Lawrence Bethlenfalvy
09cfcb1839
I got very confused and started mucking about with "spawn" when in fact all I needed was the "inline" extension type in orcx that allows the interpreter to expose custom constants.
57 lines
1.9 KiB
Rust
57 lines
1.9 KiB
Rust
/// A type-level boolean suitable to select conditional trait implementations.
|
|
/// Implementors are [True] and [False]
|
|
pub trait TLBool {}
|
|
/// [TLBool] value of `true`. The opposite is [False]
|
|
pub struct TLTrue;
|
|
impl TLBool for TLTrue {}
|
|
/// [TLBool] value of `false`. The opposite is [True]
|
|
pub struct TLFalse;
|
|
impl TLBool for TLFalse {}
|
|
|
|
/// A type that implements [Extends] or a root. Used to select implementations
|
|
/// of traits on the hierarchy
|
|
pub trait InHierarchy: Clone {
|
|
/// Indicates that this hierarchy element is a leaf. Leaves can never have
|
|
/// children
|
|
type IsLeaf: TLBool;
|
|
/// Indicates that this hierarchy element is a root. Roots can never have
|
|
/// parents
|
|
type IsRoot: TLBool;
|
|
}
|
|
/// A type that derives from a parent type.
|
|
pub trait Extends: InHierarchy<IsRoot = TLFalse> + Into<Self::Parent> {
|
|
/// Specify the immediate parent of this type. This guides the
|
|
type Parent: InHierarchy<IsLeaf = TLFalse>
|
|
+ TryInto<Self>
|
|
+ UnderRootImpl<<Self::Parent as InHierarchy>::IsRoot>;
|
|
}
|
|
|
|
pub trait UnderRootImpl<IsRoot: TLBool>: Sized {
|
|
type __Root: UnderRoot<IsRoot = TLTrue, Root = Self::__Root>;
|
|
fn __into_root(self) -> Self::__Root;
|
|
}
|
|
|
|
pub trait UnderRoot: InHierarchy {
|
|
type Root: UnderRoot<IsRoot = TLTrue, Root = Self::Root>;
|
|
fn into_root(self) -> Self::Root;
|
|
}
|
|
|
|
impl<T: InHierarchy + UnderRootImpl<T::IsRoot>> UnderRoot for T {
|
|
type Root = <Self as UnderRootImpl<<Self as InHierarchy>::IsRoot>>::__Root;
|
|
fn into_root(self) -> Self::Root { self.__into_root() }
|
|
}
|
|
|
|
impl<T: InHierarchy<IsRoot = TLTrue>> UnderRootImpl<TLTrue> for T {
|
|
type __Root = Self;
|
|
fn __into_root(self) -> Self::__Root { self }
|
|
}
|
|
|
|
impl<T: InHierarchy<IsRoot = TLFalse> + Extends> UnderRootImpl<TLFalse> for T {
|
|
type __Root = <<Self as Extends>::Parent as UnderRootImpl<
|
|
<<Self as Extends>::Parent as InHierarchy>::IsRoot,
|
|
>>::__Root;
|
|
fn __into_root(self) -> Self::__Root {
|
|
<Self as Into<<Self as Extends>::Parent>>::into(self).into_root()
|
|
}
|
|
}
|