Hi Thomas,
You must make an implicit loop on the objects in the array. You should not
assume
that the objects are consecutive.
Note that, like for any Root collection, you can do:
TClonesArray *a1; //your source array
TClonesArray *a2 = (TClonesArray*)a1->Clone();
Rene Brun
Thomas Bretz wrote:
>
> Dear all,
>
> I want to copy a TClonesArray from array1 to array2:
>
> class MyClass:public TObject { public: Double_t d; };
>
> TClonesArray a1("MyClass", 20);
> TClonesArray a2("MyClass", 10);
>
> // call "new (a1[i]) MyClass;" for all entries in a1 and a2
>
> Is it enough to do:
> a2.ExpandCreate(a1.GetEntriesFast());
> memcpy(&a2, &a1, sizeof(a1));
>
> or must I do something like:
> const Int_t n = a1.GetEntriesFast();
> a2.InitSize(n);
> for (int i=0; i<n; i++)
> a2.d = a1.d;
>
> BTW: MyClass contains plain values (basic data types) _only_.
>
> Thanks in advance,
> Thomas.
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