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Rollup merge of #88340 - thomcc:c_size_t, r=joshtriplett

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Add `c_size_t` and `c_ssize_t` to `std::os::raw`.

Apparently these aren't guaranteed to be the same, and are merely "always the same in practice" (see https://rust-lang.zulipchat.com/#narrow/stream/136281-t-lang.2Fwg-unsafe-code-guidelines/topic/.60usize.60.20vs.20.60size_t.60).

This is a big footgun, but I suspect it can be alleviated if we expose this and start migrating people to it in advance of any platforms that ever have this as different.

I'll file a tracking issue after this gets some traction.
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Manish Goregaokar 2021-08-26 12:38:13 -07:00 committed by GitHub
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library/std/src/os/raw/mod.rs
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@ -151,3 +151,17 @@ macro_rules! type_alias {
#[stable(feature = "raw_os", since = "1.1.0")]
#[doc(no_inline)]
pub use core::ffi::c_void;
/// Equivalent to C's `size_t` type, from `stddef.h` (or `cstddef` for C++).
///
/// This type is currently always [`usize`], however in the future there may be
/// platforms where this is not the case.
#[unstable(feature = "c_size_t", issue = "88345")]
pub type c_size_t = usize;
/// Equivalent to C's `ssize_t` type, from `stddef.h` (or `cstddef` for C++).
///
/// This type is currently always [`isize`], however in the future there may be
/// platforms where this is not the case.
#[unstable(feature = "c_size_t", issue = "88345")]
pub type c_ssize_t = isize;