use core::fmt::{self, Debug, Display};
#[cfg(feature = "std")]
use std::boxed::Box;
pub type Result<T> = core::result::Result<T, Error>;
#[derive(Default)]
pub struct Error {
_private: (),
#[cfg(feature = "std")]
source: Option<Box<dyn std::error::Error + Send + Sync + 'static>>,
}
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<Box<dyn std::error::Error + Send + Sync + 'static>>,
) -> Self {
Self {
_private: (),
source: Some(source.into()),
}
}
}
impl Debug for Error {
#[cfg(not(feature = "std"))]
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.write_str("signature::Error {}")
}
#[cfg(feature = "std")]
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.write_str("signature::Error { source: ")?;
if let Some(source) = &self.source {
write!(f, "Some({})", source)?;
} else {
f.write_str("None")?;
}
f.write_str(" }")
}
}
impl Display for Error {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.write_str("signature error")
}
}
#[cfg(feature = "std")]
impl From<Box<dyn std::error::Error + Send + Sync + 'static>> for Error {
fn from(source: Box<dyn std::error::Error + Send + Sync + 'static>) -> 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))
}
}