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use core::{
fmt,
hash::{Hash, Hasher},
marker::PhantomData,
};
use crate::{Identifier, Init, OneShotIdentifier, Token, Trivial};
struct Invariant<T>(fn() -> *mut T);
pub struct Type<T> {
invariant: PhantomData<Invariant<T>>,
}
pub struct TypeToken<T> {
invariant: PhantomData<Invariant<T>>,
}
#[macro_export]
macro_rules! make_type_id {
() => {
unsafe { struct Anonomous; $crate::ty::Type::__internal_macro_new__(&Anonomous) }
};
(
$(#[$meta:meta])*
$v:vis let $name:ident;
) => {
$(#[$meta])*
#[allow(non_camel_case_types)]
$v struct $name {}
let $name = unsafe { $crate::ty::Type::__internal_macro_new__(&$name {}) };
};
(
$(#[$meta:meta])*
$v:vis static $name:ident;
) => {
$(#[$meta])*
#[allow(non_camel_case_types)]
$v struct $name {}
static $name: $crate::ty::Type<$name> = unsafe { $crate::ty::Type::__internal_macro_new__(&$name {}) };
};
}
impl<T> Default for TypeToken<T> {
fn default() -> Self { Self { invariant: PhantomData } }
}
impl<T> Type<T> {
#[doc(hidden)]
pub const unsafe fn __internal_macro_new__(_: &T) -> Self { Self::new_unchecked() }
pub const unsafe fn new_unchecked() -> Self { Self { invariant: PhantomData } }
#[inline]
pub const fn token(&self) -> TypeToken<T> { TypeToken::new() }
}
impl<T> TypeToken<T> {
pub const fn new() -> Self { Self { invariant: PhantomData } }
}
impl<T> Trivial for TypeToken<T> {}
unsafe impl<T> Token for TypeToken<T> {}
unsafe impl<T> OneShotIdentifier for Type<T> {}
unsafe impl<T> Identifier for Type<T> {
type Token = TypeToken<T>;
#[inline]
fn owns_token(&self, _: &Self::Token) -> bool { true }
#[inline]
fn token(&self) -> Self::Token { TypeToken::new() }
}
impl<T> Init for TypeToken<T> {
const INIT: Self = Self { invariant: PhantomData };
}
impl<T> fmt::Debug for TypeToken<T> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { write!(f, "TypeToken<{}>", core::any::type_name::<T>()) }
}
impl<T> Copy for TypeToken<T> {}
impl<T> Clone for TypeToken<T> {
fn clone(&self) -> Self { *self }
}
impl<T> Eq for TypeToken<T> {}
impl<T> PartialEq for TypeToken<T> {
fn eq(&self, _: &Self) -> bool { true }
}
impl<T> PartialOrd for TypeToken<T> {
fn partial_cmp(&self, _: &Self) -> Option<core::cmp::Ordering> { Some(core::cmp::Ordering::Equal) }
}
impl<T> Ord for TypeToken<T> {
fn cmp(&self, _: &Self) -> core::cmp::Ordering { core::cmp::Ordering::Equal }
}
impl<T> Hash for TypeToken<T> {
fn hash<H: Hasher>(&self, state: &mut H) { ().hash(state) }
}
impl<T> fmt::Debug for Type<T> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { write!(f, "Type<{}>", core::any::type_name::<T>()) }
}
impl<T> Eq for Type<T> {}
impl<T> PartialEq for Type<T> {
fn eq(&self, _: &Self) -> bool { true }
}
impl<T> PartialOrd for Type<T> {
fn partial_cmp(&self, _: &Self) -> Option<core::cmp::Ordering> { Some(core::cmp::Ordering::Equal) }
}
impl<T> Ord for Type<T> {
fn cmp(&self, _: &Self) -> core::cmp::Ordering { core::cmp::Ordering::Equal }
}
impl<T> Hash for Type<T> {
fn hash<H: Hasher>(&self, state: &mut H) { ().hash(state) }
}