasing:
[0,100][1,200][3,150][4,90]