mirror of
https://github.com/rust-lang/rust-clippy
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31 lines
1 KiB
Rust
31 lines
1 KiB
Rust
//! Test casts for alignment issues
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#![feature(rustc_private)]
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extern crate libc;
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#[warn(clippy::cast_ptr_alignment)]
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#[allow(clippy::no_effect, clippy::unnecessary_operation, clippy::cast_lossless)]
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fn main() {
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/* These should be warned against */
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// cast to more-strictly-aligned type
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(&1u8 as *const u8) as *const u16;
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(&mut 1u8 as *mut u8) as *mut u16;
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// cast to more-strictly-aligned type, but with the `pointer::cast` function.
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(&1u8 as *const u8).cast::<u16>();
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(&mut 1u8 as *mut u8).cast::<u16>();
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/* These should be ok */
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// not a pointer type
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1u8 as u16;
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// cast to less-strictly-aligned type
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(&1u16 as *const u16) as *const u8;
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(&mut 1u16 as *mut u16) as *mut u8;
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// For c_void, we should trust the user. See #2677
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(&1u32 as *const u32 as *const std::os::raw::c_void) as *const u32;
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(&1u32 as *const u32 as *const libc::c_void) as *const u32;
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// For ZST, we should trust the user. See #4256
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(&1u32 as *const u32 as *const ()) as *const u32;
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}
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