Struct Extensions

pub struct Extensions<'a> { /* private fields */ }

Holds data on all the Extensions which are active for a given evaluation.

This structure is intentionally not Clone because we can use it entirely by reference.

Implementations

impl Extensions<'static>

pub fn all_available() -> &'static Extensions<'static>

An Extensions object with static lifetime contain all available extensions.

pub fn none() -> &'static Extensions<'static>

Get a new Extensions with no extensions enabled.

impl<'a> Extensions<'a>

pub fn specific_extensions( extensions: &'a [Extension], ) -> Result<Extensions<'a>, ExtensionInitializationError>

Get a new Extensions with these specific extensions enabled.

pub fn ext_names(&self) -> impl Iterator<Item = &Name>

Get the names of all active extensions.

pub fn ext_types(&self) -> impl Iterator<Item = &Name>

Get all extension type names declared by active extensions.

(More specifically, all extension type names such that any function in an active extension could produce a value of that extension type.)

pub fn func( &self, name: &Name, ) -> Result<&ExtensionFunction, ExtensionFunctionLookupError>

Get the extension function with the given name, from these extensions.

Returns an error if the function is not defined by any extension

Trait Implementations

impl<'a> Debug for Extensions<'a>

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

Formats the value using the given formatter.