Trait VariableProvider 

pub trait VariableProvider {
    // Required method
    fn get<'a>(&'a self, name: &str) -> Result<Cow<'a, str>, VarError>;
}

Trait for resolving ${env.VAR_NAME} style expansions.

Required Methods

fn get<'a>(&'a self, name: &str) -> Result<Cow<'a, str>, VarError>

Return the value to substitute for a ${env.VAR_NAME} style expansion.

Dyn Compatibility

This trait is dyn compatible.

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

Implementations on Foreign Types

impl VariableProvider for ()

fn get<'a>(&'a self, _name: &str) -> Result<Cow<'a, str>, VarError>

Implementors

impl VariableProvider for EnvVariables

impl VariableProvider for MapVariables