{"id":2350,"date":"2011-01-29T23:24:53","date_gmt":"2011-01-29T15:24:53","guid":{"rendered":"http:\/\/edsionte.com\/techblog\/?p=2350"},"modified":"2011-02-05T20:46:27","modified_gmt":"2011-02-05T12:46:27","slug":"%e5%a3%b0%e6%98%8e%e9%82%a3%e5%9b%9e%e4%ba%8b%e5%84%bf","status":"publish","type":"post","link":"http:\/\/edsionte.com\/techblog\/archives\/2350","title":{"rendered":"\u58f0\u660e\u90a3\u56de\u4e8b\u513f"},"content":{"rendered":"

C\u8bed\u8a00\u4e2d\u7684\u53d8\u91cf\u58f0\u660e\u662f\u8ba9\u7a0b\u5e8f\u5458\u6bd4\u8f83\u82e6\u607c\u7684\u4e00\u4ef6\u4e8b\uff0c\u56e0\u4e3a\u8fc7\u591a\u7684\u4f18\u5148\u7ea7\u89c4\u5219\u4f7f\u5f97\u9605\u8bfb\u58f0\u660e\u5e76\u4e0d\u80fd\u50cf\u81ea\u7136\u65b9\u5f0f\u90a3\u6837\u4ece\u5de6\u81f3\u53f3\u7684\u9605\u8bfb\u3002\u6bd4\u5982\u4e0b\u9762\u8fd9\u4e2a\u58f0\u660e\uff1a<\/p>\n

int (*(*fun)())();<\/strong><\/p>\n

\u5bf9\u4e8e\u8fd9\u4e2a\u58f0\u660e\uff0c\u4f60\u80fd\u51c6\u786e\u8bf4\u51fa\u5b83\u7684\u542b\u4e49\u5417\uff1f\u8fd9\u4e2a\u58f0\u660e\u6d89\u53ca\u5230\u672c\u6587\u7684\u4e24\u5927\u4e3b\u9898\uff1a\u4ec0\u4e48\u662f\u58f0\u660e\u548c\u58f0\u660e\u7684\u9605\u8bfb\u89c4\u5219\u3002\u672c\u6587\u7684\u6700\u540e\u5c06\u7ed9\u51fa\u8fd9\u4e2a\u58f0\u660e\u7684\u51c6\u786e\u542b\u4e49\u3002<\/p>\n

\u58f0\u660e\u548c\u5b9a\u4e49<\/h3>\n

\u5728C\u8bed\u8a00\u4e2d\uff0c\u63d0\u5230\u58f0\u660e\u5c31\u4e0d\u5f97\u4e0d\u63d0\u5230\u5b9a\u4e49\u3002\u8fd9\u91cc\u8bf4\u7684\u58f0\u660e\u65e2\u5305\u542b\u53d8\u91cf\u7684\u58f0\u660e\u53c8\u5305\u542b\u51fd\u6570\u7684\u58f0\u660e\u3002\u5bf9\u4e8e\u51fd\u6570\u7684\u5b9a\u4e49\u548c\u58f0\u660e\u6613\u4e8e\u7406\u89e3\uff0c\u6bd4\u5982\uff1a<\/p>\n

int myfun2();\r\n\r\nint myfun2()\r\n{\r\n\tprintf(\"I am myfun2~\\n\");\r\n\treturn 0;\r\n}<\/pre>\n
\u6240\u8c13\u51fd\u6570\u7684\u5b9a\u4e49\u5c31\u662f\u5bf9\u8be5\u51fd\u6570\u8fdb\u884c\u5177\u4f53\u7684\u529f\u80fd\u5b9e\u73b0\uff0c\u800c\u51fd\u6570\u58f0\u660e\u5219\u662f\u5bf9\u8be5\u51fd\u6570\u8fd4\u56de\u503c\u548c\u53c2\u6570\u7c7b\u578b\u7684\u8bf4\u660e\uff0c\u4f7f\u5f97\u5176\u4ed6\u51fd\u6570\u611f\u77e5\u5230\u8fd9\u4e2a\u51fd\u6570\u7684\u5b58\u5728\uff0c\u4ee5\u4fbf\u5728\u9700\u8981\u65f6\u76f4\u63a5\u8c03\u7528\u8be5\u51fd\u6570\u3002<\/p>\n
\u53d8\u91cf\u7684\u58f0\u660e\u5177\u4f53\u5206\u4e3a\u4e24\u79cd\u60c5\u51b5\uff1a\u5b9a\u4e49\u578b\u58f0\u660e\u548c\u5916\u90e8\u5f15\u7528\u578b\u58f0\u660e\u3002<\/p>\n
\u5b9a\u4e49\u578b\u58f0\u660e\u5176\u5b9e\u5c31\u7b49\u4ef7\u4e8e\u5b9a\u4e49\u3002C\u8bed\u8a00\u7684\u5b9a\u4e49\u662f\u6307\u4e3a\u53d8\u91cf\u5206\u914d\u5185\u5b58\u7a7a\u95f4\uff0c\u5e76\u5728\u9700\u8981\u65f6\u4e3a\u5176\u8d4b\u4e00\u4e2a\u521d\u503c\u3002\u5b9a\u4e49\u578b\u58f0\u660e\u7528\u4e8e\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u53d8\u91cf\uff0c\u5b83\u5728\u5b9a\u4e49\u8fd9\u4e2a\u53d8\u91cf\u7684\u540c\u65f6\u4e5f\u58f0\u660e\u4e86\u8fd9\u4e2a\u53d8\u91cf\u3002\u6bd4\u5982\u4e0b\u8ff0\u4ee3\u7801\u5c31\u58f0\u660e\uff08\u5b9a\u4e49\uff09\u4e86\u4e00\u4e2a\u53d8\u91cfnum\uff0c\u5e76\u5c060\u4f5c\u4e3a\u5176\u521d\u503c\u3002<\/p>\n
int num = 0;<\/pre>\n
\u4f7f\u7528\u5916\u90e8\u5f15\u7528\u578b\u58f0\u660e\u662f\u7531\u4e8e\u8981\u5728\u5f53\u524d\u7a0b\u5e8f\u4e2d\u4f7f\u7528\u5b9a\u4e49\u5728\u5176\u4ed6\u6587\u4ef6\u4e2d\u7684\u53d8\u91cf\u3002\u4e5f\u5c31\u662f\u8bf4\u8fd9\u4e2a\u53d8\u91cf\u662f\u5df2\u5b58\u5728\u7684\uff0c\u56e0\u6b64\u8fd9\u79cd\u58f0\u660e\u5e76\u4e0d\u5305\u542b\u53d8\u91cf\u7684\u5b9a\u4e49\u3002\u6bd4\u5982\uff1a<\/p>\n
file1:\r\nint a = 100;\r\nfile2:\r\nextern int a;<\/pre>\n
C\u8bed\u8a00\u4e2d\u7684\u53d8\u91cf\u53ea\u80fd\u6709\u4e00\u4e2a\u5b9a\u4e49\uff0c\u4f46\u662f\u5b83\u5374\u53ef\u4ee5\u6709\u591a\u4e2aextern\u7684\u58f0\u660e\u3002\u56e0\u4e3aextern\u58f0\u660e\u5e76\u4e0d\u5206\u914d\u5185\u5b58\u7a7a\u95f4\uff0c\u53ea\u662f\u544a\u8bc9\u5f15\u7528\u8fd9\u4e2a\u53d8\u91cf\u7684\u51fd\u6570\uff1a\u8fd9\u4e2a\u53d8\u91cf\u5df2\u7ecf\u5b9a\u4e49\u8fc7\u4e86\uff0c\u4f60\u53ef\u4ee5\u76f4\u63a5\u7684\u4f7f\u7528\u3002<\/p>\n
\u58f0\u660e\u7684\u7ec4\u6210<\/h3>\n
\u58f0\u660e\u786e\u5b9a\u4e86\u53d8\u91cf\u7684\u57fa\u672c\u7c7b\u578b\u548c\u76f8\u5e94\u7684\u521d\u503c\uff08\u5982\u679c\u9700\u8981\u7684\u8bdd\uff09\u3002\u4e00\u4e2a\u5b8c\u6574\u7684\u58f0\u660e\u5305\u62ec\u4e09\u90e8\u5206\uff1a\u4e00\u4e2a\u7c7b\u578b\u8bf4\u660e\u7b26\uff0c\u4e00\u4e2a\u6216\u591a\u4e2a\u58f0\u660e\u5668\uff08declarator\uff09\u548c\u4e00\u4e2a\u5206\u53f7\u3002<\/p>\n
\u7c7b\u578b\u8bf4\u660e\u7b26\u7528\u4e8e\u63cf\u8ff0\u6240\u8981\u58f0\u660e\u53d8\u91cf\u7684\u7c7b\u578b\uff1b\u5206\u53f7\u8bf4\u660e\u4e86\u58f0\u660e\u7684\u7ed3\u675f\uff1b\u58f0\u660e\u5668\u662f\u6807\u793a\u7b26\u4ee5\u53ca\u548c\u5b83\u7ec4\u5408\u5728\u4e00\u8d77\u7684\u6307\u9488\u7b26\u3001\u51fd\u6570\u62ec\u53f7\u548c\u6570\u7ec4\u4e0b\u6807\u7b49\uff0c\u6709\u65f6\u5019\u4e5f\u5c06\u521d\u59cb\u5316\u5185\u5bb9\u653e\u5728\u58f0\u660e\u5668\u4e2d\u3002\u591a\u4e2a\u58f0\u660e\u5668\u7528\u9017\u53f7\u9694\u5f00\u3002\u5173\u4e8e\u58f0\u660e\u548c\u58f0\u660e\u5668\u7684\u5173\u7cfb\u53ef\u53c2\u8003\u4e0b\u56fe\uff1a<\/p>\n
\n
<\/a>\"\"<\/a><\/p>\n
\u8be5\u56fe\u6240\u793a\u7684\u8bed\u53e5\u58f0\u660e\u4e86\u56db\u4e2a\u53d8\u91cf\uff0c\u5176\u57fa\u672c\u7c7b\u578b\u90fd\u662f\u6574\u578b\u3002\u7531\u4e8e\u56db\u4e2a\u53d8\u91cf\u5206\u522b\u5bf9\u5e94\u7740\u4e0d\u540c\u7684\u58f0\u660e\u5668\uff0c\u5219\u6700\u7ec8\u7684\u53d8\u91cf\u7c7b\u578b\u5c31\u6709\u6240\u4e0d\u540c\u3002\u6574\u578b\u53d8\u91cfa\u7684\u58f0\u660e\u5668\u5373\u4e3a\u6807\u793a\u7b26a\uff1b\u7b2c\u4e8c\u4e2a\u58f0\u660e\u5668\u4e3a*b=NULL\uff0c\u5b83\u58f0\u660eb\u662f\u4e00\u4e2a\u6307\u9488\u53d8\u91cf\uff0c\u5176\u521d\u503c\u4e3aNULL\u3002\u7531\u4e8e\u7c7b\u578b\u8bf4\u660e\u7b26\u4e3aint\uff0c\u5219\u8bf4\u660e\u4e86b\u662f\u4e00\u4e2a\u6307\u5411\u6574\u578b\u7684\u6307\u9488\uff1b\u7b2c\u4e09\u4e2a\u58f0\u660e\u5668\u4e3a(*c)[20]\uff0c\u5b83\u58f0\u660ec\u662f\u4e00\u4e2a\u6570\u7ec4\u6307\u9488\uff0c\u8be5\u6307\u9488\u6307\u5411\u62e5\u670920\u4e2a\u5143\u7d20\u7684\u6570\u7ec4\u3002\u7531\u7c7b\u578b\u8bf4\u660e\u7b26\u5f97\u77e5\u8be5\u6570\u7ec4\u7684\u5143\u7d20\u90fd\u662f\u6574\u578b\u7684\uff1b\u6700\u540e\u4e00\u4e2a\u58f0\u660e\u5668\u4e3a*j[20]\uff0c\u5176\u8bf4\u660ej\u662f\u4e00\u4e2a\u6307\u9488\u6570\u7ec4\uff0c\u8be5\u6570\u7ec4\u670920\u4e2a\u5143\u7d20\uff0c\u6bcf\u4e2a\u5143\u7d20\u90fd\u662f\u6307\u5411\u6574\u578b\u53d8\u91cf\u7684\u6307\u9488\u3002<\/p>\n
\u4f18\u5148\u7ea7\u89c4\u5219<\/h3>\n
\u4e86\u89e3\u4e86\u58f0\u660e\u7684\u7ec4\u6210\u540e\uff0c\u5230\u4e86\u8be5\u7ed9\u51fa\u58f0\u660e\u4f18\u5148\u7ea7\u89c4\u5219\u7684\u65f6\u5019\u4e86\u3002C\u8bed\u8a00\u4e2d\u58f0\u660e\u7684\u4f18\u5148\u7ea7\u89c4\u5219\u5982\u4e0b\uff1a<\/p>\n
1.\u58f0\u660e\u4ece\u6700\u5de6\u7684\u6807\u793a\u7b26\u5f00\u59cb\uff0c\u7136\u540e\u6309\u7167\u4e0b\u9762\u7684\u4f18\u5148\u7ea7\u89c4\u5219\u4f9d\u6b21\u8bfb\u53d6\uff1b<\/p>\n
2.\u5177\u4f53\u7684\u4f18\u5148\u7ea7\u4e3a\uff1a<\/p>\n
    \n
  • 2.1 \u88ab\u62ec\u53f7\u62ec\u8d77\u6765\u7684\u90a3\u90e8\u5206\uff1b<\/li>\n
  • 2.2 \u540e\u7f00\u90e8\u5206\uff1b\u5982\u679c\u540e\u7f00\u4e3a( )\uff0c\u8868\u660e\u8fd9\u662f\u4e00\u4e2a\u51fd\u6570\uff1b\u5982\u679c\u540e\u7f00\u4e3a[ ]\uff0c\u8868\u660e\u8fd9\u662f\u4e00\u4e2a\u6570\u7ec4\uff1b<\/li>\n
  • 2.3 \u524d\u7f00\u90e8\u5206\uff1b*\u8868\u793a\u6307\u5411…\u7684\u6307\u9488\uff1b<\/li>\n<\/ul>\n
    3.\u5982\u679cconst\u6216volatile\u5173\u952e\u5b57\u540e\u7d27\u90bb\u57fa\u672c\u7c7b\u578b\u8bf4\u660e\u7b26\uff0c\u5219\u5b83\u4f5c\u7528\u4e8e\u8be5\u7c7b\u578b\u7684\u53d8\u91cf\uff1b\u5426\u5219\uff0cconst\u548cvolatile\u4f5c\u7528\u4e8e\u4ec5\u9760\u5b83\u5de6\u8fb9\u7684\u661f\u53f7\uff0c\u5373\u4f5c\u7528\u4e8e\u6307\u9488\u53d8\u91cf\uff1b<\/p>\n
    \u4e0a\u8ff0\u89c4\u5219\u9700\u8981\u53c2\u8003\u5b9e\u9645\u7684\u58f0\u660e\u6765\u6162\u6162\u7406\u89e3\u3002\u4e0b\u9762\u901a\u8fc7\u4e24\u4e2a\u7b80\u5355\u7684\u58f0\u660e\u4e3e\u4f8b\u6765\u8bf4\u660e\u4e0a\u8ff0\u4f18\u5148\u7ea7\u89c4\u5219\uff1a<\/p>\n
    const int (*p)();\r\nconst int *p();<\/pre>\n
    \u58f0\u660e1\uff1a<\/strong><\/p>\n
      \n
    • \u9996\u5148\u627e\u5230\u6807\u793a\u7b26p\uff0c\u7531\u4e8e\u58f0\u660e1\u4e2d\u7684p\u548c*\u88ab\u5305\u62ec\u8d77\u6765\uff0c\u6839\u636e\u89c4\u52192.1\u5f97\u77e5p\u662f\u4e00\u4e2a\u6307\u9488\u3002\u8be5\u6307\u9488\u6307\u5411\u4ec0\u4e48\u7c7b\u578b\u662f\u63a5\u4e0b\u6765\u8bfb\u58f0\u660e\u7684\u5173\u6ce8\u5bf9\u8c61\uff1b<\/li>\n
    • \u6807\u793a\u7b26\u7684\u540e\u7f00\u90e8\u5206\u662f( )\uff0c\u6839\u636e\u89c4\u52192.2\u5f97\u77e5\u8be5\u6307\u9488\u6307\u5411\u4e00\u4e2a\u51fd\u6570\u3002\u8fd9\u4e2a\u51fd\u6570\u8fd4\u56de\u503c\u662f\u4ec0\u4e48\u7c7b\u578b\u662f\u63a5\u4e0b\u6765\u8bfb\u58f0\u660e\u7684\u5173\u6ce8\u5bf9\u8c61\uff1b<\/li>\n
    • \u8bfb\u5b8c\u4e0a\u8ff0\u58f0\u660e\u7b26\u53f7\u540e\uff0c\u5269\u4e0b\u4e86const int\uff0c\u6839\u636e\u89c4\u52193\u5f97\u77e5\u8fd9\u4e2a\u51fd\u6570\u7684\u8fd4\u56de\u503c\u662f\u4e00\u4e2a\u53ea\u8bfb\u578b\u7684\u6574\u6570\uff1b<\/li>\n<\/ul>\n
      \u7efc\u5408\u4e0a\u9762\u7684\u51e0\u90e8\u5206\u53ef\u5f97\u77e5\u8be5\u58f0\u660e\u7684\u542b\u4e49\uff1ap\u662f\u4e00\u4e2a\u6307\u9488\uff0c\u5b83\u6307\u5411\u4e00\u4e2a\u51fd\u6570\u3002\u8fd9\u4e2a\u51fd\u6570\u6ca1\u6709\u53c2\u6570\uff0c\u8fd4\u56de\u4e00\u4e2a\u53ea\u8bfb\u578b\u7684\u6574\u6570\u3002<\/p>\n
       <\/strong><\/p>\n
      \u58f0\u660e2\uff1a<\/strong><\/p>\n
        \n
      • \u9996\u5148\u627e\u5230\u6807\u793a\u7b26p\uff0c\u5b83\u4e0e*\u6ca1\u6709\u88ab\u5305\u62ec\u5728\u4e00\u8d77\uff0c\u56e0\u6b64\u53ef\u4ee5\u6392\u9664p\u662f\u4e00\u4e2a\u6307\u9488\uff1b<\/li>\n
      • \u7531\u4e8e\u6807\u793a\u7b26\u7684\u540e\u7f00\u90e8\u5206\u662f( )\uff0c\u6839\u636e\u89c4\u52192.2\u5f97\u77e5p\u662f\u4e00\u4e2a\u51fd\u6570\u3002\u8be5\u51fd\u6570\u8fd4\u56de\u4ec0\u4e48\u7c7b\u578b\u662f\u63a5\u4e0b\u6765\u8bfb\u58f0\u660e\u7684\u5173\u6ce8\u5bf9\u8c61\uff1b<\/li>\n
      • \u7531\u4e8ep\u6807\u793a\u7b26\u524d\u6709*\uff0c\u5219\u8bf4\u660e\u8be5\u51fd\u6570\u7684\u8fd4\u56de\u503c\u662f\u4e00\u4e2a\u6307\u9488\u3002\u81f3\u4e8e\u8be5\u6307\u9488\u6307\u5411\u4ec0\u4e48\u6837\u7684\u6570\u636e\u662f\u63a5\u4e0b\u6765\u5bf9\u58f0\u660e\u7684\u5173\u6ce8\u5bf9\u8c61\uff1b<\/li>\n
      • \u901a\u8fc7\u961f\u52193\u53ef\u5f97\u77e5\u8be5\u6307\u9488\u6307\u5411\u4e00\u4e2a\u53ea\u8bfb\u578b\u7684\u6574\u578b\u53d8\u91cf\uff1b<\/li>\n<\/ul>\n
        \u901a\u8fc7\u4e0a\u8ff0\u7684\u5206\u6b65\u5206\u6790\u53ef\u5f97\u77e5\u8be5\u58f0\u660e\u7684\u542b\u4e49\uff1ap\u662f\u4e00\u4e2a\u51fd\u6570\uff0c\u5b83\u6ca1\u6709\u53c2\u6570\uff0c\u8fd4\u56de\u503c\u662f\u4e00\u4e2a\u6307\u9488\u3002\u8be5\u6307\u9488\u6307\u5411\u4e00\u4e2a\u53ea\u8bfb\u578b\u7684\u6574\u578b\u53d8\u91cf\u3002<\/p>\n
        \u901a\u8fc7\u4e0a\u8ff0\u7684\u4f18\u5148\u7ea7\u89c4\u5219\uff0c\u53ef\u4ee5\u8f7b\u677e\u7684\u9605\u8bfb\u4efb\u4f55\u4e00\u4e2a\u58f0\u660e\u3002\u4ece\u4e0a\u8ff0\u4e24\u4e2a\u4e3e\u4f8b\u4e2d\u4e5f\u53ef\u603b\u7ed3\u51fa\u9605\u8bfb\u58f0\u660e\u7684\u5927\u81f4\u65b9\u6cd5\uff0c\u9996\u5148\u5224\u522b\u8be5\u58f0\u660e\u662f\u58f0\u660e\u4e00\u4e2a\u51fd\u6570\u8fd8\u662f\u4e00\u4e2a\u53d8\u91cf\uff1b\u518d\u6839\u636e\u5177\u4f53\u7684\u58f0\u660e\u7c7b\u578b\u5207\u6362\u63a5\u4e0b\u6765\u8bfb\u58f0\u660e\u7684\u5173\u6ce8\u5bf9\u8c61\uff1b\u6700\u540e\u672a\u8bfb\u7684\u57fa\u672c\u7c7b\u578b\u5c31\u662f\u6700\u540e\u4e00\u6b21\u5173\u6ce8\u5bf9\u8c61\u7684\u7c7b\u578b\u3002\u4e0a\u8ff0\u7684\u5927\u81f4\u65b9\u6cd5\u53ef\u8be6\u7ec6\u603b\u7ed3\u5982\u4e0b\uff1a<\/p>\n
          \n
        • 1.\u627e\u5230\u6700\u5de6\u8fb9\u7684\u6807\u793a\u7b26\uff0c\u8868\u793a\u5df2\u88ab\u9605\u8bfb\uff1b<\/li>\n
        • 2.\u82e5\u5df2\u9605\u8bfb\u7b26\u53f7\u53f3\u65b9\u7d27\u90bb[\uff0c\u5219\u4ece\u5de6\u81f3\u53f3\u9605\u8bfb\u5230\u4e0e\u4e4b\u914d\u5bf9\u7684 ] \u4e3a\u6b62\u3002\u8fd9\u4e00\u6bb5\u7b26\u53f7\u8868\u793a \u5f53\u524d\u7684\u5173\u6ce8\u5bf9\u8c61\u662f\u4e00\u4e2a\u6570\u7ec4\uff0c\u8be5\u6570\u7ec4\u7684\u5143\u7d20\u7c7b\u578b\u672a\u77e5\uff1b\u63a5\u4e0b\u6765\u7684\u5173\u6ce8\u5bf9\u8c61\u662f\u6570\u7ec4\u7684\u5143\u7d20\u7684\u7c7b\u578b\uff0c\u8f6c4\uff1b\u5426\u5219\u8f6c\u81f33\uff1b<\/li>\n
        • 3.\u82e5\u5df2\u9605\u8bfb\u7b26\u53f7\u53f3\u65b9\u7d27\u90bb(\uff0c\u5219\u4ece\u5de6\u81f3\u53f3\u9605\u8bfb\u5230\u4e0e\u4e4b\u914d\u5bf9\u7684 )\u4e3a\u6b62\u3002\u8fd9\u4e00\u6bb5\u7b26\u53f7\u8868\u793a\u5f53\u524d\u7684\u5173\u6ce8\u5bf9\u8c61\u662f\u4e00\u4e2a\u51fd\u6570\uff0c\u8be5\u51fd\u6570\u7684\u8fd4\u56de\u503c\u7c7b\u578b\u672a\u77e5\uff1b\u63a5\u4e0b\u6765\u7684\u5173\u6ce8\u5bf9\u8c61\u662f\u51fd\u6570\u7684\u8fd4\u56de\u503c\u7c7b\u578b\uff1b\u987a\u5e8f\u6267\u884c4\uff1b<\/li>\n
        • 4.\u5982\u679c\u5df2\u9605\u8bfb\u7b26\u53f7\u5de6\u8fb9\u7684\u7b26\u53f7\u662f(\uff0c\u5219\u5bfb\u627e\u4e0e\u4e4b\u914d\u5bf9\u7684 )\uff0c\u8fd9\u4e00\u6bb5\u7b26\u53f7\u8868\u793a\u5df2\u7ecf\u9605\u8bfb\u8fc7\uff1b\u8f6c\u81f32\uff1b\u5426\u5219\u8f6c\u81f35\uff1b<\/li>\n
        • 5.\u5982\u679c\u5df2\u9605\u8bfb\u7b26\u53f7\u5de6\u8fb9\u7684\u7b26\u53f7\u662fconst\uff0cvolatile\u548c*\u4e4b\u4e00\uff0c\u5219\u4e0d\u540c\u7b26\u53f7\u4ee3\u8868\u4e0d\u540c\u7684\u542b\u4e49\u3002const\u8868\u793a\u53ea\u8bfb\uff1bvolatile\u8868\u793a\u7981\u6b62\u7f16\u8bd1\u5668\u4f18\u5316\uff1b*\u8868\u793a\u4e00\u4e2a\u6307\u9488\uff0c\u8be5\u6307\u9488\u6307\u5411\u90a3\u79cd\u7c7b\u578b\u662f\u63a5\u4e0b\u6765\u7684\u5173\u6ce8\u5bf9\u8c61\uff0c\u8f6c4\uff1b\u5426\u5219\u8f6c\u81f36\uff1b<\/li>\n
        • 6.\u5269\u4e0b\u7684\u672a\u9605\u8bfb\u7684\u7b26\u53f7\u4e3a\u57fa\u672c\u7684\u6570\u636e\u7c7b\u578b\uff0c\u5373\u4e3a\u5f53\u524d\u5173\u6ce8\u5bf9\u8c61\u7684\u6570\u636e\u7c7b\u578b\uff1b<\/li>\n<\/ul>\n
          \u901a\u8fc7\u4e0a\u8ff0\u65b9\u6cd5\u5373\u53ef\u9605\u8bfb\u4e00\u4e2a\u58f0\u660e\uff0c\u5e76\u7406\u89e3\u5b83\u5177\u4f53\u7684\u542b\u4e49\u3002\u73b0\u5728\u6765\u89e3\u51b3\u672c\u6587\u4e00\u5f00\u59cb\u7684\u90a3\u4e2a\u58f0\u660e\uff1a<\/p>\n
          int (*(*fun)())();<\/strong><\/p>\n
          \u5176\u6b65\u9aa4\u5982\u4e0b\uff1a<\/p>\n
            \n
          • \u627e\u5230\u6807\u793a\u7b26fun\uff0cfun\u5df2\u88ab\u9605\u8bfb\uff1b<\/li>\n
          • \u6b65\u9aa42\uff0c3\uff0c4\u4e0d\u6ee1\u8db3\uff0c\u8f6c\u5230\u6b65\u9aa45\uff1bfun\u7684\u5de6\u65b9\u4e3a*\uff0c\u8bf4\u660efun\u662f\u4e00\u4e2a\u6307\u9488\u3002\u5f53\u524d\u7684\u5173\u6ce8\u5bf9\u8c61\u662ffun\u6307\u5411\u4ec0\u4e48\u7c7b\u578b\u7684\u6570\u636e\uff0c\u8f6c\u5230\u7b2c4\u6b65\uff1b<\/li>\n
          • *fun\u7684\u5de6\u65b9\u4e3a(\uff0c\u5219(*fun)\u8868\u793a\u5df2\u88ab\u9605\u8bfb\u7684\u7b26\u53f7\u3002\u5f53\u524d\u7684\u5173\u6ce8\u5bf9\u8c61\u4ecd\u7136\u662ffun\u6307\u5411\u4ec0\u4e48\u7c7b\u578b\u7684\u6570\u636e\uff0c\u8f6c\u5230\u7b2c2\u6b65\uff1b<\/li>\n
          • (*fun)\u7684\u53f3\u65b9\u7d27\u90bb(\uff0c\u5219(*fun)()\u4e3a\u5df2\u9605\u8bfb\u7684\u7b26\u53f7\u3002\u5b83\u8868\u793afun\u6307\u5411\u4e00\u4e2a\u51fd\u6570\uff0c\u8be5\u51fd\u6570\u7684\u8fd4\u56de\u503c\u7c7b\u578b\u6210\u4e3a\u63a5\u4e0b\u6765\u7684\u5173\u6ce8\u5bf9\u8c61\uff0c\u8f6c\u5230\u7b2c4\u6b65\uff1b<\/li>\n
          • \u6b65\u9aa44\u4e0d\u6ee1\u8db3\uff0c\u8f6c\u5230\u6b65\u9aa45\uff1b(*fun)()\u7684\u5de6\u65b9\u4e3a*\uff0c\u8bf4\u660e\u8fd4\u56de\u503c\u7c7b\u578b\u4e3a\u4e00\u4e2a\u6307\u9488\uff0c\u8be5\u6307\u9488\u6307\u5411\u4ec0\u4e48\u7c7b\u578b\u662f\u63a5\u4e0b\u6765\u7684\u5173\u6ce8\u5bf9\u8c61\u3002\u5f53\u524d\u5df2\u8bfb\u8fc7\u7684\u7b26\u53f7\u8868\u793afun\u662f\u4e00\u4e2a\u6307\u9488\uff0c\u5b83\u6307\u5411\u4e00\u4e2a\u51fd\u6570\uff0c\u8be5\u51fd\u6570\u8fd4\u56de\u4e00\u4e2a\u6307\u9488\uff0c\u8be5\u6307\u9488\u6307\u5411\u4ec0\u4e48\u7c7b\u578b\u672a\u77e5\uff1b\u8f6c\u81f34\uff1b<\/li>\n
          • *(*fun)()\u5de6\u65b9\u4e3a(\uff0c\u5219(*(*fun)())\u8868\u793a\u5df2\u88ab\u9605\u8bfb\u3002\u8f6c\u81f3\u7b2c2\u6b65\uff1b<\/li>\n
          • (*(*fun)())\u7684\u53f3\u65b9\u4e3a(\uff0c\u5219(*(*fun)())()\u4e3a\u5df2\u9605\u8bfb\u7684\u7b26\u53f7\uff0c\u5b83\u8868\u793a\u5f53\u524d\u7684\u5173\u6ce8\u5bf9\u8c61\u662f\u4e00\u4e2a\u51fd\u6570\u3002\u76ee\u524d\u4e3a\u6b62\u5df2\u9605\u8bfb\u7684\u7b26\u53f7\u8868\u793afun\u662f\u4e00\u4e2a\u6307\u9488\uff0c\u5b83\u6307\u5411\u4e00\u4e2a\u51fd\u6570\uff0c\u8be5\u51fd\u6570\u8fd4\u56de\u4e00\u4e2a\u6307\u9488\uff0c\u8be5\u6307\u9488\u6307\u5411\u4e00\u4e2a\u51fd\u6570\uff0c\u8be5\u51fd\u6570\u8fd4\u56de\u503c\u7c7b\u578b\u672a\u77e5\uff1b\u8f6c\u81f34\uff1b<\/li>\n
          • \u6b65\u9aa44\uff0c5\u4e0d\u6ee1\u8db3\u8f6c\u81f36\uff1bint\u8868\u793a\u5f53\u524d\u7684\u5173\u6ce8\u5bf9\u8c61\u4e3a\u6574\u578b\uff0c\u76ee\u524d\u6240\u6709\u7684\u7b26\u53f7\u5df2\u9605\u8bfb\u5b8c\u6bd5\u3002\u6240\u6709\u7684\u58f0\u660e\u7b26\u53f7\u8868\u793afun\u662f\u4e00\u4e2a\u6307\u9488\uff0c\u5b83\u6307\u5411\u4e00\u4e2a\u51fd\u6570\uff0c\u8be5\u51fd\u6570\u8fd4\u56de\u4e00\u4e2a\u6307\u9488\uff0c\u8be5\u6307\u9488\u6307\u5411\u4e00\u4e2a\u51fd\u6570\uff0c\u8be5\u51fd\u6570\u8fd4\u56de\u4e00\u4e2a\u6574\u578b\u53d8\u91cf\uff1b<\/li>\n<\/ul>\n
            \u5927\u529f\u544a\u6210\uff01<\/p>\n
            \u4e0a\u8ff0\u7684\u5206\u6790\u8fc7\u7a0b\u770b\u8d77\u6765\u53ef\u80fd\u6709\u4e9b\u590d\u6742\u548c\u5446\u677f\uff0c\u5f53\u4f60\u719f\u6089\u4e86\u6574\u4e2a\u5206\u6790\u8fc7\u7a0b\u540e\uff0c\u8fd9\u4e2a\u8fc7\u7a0b\u5c31\u53d8\u5f97\u8f7b\u800c\u6613\u4e3e\u3002<\/p>\n
            \u4e3e\u4f8b<\/h3>\n
            \u7ed3\u5408\u4e0a\u9762\u7684\u7406\u8bba\u5206\u6790\uff0c\u53ef\u4ee5\u9605\u8bfb\u4e0b\u9762\u7684\u4ee3\u7801\u3002\u8fd9\u4e2a\u4ee3\u7801\u4e00\u65b9\u9762\u53ef\u4ee5\u5e2e\u52a9\u4f60\u5de9\u56fa\u4e0a\u9762\u7684\u9605\u8bfb\u89c4\u5219\uff0c\u53e6\u4e00\u65b9\u9762\u53ef\u4ee5\u5e2e\u52a9\u4f60\u7406\u89e3\u51fd\u6570\u58f0\u660e\u548c\u6307\u5411\u51fd\u6570\u6307\u9488\u7684\u58f0\u660e\u4e24\u8005\u4e4b\u95f4\u7684\u533a\u522b\u3002<\/p>\n
            \/*\r\n * Author: edsionte\r\n * Email:  edsionte@gmail.com\r\n * Time:   2011\/02\/01\r\n *\/\r\n#include \r\n\r\nint (*myfun1())();\r\nint myfun2();\r\n\r\nint (*myfun1())()\r\n{\r\n\t\/\/myfun1 return a pointer which point a function;\r\n\t\/\/The return function hasn't argument and reurun a int value;\r\n\r\n\tint (*fun2)();\r\n\tprintf(\"I am myfun1~\\n\");\r\n\tfun2 = myfun2;\r\n\treturn fun2;\r\n}\r\n\r\nint myfun2()\r\n{\r\n\tprintf(\"I am myfun2~\\n\");\r\n\treturn 0;\r\n}\r\n\r\nint main()\r\n{\r\n\tint (*(*fun1)())();\r\n\tint (*fun2)();\r\n\r\n\tfun1 = myfun1;\r\n\tfun2 = fun1();\r\n\tfun2();\r\n\r\n\treturn 0;\r\n}<\/pre>\n
            \u53c2\u8003\uff1a<\/p>\n
            \u300aC\u4e13\u5bb6\u7f16\u7a0b\u300b \u4eba\u6c11\u90ae\u7535\u51fa\u7248\u793e\uff1b\uff08\u7f8e\uff09\u6797\u767b\uff08LinDen.P.V.D\uff09 \u8457\uff0c\u5f90\u6ce2 \u8bd1\uff1b<\/p>\n","protected":false},"excerpt":{"rendered":"
            C\u8bed\u8a00\u4e2d\u7684\u53d8\u91cf\u58f0\u660e\u662f\u8ba9\u7a0b\u5e8f\u5458\u6bd4\u8f83\u82e6\u607c\u7684\u4e00\u4ef6\u4e8b\uff0c\u56e0\u4e3a\u8fc7\u591a\u7684\u4f18\u5148\u7ea7\u89c4\u5219\u4f7f\u5f97\u9605\u8bfb\u58f0\u660e\u5e76\u4e0d\u80fd\u50cf\u81ea\u7136\u65b9\u5f0f\u90a3\u6837\u4ece\u5de6\u81f3\u53f3\u7684\u9605 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[74],"tags":[109],"class_list":["post-2350","post","type-post","status-publish","format-standard","hentry","category-c","tag-c"],"views":7640,"_links":{"self":[{"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/posts\/2350","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/comments?post=2350"}],"version-history":[{"count":0,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/posts\/2350\/revisions"}],"wp:attachment":[{"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/media?parent=2350"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/categories?post=2350"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/tags?post=2350"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}