65 lines
1.6 KiB
Rust
65 lines
1.6 KiB
Rust
//! Definitions used in derived implementations of [`core::ops::Add`]-like traits.
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use core::fmt;
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use crate::UnitError;
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/// Error returned by the derived implementations when an arithmetic or logic
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/// operation is invoked on mismatched enum variants.
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#[derive(Clone, Copy, Debug)]
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pub struct WrongVariantError {
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operation_name: &'static str,
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}
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impl WrongVariantError {
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#[doc(hidden)]
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#[must_use]
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#[inline]
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pub const fn new(operation_name: &'static str) -> Self {
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Self { operation_name }
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}
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}
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impl fmt::Display for WrongVariantError {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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write!(
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f,
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"Trying to {}() mismatched enum variants",
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self.operation_name,
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)
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}
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}
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#[cfg(feature = "std")]
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impl std::error::Error for WrongVariantError {}
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/// Possible errors returned by the derived implementations of binary
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/// arithmetic or logic operations.
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#[derive(Clone, Copy, Debug)]
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pub enum BinaryError {
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/// Operation is attempted between mismatched enum variants.
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Mismatch(WrongVariantError),
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/// Operation is attempted on unit-like enum variants.
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Unit(UnitError),
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}
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impl fmt::Display for BinaryError {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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match self {
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Self::Mismatch(e) => write!(f, "{e}"),
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Self::Unit(e) => write!(f, "{e}"),
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}
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}
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}
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#[cfg(feature = "std")]
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impl std::error::Error for BinaryError {
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fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
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match self {
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Self::Mismatch(e) => e.source(),
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Self::Unit(e) => e.source(),
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}
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}
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}
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