1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
/// 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>()]; } }