Gary Guo b44becc5ee rust: macros: add #[vtable] proc macro ... This procedural macro attribute provides a simple way to declare a trait with a set of operations that later users can partially implement, providing compile-time `HAS_*` boolean associated constants that indicate whether a particular operation was overridden. This is useful as the Rust counterpart to structs like `file_operations` where some pointers may be `NULL`, indicating an operation is not provided. For instance: #[vtable] trait Operations { fn read(...) -> Result<usize> { Err(EINVAL) } fn write(...) -> Result<usize> { Err(EINVAL) } } #[vtable] impl Operations for S { fn read(...) -> Result<usize> { ... } } assert_eq!(<S as Operations>::HAS_READ, true); assert_eq!(<S as Operations>::HAS_WRITE, false); Signed-off-by: Gary Guo <gary@garyguo.net> Reviewed-by: Sergio González Collado <sergio.collado@gmail.com> [Reworded, adapted for upstream and applied latest changes] Signed-off-by: Miguel Ojeda <ojeda@kernel.org>		2022-12-04 01:59:15 +01:00
..
allocator.rs
error.rs
lib.rs
prelude.rs	rust: macros: add #[vtable] proc macro	2022-12-04 01:59:15 +01:00
print.rs	rust: print: add pr_cont! macro	2022-12-01 20:12:44 +01:00
str.rs