mirror of
https://github.com/rust-lang/rust-clippy
synced 2024-11-10 23:24:24 +00:00
b91dc03510
This lint detects calls to a `&self`-taking `as_ptr` method, where the result is then immediately cast to a `*mut T`. Code like this is probably invalid, as that pointer will not have write permissions, and `*mut T` is usually used to write through.
37 lines
994 B
Rust
37 lines
994 B
Rust
#![allow(unused)]
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#![warn(clippy::as_ptr_cast_mut)]
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#![allow(clippy::wrong_self_convention)]
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struct MutPtrWrapper(Vec<u8>);
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impl MutPtrWrapper {
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fn as_ptr(&mut self) -> *const u8 {
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self.0.as_mut_ptr() as *const u8
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}
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}
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struct Covariant<T>(*const T);
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impl<T> Covariant<T> {
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fn as_ptr(self) -> *const T {
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self.0
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}
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}
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fn main() {
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let mut string = String::new();
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let _ = string.as_ptr() as *mut u8;
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let _: *mut i8 = string.as_ptr() as *mut _;
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let _ = string.as_ptr() as *const i8;
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let _ = string.as_mut_ptr();
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let _ = string.as_mut_ptr() as *mut u8;
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let _ = string.as_mut_ptr() as *const u8;
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let nn = std::ptr::NonNull::new(4 as *mut u8).unwrap();
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let _ = nn.as_ptr() as *mut u8;
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let mut wrap = MutPtrWrapper(Vec::new());
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let _ = wrap.as_ptr() as *mut u8;
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let mut local = 4;
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let ref_with_write_perm = Covariant(std::ptr::addr_of_mut!(local) as *const _);
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let _ = ref_with_write_perm.as_ptr() as *mut u8;
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}
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