bjoernager/rust
bjoernager/rust
1
Fork 0
Code Activity

add is_1zst helper method

Browse source
This commit is contained in:
Ralf Jung 2023-08-29 08:58:21 +02:00
parent a517049d8c
commit 0360b6740b
1 changed files with 10 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

10
compiler/rustc_abi/src/lib.rs
View file

@ -1660,15 +1660,25 @@ pub struct PointeeInfo {
impl LayoutS {
/// Returns `true` if the layout corresponds to an unsized type.
#[inline]
pub fn is_unsized(&self) -> bool {
self.abi.is_unsized()
}
#[inline]
pub fn is_sized(&self) -> bool {
self.abi.is_sized()
}
/// Returns `true` if the type is sized and a 1-ZST (meaning it has size 0 and alignment 1).
pub fn is_1zst(&self) -> bool {
self.is_sized() && self.size.bytes() == 0 && self.align.abi.bytes() == 1
}
/// Returns `true` if the type is a ZST and not unsized.
///
/// Note that this does *not* imply that the type is irrelevant for layout! It can still have
/// non-trivial alignment constraints. You probably want to use `is_1zst` instead.
pub fn is_zst(&self) -> bool {
match self.abi {
Abi::Scalar(_) | Abi::ScalarPair(..) | Abi::Vector { .. } => false,