{"url":"https://yohhoy.hatenadiary.jp/entry/20210604/p1","type":"rich","blog_url":"https://yohhoy.hatenadiary.jp/","version":"1.0","blog_title":"yohhoy\u306e\u65e5\u8a18","provider_name":"Hatena Blog","width":"100%","height":"190","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fyohhoy.hatenadiary.jp%2Fentry%2F20210604%2Fp1\" title=\"#elifdef\u3068#elifndef - 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>","image_url":null,"author_name":"yohhoy","published":"2021-06-04 00:00:00","provider_url":"https://hatena.blog","author_url":"https://blog.hatena.ne.jp/yohhoy/","description":"\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9eC/C++\u306e\u305d\u308c\u305e\u308c\u6b21\u671f\u30d0\u30fc\u30b8\u30e7\u30f3C2x(C23)/C++2b(C++23)\u3067\u306f\u3001\u65b0\u3057\u3044\u30d7\u30ea\u30d7\u30ed\u30bb\u30c3\u30b5\u30c7\u30a3\u30ec\u30af\u30c6\u30a3\u30d6#elifdef\u3068#elifndef\u304c\u8ffd\u52a0\u3055\u308c\u308b\u4e88\u5b9a\u3002*1 #ifdef identifier\uff1a#if defined(identifier)\u3068\u7b49\u4fa1 #ifndef identifier\uff1a#if !defined(identifier)\u3068\u7b49\u4fa1 #elifdef identifier\uff1a#elif defined(identifier)\u3068\u7b49\u4fa1 #elifndef identifier\uff1a#elif !defined(identifier)\u3068\u7b49\u4fa1 \u304a\u307e\u3051\uff1a\u672c\u63d0\u6848\u306b\u5bfe\u3059\u308b\u2026","categories":["C","C++","C2x","C++2b"],"title":"#elifdef\u3068#elifndef"}