musli_allocator/
disabled.rs

1use core::fmt::Arguments;
2
3use musli::buf::Error;
4use musli::{Allocator, Buf};
5
6/// An empty buffer.
7pub struct EmptyBuf;
8
9impl Buf for EmptyBuf {
10    #[inline(always)]
11    fn write(&mut self, _: &[u8]) -> bool {
12        false
13    }
14
15    #[inline(always)]
16    fn len(&self) -> usize {
17        0
18    }
19
20    #[inline(always)]
21    fn as_slice(&self) -> &[u8] {
22        &[]
23    }
24
25    #[inline(always)]
26    fn write_fmt(&mut self, _: Arguments<'_>) -> Result<(), Error> {
27        Err(Error)
28    }
29}
30
31/// An allocator which cannot allocate anything.
32///
33/// If any operation requires allocations this will error.
34#[non_exhaustive]
35pub struct Disabled;
36
37impl Disabled {
38    /// Construct a new disabled allocator.
39    #[inline]
40    pub const fn new() -> Self {
41        Self
42    }
43}
44
45impl Default for Disabled {
46    #[inline]
47    fn default() -> Self {
48        Self::new()
49    }
50}
51
52impl Allocator for Disabled {
53    type Buf<'this> = EmptyBuf;
54
55    #[inline(always)]
56    fn alloc(&self) -> Option<Self::Buf<'_>> {
57        Some(EmptyBuf)
58    }
59}
musli_allocator/disabled.rs

musli_allocator/
disabled.rs
