Hi Dirk,
this is fixed now in the development version. The GetName() method for
the TMap helper class TAssoc was not implemented. Thanks for reporting
this inconsistency.
Cheers, Fons.
Dirk Meier wrote:
>
> Hi,
>
> here I tried to use TMap to store pairs of keys and values.
> The FindObject(Text_t *) does not work in the example below.
> Do I use it wrong ?
>
> Later, I am planning to use TObjNum as the value in
> the TMap (that is a number inheriting from TObject, see
> http://root.cern.ch/root/html/examples/tcollex.C.html).
> Is there a reason why TObjNum is not part of root's classes?
> Is there a better why to realize maps between numbers
> and strings (keywords) than using TMap ?
>
> thanks for your help
>
> Dirk
>
> Example (also as attachment):
>
> {
>
> #include <iostream>
>
> TObjString *s1 = new TObjString("Alpha");
> TObjString *s2 = new TObjString("Beta");
>
> TMap *aMap = new TMap();
>
> aMap->Add((TObject*)s1, (TObject*)s2);
>
> cout << aMap->GetValue(s1)->GetName() << endl;
>
> cout << "o.k., this was correct ... now try retrival using the keyname : " << endl;
>
> cout << aMap->FindObject("Alpha")->GetName() << endl;
>
> cout << "the FindObject method returns null pointer ???? Why ??" << endl;
>
> }
>
> here the output:
>
> *******************************************
> * *
> * W E L C O M E to R O O T *
> * *
> * Version 2.21/01 14 January 1999 *
> * *
> * You are welcome to visit our Web site *
> * http://root.cern.ch *
> * *
> *******************************************
>
> FreeType Engine v1.1 used to render TrueType fonts.
>
> CINT/ROOT C/C++ Interpreter version 5.13.83, Dec 2 1998
> Type ? for help. Commands must be C++ statements.
> Enclose multiple statements between { }.
> root [0] .x aTMapTester.C
> Beta
> o.k., this was correct ... now try retrival using the keyname :
> Error: illegal pointer to class object FindObject("Alpha") 0x0 3
> FILE:/home/dime/cc/prj/RawRead/./aTMapTester.C LINE:19
> *** Interpreter error recovered ***
> root [1]
>
> --------------------------------------------------------------------------------
>
> // aTMapTester.C
>
> {
>
> #include <iostream>
>
> TObjString *s1 = new TObjString("Alpha");
> TObjString *s2 = new TObjString("Beta");
>
> TMap *aMap = new TMap();
>
> aMap->Add((TObject*)s1, (TObject*)s2);
>
> cout << aMap->GetValue(s1)->GetName() << endl;
>
> cout << "o.k., this was correct ... now try retrival using the keyname : " << endl;
>
> cout << aMap->FindObject("Alpha")->GetName() << endl;
>
> cout << "the FindObject method returns null pointer ???? Why ??" << endl;
>
> }
--
Org: CERN, European Laboratory for Particle Physics.
Mail: 1211 Geneve 23, Switzerland
E-Mail: Fons.Rademakers@cern.ch Phone: +41 22 7679248
WWW: http://root.cern.ch/~rdm/ Fax: +41 22 7677910
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