Macro macro_state::has_state
source · [−]has_state!() { /* proc-macro */ }
Expand description
Checks if an existing state value can be found for the specified key
.
Note that this function is infallible – it should never panic and will always return
true
or false
.
Example
write_state!("my key", "hey")
assert_eq!(has_state!("my key"), true);
assert_eq!(has_state!("unknown key"), false);