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Add a comment explaining the (()) idiom for empty structs.

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This commit is contained in:
Dan Gohman 2022-04-13 14:32:17 -07:00
parent f934043c17
commit 890125d73e
1 changed files with 2 additions and 0 deletions
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library/std/src/os/windows/io/handle.rs
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@ -220,6 +220,7 @@ impl TryFrom<HandleOrInvalid> for OwnedHandle {
/// This is the error type used by [`HandleOrNull`] when attempting to convert
/// into a handle, to indicate that the value is null.
// The empty field prevents constructing this, and allows extending it in the future.
#[unstable(feature = "io_safety", issue = "87074")]
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct NullHandleError(());
@ -237,6 +238,7 @@ impl crate::error::Error for NullHandleError {}
/// This is the error type used by [`HandleOrInvalid`] when attempting to
/// convert into a handle, to indicate that the value is
/// `INVALID_HANDLE_VALUE`.
// The empty field prevents constructing this, and allows extending it in the future.
#[unstable(feature = "io_safety", issue = "87074")]
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct InvalidHandleError(());