Filling a TH2D in map(pair<int, int>,TH2D)

ROOT
2

Why not use pointers and avoid the copy constructors?

#include <iostream>
#include <map>

#include <TH2D.h>

void test(){
  const double tdcmin = -850, tdcmax = -350;
  const int ntdcbins = 250;

  std::map<pair<int, int>, TH2D*> myMap;  
  
  for (int i = 1; i<=47; i=i+2) {
    myMap[std::make_pair(i,i+1)] = new TH2D (Form("t%d_vs_t%d",i,i+1), 
       Form("t%d_vs_t%d",i,i+1),ntdcbins, tdcmin, tdcmax, ntdcbins, tdcmin, tdcmax);
  }
  
  for(map<pair<int, int>, TH2D*>::const_iterator it = myMap.begin(); it != myMap.end(); ++it) {
    std::cout << it->first.first << " " << it->first.second << " " << it->second->GetTitle() << "\n"; 
  }
  map<pair<int, int>, TH2D*>::const_iterator res;
  res = myMap.find( std::make_pair(1,2) );
  if(res != myMap.end()) {
    res->second->Fill(1.,2.); 
   cout << res->second->GetTitle() << "\n"; 
  }  
}

EDIT @behrenhoff explains what is happening below.