Struct protobuf::SingularField

pub struct SingularField<T> { /* fields omitted */ }

Like Option<T>, but keeps the actual element on clear.

Methods

impl<T> SingularField<T>

pub fn some(value: T) -> SingularField<T>

Construct this object from given value.

pub fn is_some(&self) -> bool

True iff this object contains data.

pub fn is_none(&self) -> bool

True iff this object contains no data.

pub fn into_option(self) -> Option<T>

Convert this object into Option.

pub fn as_ref<'a>(&'a self) -> Option<&'a T>

View data as Option.

pub fn as_mut<'a>(&'a mut self) -> Option<&'a mut T>

View data as mutable Option.

pub fn unwrap_ref<'a>(&'a self) -> &'a T

Unwrap data as reference.

pub fn unwrap_mut_ref<'a>(&'a mut self) -> &'a mut T

Unwrap data as mutable reference.

pub fn unwrap(self) -> T

Unwrap data, panic if not set.

pub fn unwrap_or(self, def: T) -> T

Unwrap data or return given default value.

pub fn unwrap_or_else<F>(self, f: F) -> T where     F: FnOnce() -> T,

Unwrap data or return given default value.

pub fn map<U, F>(self, f: F) -> SingularPtrField<U> where     F: FnOnce(T) -> U,

Apply a function to contained element and store result in new SingularPtrField.

pub fn iter<'a>(&'a self) -> IntoIter<&'a T>

View as iterator over references.

pub fn mut_iter<'a>(&'a mut self) -> IntoIter<&'a mut T>

View as iterator over mutable references.

pub fn clear(&mut self)

Clear this object. Note, contained object destructor is not called, so allocated memory could be reused.

impl<T: Default> SingularField<T>

pub fn none() -> SingularField<T>

Construct a SingularField with no data.

pub fn from_option(option: Option<T>) -> SingularField<T>

Construct SingularField from Option.

pub fn take(&mut self) -> Option<T>

Return data as option, clear this object.

impl<T: Default + Clear> SingularField<T>

pub fn unwrap_or_default(self) -> T

Get contained data, consume self. Return default value for type if this is empty.

pub fn set_default<'a>(&'a mut self) -> &'a mut T

Initialize this object with default value. This operation can be more efficient then construction of clear element, because it may reuse previously contained object.

Trait Implementations

impl<'a, T> IntoIterator for &'a SingularField<T>

type Item = &'a T

The type of the elements being iterated over.

type IntoIter = IntoIter<&'a T>

Which kind of iterator are we turning this into?

fn into_iter(self) -> IntoIter<&'a T>

Creates an iterator from a value.

impl<T: Eq> Eq for SingularField<T>

impl<T: Default> Default for SingularField<T>

fn default() -> SingularField<T>

Returns the "default value" for a type.

impl<T: PartialEq> PartialEq<SingularField<T>> for SingularField<T>

fn eq(&self, other: &SingularField<T>) -> 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: Clone + Default> Clone for SingularField<T>

fn clone(&self) -> SingularField<T>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<T: Debug> Debug for SingularField<T>

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

Formats the value using the given formatter.

impl<T: Hash> Hash for SingularField<T>

fn hash<H: Hasher>(&self, state: &mut H)

Feeds this value into the given [Hasher].

fn hash_slice<H>(data: &[Self], state: &mut H) where     H: Hasher,

Feeds a slice of this type into the given [Hasher].