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Add documentation on wrap_err vs wrap_err_with #93

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merged 4 commits into from
Nov 24, 2023
Merged

Add documentation on wrap_err vs wrap_err_with #93

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a36ce88
Add documentation on wrap_err vs wrap_err_with
akshayknarayan Apr 20, 2023
a8a5776
Merge branch 'master' into wrap-err-docs
yaahc Sep 20, 2023
4919e04
make the text clearer
akshayknarayan Nov 21, 2023
a699d1b
Merge remote-tracking branch 'upstream/master' into wrap-err-docs
akshayknarayan Nov 24, 2023
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7 changes: 7 additions & 0 deletions eyre/src/lib.rs
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Expand Up @@ -1084,6 +1084,13 @@ pub type Result<T, E = Report> = core::result::Result<T, E>;
/// # panic!("expected downcast to succeed");
/// }
/// ```
///
/// # `wrap_err` vs `wrap_err_with`
///
/// `wrap_err` incurs a runtime cost even in the non-error case because it requires eagerly
/// constructing the error object. `wrap_err_with` avoids this cost through lazy evaluation. This
/// cost is proportional to the cost of the currently installed [`EyreHandler`]'s creation step.
/// `wrap_err` is useful in cases where an constructed error object already exists.
pub trait WrapErr<T, E>: context::private::Sealed {
/// Wrap the error value with a new adhoc error
#[cfg_attr(track_caller, track_caller)]
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