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omochimetaru 6/14/2017 4:43 AM
trait Foo { fn is_valid(&self) -> bool; fn is_invalid(&self) -> bool { !self.is_valid() } }
4:43 AM
https://rust-lang-ja.github.io/the-rust-programming-language-ja/1.6/book/traits.html#デフォルトメソッド
4:44 AM
これ？