Hi Alberto, I am a bit relunctant to implement this kind of interface in more classes (I know that it is in TFormula and some other classes). Passing a non const pointer as argument makes debugging more difficult in case, for example, the user provided array is not large enough. A solution where the array is created internally by the Get function is not a solution either because it confuses who is owning what. One could imagine more sophisticated solutions where a high level object, like TVector, STL vector is filled, but this is the door open to an infinity of prototypes in a class with the result that the interface looks more complex. At least, this is my view. May be a majority thinks differently. In this particular example with GetParErrors, why is the existing prototype not sufficient? Do you want to change the errors ? Rene Brun On Wed, 18 Sep 2002, Alberto Garcia Raboso wrote: > Hi ROOTers, > > In TFormula, the method GetParameters() is overloaded as > virtual Double_t* GetParameters() const > virtual void GetParameters(Double_t* params) > However, the method TF1::GetParErrors() has only one form > virtual Double_t* GetParErrors() const > > I find particularly useful the second prototype of GetParameters(), but > it doesn't exist for GetParErrors()... Is it intended or just an > oversight? > > Cheers, > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > Alberto Garcia Raboso > CERN / EP > CH-1211 Geneva 23, Switzerland > Office 40-2B-19 (+41 22 76 71626) > E-Mail: Alberto.Garcia.Raboso@cern.ch > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > Well, farewell, my hobbits! You should come safe to your own > homes now, and I shall not be kept awake for fear of your > peril. We will send word when we may, and some of us may yet > meet at times; but I fear that we shall not all be gathered > together ever again. > > The return of the King. J.R.R. Tolkien > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ >
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