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style: Introduce ArcSlice, a small wrapper over ThinArc but without an explicit header.

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We could make the header PhantomData or something, but then we wouldn't be able
to bind to C++, since C++ doesn't have ZSTs. So add a canary instead to add a
runtime check of stuff being sane.

Differential Revision: https://phabricator.services.mozilla.com/D30133
This commit is contained in:
Emilio Cobos Álvarez 2019-05-09 10:53:50 +00:00
parent 2ed2151b3d
commit 0d5c4481b8
6 changed files with 98 additions and 3 deletions
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2
components/style_traits/specified_value_info.rs
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@ -4,6 +4,7 @@
//! Value information for devtools.
use crate::arc_slice::ArcSlice;
use servo_arc::Arc;
use std::ops::Range;
use std::sync::Arc as StdArc;
@ -116,6 +117,7 @@ impl_generic_specified_value_info!(Option<T>);
impl_generic_specified_value_info!(Vec<T>);
impl_generic_specified_value_info!(Arc<T>);
impl_generic_specified_value_info!(StdArc<T>);
impl_generic_specified_value_info!(ArcSlice<T>);
impl_generic_specified_value_info!(Range<Idx>);
impl<T1, T2> SpecifiedValueInfo for (T1, T2)