| 1 | #[cfg(feature = "std")] |
|---|---|
| 2 | use std::{error::Error, fmt}; |
| 3 | |
| 4 | #[cfg(not(feature = "std"))] |
| 5 | use core::fmt; |
| 6 | |
| 7 | /// Runtime error when a `build()` method is called and one or more required fields |
| 8 | /// do not have a value. |
| 9 | #[derive(Debug, Clone)] |
| 10 | pub struct UninitializedFieldError(&'static str); |
| 11 | |
| 12 | impl UninitializedFieldError { |
| 13 | /// Create a new `UnitializedFieldError` for the specified field name. |
| 14 | pub fn new(field_name: &'static str) -> Self { |
| 15 | UninitializedFieldError(field_name) |
| 16 | } |
| 17 | |
| 18 | /// Get the name of the first-declared field that wasn't initialized |
| 19 | pub fn field_name(&self) -> &'static str { |
| 20 | self.0 |
| 21 | } |
| 22 | } |
| 23 | |
| 24 | impl fmt::Display for UninitializedFieldError { |
| 25 | fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { |
| 26 | write!(f, "Field not initialized:{} ", self.0) |
| 27 | } |
| 28 | } |
| 29 | |
| 30 | #[cfg(feature = "std")] |
| 31 | impl Error for UninitializedFieldError {} |
| 32 | |
| 33 | impl From<&'static str> for UninitializedFieldError { |
| 34 | fn from(field_name: &'static str) -> Self { |
| 35 | Self::new(field_name) |
| 36 | } |
| 37 | } |
| 38 |