105 lines
3.6 KiB
Rust
105 lines
3.6 KiB
Rust
use std::error::Error;
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use std::fmt::Debug;
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use std::fmt::Display;
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#[derive(Debug, Clone)]
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/// An error that can occur when trying to borrow a value.
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pub enum BorrowError {
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/// The value was dropped.
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Dropped(ValueDroppedError),
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/// The value was already borrowed mutably.
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AlreadyBorrowedMut(AlreadyBorrowedMutError),
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}
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impl Display for BorrowError {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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match self {
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BorrowError::Dropped(error) => Display::fmt(error, f),
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BorrowError::AlreadyBorrowedMut(error) => Display::fmt(error, f),
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}
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}
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}
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impl Error for BorrowError {}
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#[derive(Debug, Clone)]
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/// An error that can occur when trying to borrow a value mutably.
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pub enum BorrowMutError {
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/// The value was dropped.
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Dropped(ValueDroppedError),
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/// The value was already borrowed.
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AlreadyBorrowed(AlreadyBorrowedError),
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/// The value was already borrowed mutably.
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AlreadyBorrowedMut(AlreadyBorrowedMutError),
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}
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impl Display for BorrowMutError {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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match self {
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BorrowMutError::Dropped(error) => Display::fmt(error, f),
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BorrowMutError::AlreadyBorrowedMut(error) => Display::fmt(error, f),
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BorrowMutError::AlreadyBorrowed(error) => Display::fmt(error, f),
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}
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}
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}
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impl Error for BorrowMutError {}
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/// An error that can occur when trying to use a value that has been dropped.
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#[derive(Debug, Copy, Clone)]
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pub struct ValueDroppedError {
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#[cfg(any(debug_assertions, feature = "debug_ownership"))]
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pub(crate) created_at: &'static std::panic::Location<'static>,
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}
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impl Display for ValueDroppedError {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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f.write_str("Failed to borrow because the value was dropped.")?;
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#[cfg(any(debug_assertions, feature = "debug_ownership"))]
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f.write_fmt(format_args!("created_at: {}", self.created_at))?;
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Ok(())
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}
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}
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impl std::error::Error for ValueDroppedError {}
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/// An error that can occur when trying to borrow a value that has already been borrowed mutably.
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#[derive(Debug, Copy, Clone)]
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pub struct AlreadyBorrowedMutError {
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#[cfg(any(debug_assertions, feature = "debug_borrows"))]
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pub(crate) borrowed_mut_at: &'static std::panic::Location<'static>,
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}
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impl Display for AlreadyBorrowedMutError {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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f.write_str("Failed to borrow because the value was already borrowed mutably.")?;
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#[cfg(any(debug_assertions, feature = "debug_borrows"))]
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f.write_fmt(format_args!("borrowed_mut_at: {}", self.borrowed_mut_at))?;
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Ok(())
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}
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}
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impl std::error::Error for AlreadyBorrowedMutError {}
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/// An error that can occur when trying to borrow a value mutably that has already been borrowed immutably.
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#[derive(Debug, Clone)]
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pub struct AlreadyBorrowedError {
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#[cfg(any(debug_assertions, feature = "debug_borrows"))]
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pub(crate) borrowed_at: Vec<&'static std::panic::Location<'static>>,
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}
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impl Display for AlreadyBorrowedError {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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f.write_str("Failed to borrow mutably because the value was already borrowed immutably.")?;
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#[cfg(any(debug_assertions, feature = "debug_borrows"))]
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f.write_str("borrowed_at:")?;
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#[cfg(any(debug_assertions, feature = "debug_borrows"))]
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for location in self.borrowed_at.iter() {
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f.write_fmt(format_args!("\t{}", location))?;
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}
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Ok(())
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}
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}
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impl std::error::Error for AlreadyBorrowedError {}
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