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var_parse_opt

switchy_env::simulator

Function var_parse_opt 

Source 
pub fn var_parse_opt<T>(name: &str) -> Result<Option<T>>
where
    T: FromStr,
    T::Err: Display,
Expand description

Get an optional environment variable parsed as a specific type

§Returns

  • Ok(Some(value)) if the variable exists and parses successfully
  • Ok(None) if the variable doesn’t exist
  • Err(EnvError::ParseError) if the variable exists but can’t be parsed

§Errors

  • If the environment variable exists but cannot be parsed to the target type