Struct FunctionSet 

pub struct FunctionSet<S> { /* private fields */ }

Collection of functions.

Implementations

impl<S> FunctionSet<S>

pub fn new() -> Self

Creates a new empty function set.

pub fn get(&self, name: &str) -> Option<&Rc<Function<S>>>

Returns the function with the given name.

pub fn len(&self) -> usize

Returns the number of functions in the set.

pub fn is_empty(&self) -> bool

Returns true if the set contains no functions.

pub fn define<F: Into<Rc<Function<S>>>>( &mut self, function: F, ) -> Result<Option<Rc<Function<S>>>, DefineError<S>>

Inserts a function into the set.

If a function with the same name already exists, it is replaced and returned unless it is read-only, in which case DefineError is returned.

pub fn unset( &mut self, name: &str, ) -> Result<Option<Rc<Function<S>>>, UnsetError<S>>

Removes a function from the set.

This function returns the previously defined function if it exists. However, if the function is read-only, UnsetError is returned.

pub fn iter(&self) -> Iter<'_, S>

Returns an iterator over functions in the set.

The order of iteration is not specified.

Trait Implementations

impl<S> Clone for FunctionSet<S>

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<S> Debug for FunctionSet<S>

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

Formats the value using the given formatter.

impl<S> Default for FunctionSet<S>

fn default() -> Self

Returns the “default value” for a type.

impl<'a, S> IntoIterator for &'a FunctionSet<S>

type Item = &'a Rc<Function<S>>

The type of the elements being iterated over.

type IntoIter = Iter<'a, S>

Which kind of iterator are we turning this into?

fn into_iter(self) -> Self::IntoIter

Creates an iterator from a value.