| /// A simple static assertion macro. |
| #[macro_export] |
| #[allow_internal_unstable(type_ascription)] |
| macro_rules! static_assert { |
| ($test:expr) => { |
| // Use the bool to access an array such that if the bool is false, the access |
| // is out-of-bounds. |
| #[allow(dead_code)] |
| const _: () = [()][!($test: bool) as usize]; |
| }; |
| } |
| |
| /// Type size assertion. The first argument is a type and the second argument is its expected size. |
| #[macro_export] |
| macro_rules! static_assert_size { |
| ($ty:ty, $size:expr) => { |
| const _: [(); $size] = [(); ::std::mem::size_of::<$ty>()]; |
| }; |
| } |