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26 lines
1.2 KiB
Rust
26 lines
1.2 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
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//! Types used to access the DOM from style calculation.
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/// An opaque handle to a node, which, unlike UnsafeNode, cannot be transformed
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/// back into a non-opaque representation. The only safe operation that can be
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/// performed on this node is to compare it to another opaque handle or to another
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/// OpaqueNode.
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///
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/// Layout and Graphics use this to safely represent nodes for comparison purposes.
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/// Because the script task's GC does not trace layout, node data cannot be safely stored in layout
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/// data structures. Also, layout code tends to be faster when the DOM is not being accessed, for
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/// locality reasons. Using `OpaqueNode` enforces this invariant.
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#[derive(Clone, Copy, Debug, Eq, Hash, MallocSizeOf, PartialEq)]
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#[cfg_attr(feature = "servo", derive(Deserialize, Serialize))]
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pub struct OpaqueNode(pub usize);
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impl OpaqueNode {
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/// Returns the address of this node, for debugging purposes.
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#[inline]
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pub fn id(&self) -> usize {
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self.0
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}
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}
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