Hi Rene,
thanks, but I can assume (simple because I know it) that the objects are
consecutive. It is like I wrote it: The destination array is already
allocated, but maybe with the wrong size. I want to transfer the
contents of the source array into this array. Clone doesn't help here...
Thomas.
Rene Brun wrote:
> 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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