Struct idm::DefaultDash

pub struct DefaultDash<T: Default>(pub T);

Wrapper that represents Default values with "-", allowing them in contexts that cannot represent an empty value.

use idm::DefaultDash;

assert_eq!(
    idm::from_str::<DefaultDash<String>>("-").unwrap(),
    DefaultDash(String::default())
);
assert_eq!(
    idm::from_str::<DefaultDash<String>>("xyzzy").unwrap(),
    DefaultDash("xyzzy".to_string())
);

assert_eq!(
    idm::to_string(&DefaultDash("xyzzy".to_string())).unwrap(),
    "xyzzy"
);
assert_eq!(
    idm::to_string(&DefaultDash(String::default())).unwrap(),
    "-"
);

Tuple Fields

0: T

Trait Implementations

impl<T: Clone + Default> Clone for DefaultDash<T>

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

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<T: Debug + Default> Debug for DefaultDash<T>

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

Formats the value using the given formatter.

impl<T: Default + Default> Default for DefaultDash<T>

fn default() -> DefaultDash<T>

Returns the “default value” for a type.

impl<T: Default> Deref for DefaultDash<T>

type Target = T

The resulting type after dereferencing.

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

Dereferences the value.

impl<T: Default> DerefMut for DefaultDash<T>

fn deref_mut(&mut self) -> &mut Self::Target

Mutably dereferences the value.

impl<'de, T: DeserializeOwned + Default> Deserialize<'de> for DefaultDash<T>

fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>where
    D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl<T: Hash + Default> Hash for DefaultDash<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.

impl<T: Ord + Default> Ord for DefaultDash<T>

fn cmp(&self, other: &DefaultDash<T>) -> 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) -> Selfwhere
    Self: PartialOrd<Self>,

Restrict a value to a certain interval.

impl<T: PartialEq + Default> PartialEq<DefaultDash<T>> for DefaultDash<T>

fn eq(&self, other: &DefaultDash<T>) -> bool

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

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

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<T: PartialOrd + Default> PartialOrd<DefaultDash<T>> for DefaultDash<T>

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

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

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

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

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

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

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

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

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: Serialize + Default + PartialEq> Serialize for DefaultDash<T>

fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>where
    S: Serializer,

Serialize this value into the given Serde serializer.

impl<T: Copy + Default> Copy for DefaultDash<T>

impl<T: Eq + Default> Eq for DefaultDash<T>

impl<T: Default> StructuralEq for DefaultDash<T>

impl<T: Default> StructuralPartialEq for DefaultDash<T>