Trait bevy_reflect::TupleStruct

source ·

pub trait TupleStruct: Reflect {
    // Required methods
    fn field(&self, index: usize) -> Option<&dyn Reflect>;
    fn field_mut(&mut self, index: usize) -> Option<&mut dyn Reflect>;
    fn field_len(&self) -> usize;
    fn iter_fields(&self) -> TupleStructFieldIter<'_> ⓘ;
    fn clone_dynamic(&self) -> DynamicTupleStruct;
}

Expand description

A trait used to power tuple struct-like operations via reflection.

This trait uses the Reflect trait to allow implementors to have their fields be dynamically addressed by index.

When using #[derive(Reflect)] on a tuple struct, this trait will be automatically implemented.

Example

use bevy_reflect::{Reflect, TupleStruct};

#[derive(Reflect)]
struct Foo(u32);

let foo = Foo(123);

assert_eq!(foo.field_len(), 1);

let field: &dyn Reflect = foo.field(0).unwrap();
assert_eq!(field.downcast_ref::<u32>(), Some(&123));