Trait amplify::AsAny [−][src]
Expand description
Trait AsAny allows simple conversion of any type into a generic “thick”
pointer &dyn Any (see ::core::any::Any), that can be later converted
back to the original type with a graceful failing for all other conversions.
For simple conversions it is recommended to use #[derive(AsAny)] macro
from amplify_derive crate (see amplify_derive::AsAny).
Example
ⓘ
#[macro_use] extern crate amplify_derive; extern crate amplify; use amplify::AsAny; #[derive(AsAny, Copy, Clone, PartialEq, Eq, Debug)] struct Point { pub x: u64, pub y: u64, } #[derive(AsAny, PartialEq, Debug)] struct Circle { pub radius: f64, pub center: Point, } let mut point = Point { x: 1, y: 2 }; let point_ptr = point.as_any(); let mut circle = Circle { radius: 18., center: point, }; let circle_ptr = circle.as_any(); assert_eq!(point_ptr.downcast_ref(), Some(&point)); assert_eq!(circle_ptr.downcast_ref(), Some(&circle)); assert_eq!(circle_ptr.downcast_ref::<Point>(), None); let p = point_ptr.downcast_ref::<Point>().unwrap(); assert_eq!(p.x, 1)
Required methods
fn as_any(&self) -> &dyn Any[src]
Expand description
Returns thick pointer of &dyn Any type, that can be later downcasted
back to a reference of the original type.