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trait Base { fn base_method(&self) { println!("this is Base"); } } trait Bar: Base { fn bar_method(&self) { println!("this is Bar"); } } impl Base for u8 {} impl Bar for u8 {} impl Base for i32 {} impl Bar for i32 {} // use register to store vpointer fn test_dyn(a: &dyn Base, b: &dyn Base) { a.base_method(); b.base_method(); } // use stack storage to store vpointer due to type esrasure fn test_dyn_ret(a: &dyn Base) -> &dyn Base { a.base_method(); a } pub fn gui() { // no need to store vpointer for x in current scope // since compiler knows where to fetch the const vpointer value let x: u8 = 1; let y: i32 = 2; test_dyn(&x, &y); // type erased, compiler needs to store it to stack let foo = test_dyn_ret(&y); foo.base_method(); }
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