Function envmnt::checkpoint
source · [−]pub fn checkpoint() -> Checkpoint
Expand description
Create a new checkpoint, for the current environment of the process,
at a later date a checkpoint can be restored using [Checkpoint::restore
], which will rollback
the environment to all values present at the time this function was called.
Example
fn main() {
envmnt::set("ENV_VAR", "123");
envmnt::set("ENV_VAR2", "345");
assert!(envmnt::is_equal("ENV_VAR", "123"));
assert!(envmnt::is_equal("ENV_VAR2", "345"));
assert!(!envmnt::exists("ENV_VAR3"));
let chk = envmnt::checkpoint();
envmnt::set("ENV_VAR", "1234");
envmnt::remove("ENV_VAR2");
envmnt::set("ENV_VAR3", "654");
assert!(envmnt::is_equal("ENV_VAR", "1234"));
assert!(!envmnt::exists("ENV_VAR2"));
assert!(envmnt::is_equal("ENV_VAR3", "654"));
chk.restore();
assert!(envmnt::is_equal("ENV_VAR", "123"));
assert!(envmnt::is_equal("ENV_VAR2", "345"));
assert!(!envmnt::exists("ENV_VAR3"));
}