Hi Rooters, For const-correctness, there should be some fixes in TArray* and TObjArray. 1) At() should be defined as const in all the TArray* routines. In TObjArray, it is more of a design decision but IMHO there should be two versions. One version would return a const TObject * and be const, the other returning a TObject * and being non-const. 2) operator[] should have two versions in all these classes. One verion should return the reference and be non-const. The second should return a reference to a const whatever and be const. In TObjArray this ought to be (IMHO): const TObject * const & operator[](int) const; // or const TObject * operator[](int) const; also works. TObject *& operator[](int); Also, Class() should be const in every class in ROOT. George Heintzelman
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