Struct Map 

pub struct Map<T> {
    pub map: HashMap<String, T>,
    pub if_none: Option<Box<T>>,
    pub else: Option<Box<T>>,
}

Allows semantics similar to HashMap<Option<String>, _> without having to convert Option<&str>s to Option<String>s.

Also has Self::else to specify a return value when a key isn’t otherwise found.

Fields

map: HashMap<String, T>

The map from Some to T.

if_none: Option<Box<T>>

The map from None to T.

else: Option<Box<T>>

The value to return when a value is otherwise not found.

Implementations

impl<T> Map<T>

pub fn with_capacity(capacity: usize) -> Self

HashMap::with_capacity.

pub fn get<U: AsRef<str>>(&self, key: Option<U>) -> Option<&T>

If Some, returns the corresponding value from Self::map.

If None, returns the value of Self::if_none.

If either of the above return None, returns the value of Self::else.

Trait Implementations

impl<T: Clone> Clone for Map<T>

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

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<T: Debug> Debug for Map<T>

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

Formats the value using the given formatter.

impl<T> Default for Map<T>

fn default() -> Self

Returns the “default value” for a type.

impl<'de, T> Deserialize<'de> for Map<T>

where T: Deserialize<'de>,

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl<T, const N: usize> From<[(Option<String>, T); N]> for Map<T>

fn from(value: [(Option<String>, T); N]) -> Self

Converts to this type from the input type.

impl<T, const N: usize> From<[(String, T); N]> for Map<T>

fn from(value: [(String, T); N]) -> Self

Converts to this type from the input type.

impl<T> From<HashMap<Option<String>, T>> for Map<T>

fn from(value: HashMap<Option<String>, T>) -> Self

Converts to this type from the input type.

impl<T> From<HashMap<String, T>> for Map<T>

fn from(value: HashMap<String, T>) -> Self

Converts to this type from the input type.

impl<T> FromIterator<(Option<String>, T)> for Map<T>

fn from_iter<I: IntoIterator<Item = (Option<String>, T)>>(iter: I) -> Self

Creates a value from an iterator.

impl<T> FromIterator<(String, T)> for Map<T>

fn from_iter<I: IntoIterator<Item = (String, T)>>(iter: I) -> Self

Creates a value from an iterator.

impl<T: PartialEq> PartialEq for Map<T>

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

Tests for self and other values to be equal, and is used by ==.

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

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

impl<T> Serialize for Map<T>

where T: Serialize,

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl<T: Eq> Eq for Map<T>

impl<T> StructuralPartialEq for Map<T>