{"categories":["Scala"],"url":"https://blog1.mammb.com/entry/20100503/1272999352","type":"rich","title":"\u578b\u30d1\u30e9\u30e1\u30fc\u30bf\u306e\u5883\u754c\u3068\u306f","width":"100%","published":"2010-05-03 03:55:52","blog_url":"https://blog1.mammb.com/","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fblog1.mammb.com%2Fentry%2F20100503%2F1272999352\" title=\"\u578b\u30d1\u30e9\u30e1\u30fc\u30bf\u306e\u5883\u754c\u3068\u306f - A Memorandum\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","version":"1.0","height":"190","author_name":"Naotsugu","author_url":"https://blog.hatena.ne.jp/Naotsugu/","blog_title":"A Memorandum","provider_url":"https://hatena.blog","image_url":null,"provider_name":"Hatena Blog","description":"\u30d1\u30e9\u30e1\u30fc\u30bf\u5883\u754c \u578b\u30d1\u30e9\u30e1\u30fc\u30bf\u306b\u306f\u4ee5\u4e0b\u306e3\u3064\u306e\u5883\u754c\u304c\u8a2d\u5b9a\u3067\u304d\u308b\u3002 \u4e0a\u9650\u5883\u754c(upper bound) \u4f8b hoge[A <: T] A \u304c T \u306e\u30b5\u30d6\u30bf\u30a4\u30d7\u3067\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044 \u4e0b\u9650\u5883\u754c(lower bound) \u4f8b hoge[A >: T] A \u306f T \u306e\u30b9\u30fc\u30d1\u30fc\u30bf\u30a4\u30d7\u3067\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044 \u53ef\u8996\u5883\u754c(view bound) \u4f8b hoge[A A \u304c T \u3068\u3057\u3066\u6271\u3048\u308b(\u6697\u9ed9\u306e\u578b\u5909\u63db\u306b\u3088\u308a\u5909\u63db\u53ef\u80fd\u307e\u305f\u306f A \u304c T \u306e\u30b5\u30d6\u30bf\u30a4\u30d7) \u901a\u5e38\u306e\u578b\u30d1\u30e9\u30e1\u30fc\u30bf \u666e\u901a\u306e\u578b\u30d1\u30e9\u30e1\u30fc\u30bf\u304b\u3089\u304a\u3055\u3089\u3044\u3002\u4ee5\u4e0b\u306e Holder \u3092\u8003\u3048\u308b\u3002 class Holder[A] { private var contents:A = \u2026"}