40 lines
1.1 KiB
Rust
40 lines
1.1 KiB
Rust
//! The `bitcast` and `bitflags_bits` macros.
|
|
|
|
#![allow(unused_macros)]
|
|
|
|
// Ensure that the source and destination types are both primitive integer
|
|
// types and the same size, and then bitcast.
|
|
macro_rules! bitcast {
|
|
($x:expr) => {{
|
|
if false {
|
|
// Ensure the source and destinations are primitive integer types.
|
|
let _ = !$x;
|
|
let _ = $x as u8;
|
|
0
|
|
} else if false {
|
|
// Ensure that the source and destinations are the same size.
|
|
#[allow(
|
|
unsafe_code,
|
|
unused_unsafe,
|
|
clippy::useless_transmute,
|
|
clippy::missing_transmute_annotations
|
|
)]
|
|
// SAFETY: This code is under an `if false`.
|
|
unsafe {
|
|
::core::mem::transmute($x)
|
|
}
|
|
} else {
|
|
// Do the conversion.
|
|
$x as _
|
|
}
|
|
}};
|
|
}
|
|
|
|
/// Return a [`bitcast`] of the value of `$x.bits()`, where `$x` is a
|
|
/// `bitflags` type.
|
|
macro_rules! bitflags_bits {
|
|
($x:expr) => {{
|
|
bitcast!($x.bits())
|
|
}};
|
|
}
|