Question

I would like to know if the following is allowed:

template < class C >
void function(C&);

void function() {
  class {} local;
  function(local);
}

thanks

Answer 1

It’s not allowed right now. But it’s supported in C++0x. The current Standard says at 14.3.1/2

A local type, a type with no linkage, an unnamed type or a type compounded from any of these types shall not be used as a template-argument for a template type-parameter.

That said, if the function is also local, there’s no problem

void f() {
  class L {} local;
  struct C {
    static void function(L &l) {
      // ...
    }
  };
  C::function(local);
}