Std::map iterator issue

[Fan_RadMod]

Please provide the following information:

---

ROOT Version (e.g. 5.34/36):
Platform, compiler (e.g. lxplus):

---

Trying to use std:map in my script by following the example outlined in this post:

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

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…

However it looks like this example code is not working on lxplus with root version 5.34/36:

…
ROOT 5.34/36 (heads/v5-34-00-patches@v5-34-34-76-g57bae4c, Apr 08 2016, 12:05:00 on linuxx8664gcc)

CINT/ROOT C/C++ Interpreter version 5.18.00, July 2, 2010
Type ? for help. Commands must be C++ statements.
Enclose multiple statements between { }.
root [0]
Processing root_test.cc…
Error: Symbol it is not defined in current scope root_test.cc:17:
Error: Failed to evaluate it->first
Error: Failed to evaluate it->first.first
Error: << Illegal operator for pointer 3 root_test.cc:17:
Error: Symbol it is not defined in current scope root_test.cc:17:
Error: Failed to evaluate it->first
Error: Failed to evaluate it->first.second
Error: << Illegal operator for pointer 3 root_test.cc:17:
Error: Symbol it is not defined in current scope root_test.cc:17:
Error: Failed to evaluate it->second
Error: Failed to evaluate it->second->GetTitle()
Error: << Illegal operator for pointer 3 root_test.cc:17:
*** Interpreter error recovered ***

[Wile_E_Coyote]

With ROOT 5 you will probably need to use this macro as precompiled only, i.e. via ACLiC. Try:

root root_test.cc++

[Fan_RadMod]

root root_test.cc++ works fine,thanks!