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use core::fmt::{self, Display};
#[cfg(feature = "std")]
use std::boxed::Box;
#[cfg(feature = "std")]
#[cfg_attr(docsrs, doc(cfg(feature = "std")))]
pub type BoxError = Box<dyn std::error::Error + Send + Sync + 'static>;
#[derive(Debug, Default)]
pub struct Error {
#[cfg(feature = "std")]
source: Option<BoxError>,
}
impl Error {
pub fn new() -> Self {
Self::default()
}
#[cfg(feature = "std")]
#[cfg_attr(docsrs, doc(cfg(feature = "std")))]
pub fn from_source(source: impl Into<BoxError>) -> Self {
Self {
source: Some(source.into()),
}
}
}
impl Display for Error {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.write_str("signature error")
}
}
#[cfg(feature = "std")]
impl From<BoxError> for Error {
fn from(source: BoxError) -> Error {
Self::from_source(source)
}
}
#[cfg(feature = "std")]
impl std::error::Error for Error {
fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
self.source
.as_ref()
.map(|source| source.as_ref() as &(dyn std::error::Error + 'static))
}
}