Closed
Description
openedon Jan 6, 2015
The following code works:
pub fn new(delay: uint, callback: Box<FnMut() -> uint + 'a>, remove_on_drop: bool) -> Timer<'a> {
...
}But this doesn't:
pub fn new(delay: uint, callback: Box<(FnMut() -> uint) + 'a>, remove_on_drop: bool) -> Timer<'a> {
...
}rustc complains that
src/sdl2/timer.rs:33:43: 33:60 error: expected a path on the left-hand side of `+`, not `(FnMut() -> uint)` [E0178]
src/sdl2/timer.rs:33 pub fn new(delay: uint, callback: Box<(FnMut() -> uint) + 'a>, remove_on_drop: bool) -> Timer<'a> {
^~~~~~~~~~~~~~~~~
src/sdl2/timer.rs:33:43: 33:60 note: perhaps you forgot parentheses? (per RFC 438)
src/sdl2/timer.rs:33 pub fn new(delay: uint, callback: Box<(FnMut() -> uint) + 'a>, remove_on_drop: bool) -> Timer<'a> {
^~~~~~~~~~~~~~~~~
If I understand correctly the syntax is trait + lifetime, so I'd expect those parentheses to be fine (and imho they make the code more clear). The note about forgetting parentheses is also puzzling.
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment