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Add #[heapsize]/#[derive(HeapSizeOf)] plugin to auto-derive HeapSizeOf impls

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(fixes #5914)
This commit is contained in:
Manish Goregaokar 2015-03-31 08:32:11 +05:30
parent 05212b702d
commit f4bc92526a
3 changed files with 87 additions and 2 deletions
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28
components/util/mem.rs
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@ -158,3 +158,31 @@ impl<T> Drop for LinkedList2<T> {
fn drop(&mut self) {}
}
/// For use on types defined in external crates
/// with known heap sizes
#[macro_export]
macro_rules! known_heap_size(
($size:expr, $($ty:ident),+) => (
$(
impl $crate::mem::HeapSizeOf for $ty {
#[inline]
fn heap_size_of_children(&self) -> usize {
$size
}
}
)+
);
($size: expr, $ty:ident<$($gen:ident),+>) => (
impl<$($gen),+> $crate::mem::HeapSizeOf for $ty<$($gen),+> {
#[inline]
fn heap_size_of_children(&self) -> usize {
$size
}
}
);
);
known_heap_size!(0, u8, u16, u32, u64, usize);
known_heap_size!(0, i8, i16, i32, i64, isize);
known_heap_size!(0, bool);