| 1 | use std::fmt; |
|---|---|
| 2 | #[cfg(feature= "std")] |
| 3 | use std::any::Any; |
| 4 | #[cfg(feature= "std")] |
| 5 | use std::error::Error; |
| 6 | |
| 7 | /// Error value indicating insufficient capacity |
| 8 | #[derive(Clone, Copy, Eq, Ord, PartialEq, PartialOrd)] |
| 9 | pub struct CapacityError<T = ()> { |
| 10 | element: T, |
| 11 | } |
| 12 | |
| 13 | impl<T> CapacityError<T> { |
| 14 | /// Create a new `CapacityError` from `element`. |
| 15 | pub const fn new(element: T) -> CapacityError<T> { |
| 16 | CapacityError { |
| 17 | element: element, |
| 18 | } |
| 19 | } |
| 20 | |
| 21 | /// Extract the overflowing element |
| 22 | pub fn element(self) -> T { |
| 23 | self.element |
| 24 | } |
| 25 | |
| 26 | /// Convert into a `CapacityError` that does not carry an element. |
| 27 | pub fn simplify(self) -> CapacityError { |
| 28 | CapacityError { element: () } |
| 29 | } |
| 30 | } |
| 31 | |
| 32 | const CAPERROR: &'static str = "insufficient capacity"; |
| 33 | |
| 34 | #[cfg(feature= "std")] |
| 35 | /// Requires `features="std"`. |
| 36 | impl<T: Any> Error for CapacityError<T> {} |
| 37 | |
| 38 | impl<T> fmt::Display for CapacityError<T> { |
| 39 | fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { |
| 40 | write!(f, "{} ", CAPERROR) |
| 41 | } |
| 42 | } |
| 43 | |
| 44 | impl<T> fmt::Debug for CapacityError<T> { |
| 45 | fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { |
| 46 | write!(f, "{} :{} ", "CapacityError", CAPERROR) |
| 47 | } |
| 48 | } |
| 49 | |
| 50 |