(T?, U?) | | T | N | |:-:|:-:|:-:| | U | o | o | | N | o | o | (edited)

7:50 AM

Either<T, U> | | T | N | |:-:|:-:|:-:| | U | | o | | N | o | |

7:50 AM

今作りたいもの Foo<T, U> | | T | N | |:-:|:-:|:-:| | U | o | o | | N | o | | (edited)