Hi Christian, Yes, when clearing the pad, the graph will be deleted if its bit kCanDelete is set. Rene Brun On Mon, 2 Dec 2002, cstrato wrote: > Dear Rene > > Thank you, does this mean that in the following code > fragment, graph will be deleted by TPad? > TGraph *graph = 0; > for (Int_t i=0; i<m; i++) { > graph = new TGraph(n, x, y); > graph->SetBit(kCanDelete); > graph->Draw(opt); > } > > Best regards > Christian > > > > > Rene Brun wrote: > > > Hi Christian, > > > > I suggest to read the chapter on "Object Ownership", page 107 > > of the ROOT Users Guide. > > > > When you do > > graph->DrawGraph(n, x, y, opt); > > DrawGraph creates a copy of the graph and sets its bit kCanDelete. > > When clearing the pad, objects with the kCanDelete bit set are > > automatically deleted. In your case, I suggest to do: > > TGraph graph; //will be automatically delete when leaving scope > > for (Int_t i=0; i<m; i++) { > > graph.DrawGraph(n, x, y, opt); //newgraph=new TGraph() > > } > > > > Rene Brun > > > > > > On Sat, 30 Nov 2002, cstrato wrote: > > > > > >>Dear Rooters > >> > >>In the following code, no graph is drawn if I delete graph: > >> TGraph *graph = 0; > >> for (Int_t i=0; i<m; i++) { > >> graph = new TGraph(n, x, y); > >> graph->Draw(opt); > >> SafeDelete(graph); //<== not possible > >> } > >> > >>However, in this code I can delete graph because DrawGraph > >>creates a new graph "newgraph": > >> TGraph *graph = 0; > >> for (Int_t i=0; i<m; i++) { > >> graph = new TGraph(n, index, x); > >> graph->DrawGraph(n, x, y, opt); //newgraph=new TGraph() > >> SafeDelete(graph); > >> } > >> > >>I understand that root takes care of deleting TGraph objects, > >>but is this also the case when I create a standalone program > >>or does there exist a memory leak? > >> > >> > >>Thank you in advance for your help. > >> > >>Best regards > >>Christian > >>_._._._._._._._._._._._._._._._ > >>C.h.i.s.t.i.a.n S.t.r.a.t.o.w.a > >>V.i.e.n.n.a A.u.s.t.r.i.a > >>_._._._._._._._._._._._._._._._ > >> > >> > >> > > > > > > > >
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