Generalized type constraints in Scala (without a PhD)I don’t know about you, but I knew about implicit parameter lists, implicit resolution, and even type bounds. But this funny <:< “sad-with-a-hat” 1 operator 2 was entirely new to me! Smart people 3 have written about it years ago, but it’s clear that we are talking about a feature which is not well-known and poorly documented, even though it is available since Scala 2.8. So this article is about f
<:<を使ってメソッド引数の型を限定する (例: IntもしくはBooleanもしくはString - Qiita
