{"provider_url":"https://hatena.blog","author_name":"yohhoy","categories":["C","gcc","Clang","MSVC"],"version":"1.0","blog_title":"yohhoy\u306e\u65e5\u8a18","url":"https://yohhoy.hatenadiary.jp/entry/20190902/p1","title":"va_arg\u30de\u30af\u30ed\u306e\u5947\u5999\u306a\u5236\u9650\u4e8b\u9805","author_url":"https://blog.hatena.ne.jp/yohhoy/","provider_name":"Hatena Blog","published":"2019-09-02 00:00:00","blog_url":"https://yohhoy.hatenadiary.jp/","type":"rich","width":"100%","image_url":null,"html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fyohhoy.hatenadiary.jp%2Fentry%2F20190902%2Fp1\" title=\"va_arg\u30de\u30af\u30ed\u306e\u5947\u5999\u306a\u5236\u9650\u4e8b\u9805 - 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>","height":"190","description":"C\u8a00\u8a9e\u306e\u53ef\u5909\u5f15\u6570\u30ea\u30b9\u30c8\u30a2\u30af\u30bb\u30b9\u7528 va_arg \u30de\u30af\u30ed\u306b\u304a\u3051\u308b\u5947\u5999\u306a\u5236\u9650\u4e8b\u9805\u306b\u3064\u3044\u3066\u30e1\u30e2\u3002va_arg\u30de\u30af\u30ed\u306e\u7b2c\u4e8c\u5f15\u6570\u3078\u6307\u5b9a\u3059\u308b\u578b\u540d\u306b\u306f\u3001\u201c\u95a2\u6570\u30dd\u30a4\u30f3\u30bf\u578b\u201d \u3084 \u201c\u914d\u5217\u3078\u306e\u30dd\u30a4\u30f3\u30bf\u578b\u201d \u3092\u76f4\u63a5\u8a18\u8ff0\u3067\u304d\u306a\u3044\u3002\u305f\u3060\u3057typedef\u306b\u3088\u308b\u5225\u540d\u3067\u3042\u308c\u3070OK\u3002\u3053\u3093\u306a\u30b3\u30fc\u30c9\u66f8\u304f\u3084\u3064\u304a\u3089\u3093\u3084\u308d #include <stdarg.h> void f0(int x, ...) { va_list ap; va_start(ap, x); // NG: \u95a2\u6570\u30dd\u30a4\u30f3\u30bf\u578b int(*)(int) \u306f\u76f4\u63a5\u6307\u5b9a\u3067\u304d\u306a\u3044 int (*pf)(int) = va_arg(ap, int(*)(int)); // NG: \u914d\u5217\u2026"}