Description
API
impl<T, E> Result<T, E> {
fn as_deref(&self) -> Result<&T::Target, &E> where T: Deref;
fn as_deref_err(&self) -> Result<&T, &E::Target> where E: Deref;
fn as_deref_mut(&mut self) -> Result<&mut T::Target, &mut E> where T: DerefMut;
fn as_deref_mut_err(&mut self) -> Result<&mut T, &mut E::Target> where E: DerefMut;
}Implementation history
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Implemented in Implement inner deref for Option and Result #50267 as:
impl<T> Option<T> { fn deref(&self) -> Option<&T::Target> where T: Deref; } impl<T, E> Result<T, E> { fn deref(&self) -> Result<&T::Target, &E::Target> where T: Deref, E: Deref; fn deref_ok(&self) -> Result<&T::Target, &E> where T: Deref; fn deref_err(&self) -> Result<&T, &E::Target> where E: Deref; }
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Renamed and extended in
as_deref()andas_deref_mut()impls #59628 / Introduceas_derefto Option #62421:impl<T> Option<T> { fn as_deref(&self) -> Option<&T::Target> where T: Deref; fn as_deref_mut(&mut self) -> Option<&mut T::Target> where T: DerefMut; } impl<T, E> Result<T, E> { fn as_deref(&self) -> Result<&T::Target, &E::Target> where T: Deref, E: Deref; fn as_deref_ok(&self) -> Result<&T::Target, &E> where T: Deref; fn as_deref_err(&self) -> Result<&T, &E::Target> where E: Deref; fn as_deref_mut(&mut self) -> Result<&mut T::Target, &mut E::Target> where T: DerefMut, E: DerefMut; fn as_deref_mut_ok(&mut self) -> Result<&mut T::Target, &mut E> where T: DerefMut; fn as_deref_mut_err(&mut self) -> Result<&mut T, &mut E::Target> where E: DerefMut; }
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Optionmethods stabilized in StabilizeOption::as_derefandOption::as_deref_mut#64708:impl<T> Option<T> { fn as_deref(&self) -> Option<&T::Target> where T: Deref; fn as_deref_mut(&mut self) -> Option<&mut T::Target> where T: DerefMut; }
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Resultmethods pared down and renamed in Rename Result::as_deref_ok to as_deref #67930:impl<T, E> Result<T, E> { fn as_deref(&self) -> Result<&T::Target, &E> where T: Deref; fn as_deref_err(&self) -> Result<&T, &E::Target> where E: Deref; fn as_deref_mut(&mut self) -> Result<&mut T::Target, &mut E> where T: DerefMut; fn as_deref_mut_err(&mut self) -> Result<&mut T, &mut E::Target> where E: DerefMut; }