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add util to restore state on scope exit

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Signed-off-by: Jason Volk <jason@zemos.net>
This commit is contained in:
Jason Volk 2024-09-29 04:18:47 +00:00 • committed by strawberry
parent c9c405facf
commit 16f82b02a0
1 changed files with 9 additions and 3 deletions
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12
src/core/utils/defer.rs
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@ -15,8 +15,14 @@ macro_rules! defer {
}; };
($body:expr) => { ($body:expr) => {
$crate::defer! {{ $crate::defer! {{ $body }}
$body };
}} }
#[macro_export]
macro_rules! scope_restore {
($val:ident, $ours:expr) => {
let theirs = $crate::utils::exchange($val, $ours);
$crate::defer! {{ *$val = theirs; }};
}; };
} }