bjoernager/rust
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Specialize PartialEq for Option<newtype>

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This commit is contained in:
clubby789 2022-10-27 13:43:26 +01:00
parent 8e8fd02b27
commit 20f2d8b841
19 changed files with 44 additions and 0 deletions
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26
compiler/rustc_macros/src/newtype.rs
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@ -192,6 +192,30 @@ impl Parse for Newtype {
}
}
};
let spec_partial_eq_impl = if let Lit::Int(max) = &max {
if let Ok(max_val) = max.base10_parse::<u32>() {
quote! {
impl core::option::SpecOptionPartialEq for #name {
#[inline]
fn eq(l: &Option<Self>, r: &Option<Self>) -> bool {
if #max_val < u32::MAX {
l.map(|i| i.private).unwrap_or(#max_val+1) == r.map(|i| i.private).unwrap_or(#max_val+1)
} else {
match (l, r) {
(Some(l), Some(r)) => r == l,
(None, None) => true,
_ => false
}
}
}
}
}
} else {
quote! {}
}
} else {
quote! {}
};
Ok(Self(quote! {
#(#attrs)*
@ -293,6 +317,8 @@ impl Parse for Newtype {
#step
#spec_partial_eq_impl
impl From<#name> for u32 {
#[inline]
fn from(v: #name) -> u32 {