Issues with void function inside macro

[yus]

What is the difference between unnamed macro and named macro

_ROOT Version:16.04 _Platform:Ubuntu18.04 Compiler: Not Provided When I use a named macro to load a file which include a tree named DecayTree, then i process it, it prompt errors: the “DecayTree” is not defined. But if I use unnamed macro , the error will disappear and I can get the DecayTree. Why?