pub struct IntermediateBox<T> where T: ?Sized { /* fields omitted */ }
IntermediateBox represents uninitialized backing storage for Box.
FIXME (pnkfelix): Ideally we would just reuse Box<T> instead of introducing a separate IntermediateBox<T>; but then you hit issues when you e.g. attempt to destructure an instance of Box, since it is a lang item and so it gets special handling by the compiler. Easier just to make this parallel type for now.
FIXME (pnkfelix): Currently the box protocol only supports creating instances of sized types. This IntermediateBox is designed to be forward-compatible with a future protocol that supports creating instances of unsized types; that is why the type parameter has the ?Sized generalization marker, and is also why this carries an explicit size. However, it probably does not need to carry the explicit alignment; that is just a work-around for the fact that the align_of intrinsic currently requires the input type to be Sized (which I do not think is strictly necessary).
impl<T> Place<T> for IntermediateBox<T>
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fn pointer(&mut self) -> *mut TReturns the address where the input value will be written. Note that the data at this address is generally uninitialized, and thus one should use ptr::write for initializing it. Read more
impl<T> InPlace<T> for IntermediateBox<T>
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type Owner = Box<T>Owner is the type of the end value of PLACE <- EXPR Read more
unsafe fn finalize(self) -> Box<T>Converts self into the final value, shifting deallocation/cleanup responsibilities (if any remain), over to the returned instance of Owner and forgetting self. Read more
impl<T> Drop for IntermediateBox<T> where T: ?Sized
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fn drop(&mut self)A method called when the value goes out of scope. Read more
impl<T> BoxPlace<T> for IntermediateBox<T>
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fn make_place() -> IntermediateBox<T>Creates a globally fresh place.
© 2010 The Rust Project Developers
Licensed under the Apache License, Version 2.0 or the MIT license, at your option.
https://doc.rust-lang.org/std/boxed/struct.IntermediateBox.html