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530 lines
21 KiB
HTML
530 lines
21 KiB
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<ol class="chapter"><li><a href="tutorial1.html"><strong aria-hidden="true">1.</strong> Chapter 1</a></li><li><a href="tutorial2.html"><strong aria-hidden="true">2.</strong> Chapter 2</a></li><li><a href="tutorial3.html"><strong aria-hidden="true">3.</strong> Chapter 3</a></li><li><a href="tutorial4.html"><strong aria-hidden="true">4.</strong> Chapter 4</a></li><li><a href="tutorial5.html"><strong aria-hidden="true">5.</strong> Chapter 5</a></li><li><a href="tutorial6.html"><strong aria-hidden="true">6.</strong> Chapter 6</a></li><li><a href="tutorial7.html"><strong aria-hidden="true">7.</strong> Chapter 7</a></li><li><a href="tutorial8.html"><strong aria-hidden="true">8.</strong> Chapter 8</a></li><li><a href="tutorial9.html" class="active"><strong aria-hidden="true">9.</strong> Chapter 9</a></li><li><a href="tutorial10.html"><strong aria-hidden="true">10.</strong> Chapter 10</a></li><li><a href="tutorial11.html"><strong aria-hidden="true">11.</strong> Chapter 11</a></li></ol>
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<main>
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<pre><pre class="playpen"><code class="language-rust">use crate::chainerror::*;
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use std::error::Error;
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use std::io;
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use std::result::Result;
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fn do_some_io() -> Result<(), Box<Error>> {
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Err(io::Error::from(io::ErrorKind::NotFound))?;
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Ok(())
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}
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derive_str_cherr!(Func2Error);
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fn func2() -> Result<(), Box<Error>> {
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let filename = "foo.txt";
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do_some_io().map_err(mstrerr!(Func2Error, "Error reading '{}'", filename))?;
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Ok(())
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}
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derive_str_cherr!(Func1ErrorFunc2);
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derive_str_cherr!(Func1ErrorIO);
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fn func1() -> Result<(), Box<Error>> {
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func2().map_err(mstrerr!(Func1ErrorFunc2, "func1 error calling func2"))?;
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let filename = "bar.txt";
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do_some_io().map_err(mstrerr!(Func1ErrorIO, "Error reading '{}'", filename))?;
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Ok(())
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}
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fn main() -> Result<(), Box<Error>> {
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if let Err(e) = func1() {
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if let Some(s) = e.downcast_ref::<ChainError<Func1ErrorIO>>() {
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eprintln!("Func1ErrorIO:\n{:?}", s);
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}
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if let Some(s) = try_cherr_ref!(e, Func1ErrorFunc2) {
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eprintln!("Func1ErrorFunc2:\n{:?}", s);
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}
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}
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Ok(())
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}
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# #[allow(dead_code)]
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# mod chainerror {
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# use std::error::Error;
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# use std::fmt::{Debug, Display, Formatter, Result};
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# use std::result::Result as StdResult;
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#
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# pub struct ChainError<T> {
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# #[cfg(not(feature = "no-fileline"))]
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# occurrence: Option<(u32, &'static str)>,
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# kind: T,
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# error_cause: Option<Box<dyn Error + 'static>>,
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# }
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#
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# pub type ChainResult<O, E> = StdResult<O, ChainError<E>>;
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#
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# impl<T: 'static + Display + Debug> ChainError<T> {
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# #[cfg(not(feature = "no-fileline"))]
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# pub fn new(
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# kind: T,
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# error_cause: Option<Box<dyn Error + 'static>>,
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# occurrence: Option<(u32, &'static str)>,
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# ) -> Self {
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# Self {
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# occurrence,
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# kind,
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# error_cause,
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# }
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# }
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#
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# #[cfg(feature = "no-fileline")]
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# pub fn new(
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# kind: T,
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# error_cause: Option<Box<dyn Error + 'static>>,
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# _occurrence: Option<(u32, &'static str)>,
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# ) -> Self {
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# Self { kind, error_cause }
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# }
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#
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# pub fn root_cause(&self) -> Option<&(dyn Error + 'static)> {
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# let mut cause = self as &(dyn Error + 'static);
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# while let Some(c) = cause.source() {
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# cause = c;
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# }
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# Some(cause)
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# }
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#
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# pub fn find_cause<U: Error + 'static>(&self) -> Option<&U> {
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# let mut cause = self as &(dyn Error + 'static);
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# loop {
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# if cause.is::<U>() {
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# return cause.downcast_ref::<U>();
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# }
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#
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# match cause.source() {
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# Some(c) => cause = c,
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# None => return None,
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# }
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# }
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# }
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#
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# pub fn find_chain_cause<U: Error + 'static>(&self) -> Option<&ChainError<U>> {
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# let mut cause = self as &(dyn Error + 'static);
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# loop {
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# if cause.is::<ChainError<U>>() {
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# return cause.downcast_ref::<ChainError<U>>();
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# }
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#
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# match cause.source() {
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# Some(c) => cause = c,
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# None => return None,
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# }
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# }
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# }
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#
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# pub fn kind<'a>(&'a self) -> &'a T {
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# &self.kind
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# }
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# }
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#
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# pub trait ChainErrorDown {
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# fn is_chain<T: 'static + Display + Debug>(&self) -> bool;
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# fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>>;
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# fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>>;
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# }
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#
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# use std::any::TypeId;
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#
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# impl<U: 'static + Display + Debug> ChainErrorDown for ChainError<U> {
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# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {
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# TypeId::of::<T>() == TypeId::of::<U>()
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# }
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#
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# fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {
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# if self.is_chain::<T>() {
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# unsafe { Some(&*(self as *const dyn Error as *const &ChainError<T>)) }
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# } else {
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# None
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# }
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# }
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#
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# fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {
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# if self.is_chain::<T>() {
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# unsafe { Some(&mut *(self as *mut dyn Error as *mut &mut ChainError<T>)) }
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# } else {
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# None
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# }
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# }
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# }
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#
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# impl ChainErrorDown for dyn Error + 'static {
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# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {
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# self.is::<ChainError<T>>()
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# }
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#
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# fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {
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# self.downcast_ref::<ChainError<T>>()
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# }
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#
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# fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {
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# self.downcast_mut::<ChainError<T>>()
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# }
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# }
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#
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# impl ChainErrorDown for dyn Error + 'static + Send {
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# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {
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# self.is::<ChainError<T>>()
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# }
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#
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# fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {
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# self.downcast_ref::<ChainError<T>>()
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# }
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#
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# fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {
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# self.downcast_mut::<ChainError<T>>()
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# }
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# }
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#
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# impl ChainErrorDown for dyn Error + 'static + Send + Sync {
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# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {
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# self.is::<ChainError<T>>()
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# }
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#
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# fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {
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# self.downcast_ref::<ChainError<T>>()
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# }
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#
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|
# fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {
|
||
|
|
# self.downcast_mut::<ChainError<T>>()
|
||
|
|
# }
|
||
|
|
# }
|
||
|
|
#
|
||
|
|
# impl<T: 'static + Display + Debug> Error for ChainError<T> {
|
||
|
|
# fn source(&self) -> Option<&(dyn Error + 'static)> {
|
||
|
|
# if let Some(ref e) = self.error_cause {
|
||
|
|
# Some(e.as_ref())
|
||
|
|
# } else {
|
||
|
|
# None
|
||
|
|
# }
|
||
|
|
# }
|
||
|
|
# }
|
||
|
|
#
|
||
|
|
# impl<T: 'static + Display + Debug> Error for &ChainError<T> {
|
||
|
|
# fn source(&self) -> Option<&(dyn Error + 'static)> {
|
||
|
|
# if let Some(ref e) = self.error_cause {
|
||
|
|
# Some(e.as_ref())
|
||
|
|
# } else {
|
||
|
|
# None
|
||
|
|
# }
|
||
|
|
# }
|
||
|
|
# }
|
||
|
|
#
|
||
|
|
# impl<T: 'static + Display + Debug> Error for &mut ChainError<T> {
|
||
|
|
# fn source(&self) -> Option<&(dyn Error + 'static)> {
|
||
|
|
# if let Some(ref e) = self.error_cause {
|
||
|
|
# Some(e.as_ref())
|
||
|
|
# } else {
|
||
|
|
# None
|
||
|
|
# }
|
||
|
|
# }
|
||
|
|
# }
|
||
|
|
#
|
||
|
|
# impl<T: 'static + Display + Debug> Display for ChainError<T> {
|
||
|
|
# fn fmt(&self, f: &mut Formatter) -> Result {
|
||
|
|
# write!(f, "{}", self.kind)?;
|
||
|
|
#
|
||
|
|
# #[cfg(feature = "display-cause")]
|
||
|
|
# {
|
||
|
|
# if let Some(e) = self.source() {
|
||
|
|
# writeln!(f, "\nCaused by:")?;
|
||
|
|
# Display::fmt(&e, f)?;
|
||
|
|
# }
|
||
|
|
# }
|
||
|
|
# Ok(())
|
||
|
|
# }
|
||
|
|
# }
|
||
|
|
#
|
||
|
|
# impl<T: 'static + Display + Debug> Debug for ChainError<T> {
|
||
|
|
# fn fmt(&self, f: &mut Formatter) -> Result {
|
||
|
|
# #[cfg(not(feature = "no-fileline"))]
|
||
|
|
# {
|
||
|
|
# if let Some(o) = self.occurrence {
|
||
|
|
# write!(f, "{}:{}: ", o.1, o.0)?;
|
||
|
|
# }
|
||
|
|
# }
|
||
|
|
#
|
||
|
|
# Debug::fmt(&self.kind, f)?;
|
||
|
|
#
|
||
|
|
# #[cfg(not(feature = "no-debug-cause"))]
|
||
|
|
# {
|
||
|
|
# if let Some(e) = self.source() {
|
||
|
|
# writeln!(f, "\nCaused by:")?;
|
||
|
|
# Debug::fmt(&e, f)?;
|
||
|
|
# }
|
||
|
|
# }
|
||
|
|
# Ok(())
|
||
|
|
# }
|
||
|
|
# }
|
||
|
|
#
|
||
|
|
# #[macro_export]
|
||
|
|
# macro_rules! cherr {
|
||
|
|
# ( $k:expr ) => {
|
||
|
|
# ChainError::<_>::new($k, None, Some((line!(), file!())))
|
||
|
|
# };
|
||
|
|
# ( $e:expr, $k:expr ) => {
|
||
|
|
# ChainError::<_>::new($k, Some(Box::from($e)), Some((line!(), file!())))
|
||
|
|
# };
|
||
|
|
# }
|
||
|
|
#
|
||
|
|
# #[macro_export]
|
||
|
|
# macro_rules! mstrerr {
|
||
|
|
# ( $t:ident, $v:expr $(, $more:expr)* ) => {
|
||
|
|
# |e| cherr!(e, $t (format!($v, $( $more , )* )))
|
||
|
|
# };
|
||
|
|
# ( $t:path, $v:expr $(, $more:expr)* ) => {
|
||
|
|
# |e| cherr!(e, $t (format!($v, $( $more , )* )))
|
||
|
|
# };
|
||
|
|
# ( $v:expr $(, $more:expr)* ) => {
|
||
|
|
# |e| cherr!(e, format!($v, $( $more , )* ))
|
||
|
|
# };
|
||
|
|
# }
|
||
|
|
#
|
||
|
|
# #[macro_export]
|
||
|
|
# macro_rules! derive_str_cherr {
|
||
|
|
# ($e:ident) => {
|
||
|
|
# struct $e(String);
|
||
|
|
# impl ::std::fmt::Display for $e {
|
||
|
|
# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
|
||
|
|
# write!(f, "{}", self.0)
|
||
|
|
# }
|
||
|
|
# }
|
||
|
|
# impl ::std::fmt::Debug for $e {
|
||
|
|
# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
|
||
|
|
# write!(f, "{}({})", stringify!($e), self.0)
|
||
|
|
# }
|
||
|
|
# }
|
||
|
|
# impl ::std::error::Error for $e {}
|
||
|
|
# };
|
||
|
|
# }
|
||
|
|
#
|
||
|
|
# #[macro_export]
|
||
|
|
# macro_rules! try_cherr_ref {
|
||
|
|
# ( $e:expr, $t:ident ) => {
|
||
|
|
# $e.downcast_ref::<ChainError<$t>>()
|
||
|
|
# };
|
||
|
|
# ( $e:expr, $t:path ) => {
|
||
|
|
# $e.downcast_ref::<ChainError<$t>>()
|
||
|
|
# };
|
||
|
|
# }
|
||
|
|
#
|
||
|
|
# #[macro_export]
|
||
|
|
# macro_rules! try_cherr_mut {
|
||
|
|
# ( $e:expr, $t:ident ) => {
|
||
|
|
# $e.downcast_mut::<ChainError<$t>>()
|
||
|
|
# };
|
||
|
|
# ( $e:expr, $t:path ) => {
|
||
|
|
# $e.downcast_mut::<ChainError<$t>>()
|
||
|
|
# };
|
||
|
|
# }
|
||
|
|
# }
|
||
|
|
</code></pre></pre>
|
||
|
|
|
||
|
|
</main>
|
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<nav class="nav-wrapper" aria-label="Page navigation">
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</div>
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<nav class="nav-wide-wrapper" aria-label="Page navigation">
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