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Add a raw pointer iterator #91390

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Add a raw pointer iterator #91390

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3aeff65
Add a raw pointer iterator
dtolnay Nov 30, 2021
b60be1a
Add ui test of iterating a pointer range
dtolnay Nov 30, 2021
36ba887
Add rustc_on_unimplemented for Step on pointers
dtolnay Nov 30, 2021
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7 changes: 7 additions & 0 deletions compiler/rustc_trait_selection/src/traits/error_reporting/on_unimplemented.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -202,6 +202,13 @@ impl<'a, 'tcx> InferCtxtExt<'tcx> for InferCtxt<'a, 'tcx> {
flags.push((sym::_Self, Some("{integral}".to_owned())));
}

if let ty::RawPtr(ptr) = self_ty.kind() {
let string = match ptr.mutbl {
hir::Mutability::Mut => "*mut T",
hir::Mutability::Not => "*const T",
};
flags.push((sym::_Self, Some(string.to_owned())));
}
if let ty::Array(aty, len) = self_ty.kind() {
flags.push((sym::_Self, Some("[]".to_owned())));
flags.push((sym::_Self, Some(format!("[{}]", aty))));
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4 changes: 4 additions & 0 deletions library/core/src/iter/range.rs
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Expand Up @@ -21,6 +21,10 @@ unsafe_impl_trusted_step![char i8 i16 i32 i64 i128 isize u8 u16 u32 u64 u128 usi
/// The *successor* operation moves towards values that compare greater.
/// The *predecessor* operation moves towards values that compare lesser.
#[unstable(feature = "step_trait", reason = "recently redesigned", issue = "42168")]
#[rustc_on_unimplemented(
on(_Self = "*const T", label = "use core::ptr::IterConst to iterate a range of pointers"),
on(_Self = "*mut T", label = "use core::ptr::IterMut to iterate a range of pointers")
)]
pub trait Step: Clone + PartialOrd + Sized {
/// Returns the number of *successor* steps required to get from `start` to `end`.
///
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