[−][src]Function envmnt::get_set
pub fn get_set<K: AsRef<OsStr>, V: AsRef<OsStr>>(
key: K,
value: V
) -> Option<String>
Sets the environment variable value and returns the previous value.
Arguments
key
- The environment variable namevalue
- The environment variable value
Example
fn main() { envmnt::set("MY_ENV_VAR", "SOME VALUE"); assert!(envmnt::is_equal("MY_ENV_VAR", "SOME VALUE")); let pre_value = envmnt::get_set("MY_ENV_VAR", "NEW VALUE"); let value = envmnt::get_or("MY_ENV_VAR", "DEFAULT_VALUE"); assert_eq!(value, "NEW VALUE"); assert_eq!(pre_value.unwrap(), "SOME VALUE"); }