Hi John, Before written ClassA, use a dummy TRef to reference it, ClassA* a = new ClassA(); a->Set(123); TRef dummy = a; // this will do the job Rene Brun On Wed, 7 Jan 2004, John Pretz wrote: > Hello everybody. > > I'm trying out TRef and I ran into the following problem: > I have a class ClassA and a class ClassB. ClassB has a TRef to ClassA. I > want to write them both to disk. I do it two possible ways. One works. > The other doesn't. > If I > 1.) Create ClassA > 2.) Create ClassB > 3.) Make ClassB::fTRef point to ClassA > 4.) Write ClassA and ClassB to file > alls well, and I can read them both back in just fine. > > If however, I do this: > 1.) Create ClassA > 2.) Write ClassA to file > 3.) Create ClassB and make it's TRef point to ClassA > 4.) Write ClassB to file > I read in ClassA and ClassB only to find that ClassB's TRef points to 0. > > Is there a way to make this work for me? I would really like to be able > to write ClassA to file before even creating the object that will point to > it. I hunted around on this list's archives and couldn't find any > solutions. > > I included some code. Just 'make' should compile all the code and run my > problem scripts. (I'm using ROOT 3.10.02 on a RedHat 9 machine) > > Thanks in advance. > > John > >
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