Lookup of dependent names in C++ template instantiation

Question

When I try to compile this code

// void foobar(int); 

template 
struct Foo {
  void bar(T t) { foobar(t); };
};

void foobar(int);

template clas         


        

Answer 1

Phase two lookup only includes name lookup rules that can't be applied in phase one- ADL, for example. Two-phase lookup is exactly that- some names are looked up in phase one, and some are looked up in phase two. This particular kind of name is a phase one name, as the compiler is perfectly capable of looking for foobar in the namespace(s) of the function during phase one.

Visual C++ does not implement two-phase name lookup.