Enum ParamScope

pub enum ParamScope {
    Nothing,
    Just(BTreeMap<u64, Entry>),
}

ParameterScope

ParameterScope is a data structure that stores the current set of named parameters and their values. ParameterScope is used to manage the scope of named parameters, allowing parameters to be defined and used within a specific scope, and then restored to the previous scope when the scope is exited.

The parameter scope can be used to implement a variety of features, such as named parameters, default parameter values, and parameter inheritance.

Variants

Nothing

No parameters are defined in the current scope.

Just(BTreeMap<u64, Entry>)

The current scope contains a set of named parameters stored in Params.

Implementations

impl ParamScope

pub fn get_with_hash(&self, key: u64) -> Value

Get a parameter with a given hash key.

pub fn get<K>(&self, key: K) -> Value

where K: Into<String> + Clone + XXHashable,

Get a parameter with a given key.

pub fn add<T: Into<String>>(&mut self, expr: T)

pub fn keys(&self) -> Vec<String>

Get a list of all parameter keys.

pub fn enter(&mut self)

Enter a new parameter scope.

pub fn exit(&mut self)

Exit the current parameter scope.

Trait Implementations

impl Clone for ParamScope

fn clone(&self) -> ParamScope

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for ParamScope

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

Formats the value using the given formatter.

impl Default for ParamScope

fn default() -> Self

Returns the “default value” for a type.

impl<T: Into<String> + Clone> From<&Vec<T>> for ParamScope

fn from(value: &Vec<T>) -> Self

Converts to this type from the input type.

impl<K, V> ParamScopeOps<K, V> for ParamScope

where K: Into<String> + Clone + XXHashable + Debug, V: Into<Value> + TryFrom<Value> + for<'a> TryFrom<&'a Value> + Clone,

fn get_or_else(&self, key: K, default: V) -> V

Get a parameter or the default value if it doesn’t exist.

fn put(&mut self, key: K, val: V)

Put a parameter.

impl<V> ParamScopeOps<u64, V> for ParamScope

where V: Into<Value> + TryFrom<Value> + for<'a> TryFrom<&'a Value>,

fn put(&mut self, key: u64, val: V)

Put a parameter.

fn get_or_else(&self, key: u64, default: V) -> V