{"provider_name":"Hatena Blog","author_name":"yohhoy","width":"100%","height":"190","title":"decltype(e)\u3068decltype((e))\u306e\u30ad\u30e2\u30c1","url":"https://yohhoy.hatenadiary.jp/entry/20200817/p1","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fyohhoy.hatenadiary.jp%2Fentry%2F20200817%2Fp1\" title=\"decltype(e)\u3068decltype((e))\u306e\u30ad\u30e2\u30c1 - yohhoy\u306e\u65e5\u8a18\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","published":"2020-08-17 00:00:00","blog_title":"yohhoy\u306e\u65e5\u8a18","version":"1.0","description":"\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9eC++\u306b\u304a\u3051\u308b decltype\u6307\u5b9a\u5b50(decltype-specifier) \u306e\u632f\u308b\u821e\u3044\u306b\u3064\u3044\u3066\u30e1\u30e2\u3002 int x = 42; // \u62ec\u5f27\u306a\u3057\u306e\u5909\u6570\u540d x decltype( x ) y = x; // int \u578b // \u62ec\u5f27\u4ed8\u304d\u306e\u5f0f (x) decltype((x)) z = x; // int& \u578b \u4e00\u898b\u3059\u308b\u3068\u5947\u5999\u306b\u601d\u3048\u308bdecltype(e)\u578b\u5c0e\u51fa\u30eb\u30fc\u30eb\u306f\u3001\u300c\u5f0fe\u306e\u578b\u5ba3\u8a00\u3092\u63a2\u3059\u300d\u3068\u3044\u3046\u6307\u91dd\u306b\u57fa\u3065\u3044\u3066\u3044\u308b\u3002 \u5909\u6570\u540dx\uff1a\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u4e0a\u306b\u76f4\u63a5\u767b\u5834\u3059\u308b\u5909\u6570x\u5ba3\u8a00\u6642\u306e\u578bint\u3068\u306a\u308b\u3002 \u5f0f(x)\uff1a\u5f0f(x)\u306f\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u4e0a\u306e\u5ba3\u8a00\u306b\u306f\u73fe\u308c\u306a\u3044\u3002\u5f0f(x)\u306e\u5de6\u8fba\u5024\u3068\u3057\u3066\u306e\u6027\u8cea(lvalu\u2026","image_url":null,"type":"rich","author_url":"https://blog.hatena.ne.jp/yohhoy/","categories":["C++"],"blog_url":"https://yohhoy.hatenadiary.jp/","provider_url":"https://hatena.blog"}