const_panic/fmt_impls/
option_fmt_impls.rs

1use crate::{FmtArg, PanicFmt, PanicVal};
2
3/// Note: there is only `to_panicvals` methods for `Option`s of standard library types
4/// for now.
5///
6impl<T> PanicFmt for Option<T>
7where
8    T: PanicFmt,
9{
10    type This = Self;
11    type Kind = crate::fmt::IsStdType;
12    const PV_COUNT: usize = 4 + T::PV_COUNT;
13}
14
15macro_rules! impl_for_option {
16    (
17        $((for[$($generics:tt)*],$lt:lifetime, $ty:ty, $unref:ty))*
18    ) => (
19        $(
20            impl<'s, $($generics)*> crate::StdWrapper<&'s Option<$ty>> {
21                #[doc = concat!(
22                    "Converts this `Option<",
23                    stringify!($ty),
24                    ">` to a `PanicVal` array."
25                )]
26                pub const fn to_panicvals(
27                    self: Self,
28                    mut fmtarg: FmtArg,
29                ) -> [PanicVal<$lt>; 5] {
30                    use crate::{PanicVal, StdWrapper, __::EPV, fmt};
31
32                    match self.0 {
33                        Some(x) => [
34                            PanicVal::write_str("Some"),
35                            {fmtarg = fmtarg.indent(); fmt::OpenParen.to_panicval(fmtarg)},
36                            StdWrapper::<&$unref>(x).to_panicval(fmtarg),
37                            fmt::COMMA_TERM.to_panicval(fmtarg),
38                            {fmtarg = fmtarg.unindent(); fmt::CloseParen.to_panicval(fmtarg)},
39                        ],
40                        None => [PanicVal::write_str("None"), EPV, EPV, EPV, EPV],
41                    }
42                }
43            }
44        )*
45    )
46}
47
48macro_rules! impl_for_option_outer {
49    (
50        $(($lt:lifetime, $ty:ty, $unref:ty))*
51    ) => (
52        impl_for_option!{
53            $(
54                (for[], $lt, $ty, $unref)
55                (for[const N: usize], 's, [$ty; N], [$ty; N])
56                (for[const N: usize], 's, &'s [$ty; N], [$ty; N])
57                (for[], 's, &'s [$ty], [$ty])
58            )*
59        }
60    )
61}
62
63impl_for_option_outer! {
64    ('static, bool, bool)
65    ('static, u8, u8)
66    ('static, u16, u16)
67    ('static, u32, u32)
68    ('static, u64, u64)
69    ('static, u128, u128)
70    ('static, i8, i8)
71    ('static, i16, i16)
72    ('static, i32, i32)
73    ('static, i64, i64)
74    ('static, i128, i128)
75    ('static, isize, isize)
76    ('static, usize, usize)
77    ('s, &'s str, str)
78}
const_panic/fmt_impls/option_fmt_impls.rs

const_panic/fmt_impls/
option_fmt_impls.rs
