RE: [ROOT] static map

From: Philippe Canal (pcanal@fnal.gov)
Date: Thu Aug 07 2003 - 17:27:27 MEST 

Hi Claus;

For a static object, you need to have an initialization.
So as you did:
   Int_t CError::count = 0;
you need to do
   std::map<std::string,Int_t> CError::messages;
This should not be located in the header file.

Cheers,
Philippe.

-----Original Message-----
From: owner-roottalk@pcroot.cern.ch
[mailto:owner-roottalk@pcroot.cern.ch]On Behalf Of Claus Horn
Sent: Thursday, August 07, 2003 3:07 AM
To: roottalk@pcroot.cern.ch
Subject: [ROOT] static map


Dear ROOTers,

I have the folowing class:
#include <map>
#include <string>
#include <TObject.h>
#include "TStyle.h"

class CError : public TObject {
public:
  CError() {};
  ~CError() {};
  inline void werf(string msg);
 
 private:
  static Int_t count; 
//static map<string,Int_t> messages;
  map<string,Int_t> messages;
 
 ClassDef(CError,0) 
};
Int_t CError::count = 0;

inline void CError::werf(string msg) {
    messages["hallo"] = 1;  // does only work in the non static case !
}

It works fine like this. But I wont to have the static map. Changing it 
to static results in:

CError_C.so: undefined symbol: _6CError.messages

What works for the integer does not seem to work for map.
Does anyone  have a solution for that?

Regards,
Claus Horn

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