musli_core/alloc/
allocator.rs

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1use super::RawVec;
2
3/// An allocator that can be used in combination with a context.
4pub trait Allocator {
5    /// The type of an allocated buffer.
6    type RawVec<'this, T>: RawVec<T>
7    where
8        Self: 'this,
9        T: 'this;
10
11    /// Construct an empty uninitialized raw vector with an alignment matching
12    /// that of `T` that is associated with this allocator.
13    ///
14    /// ## Examples
15    ///
16    /// ```
17    /// use musli::alloc::{Allocator, RawVec};
18    ///
19    /// let values: [u32; 4] = [1, 2, 3, 4];
20    ///
21    /// musli::alloc::default!(|alloc| {
22    ///     let mut buf = alloc.new_raw_vec::<u32>();
23    ///     let mut len = 0;
24    ///
25    ///     for value in values {
26    ///         if !buf.resize(len, 1) {
27    ///             panic!("Allocation failed");
28    ///         }
29    ///
30    ///         // SAFETY: We've just resized the above buffer.
31    ///         unsafe {
32    ///             buf.as_mut_ptr().add(len).write(value);
33    ///         }
34    ///
35    ///         len += 1;
36    ///     }
37    ///
38    ///     // SAFETY: Slice does not outlive the buffer it references.
39    ///     let bytes = unsafe { core::slice::from_raw_parts(buf.as_ptr(), len) };
40    ///     assert_eq!(bytes, values);
41    /// });
42    /// ```
43    fn new_raw_vec<'a, T>(&'a self) -> Self::RawVec<'a, T>
44    where
45        T: 'a;
46}
47
48impl<A> Allocator for &A
49where
50    A: ?Sized + Allocator,
51{
52    type RawVec<'this, T> = A::RawVec<'this, T> where Self: 'this, T: 'this;
53
54    #[inline(always)]
55    fn new_raw_vec<'a, T>(&'a self) -> Self::RawVec<'a, T>
56    where
57        T: 'a,
58    {
59        (*self).new_raw_vec::<T>()
60    }
61}
musli_core/alloc/allocator.rs

musli_core/alloc/
allocator.rs
