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Sealing Noun Clone and Copy

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This commit is contained in:
Chris Allen 2024-12-06 19:12:01 -06:00
parent f9915a75ea
commit 49a0871434
1 changed files with 24 additions and 2 deletions
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26
rust/sword/src/noun.rs
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@ -1025,7 +1025,7 @@ impl fmt::Display for Allocated {
}
}
#[derive(Copy, Clone)]
// #[derive(Copy, Clone)]
#[repr(C)]
#[repr(packed(8))]
pub union Noun {
@ -1037,8 +1037,30 @@ pub union Noun {
allocated: Allocated,
}
// In the nock_stack crate
pub(crate) mod sealed_noun {
// Private marker trait that can only be implemented within this crate
pub(crate) trait Sealed {}
}
impl sealed_noun::Sealed for Noun {}
impl Clone for Noun
where
Self: sealed_noun::Sealed // This constraint makes Clone only usable within the crate
{
fn clone(&self) -> Self {
unsafe { Self::from_raw(self.raw) }
}
}
impl Copy for Noun
where
Self: sealed_noun::Sealed // This constraint makes Copy only usable within the crate
{}
impl Noun {
pub fn is_none(self) -> bool {
pub fn is_none(&self) -> bool {
unsafe { self.raw == u64::MAX }
}