83 lines
1.5 KiB
Rust
83 lines
1.5 KiB
Rust
#[allow(unused_imports)]
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use crate as defmt;
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use crate::{Format, Formatter, Str};
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pub trait Truncate<U> {
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fn truncate(self) -> U;
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}
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macro_rules! impl_truncate {
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($($from:ty => $into:ty),*) => {
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$(impl Truncate<$into> for $from {
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fn truncate(self) -> $into {
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self as $into
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}
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})*
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};
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}
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// We implement `Truncate<X> for X` so that the macro can unconditionally use it,
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// even if no truncation is performed.
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impl_truncate!(
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u8 => u8,
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u16 => u8,
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u32 => u8,
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u64 => u8,
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u128 => u8,
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u16 => u16,
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u32 => u16,
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u64 => u16,
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u128 => u16,
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u32 => u32,
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u64 => u32,
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u128 => u32,
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u64 => u64,
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u128 => u64,
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u128 => u128
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);
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#[derive(Debug, Copy, Clone, Eq, PartialEq)]
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pub struct NoneError;
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impl Format for NoneError {
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fn format(&self, _fmt: Formatter) {
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unreachable!();
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}
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fn _format_tag() -> Str {
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defmt_macros::internp!("Unwrap of a None option value")
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}
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fn _format_data(&self) {}
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}
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/// Transform `self` into a `Result`
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///
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/// # Call sites
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/// * [`defmt::unwrap!`]
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pub trait IntoResult {
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type Ok;
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type Error;
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fn into_result(self) -> Result<Self::Ok, Self::Error>;
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}
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impl<T> IntoResult for Option<T> {
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type Ok = T;
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type Error = NoneError;
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#[inline]
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fn into_result(self) -> Result<T, NoneError> {
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self.ok_or(NoneError)
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}
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}
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impl<T, E> IntoResult for Result<T, E> {
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type Ok = T;
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type Error = E;
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#[inline]
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fn into_result(self) -> Self {
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self
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}
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}
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