1//! The `bitcast` and `bitflags_bits` macros.
2
3#![allow(unused_macros)]
4
5// Ensure that the source and destination types are both primitive integer
6// types and the same size, and then bitcast.
7macro_rules! bitcast {
8 ($x:expr) => {{
9 if false {
10 // Ensure the source and destinations are primitive integer types.
11 let _ = !$x;
12 let _ = $x as u8;
13 0
14 } else if false {
15 // Ensure that the source and destinations are the same size.
16 // SAFETY: This code is under an `if false`.
17 #[allow(unsafe_code, unused_unsafe, clippy::useless_transmute)]
18 unsafe {
19 ::core::mem::transmute($x)
20 }
21 } else {
22 // Do the conversion.
23 $x as _
24 }
25 }};
26}
27
28/// Return a [`bitcast`] of the value of `$x.bits()`, where `$x` is a
29/// `bitflags` type.
30macro_rules! bitflags_bits {
31 ($x:expr) => {{
32 bitcast!($x.bits())
33 }};
34}
35