Trait EnvVarSource 

pub trait EnvVarSource {
    // Required method
    fn var(&self, key: &str) -> Option<String>;
}

Trait for implementing custom environment variable sources. This is useful if you want to source environment variables from somewhere other than std::env::var.

Required Methods

fn var(&self, key: &str) -> Option<String>

Look up the variable in the source.

Implementations on Foreign Types

impl EnvVarSource for BTreeMap<&str, &str>

fn var(&self, key: &str) -> Option<String>

impl EnvVarSource for BTreeMap<String, String>

fn var(&self, key: &str) -> Option<String>

impl EnvVarSource for HashMap<&str, &str>

fn var(&self, key: &str) -> Option<String>

impl EnvVarSource for HashMap<String, String>

fn var(&self, key: &str) -> Option<String>

Implementors

impl EnvVarSource for Env