Function malachite_base::options::option_from_str

pub fn option_from_str<T: FromStr>(src: &str) -> Option<Option<T>>

Converts a string to an Option<T>, where T implements FromStr.

If the string does not represent a valid Option<T>, None is returned.

If T does not implement FromStr, try using option_from_str_custom instead.

Examples

use malachite_base::options::option_from_str;

assert_eq!(option_from_str::<bool>("Some(false)"), Some(Some(false)));
assert_eq!(option_from_str::<u32>("Some(5)"), Some(Some(5)));
assert_eq!(option_from_str::<u32>("None"), Some(None));
assert_eq!(option_from_str::<u32>("Some(hi)"), None);
assert_eq!(option_from_str::<bool>("abc"), None);