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rust: static_assert: add
static_assert!
macro
Add the `static_assert!` macro, which is a compile-time assert, similar to the C11 `_Static_assert` and C++11 `static_assert` declarations [1,2]. Do so in a new module, called `static_assert`. For instance: static_assert!(42 > 24); static_assert!(core::mem::size_of::<u8>() == 1); const X: &[u8] = b"bar"; static_assert!(X[1] == b'a'); const fn f(x: i32) -> i32 { x + 2 } static_assert!(f(40) == 42); Link: https://en.cppreference.com/w/c/language/_Static_assert [1] Link: https://en.cppreference.com/w/cpp/language/static_assert [2] Co-developed-by: Alex Gaynor <[email protected]> Signed-off-by: Alex Gaynor <[email protected]> Signed-off-by: Miguel Ojeda <[email protected]>
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// SPDX-License-Identifier: GPL-2.0 | ||
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//! Static assert. | ||
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/// Static assert (i.e. compile-time assert). | ||
/// | ||
/// Similar to C11 [`_Static_assert`] and C++11 [`static_assert`]. | ||
/// | ||
/// The feature may be added to Rust in the future: see [RFC 2790]. | ||
/// | ||
/// [`_Static_assert`]: https://en.cppreference.com/w/c/language/_Static_assert | ||
/// [`static_assert`]: https://en.cppreference.com/w/cpp/language/static_assert | ||
/// [RFC 2790]: https://github.com/rust-lang/rfcs/issues/2790 | ||
/// | ||
/// # Examples | ||
/// | ||
/// ``` | ||
/// static_assert!(42 > 24); | ||
/// static_assert!(core::mem::size_of::<u8>() == 1); | ||
/// | ||
/// const X: &[u8] = b"bar"; | ||
/// static_assert!(X[1] == b'a'); | ||
/// | ||
/// const fn f(x: i32) -> i32 { | ||
/// x + 2 | ||
/// } | ||
/// static_assert!(f(40) == 42); | ||
/// ``` | ||
#[macro_export] | ||
macro_rules! static_assert { | ||
($condition:expr) => { | ||
const _: () = core::assert!($condition); | ||
}; | ||
} |