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Knowledge

fdu_core

Enum Knowledge 

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pub enum Knowledge<T> {
    Present(T),
    Absent,
    Unknown {
        reason: CoverageReason,
    },
}
Expand description

Three-valued knowledge for a path lookup.

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Present(T)

The requested value is retained.

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Absent

Complete relevant coverage proves the path is absent.

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Unknown

Current coverage cannot prove presence or absence.

Fields

§reason: CoverageReason

Why the relevant scope is incomplete.

Trait Implementations§

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impl<T: Clone> Clone for Knowledge<T>

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fn clone(&self) -> Self

Returns a duplicate of the value. Read more
1.0.0 (const: unstable) · Source§

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl<T: Debug> Debug for Knowledge<T>

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl<T: Eq> Eq for Knowledge<T>

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impl<T: PartialEq> PartialEq for Knowledge<T>

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fn eq(&self, other: &Self) -> bool

Equality operator ==. Read more
1.0.0 (const: unstable) · Source§

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=. Read more
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impl<T: PartialEq> StructuralPartialEq for Knowledge<T>

Auto Trait Implementations§

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impl<T> Freeze for Knowledge<T>
where T: Freeze,

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impl<T> RefUnwindSafe for Knowledge<T>
where T: RefUnwindSafe,

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impl<T> Send for Knowledge<T>
where T: Send,

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impl<T> Sync for Knowledge<T>
where T: Sync,

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impl<T> Unpin for Knowledge<T>
where T: Unpin,

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impl<T> UnsafeUnpin for Knowledge<T>
where T: UnsafeUnpin,

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impl<T> UnwindSafe for Knowledge<T>
where T: UnwindSafe,

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dest. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = !

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, !>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.