{"published":"2009-02-23 01:15:17","image_url":null,"type":"rich","url":"https://marsonic.hatenadiary.org/entry/20090223/1235405717","width":"100%","title":"Perl - eval()\u3068\u306f\uff1fwarn\u3001die\u3082\u3002","blog_title":"marsonic\u306e\u65e5\u8a18","author_url":"https://blog.hatena.ne.jp/marsonic/","version":"1.0","blog_url":"https://marsonic.hatenadiary.org/","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fmarsonic.hatenadiary.org%2Fentry%2F20090223%2F1235405717\" title=\"Perl - eval()\u3068\u306f\uff1fwarn\u3001die\u3082\u3002 - marsonic\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","categories":["Perl"],"provider_name":"Hatena Blog","author_name":"marsonic","provider_url":"https://hatena.blog","description":"\u30fbperl eval (Google\u691c\u7d22\u7d50\u679c) \u30fbPerl\u30ea\u30d5\u30a1\u30ec\u30f3\u30b9 eval eval() eval(expr)\u3084eval{...}\u3067\u3001\u30d6\u30ed\u30c3\u30af\u3084\u62ec\u5f27\u5185\u3092Perl\u306e\u30b9\u30af\u30ea\u30d7\u30c8\u3068\u307f\u306a\u3057\u3066\u5b9f\u884c\u3059\u308b\u3002\u6700\u5f8c\u306b\u5b9f\u884c\u3057\u305f\u547d\u4ee4\u306e\u7d50\u679c\u304c\u623b\u308a\u5024\u3068\u3057\u3066\u8fd4\u3055\u308c\u308b\u3002 \u30a8\u30e9\u30fc\u3084die\u3060\u3063\u305f\u3089\u3001undefine\u3092\u8fd4\u3057\u3001$@\u306b\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u683c\u7d0d\u3059\u308b\u3002eval\u3092\u7528\u3044\u3066\u3001Perl\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u7570\u5e38\u7d42\u4e86\u3092\u9632\u3050\u3053\u3068\u304c\u3067\u304d\u308b\u3002 print eval(\"3 * (5 + 3)\").\"\\n\"; $x = 10; $y = 0; $ans = eval{ $x / $y; };#0\u3067\u5272\u3063\u305f\u5834\u5408 if($@) { warn \"WAR\u2026"}