maitake_sync/util/
fmt.rs

1pub use core::fmt::*;
2
3/// A wrapper type that formats the wrapped value using a provided function.
4///
5/// This is used to implement the `ptr` and `display` util functions.
6pub(crate) struct FormatWith<T, F = fn(&T, &mut Formatter<'_>) -> Result>
7where
8    F: Fn(&T, &mut Formatter<'_>) -> Result,
9{
10    value: T,
11    fmt: F,
12}
13
14#[derive(Clone)]
15pub(crate) struct FmtOption<'a, T> {
16    opt: Option<&'a T>,
17    or_else: &'a str,
18}
19
20// === impl FormatWith ===
21
22#[cfg(any(test, feature = "tracing", loom))]
23#[inline]
24#[must_use]
25pub(crate) fn ptr<T: Pointer>(value: T) -> FormatWith<T> {
26    FormatWith {
27        value,
28        fmt: Pointer::fmt,
29    }
30}
31
32#[inline]
33#[must_use]
34pub(crate) fn display<T: Display>(value: T) -> FormatWith<T> {
35    FormatWith {
36        value,
37        fmt: Display::fmt,
38    }
39}
40
41impl<T, F> Debug for FormatWith<T, F>
42where
43    F: Fn(&T, &mut Formatter<'_>) -> Result,
44{
45    #[inline]
46    fn fmt(&self, f: &mut Formatter<'_>) -> Result {
47        (self.fmt)(&self.value, f)
48    }
49}
50
51// === impl FmtOption ====
52
53#[must_use]
54#[inline]
55pub(crate) const fn opt<T>(value: &Option<T>) -> FmtOption<'_, T> {
56    FmtOption {
57        opt: value.as_ref(),
58        or_else: "",
59    }
60}
61
62impl<'a, T> FmtOption<'a, T> {
63    #[must_use]
64    #[inline]
65    pub(crate) fn or_else(self, or_else: &'a str) -> Self {
66        Self { or_else, ..self }
67    }
68}
69
70impl<T: Debug> Debug for FmtOption<'_, T> {
71    #[inline]
72    fn fmt(&self, f: &mut Formatter<'_>) -> Result {
73        match self.opt {
74            Some(val) => Debug::fmt(val, f),
75            None => f.write_str(self.or_else),
76        }
77    }
78}
79
80impl<T: Display> Display for FmtOption<'_, T> {
81    #[inline]
82    fn fmt(&self, f: &mut Formatter<'_>) -> Result {
83        match self.opt {
84            Some(val) => val.fmt(f),
85            None => f.write_str(self.or_else),
86        }
87    }
88}
maitake_sync/util/fmt.rs

maitake_sync/util/
fmt.rs
