Branch of map in root tree

ROOT
1

Hello all,

I am trying to make branch of map in root tree.
The way I am doing is :

[code]std::map<std::string, int> *triggermap;
myTree->Branch(“triggermap”,“map<string,int>”,&triggermap);
triggermap = new std::map<string,int>;
triggermap->clear();

triggermap->insert(pair<string,int>(“is_HLT_Ele10_SW_L1R_event”,is_HLT_Ele10_SW_L1R_event));
triggermap->insert(pair<string,int>(“is_HLT_Ele15_SW_L1R_event”,is_HLT_Ele15_SW_L1R_event));
[/code]

And in mt .cc code I add the following lines :

#include <map> #ifdef __MAKECINT__ #pragma link C++ class map<string,int>+; #pragma link C++ class map<string,int>::iterator; #pragma link C++ class pair<string,int>; #endif

Now if I run the code I get the following error :

So even if I add the lines to generate the library, why is this error coming?
Could sombody please help me with th eerror ?

Thanks & Regards,
Shilpi

2

Hello,

I would like to add one more thing :
On one of the lxplus machines it worked with these lines.
But on the other it didn’t.
and I am using :
/afs/cern.ch/cms/sw/slc4_ia32_gcc345/lcg/root/5.22.00a-cms17/

Could anyone please tell me what needs to be done
so as to make this work on other machines as well?

Thanks,
Best Regards,
Shilpi

3

Hi,

you need to create the dictionary, see root.cern.ch/phpBB2/viewtopic.php?t=10029 Adding the pragma statements to your source is not sufficient.

Cheers, Axel.

4

Hello Axel,

Thanks much for the reply.
I tried that.
This is how my loader.C looks like :

#include <map> #ifdef __MAKECINT__ #pragma link C++ class map<string,int>; #pragma link C++ class map<string,int>::iterator; #pragma link C++ class pair<string,int>; #endif

I did :

but I get the following error :

Info in <TUnixSystem::ACLiC>: creating shared library /afs/cern.ch/user/s/shilpi/private/compile_files/cmssw314/treeBasedFiles/./loader_C.so Note: Link requested for already precompiled class map<string,int,less<string>,allocator<pair<const string,int> > > (ignore this message) :0: Note: Link requested for undefined class pair<string,int> (ignore this message) :0: Note: Link requested for already precompiled class map<string,int,less<string>,allocator<pair<const string,int> > >::iterator (ignore this message) :0: Error in <ACLiC>: Dictionary generation failed! Info in <ACLiC>: Invoking compiler to check macro's validity Info in <ACLiC>: The compiler has not found any problem with your macro. Probably your macro uses something rootcint can't parse. Check http://root.cern.ch/root/Cint.phtml?limitations for Cint's limitations.

Could you please tell me what is it that I missing?

Thanks,
Best Regards,
Shilpi

5

Hi,

You are problably just missing #include

Cheers,
Philippe.

6

Hello Philippe,

Thanks a lot.
I tried that. But its still giving me
the same error.

Best Regards,
Shilpi

7

Hi,

I can not reproduce your compilation error.

However map<string,int> is one of the container for which we provide a dictionary so just need to make sure that the interpreter see #include before passing a map to TTree::Branch. If your code is compiled just issue (literaly):gROOT->ProcessLine("#include <map>");(and add #include “TROOT.h”).

Cheers,
Philippe.

8

Hello Philippe,

Many thanks. That worked.

Best Regards,
Shilpi