21/12/11 22:59:59.99 yVS9OnV5.net
>>279
Cowかな
let name: Cow<str> = arg1.map_or(Cow::Borrowed(DEFAULT_NAME), |s| Cow::Owned(s));
21/12/11 22:59:59.99 yVS9OnV5.net
>>279
Cowかな
let name: Cow<str> = arg1.map_or(Cow::Borrowed(DEFAULT_NAME), |s| Cow::Owned(s));