4 ms·

“Anything with an explanation point is a macro invocation, by the way.” Can you explain what this means, exactly?

• deleted 6y ago
  [deleted]
• steveklabnik 6y ago
  This is a function invocation: foo(bar) This is a macro invocation: foo!(bar) It's done this way because macros can have much more complex things inside the ()s than functions can. This helps both humans and computers parse such things.
• lalaithion 6y ago
  foo(x, y, z) is a function. foo!(x, y, z) is a macro.
• deleted 6y ago
  [deleted]
• jack1243star 6y ago
  Not OP, I think they mean the exclamation mark (!)
  • ashtonkem 6y ago
    TIL that “exclamation point” is region specific. Exclamation mark sounds subtly wrong to my ear.
    • wtetzner 6y ago
      I thought the confusion was that you wrote "explanation point" instead of "exclamation point".
• gnosek 6y ago
  Exclamation mark. e.g. println!("hello, world"); or todo!(); are macro invocations.
• ccktlmazeltov 6y ago
  println!("something") that's a macro
• staticassertion 6y ago
  Macros: #[Foo] struct Bar {} baz!() cat!{} blah![]