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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
commit | 36d22d82aa202bb199967e9512281e9a53db42c9 (patch) | |
tree | 105e8c98ddea1c1e4784a60a5a6410fa416be2de /third_party/rust/pin-utils/src/stack_pin.rs | |
parent | Initial commit. (diff) | |
download | firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.tar.xz firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.zip |
Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'third_party/rust/pin-utils/src/stack_pin.rs')
-rw-r--r-- | third_party/rust/pin-utils/src/stack_pin.rs | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/third_party/rust/pin-utils/src/stack_pin.rs b/third_party/rust/pin-utils/src/stack_pin.rs new file mode 100644 index 0000000000..8a1ed2c5af --- /dev/null +++ b/third_party/rust/pin-utils/src/stack_pin.rs @@ -0,0 +1,25 @@ +/// Pins a value on the stack. +/// +/// # Example +/// +/// ```rust +/// # use pin_utils::pin_mut; +/// # use core::pin::Pin; +/// # struct Foo {} +/// let foo = Foo { /* ... */ }; +/// pin_mut!(foo); +/// let _: Pin<&mut Foo> = foo; +/// ``` +#[macro_export] +macro_rules! pin_mut { + ($($x:ident),* $(,)?) => { $( + // Move the value to ensure that it is owned + let mut $x = $x; + // Shadow the original binding so that it can't be directly accessed + // ever again. + #[allow(unused_mut)] + let mut $x = unsafe { + $crate::core_reexport::pin::Pin::new_unchecked(&mut $x) + }; + )* } +} |