Trait ContextProvider 

pub trait ContextProvider {
    // Required methods
    fn get(&self, key: &str) -> Option<&Value>;
    fn to_context(&self) -> Context;
}

A borrowed source of values used while evaluating an expression.

Implementing this trait allows callers and custom functions to provide context values without cloning an entire Context for each evaluation.

Required Methods

fn get(&self, key: &str) -> Option<&Value>

fn to_context(&self) -> Context

Materialize the values visible to the expression.

Evaluation only calls this when an expression accesses $env.

Dyn Compatibility

This trait is dyn compatible.

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

Implementors

impl ContextProvider for Context