Typedef of anonymous class

Question

Is there any difference in any aspect (syntactic limitation, performance, etc.) between the following two definitions?

using Foo = struct { int a, b, c; };

struct Foo { int a, b, c; };

(I'm asking because the first form is aesthetically more uniform when put among a lot of using declarations.)

EDIT: The post linked to in the comment doesn't exactly answer my question. I'm more concerned about how the above two definitions differ in terms of usage, whereas that post mainly answers how they are different in terms of, well, what they are, I think.

Answer 1

Here are some differences I can think of:

• (obvious) You can't declare any constructors, a destructor, or an assignment operator for an unnamed class.
• You can't forward-declare an unnamed class, including as a friend of another class.
• You can't mark an unnamed class final.
• struct Foo can be declared in the same declarative region as a function or variable named Foo, although, obviously, you shouldn't do this. using Foo = ... does not allow you this freedom.