{"rsdb":{"rid":"244435","subhead":"","postdate":"0","aid":"168210","fid":"49","uid":"1","topic":"1","content":"<div id=\"Article\"> \n <p>static_cast\u6700\u63a5\u8fd1\u4e8eC\u98ce\u683c\u8f6c\u6362\uff0c\u4f46\u5728\u65e0\u5173\u7c7b\u6307\u9488\u8f6c\u6362\u65f6\uff0c\u7f16\u8bd1\u5668\u4f1a\u62a5\u9519\uff0c\u63d0\u5347\u4e86\u5b89\u5168\u6027;<\/p> \n <p>double d=3.14159265;<\/p> \n <p>int i = static_cast(d);<\/p> \n <p>dynamic_cast\u8981\u6c42\u8f6c\u6362\u7c7b\u578b\u5fc5\u987b\u662f\u6307\u9488\u6216\u5f15\u7528\uff0c\u4e14\u5728\u4e0b\u884c\u8f6c\u6362\u65f6\u8981\u6c42\u57fa\u7c7b\u662f\u591a\u6001\u7684\uff0c\u5982\u679c\u53d1\u73b0\u4e0b\u884c\u8f6c\u6362\u4e0d\u5b89\u5168\uff0cdynamic_cast\u8fd4\u56de\u4e00\u4e2anull\u6307\u9488\uff0cdynamic_cast\u603b\u662f\u8ba4\u4e3avoid*\u4e4b\u95f4\u7684\u8f6c\u6362\u662f\u5b89\u5168\u7684;<\/p> \n <p>reinterpret_cast\u53ef\u4ee5\u5bf9\u65e0\u5173\u7c7b\u6307\u9488\u8fdb\u884c\u8f6c\u6362\uff0c\u751a\u81f3\u53ef\u4ee5\u76f4\u63a5\u5c06\u6574\u578b\u503c\u8f6c\u6210\u6307\u9488\uff0c\u8fd9\u79cd\u8f6c\u6362\u662f\u5e95\u5c42\u7684\uff0c\u6709\u8f83\u5f3a\u7684\u5e73\u53f0\u4f9d\u8d56\u6027\uff0c\u53ef\u79fb\u690d\u6027\u5dee;<\/p> \n <p>class A {};<\/p> \n <p>class B {};<\/p> \n <p>A * a = new A;<\/p> \n <p>B * b = reinterpret_cast<\/p> \n<\/div>","orderid":"0","title":"c++\u56db\u4e2a\u5f3a\u5236\u8f6c\u6362\u5b9e\u4f8b\u8bb2\u89e3","smalltitle":"","mid":"0","fname":"c++\u7f16\u7a0b\u57fa\u7840","special_id":"0","bak_id":"0","info":"0","hits":"158","pages":"1","comments":"0","posttime":"2018-02-13 12:56:07","list":"1518497767","username":"admin","author":"","copyfrom":"","copyfromurl":"","titlecolor":"","fonttype":"0","titleicon":"0","picurl":"https:\/\/www.cppentry.com\/upload_files\/","ispic":"0","yz":"1","yzer":"","yztime":"0","levels":"0","levelstime":"0","keywords":"<A HREF='https:\/\/www.cppentry.com\/do\/search.php?type=keyword&keyword=%C7%BF%D6%C6' target=_blank>\u5f3a\u5236<\/A> <A HREF='https:\/\/www.cppentry.com\/do\/search.php?type=keyword&keyword=%D7%AA%BB%BB' target=_blank>\u8f6c\u6362<\/A> <A HREF='https:\/\/www.cppentry.com\/do\/search.php?type=keyword&keyword=%CA%B5%C0%FD' target=_blank>\u5b9e\u4f8b<\/A> <A HREF='https:\/\/www.cppentry.com\/do\/search.php?type=keyword&keyword=%BD%B2%BD%E2' target=_blank>\u8bb2\u89e3<\/A>","jumpurl":"","iframeurl":"","style":"","template":"a:3:{s:4:\"head\";s:0:\"\";s:4:\"foot\";s:0:\"\";s:8:\"bencandy\";s:0:\"\";}","target":"0","ip":"113.87.122.142","lastfid":"0","money":"0","buyuser":"","passwd":"","allowdown":"","allowview":"","editer":"","edittime":"0","begintime":"0","endtime":"0","description":"c++\u56db\u4e2a\u5f3a\u5236\u8f6c\u6362\u5b9e\u4f8b\u8bb2\u89e3","lastview":"1714010732","digg_num":"3","digg_time":"1713560636","forbidcomment":"0","ifvote":"0","heart":"","htmlname":"","city_id":"0"},"page":"1"}