Struct Ctx 

pub struct Ctx<'a, D: DataT + ?Sized> { /* private fields */ }

Filter execution context.

Implementations

impl<'a, D: DataT> Ctx<'a, D>

pub fn new(data: D::Data<'a>, vars: Vars<D::V<'a>>) -> Self

Construct a fresh context.

If you do not use any filters that need custom data (such as inputs) and your value type has a 'static lifetime, then you may use crate::data::JustLut as DataT.

pub fn data(&self) -> &D::Data<'a>

Return global data.

impl<'a, D: DataT> Ctx<'a, D>

pub fn pop_var(&mut self) -> D::V<'a>

Remove the latest bound variable from the context.

This is useful for writing Native filters.

pub fn pop_fun(&mut self) -> (Id, Self)

Remove the latest bound function from the context.

This is useful for writing Native filters.

Trait Implementations

impl<'a, D: DataT> Clone for Ctx<'a, D>

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.