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ptr::offset, Spell out the units used for the offset argument #11002

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ptr::offset, Spell out the units used for the offset argument #11002

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6 changes: 5 additions & 1 deletion src/libstd/ptr.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -21,14 +21,18 @@ use util::swap;

#[cfg(not(test))] use cmp::{Eq, Ord};

/// Calculate the offset from a pointer
/// Calculate the offset from a pointer.
/// The `count` argument is in units of T; e.g. a `count` of 3
/// represents a pointer offset of `3 * sizeof::<T>()` bytes.
#[inline]
pub unsafe fn offset<T>(ptr: *T, count: int) -> *T {
intrinsics::offset(ptr, count)
}

/// Calculate the offset from a mut pointer. The count *must* be in bounds or
/// otherwise the loads of this address are undefined.
/// The `count` argument is in units of T; e.g. a `count` of 3
/// represents a pointer offset of `3 * sizeof::<T>()` bytes.
#[inline]
pub unsafe fn mut_offset<T>(ptr: *mut T, count: int) -> *mut T {
intrinsics::offset(ptr as *T, count) as *mut T
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