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Update feature gate name in 'Allocator Designs'

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Code update in https://github.com/phil-opp/blog_os/pull/860.
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Philipp Oppermann
2020-09-24 10:56:43 +02:00
parent 3ac8291712
commit 68d59147e7
1 changed files with 2 additions and 2 deletions
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blog/content/second-edition/posts/11-allocator-designs/index.md
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@@ -513,7 +513,7 @@ impl ListNode {
} }
``` ```
The type has a simple constructor function named `new` and methods to calculate the start and end addresses of the represented region. We make the `new` function a [const function], which will be required later when constructing a static linked list allocator. Note that any use of mutable references in const functions (including setting the `next` field to `None`) is still unstable. In order to get it to compile, we need to add **`#![feature(const_fn)]`** to the beginning of our `lib.rs`. The type has a simple constructor function named `new` and methods to calculate the start and end addresses of the represented region. We make the `new` function a [const function], which will be required later when constructing a static linked list allocator. Note that any use of mutable references in const functions (including setting the `next` field to `None`) is still unstable. In order to get it to compile, we need to add **`#![feature(const_mut_refs)]`** to the beginning of our `lib.rs`.
[const function]: https://doc.rust-lang.org/reference/items/functions.html#const-functions [const function]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
@@ -969,7 +969,7 @@ The `new` function just initializes the `list_heads` array with empty nodes and
[`empty`]: https://docs.rs/linked_list_allocator/0.6.4/linked_list_allocator/struct.Heap.html#method.empty [`empty`]: https://docs.rs/linked_list_allocator/0.6.4/linked_list_allocator/struct.Heap.html#method.empty
If you haven't done so already for the `LinkedListAllocator` implementation, you also need to add **`#![feature(const_fn)]`** to the beginning of your `lib.rs`. The reason is that any use of mutable reference types in const functions is still unstable, including the `Option<&'static mut ListNode>` array element type of the `list_heads` field (even if we set it to `None`). If you haven't done so already for the `LinkedListAllocator` implementation, you also need to add **`#![feature(const_mut_refs)]`** to the beginning of your `lib.rs`. The reason is that any use of mutable reference types in const functions is still unstable, including the `Option<&'static mut ListNode>` array element type of the `list_heads` field (even if we set it to `None`).
The unsafe `init` function only calls the [`init`] function of the `fallback_allocator` without doing any additional initialization of the `list_heads` array. Instead, we will initialize the lists lazily on `alloc` and `dealloc` calls. The unsafe `init` function only calls the [`init`] function of the `fallback_allocator` without doing any additional initialization of the `list_heads` array. Instead, we will initialize the lists lazily on `alloc` and `dealloc` calls.