Hi Reiner,
since recently (last two releases) the copy ctor of the
TCollection base class has been made private. This to prevent
unexpected behaviour in case people pass (by accident or ignorance)
a collection by value or embed them in classes without implementing
a proper copy ctor. What happens in the case below is that rootcint
generates always a default copy ctor in case there is not one
defined in the class. A default copy ctor tries to call the copy
ctor of all embedded objects, so also of the TList. However, the TList
has no public copy ctor so you get a compile error. To prevent
this just add a empty copy ctor to the class (so rootcint will
not generate one) and things work fine. See below for the one line
change.
Empty copy ctor:
private:
MultiLineGraph(const MultiLineGraph &);
to prevent people from accidentally using it, omit the implementation
and you will get a link error.
Cheers, Fons.
ROHLFS Reiner wrote:
>
> Hi Rooters,
>
> please have a look to these files:
>
> MultiLineGraph.h:
> ------------------------------------------------
> #include "TGraph.h"
> #include "TList.h"
>
> class MultiLineGraph : public TGraph
> {
> ClassDef(MultiLineGraph, 1)
> TList m_lineDesList;
> };
> ------------------------------------------------
>
> and MLGLinkDef.h
> ------------------------------------------------
> #ifdef __CINT__
>
> #pragma link off all globals;
> #pragma link off all classes;
> #pragma link off all functions;
>
> #pragma link C++ class MultiLineGraph;
>
> #endif
> ------------------------------------------------
>
> I create the file mgl_lib.cpp with this command:
> rootcint -f mgl_lib.cpp -c MultiLineGraph.h MLGLinkDef.h
>
> and now I try to compile it with this command:
> CC -g -I/isdc/software/root/include -c mgl_lib.cpp
>
> But I get this error message:
> "mgl_lib.cpp", line 94: Error: TCollection::TCollection(const TCollection&) is
> not accessible from TSeqCollection::TSeqCollection(TSeqCollection&).
> 1 Error(s) detected.
> *** Error code 1
> make: Fatal error: Command failed for target `mgl_lib.o'
> Exit 1
>
> With Version Sun/Solaris for SPARC 1.03/07 everything worked fine. But with
> version 1.03/09 I'm not able to compile this file.
>
> Cheers Reiner.
--
Org: CERN, European Laboratory for Particle Physics.
Mail: 1211 Geneve 23, Switzerland Phone: +41 22 7679248
E-Mail: Fons.Rademakers@cern.ch Fax: +41 22 7677910
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