generic-field-projection

This is a general purpose projection library that doesn't special case any pointer type except for raw pointers. This makes the UX for all smart pointers the same, and more consistent. (Even types you may not think of as pointers!)

This workspace is a proof of concept for the pointer to field concept discussed in this Rust Internals discussion, and the RFC.

Disclaimer: This workspace does not intend to be a fully fledged implementation, and will likely be missing many key features to making the pointer to field idea truly work.

Basic sketch of how this workspace works:

#[derive(Field)]     // This derive is given in the ptr-to-field-macro crate
struct Foo {
    pub names: String,
    bar: Bar,
}

let Foo = Foo::fields();

let foo = Foo { .. };
pin_utils::pin_mut!(foo);
let typsy::hlist_pat!(names, bar) = foo.project_all((
    unsafe { PinToPin::new(Foo.names) },
    unsafe { PinToPin::new(Foo.bar) }
));
let names: Pin<&mut String> = names;
let bar: Pin<&mut Bar> = bar;

Contributing

See CONTRIBUTING.md