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Fix errors.

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This commit is contained in:
Stephen Chung
2022-02-06 23:02:59 +08:00
parent 1ccbda1050
commit becbfa8930
5 changed files with 49 additions and 33 deletions
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32
src/reify.rs
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@@ -1,13 +1,16 @@
/// Runs `$code` if `$old` is of type `$t`.
///
/// This macro is primarily used for type casting between known types.
#[macro_export]
macro_rules! reify {
($old:ident, |$new:ident : $t:ty| $code:expr, || $fallback:expr) => {{
#[allow(unused_imports)]
use ::std::{any::{Any, TypeId}, mem::{ManuallyDrop, transmute_copy}};
if TypeId::of::<$t>() == $old.type_id() {
use std::any::Any;
if std::any::TypeId::of::<$t>() == $old.type_id() {
// SAFETY: This is safe because we check to make sure the two types are
// actually the same type.
let $new: $t = unsafe { transmute_copy(&ManuallyDrop::new($old)) };
let $new: $t = unsafe { std::mem::transmute_copy(&std::mem::ManuallyDrop::new($old)) };
$code
} else {
$fallback
@@ -15,12 +18,29 @@ macro_rules! reify {
}};
($old:expr, |$new:ident : $t:ty| $code:expr, || $fallback:expr) => {{
let old = $old;
reify!(old, |$new : $t| $code, || $fallback)
reify!(old, |$new: $t| $code, || $fallback)
}};
($old:ident, |$new:ident : $t:ty| $code:expr) => {
reify!($old, |$new : $t| $code, || ())
reify!($old, |$new: $t| $code, || ())
};
($old:expr, |$new:ident : $t:ty| $code:expr) => {
reify!($old, |$new : $t| $code, || ())
reify!($old, |$new: $t| $code, || ())
};
}
#[macro_export]
macro_rules! reify_dynamic {
($old:ident, |$new:ident : $t:ty| $code:expr) => {{
#[allow(unused_imports)]
use ::std::{
any::{Any, TypeId},
mem::{transmute_copy, ManuallyDrop},
};
if TypeId::of::<$t>() == TypeId::of::<crate::Dynamic>() {
// SAFETY: This is safe because we check to make sure the two types are
// actually the same type.
let $new: $t = unsafe { transmute_copy(&ManuallyDrop::new($old)) };
$code
}
}};
}