Trait View 

pub trait View {
    // Required methods
    fn shape(&self) -> &dyn Shape;
    fn get(&self, key: Key) -> Value<'_>;

    // Provided method
    fn call(
        &self,
        key: Key,
        args: &[Value<'_>],
        with: &mut dyn FnMut(Value<'_>),
    ) { ... }
}

What a template reads.

Required Methods

fn shape(&self) -> &dyn Shape

The names this view answers.

fn get(&self, key: Key) -> Value<'_>

A field by key. The hot path: no allocation.

Provided Methods

fn call(&self, key: Key, args: &[Value<'_>], with: &mut dyn FnMut(Value<'_>))

A method with arguments (variations.options("size")). The result is passed to with, so it may borrow a value computed for the call. The default answers Value::Absent.

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors

impl View for Fields<'_>