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24 lines
901 B
Rust
24 lines
901 B
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 http://mozilla.org/MPL/2.0/. */
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//! Reference-counted pointers to flows.
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//!
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//! Eventually, with dynamically sized types in Rust, much of this code will
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//! be superfluous. This design is largely duplicating logic of Arc<T> and
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//! Weak<T>; please see comments there for details.
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#![allow(unsafe_code)]
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use flow::Flow;
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use std::sync::{Arc, Weak};
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pub type FlowRef = Arc<Flow>;
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pub type WeakFlowRef = Weak<Flow>;
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// FIXME(https://github.com/servo/servo/issues/6503) This introduces unsound mutable aliasing.
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// Try to replace it with Arc::get_mut (which checks that the reference count is 1).
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pub unsafe fn deref_mut<'a>(r: &'a mut FlowRef) -> &'a mut Flow {
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let ptr: *const Flow = &**r;
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&mut *(ptr as *mut Flow)
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}
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