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ef9e37973c
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 <alex.gaynor@gmail.com>
Signed-off-by: Alex Gaynor <alex.gaynor@gmail.com>
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
34 lines
879 B
Rust
34 lines
879 B
Rust
// SPDX-License-Identifier: GPL-2.0
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//! Static assert.
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/// Static assert (i.e. compile-time assert).
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///
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/// Similar to C11 [`_Static_assert`] and C++11 [`static_assert`].
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///
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/// The feature may be added to Rust in the future: see [RFC 2790].
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///
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/// [`_Static_assert`]: https://en.cppreference.com/w/c/language/_Static_assert
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/// [`static_assert`]: https://en.cppreference.com/w/cpp/language/static_assert
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/// [RFC 2790]: https://github.com/rust-lang/rfcs/issues/2790
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///
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/// # Examples
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///
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/// ```
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/// static_assert!(42 > 24);
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/// static_assert!(core::mem::size_of::<u8>() == 1);
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///
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/// const X: &[u8] = b"bar";
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/// static_assert!(X[1] == b'a');
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///
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/// const fn f(x: i32) -> i32 {
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/// x + 2
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/// }
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/// static_assert!(f(40) == 42);
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/// ```
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#[macro_export]
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macro_rules! static_assert {
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($condition:expr) => {
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const _: () = core::assert!($condition);
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};
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}
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