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use disjoint_impls::disjoint_impls;
pub trait Dispatch {
type Group;
}
pub trait Dispatch2 {
type Group;
}
pub enum GroupA {}
impl Dispatch for String {
type Group = GroupA;
}
impl Dispatch2 for String {
type Group = GroupA;
}
impl<T> Dispatch for Vec<T> {
type Group = GroupA;
}
impl<T> Dispatch2 for Vec<T> {
type Group = GroupA;
}
pub enum GroupB {}
impl Dispatch for i32 {
type Group = GroupB;
}
impl Dispatch2 for i32 {
type Group = GroupA;
}
impl Dispatch for u32 {
type Group = GroupB;
}
impl Dispatch2 for u32 {
type Group = GroupA;
}
impl Dispatch2 for (u32,) {
type Group = GroupB;
}
disjoint_impls! {
pub trait Kita {
const NAME: &'static str;
}
impl<T: Dispatch<Group = GroupA>> Kita for T
where
T: Dispatch2<Group = GroupA>,
{
const NAME: &'static str = "Blanket A";
}
impl<U: Dispatch<Group = GroupB>> Kita for U
where
U: Dispatch2<Group = GroupA>,
{
const NAME: &'static str = "Blanket B";
}
impl<U> Kita for (U,)
where
(U,): Dispatch2<Group = GroupB>,
{
const NAME: &'static str = "Blanket C";
}
}
/*
pub trait Kita {
const NAME: &'static str;
}
const _: () = {
pub trait Kita0<_TŠČ0: ?core::marker::Sized>: Kita {
const NAME_šč: &'static str;
}
impl<U> Kita0<GroupB> for (U,)
where
(U,): Dispatch2<Group = GroupB>,
{
const NAME_šč: &'static str = "Blanket C";
}
pub trait Kita00<_TŠČ0: ?core::marker::Sized>: Kita {
const NAME_šč: &'static str;
}
impl<T: Dispatch<Group = GroupA>> Kita00<GroupA> for T
where
T: Dispatch2<Group = GroupA>,
{
const NAME_šč: &'static str = "Blanket A";
}
impl<U: Dispatch<Group = GroupB>> Kita00<GroupB> for U
where
U: Dispatch2<Group = GroupA>,
{
const NAME_šč: &'static str = "Blanket B";
}
impl<_TŠČ0> Kita0<GroupA> for _TŠČ0
where
_TŠČ0: Dispatch,
Self: for<'_dšč> Kita00<<_TŠČ0 as Dispatch>::Group>,
{
const NAME_šč: &'static str = <Self as Kita00<
<_TŠČ0 as Dispatch>::Group,
>>::NAME_šč;
}
impl<_TŠČ0> Kita for _TŠČ0
where
_TŠČ0: Dispatch2,
Self: for<'_dšč> Kita0<<_TŠČ0 as Dispatch2>::Group>,
{
const NAME: &'static str = <Self as Kita0<
<_TŠČ0 as Dispatch2>::Group,
>>::NAME_šč;
}
};
*/
#[test]
fn overlapping_common_group() {
assert_eq!("Blanket A", String::NAME);
assert_eq!("Blanket A", Vec::<u32>::NAME);
assert_eq!("Blanket B", i32::NAME);
assert_eq!("Blanket B", u32::NAME);
assert_eq!("Blanket C", <(u32,)>::NAME);
}