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@sidepelican
Created December 29, 2019 15:09
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generics function overload
use std::marker::PhantomData;
struct T<A> {
_phantom: PhantomData<A>,
}
impl<U> T<&[U]> {
fn f(_: &[U]) {
println!("f(_: &[U])")
}
}
impl<U> T<&mut [U]> {
fn f(_: &mut [U]) {
println!("f(_: &mut [U])")
}
fn g(_: &mut [U]) {
println!("g(_: &mut [U])")
}
}
fn main() {
let a: &[u8] = &[1][..];
// T::f(a); // multiple applicable items in scope
// T::g(a); // mismatched types
let b: &mut [u8] = &mut [1][..];
// T::f(b); // multiple applicable items in scope
T::g(b);
}
@sidepelican
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l26の挙動から aT<&mut [U]>::f は呼べないだろうと思われ、l25は T<&[U]>::f で一意に解決できそうだけどそうはならなくて不思議

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