Question

i have

Tree<std:string> tree;

now

new Tree<std:string>;

leads to a pointer,
how can i change address of tree to that of pointer generated by new?

Answer 1

Making C++ code look like Java is a bad idea, the two languages are very different.

That said, in C++ operator new returns a pointer to the allocated object.

Tree<std::string> * tree = new Tree<std::string>;
tree->do_something();

You can also bind a reference to your object.

Tree<std::string> & tree2 = *tree;
tree.do_something();

I urge you not to do that. Writing -> instead of . is not that difficult.