Trait guard_trait::GuardedExt

pub trait GuardedExt: Sealed + Guarded + Sized {
    fn map<F, T>(this: Self, f: F) -> Mapped<Self, T>
    where
        F: FnOnce(&Self::Target) -> &T,
        T: ?Sized,
    { ... }
    fn try_map<F, T, E>(this: Self, f: F) -> Result<Mapped<Self, T>, E>
    where
        F: FnOnce(&Self::Target) -> Result<&T, E>,
        T: ?Sized,
    { ... }
}

An extension trait for convenience methods, that is automatically implemented for all Guarded types.

Provided methods

fn map<F, T>(this: Self, f: F) -> Mapped<Self, T> where
    F: FnOnce(&Self::Target) -> &T,
    T: ?Sized, 

Apply a function to the pointee, creating a new guarded type that dereferences into the result of that function.

The closure is only evaluated once, and the resulting wrapper will only store one null-optimizable additional word, for the reference.

fn try_map<F, T, E>(this: Self, f: F) -> Result<Mapped<Self, T>, E> where
    F: FnOnce(&Self::Target) -> Result<&T, E>,
    T: ?Sized, 

Apply a fallible function to the pointee, creating a new guarded type that dereferences into the result of that function.

If the function fails, the error is returned directly, and no further mapping is made.

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Implementors

impl<T> GuardedExt for T where
    T: Guarded + Sized, 

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