{"id":2103,"date":"2010-02-28T16:32:32","date_gmt":"2010-02-28T08:32:32","guid":{"rendered":"http:\/\/wp.chunhsin.idv.tw\/?p=2103"},"modified":"2010-02-28T16:32:32","modified_gmt":"2010-02-28T08:32:32","slug":"%e7%b9%bc%e6%89%bf%e8%88%87%e5%a4%9a%e9%87%8d%e7%b9%bc%e6%89%bf%e5%ad%b8%e7%bf%92%e5%bf%83%e5%be%97","status":"publish","type":"post","link":"https:\/\/wp.chunhsin.idv.tw\/?p=2103","title":{"rendered":"\u7e7c\u627f\u8207\u591a\u91cd\u7e7c\u627f\u5b78\u7fd2\u5fc3\u5f97"},"content":{"rendered":"

1.\u5b50\u985e\u5225\u4e0d\u80fd\u5b58\u53d6\u7236\u985e\u5225\u7684private<\/strong>\u6210\u54e1\u8cc7\u6599\u53ca\u51fd\u6578\u3002\u6240\u4ee5\u4e00\u6a23\u662f\u900f\u904epublic<\/strong>\u7684\u6210\u54e1\u51fd\u6578\u4f86\u8a2d\u5b9a\u8ddf\u53d6\u5f97private<\/strong>\u7684\u6210\u54e1\u8cc7\u6599\u3002<\/p>\n

2.\u5b50\u985e\u5225\u80fd\u5920\u7e7c\u627f\u7236\u985e\u5225\u7684\u6240\u6709\u6210\u54e1\u51fd\u6578\u53ca\u8cc7\u6599\uff0c\u4f46\u4e26\u4e0d\u5305\u62ec
\n(1)\u7236\u985e\u5225\u7684\u5efa\u69cb\u5b50\u548c\u89e3\u69cb\u5b50
\n(2)\u7236\u985e\u5225\u7684\u670b\u53cb\u95dc\u4fc2
\n(3)\u7236\u985e\u5225\u7684\u6307\u5b9a\u904b\u7b97\u5b50<\/p>\n

3.\u5ba3\u544a\u5b50\u985e\u5225\u7684\u7e7c\u627f\u8a9e\u6cd5\u88e1\uff0c\u5b58\u53d6\u63a7\u5236\u7684\u4fee\u98fe\u5b50\u7684\u610f\u601d\u662f\u4ee3\u8868\u8981\u5c07\u7236\u985e\u5225\u7684\u6240\u6709\u6210\u54e1\u51fd\u6578\u653e\u5728\u5b50\u985e\u5225\u7684\u54ea\u4e00\u5340\u584a\u88e1\uff0c\u5982\u679c(\u5b58\u53d6\u63a7\u5236)\u4fee\u98fe\u5b50\u662fprotected<\/strong>\uff0c\u90a3\u4ee3\u8868\u7236\u985e\u5225\u7684\u6240\u6709\u6210\u54e1\u8cc7\u6599\u53ca\u51fd\u6578\u90fd\u653e\u5728\u5b50\u985e\u5225\u7684protected<\/strong>\u5340\u584a\uff1b\u5982\u679c\u4fee\u98fe\u5b50\u662fprivate<\/strong>\uff0c\u6240\u6709\u7684\u7236\u985e\u5225\u6210\u54e1\u8cc7\u6599\u53ca\u51fd\u6578\u90fd\u5728private<\/strong>\u5340\u584a\uff1b\u800c\u5982\u679c\u662fpublic<\/strong>\uff0c\u7236\u985e\u5225\u7684public<\/strong>\u9084\u662fpublic<\/strong>\uff0c\u4f46protected<\/strong>\u5247\u662fprotected<\/strong>\u3002\u81f3\u65bc\u7236\u985e\u5225\u539f\u672c\u7684private<\/strong>\u5340\u584a\uff0c\u7121\u6cd5\u4f7f\u7528\u4f55\u7a2e\u7e7c\u627f\u4fee\u98fe\u5b50\uff0c\u5b50\u985e\u5225\u7686\u7121\u6cd5\u76f4\u63a5\u5b58\u53d6\u3002<\/p>\n

4.\u8986\u5beb\u7236\u985e\u5225\u7684\u6210\u54e1\u51fd\u6578\uff1a\u5c31\u662f\u6539\u5beb\u7684\u610f\u601d\uff0c\u800c\u4e14\u662f\u5728\u51fd\u6578\u540d\u7a31\u76f8\u540c\u3001\u53c3\u6578\u5217\u7684\u53c3\u6578\u6578\u76ee\u53ca\u578b\u614b\u76f8\u540c\u53ca\u50b3\u56de\u578b\u614b\u76f8\u540c\u7684\u72c0\u614b\u4e0b\uff0c\u5728\u5b50\u985e\u5225\u91cd\u65b0\u5b9a\u7fa9\u4e00\u500b\u6210\u54e1\u51fd\u6578\u3002\u5982\u679c\u4e0a\u8ff0\u6709\u4e00\u689d\u4ef6\u4e0d\u76f8\u540c\u5c31\u6703\u8b8a\u6210\u65b0\u51fd\u6578\u6216\u8005\u662f\u51fd\u6578\u904e\u8f09\u3002<\/p>\n

5.\u96b1\u85cf\u7236\u985e\u5225\u7684\u6210\u54e1\u8cc7\u6599\uff1a\u53ea\u8981\u5728\u5b50\u985e\u5225\u5b9a\u7fa9\u4e00\u500b\u8207\u7236\u985e\u5225\u6210\u54e1\u8cc7\u6599\u540c\u540d\u8b8a\u6578\u5373\u53ef\uff0c\u8b8a\u6578\u578b\u614b\u53ef\u4e0d\u540c\u3002\u7136\u5f8c\u5728\u5b50\u985e\u5225\u88e1\u5c07\u9019\u500b\u8207\u7236\u985e\u5225\u540c\u540d\u7684\u8b8a\u6578\u653e\u5728private<\/strong>\u5340\u584a\uff0c\u9019\u6a23\u4e00\u4f86\uff0c\u7121\u8ad6\u539f\u672c\u7236\u985e\u5225\u7684\u6210\u54e1\u8cc7\u6599\u662f\u5426\u70bapublic<\/strong>\uff0c\u900f\u904e\u9019\u500b\u7e7c\u627f\u5b50\u985e\u5225\u5efa\u7acb\u7684\u7269\u4ef6\u5c07\u7121\u6cd5\u518d\u4f7f\u7528\u9019\u500b\u540c\u540d\u8b8a\u6578\uff0c\u6240\u4ee5\u7a31\u4e4b\u70ba\u96b1\u85cf\u3002<\/p>\n

6.\u985e\u5225\u7684\u578b\u614b\u8f49\u63db\u8207\u6aa2\u67e5
\n\u25a0\u7269\u4ef6\u578b\u614b\u8f49\u63db\u904b\u7b97\u5b50
\n(1)static_cast<\/strong><\u985e\u5225*>(\u904b\u7b97\u5f0f)
\n(2)const_cast<\/strong><\u985e\u5225*>(\u904b\u7b97\u5f0f)
\n(3)dynamic_cast<\/strong><\u985e\u5225*>(\u904b\u7b97\u5f0f)
\n(4)reinerpret_cast<\/strong><\u985e\u5225*>(\u904b\u7b97\u5f0f)
\n\u25a0static_case<\/strong>\u6703\u76f4\u63a5\u8f49\u63db\u578b\u614b\uff0c\u5982\u679c\u578b\u614b\u4e0d\u76f8\u95dc\uff0c\u7de8\u8b6f\u6642\u6703\u51fa\u73fe\u932f\u8aa4\u3002\u901a\u5e38\u53ea\u80fd\u5f9e\u5b50\u985e\u5225\u7269\u4ef6\u8f49\u63db\u6210\u7236\u985e\u5225\u7269\u4ef6\uff0c\u800c\u4e0d\u80fd\u5f9e\u7236\u985e\u5225\u7269\u4ef6\u8f49\u63db\u6210\u5b50\u985e\u5225\u7269\u4ef6\uff0c\u56e0\u70ba\u7236\u985e\u5225\u4e0d\u5305\u62ec\u5b50\u985e\u5225\u3002
\n\u25a0const_case<\/strong>\u6703\u53d6\u6d88\u5e38\u6578\u7269\u4ef6\u7684\u552f\u8b80\u5c6c\u6027\u3002\u5df2\u5ba3\u544a\u7684\u5e38\u6578\u6307\u6a19\u7269\u4ef6\u4e0d\u80fd\u518d\u4fee\u6539\u4efb\u4f55\u6210\u54e1\uff0c\u53ea\u80fd\u5728\u7d93\u904e\u8f49\u63db\u5f8c\uff0c\u6307\u5b9a\u7d66\u53e6\u4e00\u500b\u975e\u5e38\u6578\u7269\u4ef6\u6307\u6a19\uff0c\u900f\u904e\u9019\u500b\u6307\u6a19\u4f86\u4fee\u6539\u6210\u54e1\u3002\u56e0\u70ba\u5169\u500b\u6307\u6a19\u6307\u5411\u540c\u4e00\u500b\u8a18\u61b6\u9ad4\u4f4d\u5740\uff0c\u6240\u4ee5\u4fee\u6539\u7684\u7269\u4ef6\u4e5f\u662f\u540c\u4e00\u500b\u3002
\n\u25a0dynamic_cast<\/strong>\u6703\u5728\u57f7\u884c\u968e\u6bb5\u6aa2\u67e5\u578b\u614b\u80fd\u4e0d\u80fd\u8f49\u63db\uff0c\u4e0d\u884c\u7684\u8a71\u6703\u50b3\u56deNULL<\/strong>\u3002\u548cstatic_cast<\/strong>\u7684\u5dee\u5225\u5c31\u662f\u53ef\u4ee5\u578b\u614b\u4e0d\u540c\u53ef\u4ee5\u901a\u904e\u7de8\u8b6f\u968e\u6bb5\uff0c\u4f46\u4e0d\u80fd\u8f49\u63db\u4ecd\u7136\u4e0d\u80fd\u8f49\u63db\u3002
\n\u25a0reinerpret_cast<\/strong>\u8f49\u63db\u6642\u6703\u5c07\u7269\u4ef6\u5167\u76f8\u540c\u578b\u614b\u7684\u6210\u54e1\u8cc7\u6599\u4f9d\u5e8f\u653e\u7f6e\u5230\u65b0\u6307\u6a19\u7269\u4ef6\u5167\u3002\u5169\u8005\u7684\u6210\u54e1\u8cc7\u6599\u6578\u91cf\u4e0d\u5fc5\u76f8\u540c\u3002<\/p>\n

7.\u985e\u5225\u7684\u578b\u614b\u8f49\u63db\u5fc5\u9808\u4ee5\u6307\u6a19\u7684\u65b9\u5f0f\u4f86\u64cd\u4f5c<\/p>\n

8.\u5b50\u985e\u5225\u7684\u7269\u4ef6\u53ef\u4ee5\u4f7f\u7528\u7236\u985e\u5225\u7684\u6307\u6a19\u4f86\u5132\u5b58\u3002<\/p>\n

9.typeid<\/strong>\u904b\u7b97\u5b50\u53ef\u4ee5\u7528\u4f86\u5224\u65b7\u578b\u614b\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

1.\u5b50\u985e\u5225\u4e0d\u80fd\u5b58\u53d6\u7236\u985e\u5225\u7684private\u6210\u54e1\u8cc7\u6599\u53ca\u51fd\u6578\u3002\u6240\u4ee5\u4e00\u6a23\u662f\u900f\u904epublic\u7684\u6210\u54e1\u51fd\u6578\u4f86\u8a2d\u5b9a\u8ddf\u53d6\u5f97pri … \u95b1\u8b80\u5168\u6587\u3008\u7e7c\u627f\u8207\u591a\u91cd\u7e7c\u627f\u5b78\u7fd2\u5fc3\u5f97\u3009<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[172],"tags":[173],"class_list":["post-2103","post","type-post","status-publish","format-standard","hentry","category-cc","tag-173"],"_links":{"self":[{"href":"https:\/\/wp.chunhsin.idv.tw\/index.php?rest_route=\/wp\/v2\/posts\/2103","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wp.chunhsin.idv.tw\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wp.chunhsin.idv.tw\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wp.chunhsin.idv.tw\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/wp.chunhsin.idv.tw\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2103"}],"version-history":[{"count":4,"href":"https:\/\/wp.chunhsin.idv.tw\/index.php?rest_route=\/wp\/v2\/posts\/2103\/revisions"}],"predecessor-version":[{"id":2107,"href":"https:\/\/wp.chunhsin.idv.tw\/index.php?rest_route=\/wp\/v2\/posts\/2103\/revisions\/2107"}],"wp:attachment":[{"href":"https:\/\/wp.chunhsin.idv.tw\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2103"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wp.chunhsin.idv.tw\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2103"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wp.chunhsin.idv.tw\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2103"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}