A crate that allows you to mostly-safely cast one type into another type.

Related tags

Command-line unty
Overview

A crate that allows you to mostly-safely cast one type into another type.

This is mostly useful for generic functions, e.g.

pub fn foo<S>(s: S) {
    if let Ok(a) = unsafe { unty::<S, u8>(s) } {
        println!("It is an u8 with value {a}");
    } else {
        println!("it is not an u8");
    }
}
foo(10u8); // will print "it is an u8"
foo("test"); // will print "it is not an u8"

This operation is still unsafe because it allows you to extend lifetimes. There currently is not a way to prevent this

if let Ok(str) = unsafe { unty::<&'a str, &'static str>(input) } {
    // the compiler may now light your PC on fire
}

License

This crate is dual licenced MIT and Apache-2.0, at your own leisure

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Comments
  • Fix read from invalidated ptr

    Fix read from invalidated ptr

    The original code is UB because mem::forget(x) moves x. x is no longer located at the address pointed to by ptr. Anything else might already have been written to the original location before ptr::read runs. For example the stack frame of either mem::forget or ptr::read might partially overlap with the original location of x.

    opened by dtolnay 1
  • Missing Apache 2 license

    Missing Apache 2 license

    According to the Cargo.toml metadata and readme, the crate is dual licensed "MIT OR Apache-2.0", but only an MIT license is currently present in the repo.

    https://github.com/bincode-org/unty/blob/2f2379c90595d4bcbe9244e9a9bbbb6cfaac611c/Cargo.toml#L6

    https://github.com/bincode-org/unty/blob/2f2379c90595d4bcbe9244e9a9bbbb6cfaac611c/README.md#L27

    As far as I understand it, the Apache 2.0 license requires that you distribute the license text together with the sources: "You must give any other recipients of the Work or Derivative Works a copy of this License".

    opened by dtolnay 1
Owner
Bincode
Bincode
GitHub
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