Struct ensure::Absent

pub struct Absent<T>(pub T)
 where
    T: External;

Marks External object as something that does not exist.

Trait Implementations

impl<T> ExternalState<T> for Absent<T> where
    T: External, 

fn invalidate_state(self) -> T

Gets base undefined state representation from concrete state.

impl<T> Ord for Absent<T> where
    T: External + Ord, 

fn cmp(&self, other: &Self) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

🔬 This is a nightly-only experimental API. (clamp)

Restrict a value to a certain interval.

impl<T> PartialOrd<Absent<T>> for Absent<T> where
    T: External + PartialOrd, 

fn partial_cmp(&self, other: &Self) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

#[must_use] fn lt(&self, other: &Rhs) -> bool

This method tests less than (for self and other) and is used by the < operator.

#[must_use] fn le(&self, other: &Rhs) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator.

#[must_use] fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for self and other) and is used by the > operator.

#[must_use] fn ge(&self, other: &Rhs) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator.

impl<T> Eq for Absent<T> where
    T: External + Eq, 

impl<T> PartialEq<Absent<T>> for Absent<T> where
    T: External + PartialEq, 

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

This method tests for self and other values to be equal, and is used by ==.

#[must_use] fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl<T> Deref for Absent<T> where
    T: External, 

type Target = T

The resulting type after dereferencing.

fn deref(&self) -> &Self::Target

Dereferences the value.

impl<T> Debug for Absent<T> where
    T: External + Debug, 

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

Formats the value using the given formatter.