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| author |  Héctor Ramón Jiménez <hector0193@gmail.com> | 2020-10-17 08:10:30 +0200 |
|---|---|---|
| committer | Héctor Ramón Jiménez <hector0193@gmail.com> | 2020-10-17 08:10:30 +0200 |
| commit | d7a5e5445561fb1bdfd1a6904b20750f29dd71fd (patch) | |
| tree | 0255f294ce03a71c543617271bab3f32ea33b211 /examples/tour/src | |
| parent | 17f0db57c3be440642a057e0a53106fcecdf4564 (diff) | |
| download | iced-d7a5e5445561fb1bdfd1a6904b20750f29dd71fd.tar.gz iced-d7a5e5445561fb1bdfd1a6904b20750f29dd71fd.tar.bz2 iced-d7a5e5445561fb1bdfd1a6904b20750f29dd71fd.zip | |
Require `Clone` for `Message` early when needed
Prior to this change, the widgets that needed a `Clone` bound on `Message` to
implement the `Widget` trait could be created with a non-cloneable `Message`.
As a consequence, the compiler complained only when actually trying to use the
`Widget` trait. Normally, this happens when trying to `push` the widget in a
container or turn it into an `Element`.
Furthermore, the compiler error in this case does not mention `Message` nor the
`Clone` bound, but instead complains about a missing `From` implementation.
Thus, it can easily cause confusion!
This change introduces `Clone` bounds in the main implementation of the
widgets that need it to properly implement the `Widget` trait. As a
result, the compiler complains early when trying to create one of these widgets
with a non-cloneable `Message` and explicitly mentions that the `Message` needs
to implement `Clone`.
Diffstat (limited to 'examples/tour/src')
| -rw-r--r-- | examples/tour/src/main.rs | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/examples/tour/src/main.rs b/examples/tour/src/main.rs index ec464801..560d67e2 100644 --- a/examples/tour/src/main.rs +++ b/examples/tour/src/main.rs @@ -689,7 +689,7 @@ fn ferris<'a>(width: u16) -> Container<'a, StepMessage> { .center_x() } -fn button<'a, Message>( +fn button<'a, Message: Clone>( state: &'a mut button::State, label: &str, ) -> Button<'a, Message> { |