alloc_madvise/
alloc_result.rs

1//! Provides the [`AllocationError`] struct.
2
3use std::alloc::LayoutError;
4use std::error::Error;
5use std::fmt::{Display, Formatter};
6
7#[derive(Debug, PartialEq)]
8pub enum AllocationError {
9    /// An allocation of zero bytes was attempted.
10    EmptyAllocation,
11    /// The generated memory layout was invalid.
12    InvalidAlignment(LayoutError),
13}
14
15impl Error for AllocationError {}
16
17impl From<LayoutError> for AllocationError {
18    fn from(value: LayoutError) -> Self {
19        Self::InvalidAlignment(value)
20    }
21}
22
23impl Display for AllocationError {
24    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
25        match self {
26            AllocationError::EmptyAllocation => f.write_str("zero-byte allocation"),
27            AllocationError::InvalidAlignment(e) => write!(f, "invalid memory layout: {e}"),
28        }
29    }
30}
31
32impl From<AllocationError> for AllocResult {
33    fn from(val: AllocationError) -> Self {
34        match val {
35            AllocationError::EmptyAllocation => AllocResult::Empty,
36            AllocationError::InvalidAlignment(_) => AllocResult::InvalidAlignment,
37        }
38    }
39}
40
41#[repr(u32)]
42#[derive(PartialEq, Eq, Copy, Clone, Debug)]
43pub enum AllocResult {
44    Ok = 0,
45    Empty = 1 << 0,
46    InvalidAlignment = 1 << 1,
47}
48
49impl From<u32> for AllocResult {
50    fn from(value: u32) -> Self {
51        match value {
52            0 => AllocResult::Ok,
53            1 => AllocResult::Empty,
54            2 => AllocResult::InvalidAlignment,
55            _ => panic!(),
56        }
57    }
58}
alloc_madvise/alloc_result.rs

alloc_madvise/
alloc_result.rs
