pub struct Maybe<Inner: DependencySpec> { /* private fields */ }
Expand description
Returns None
if an optional dependency is not registered
Trait Implementations§
source§impl<Inner: DependencySpec> DependencySpec for Maybe<Inner>
impl<Inner: DependencySpec> DependencySpec for Maybe<Inner>
type ReturnType = Option<<Inner as DependencySpec>::ReturnType>
fn get(cat: &Catalog) -> Result<Self::ReturnType, InjectionError>
fn check(cat: &Catalog) -> Result<(), InjectionError>
Auto Trait Implementations§
impl<Inner> RefUnwindSafe for Maybe<Inner>where Inner: RefUnwindSafe,
impl<Inner> Send for Maybe<Inner>where Inner: Send,
impl<Inner> Sync for Maybe<Inner>where Inner: Sync,
impl<Inner> Unpin for Maybe<Inner>where Inner: Unpin,
impl<Inner> UnwindSafe for Maybe<Inner>where Inner: UnwindSafe,
Blanket Implementations§
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more