Trait StringLookup 

pub trait StringLookup {
    // Required method
    fn lookup(&mut self, v: &str) -> Option<String>;
}

A simple lookup function, used by the StringSource.

Required Methods

fn lookup(&mut self, v: &str) -> Option<String>

Looks up the variable v and returns its value.

Returns None if the variable cannot be found.

Dyn Compatibility

This trait is dyn compatible.

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

Implementations on Foreign Types

impl StringLookup for HashMap<String, String>

fn lookup(&mut self, v: &str) -> Option<String>

Implementors

impl StringLookup for EnvLookup