{"id":2393,"date":"2011-01-30T21:56:08","date_gmt":"2011-01-30T13:56:08","guid":{"rendered":"http:\/\/edsionte.com\/techblog\/?p=2393"},"modified":"2011-02-05T20:24:06","modified_gmt":"2011-02-05T12:24:06","slug":"typedef%e9%82%a3%e5%9b%9e%e4%ba%8b%e5%84%bf","status":"publish","type":"post","link":"http:\/\/edsionte.com\/techblog\/archives\/2393","title":{"rendered":"typedef\u90a3\u56de\u4e8b\u513f"},"content":{"rendered":"

typedef\u662f\u4e00\u79cd\u7279\u6b8a\u7684\u58f0\u660e\u65b9\u5f0f\uff0c\u4e0d\u8fc7\u5b83\u4e0e\u666e\u901a\u58f0\u660e\uff08\u8be6\u89c1\u8fd9\u91cc<\/a>\uff09\u7684\u542b\u4e49\u53d6\u5927\u4e0d\u76f8\u540c\u3002\u666e\u901a\u58f0\u660e\u7684\u4e3b\u89d2\u662f\u201c\u53d8\u91cf\u201d\uff0c\u5b83\u6216\u662f\u521b\u5efa\u4e00\u4e2a\u65b0\u53d8\u91cf\u6216\u662f\u5bf9\u5916\u6587\u4ef6\u53d8\u91cf\u4f7f\u7528\u524d\u7684\u58f0\u660e\uff1b\u800ctypedef\u58f0\u660e\u7684\u4e3b\u89d2\u5219\u662f\u201c\u7c7b\u578b\u201d\uff0c\u901a\u8fc7\u8fd9\u4e2a\u58f0\u660e\u5bf9\u4e00\u79cd\u6570\u636e\u7c7b\u578b\u5f15\u5165\u65b0\u7684\u540d\u5b57\u3002\u4ece\u5f15\u5165\u65b0\u540d\u5b57\u8fd9\u4e2a\u89d2\u5ea6\u6765\u8bf4\uff0ctypedef\u58f0\u660e\u53c8\u548c\u5b8f\u5b9a\u4e49\u6709\u4e9b\u76f8\u4f3c\uff1a\u7528\u65b0\u540d\u5b57\u4ee3\u66ff\u5df2\u6709\u7684\u540d\u5b57\u3002\u4e0d\u8fc7\uff0c\u5728\u672c\u6587\u63a5\u4e0b\u6765\u7684\u53d9\u8ff0\u4e2d\u4f60\u4f1a\u770b\u5230\u8fd9\u4e24\u8005\u4e4b\u95f4\u7684\u533a\u522b\u3002<\/p>\n

typedef\u662f\u7279\u6b8a\u7684<\/h3>\n

\u6b63\u5982\u672c\u6587\u4e00\u5f00\u59cb\u6240\u8bf4\u7684\u90a3\u6837\uff0ctypedef\u662f\u7279\u6b8a\u7684\u58f0\u660e\u3002\u6211\u4eec\u6700\u5e38\u89c1\u4ee5\u53ca\u5e38\u7528\u7684\u65b9\u5f0f\u5982\u4e0b\uff1a<\/p>\n

\/* \u4ee3\u7801\u6bb51 *\/\r\nstruct stuinfo\r\n{\r\n\tchar id[20];\r\n\tchar name[20];\r\n\tint age;\r\n};\r\ntypedef struct stuinfo stu; \/* \u8bed\u53e51 *\/<\/pre>\n
\u901a\u8fc7typedef\u58f0\u660e\u4e3astuinfo\u7ed3\u6784\u4f53\u5f15\u5165\u4e86\u4e00\u4e2a\u65b0\u7684\u540d\u5b57stu\u3002\u73b0\u5728stuinfo\u7ed3\u6784\u548cstu\u5c5e\u4e8e\u540c\u4e00\u79cd\u6570\u636e\u7c7b\u578b\uff0c\u53ea\u4e0d\u8fc7\u4e24\u8005\u5728\u58f0\u660e\u4e00\u4e2a\u53d8\u91cf\u65f6\u4f7f\u7528\u7684\u540d\u5b57\u4e0d\u540c\uff1a<\/p>\n
\/* \u4ee3\u7801\u6bb52 *\/\r\nstu mystu1;\r\nstruct stuinfo mystu2; \/* \u8bed\u53e52 *\/<\/pre>\n
\u901a\u8fc7\u4e0a\u8ff0\u4e24\u4e2a\u4ee3\u7801\u6bb5\uff0c\u53ef\u4ee5\u518d\u4e00\u6b21\u7684\u7406\u89e3typedef\u58f0\u660e\u548c\u666e\u901a\u58f0\u660e\u7684\u533a\u522b\u3002\u4ee3\u7801\u6bb51\u901a\u8fc7typedef\u58f0\u660e\u4e3astuinfo\u5f15\u5165\u4e86\u4e00\u4e2a\u65b0\u7684\u540d\u5b57stu\uff1b\u800c\u4ee3\u7801\u6bb52\u5219\u901a\u8fc7\u540c\u4e00\u79cd\u6570\u636e\u7c7b\u578b\u7684\u4e0d\u540c\u540d\u79f0\u5206\u522b\u58f0\u660e\u4e86\u4e24\u4e2a\u540c\u7c7b\u578b\u7684\u53d8\u91cf\u3002\u6ce8\u610f\u5230\u8bed\u53e51\u548c\u8bed\u53e52\uff0c\u9664\u4e86\u8bed\u53e51\u5728\u58f0\u660e\u524d\u591a\u4e86typedef\u5173\u952e\u5b57\u5916\uff0c\u4e24\u8005\u5728\u5f62\u5f0f\u4e0a\u51e0\u4e4e\u4e00\u6837\uff0c\u56e0\u6b64\u90fd\u53ef\u4ee5\u901a\u8fc7\u4e0a\u6587\u6240\u8ff0\u7684\u58f0\u660e\u89c4\u5219\u8fdb\u884c\u9605\u8bfb\u3002\u6b63\u662f\u7531\u4e8etypedef\u8fd9\u4e2a\u5173\u952e\u5b57\uff0c\u4f7f\u5f97\u8fd9\u4e24\u79cd\u58f0\u660e\u7684\u542b\u4e49\u6709\u7740\u5de8\u5927\u5dee\u5f02\u3002<\/p>\n
\u5176\u5b9e\uff0c\u50cf\u4e0a\u9762\u7684\u4e3e\u4f8b\u90a3\u6837\u901a\u8fc7typedef\u58f0\u660e\u800c\u7701\u53bb\u4e00\u4e2astruct\u5e76\u6ca1\u6709\u591a\u5927\u7684\u610f\u4e49\u3002\u4f7f\u7528typedef\u58f0\u660e\u7684\u6700\u5927\u4f18\u70b9\u662f\u53ef\u4ee5\u7b80\u6d01\u7684\u8868\u8fbe\u4e00\u4e2a\u6307\u9488\u3002\u6bd4\u5982ANSI C\u4e2d\u7684signal()\uff0c\u5b83\u7684\u5b9a\u4e49\u5982\u4e0b\uff1a<\/p>\n
void ( *signal(int signum, void (*handler)(int)) ) (int);<\/pre>\n
\u8003\u9a8c\u4f60\u7684\u65f6\u523b\u5230\u4e86\uff01\u4f60\u662f\u5426\u80fd\u5feb\u901f\u8bf4\u51fa\u8fd9\u4e2a\u58f0\u660e\u7684\u542b\u4e49\uff1f<\/p>\n
\u8fd9\u4e2a\u590d\u6742\u7684\u8bed\u53e5\u58f0\u660e\u4e86signal\u51fd\u6570\uff0c\u8fd9\u4e2a\u51fd\u6570\u6709\u4e24\u4e2a\u53c2\u6570signum\u548chandler\uff1bsignum\u53c2\u6570\u662f\u4e00\u4e2a\u6574\u578b\u53d8\u91cf\u3002handler\u662f\u4e00\u4e2a\u51fd\u6570\u6307\u9488\uff0c\u6307\u5411\u4e00\u4e2a\u62e5\u6709\u6574\u578b\u53c2\u6570\u5e76\u4e14\u8fd4\u56de\u7a7a\u503c\u7684\u51fd\u6570\uff1bsignal\u51fd\u6570\u7684\u8fd4\u56de\u503c\u662f\u4e00\u4e2a\u51fd\u6570\u6307\u9488\uff0c\u8be5\u6307\u9488\u540c\u6837\u6307\u5411\u4e00\u4e2a\u62e5\u6709\u6574\u578b\u53c2\u6570\u5e76\u4e14\u8fd4\u56de\u7a7a\u503c\u7684\u51fd\u6570\u3002<\/p>\n
\u5bf9\u4e8e\u8fd9\u4e2a\u590d\u6742\u58f0\u660e\u7684\u89e3\u8bfb\u7684\u786e\u5f88\u4ee4\u4eba\u8d39\u52b2\u3002\u4f46\u662f\u7ecf\u8fc7typedef\u7684\u6539\u8fdb\uff0c\u5b83\u7684\u9605\u8bfb\u8fc7\u7a0b\u5c31\u7b80\u5316\u4e86\u5f88\u591a\uff1a<\/p>\n
 typedef void (*sighandler_t)(int);\r\n sighandler_t signal(int signum, sighandler_t handler);<\/pre>\n
\u901a\u8fc7typedef\u7684\u58f0\u660e\uff0c\u4f7f\u5f97sighandler_t\u662f\u8fd9\u6837\u4e00\u79cd\u7c7b\u578b\uff1a\u5b83\u662f\u4e00\u4e2a\u51fd\u6570\u6307\u9488\uff0c\u8be5\u51fd\u6570\u62e5\u6709\u4e00\u4e2a\u6574\u578b\u53c2\u6570\u5e76\u4e14\u8fd4\u56de\u7a7a\u503c\u3002\u7b2c\u4e8c\u6761\u8bed\u53e5\u5219\u58f0\u660e\u4e86\u51fd\u6570signal\uff0c\u5b83\u62e5\u6709\u4e24\u4e2a\u53c2\u6570signum\u548chandler\u3002\u5e76\u4e14\u8fd9\u4e2a\u51fd\u6570\u7684\u8fd4\u56de\u503c\u548c\u53c2\u6570handler\u90fd\u662fsighandler_t\u7c7b\u578b\u7684\u3002<\/p>\n
\u867d\u7136\u8fd9\u6837\u7684\u58f0\u660e\u5728\u5f62\u5f0f\u4e0a\u7b80\u6d01\u8bb8\u591a\uff0c\u4e0d\u8fc7\u548c\u666e\u901a\u58f0\u660e\u4e00\u6837\uff0c\u6b64\u65f6\u9605\u8bfb\u58f0\u660e\u65f6\u4ecd\u7136\u8981\u8bb0\u4f4f\u58f0\u660e\u7b26\u53f7\u7684\u4f18\u5148\u7ea7\u89c4\u5219\u3002\u8fd9\u79cd\u56f0\u6270\u5728C\u8bed\u8a00\u4e2d\u662f\u96be\u4ee5\u907f\u514d\u7684\u3002<\/p>\n
typedef int x\u548c#define x int\u662f\u4e0d\u4e00\u6837\u7684<\/h3>\n
typedef\u548c\u5b8f\u5b9a\u4e49\u770b\u4f3c\u90fd\u662f\u6587\u672c\u66ff\u6362\uff0c\u4f46\u5176\u5b9e\u8d28\u4e0d\u540c\u3002typedef\u8868\u9762\u4e0a\u662f\u5bf9\u5df2\u6709\u6570\u636e\u7c7b\u578b\u5f15\u5165\u65b0\u540d\u79f0\uff0c\u5b9e\u5219\u662f\u5bf9\u6570\u636e\u7c7b\u578b\u7684\u4e25\u683c\u5c01\u88c5\u3002\u8fd9\u79cd\u5c01\u88c5\u4f53\u73b0\u5728\u4e0b\u8ff0\u4e24\u4e2a\u65b9\u9762\u3002<\/p>\n
\u9996\u5148\uff0c\u7ecf\u8fc7\u5b8f\u5b9a\u4e49\u540e\u7684\u7c7b\u578b\u540d\u53ef\u4ee5\u8fdb\u884c\u518d\u6b21\u6269\u5c55\uff0c\u4f46\u662f\u7ecf\u8fc7typedef\u5f15\u5165\u7684\u7c7b\u578b\u540d\u5219\u4e0d\u80fd\u8fdb\u884c\u6269\u5145\u3002\u6bd4\u5982\uff1a<\/p>\n
#define myint1 int\r\nunsigned myint1 x; \/* \u6b63\u786e *\/\r\n\r\ntypedef int myint2;\r\nunsigned myint2 x; \/* \u8bed\u6cd5\u9519\u8bef\uff01 *\/<\/pre>\n
\u7531\u4e8etypedef\u662f\u4e00\u79cd\u4e25\u683c\u7684\u6570\u636e\u5c01\u88c5\uff0c\u5b83\u53ea\u5f15\u5165\u4e86myint2\u7c7b\u578b\u800c\u6ca1\u6709\u5f15\u5165unsigned myint2\u7c7b\u578b\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c\u901a\u8fc7typedef\u7684\u58f0\u660e\uff0c\u7f16\u8bd1\u5668\u53ea\u80fd\u8bc6\u522bmyint2\u7c7b\u578b\u3002\u800cunsigned myint2\u65e2\u4e0d\u662f\u57fa\u672c\u7c7b\u578b\u4e5f\u4e0d\u662f\u7ecf\u8fc7typedef\u58f0\u660e\u8fc7\u7684\u7c7b\u578b\uff0c\u7f16\u8bd1\u5668\u5c31\u65e0\u6cd5\u8bc6\u522b\u3002<\/p>\n
\u5176\u6b21\uff0c\u5728\u8fde\u7eed\u7684\u51e0\u4e2a\u53d8\u91cf\u58f0\u660e\u4e2d\uff0c\u4f7f\u7528typedef\u5b9a\u4e49\u7684\u7c7b\u578b\u80fd\u591f\u4fdd\u8bc1\u6240\u6709\u53d8\u91cf\u5747\u4e3a\u76f8\u540c\u7c7b\u578b\uff0c\u800c\u7528\u5b8f\u5b9a\u4e49\u7684\u53d8\u91cf\u5219\u65e0\u6cd5\u4fdd\u8bc1\u7edf\u4e00\u6027\u3002\u6bd4\u5982\uff1a<\/p>\n
#define myint1 int *\r\nmyint1 x,y; \/* \u7ecf\u8fc7\u5b8f\u66ff\u6362\u540e\u4e3a: int *x,y; *\/\r\n\r\ntypedef int * myint2;\r\nmyint2 x,y;<\/pre>\n
\u7531\u4e8e\u5b8f\u5b9a\u4e49\u53ea\u662f\u76f4\u63a5\u7684\u6587\u672c\u66ff\u6362\uff0c\u56e0\u6b64\u53ea\u80fd\u4fdd\u8bc1x\u662f\u6574\u578b\u7684\u6307\u9488\u53d8\u91cf\u800cy\u4e3a\u6574\u578b\u53d8\u91cf\u3002\u800ctypedef\u5b9a\u4e49\u8fc7\u7684\u7c7b\u578bmyint2\u5219\u662f\u5bf9int *\u7684\u5b8c\u5168\u5c01\u88c5\uff0c\u6240\u4ee5x\u548cy\u5747\u4e3a\u6574\u578b\u7684\u6307\u9488\u53d8\u91cf\u3002<\/p>\n
C\u8bed\u8a00\u4e2d\u7684\u540d\u5b57\u7a7a\u95f4<\/h3>\n
\u5728\u8bf4\u660e\u540d\u5b57\u7a7a\u95f4\u4e4b\u524d\uff0c\u8bf7\u5148\u9605\u8bfb\u4e0b\u9762\u7684\u4ee3\u7801\uff1a<\/p>\n
\/*\r\n *Author: edsionte\r\n *Email:  edsionte@gmail.com\r\n *Time:   2011\/02\/03\r\n *\/\r\n\r\n#include < stdio.h >\r\n#include < string.h >\r\n\r\nstruct id\r\n{\r\n\tint id;\r\n}id;\r\n\r\ntypedef struct name\r\n{\r\n\tchar name[20];\r\n}name;\r\n\r\nstruct name name1;\r\nname name2;\r\n\r\nint main()\r\n{\r\n\tid.id = 1;\r\n\tstrcpy(name1.name,\"hello,\");\r\n\tstrcpy(name2.name,\"edsionte!\");\r\n\tprintf(\"id.id = %d, %s%s\\n\",id.id,name1.name,name2.name);\r\n\treturn 0;\r\n}\r\n\/* \u8fd0\u884c\u7ed3\u679c *\/\r\nedsionte@edsionte-laptop:~\/code\/expertC$ gcc tpdef.c -o tpdef\r\nedsionte@edsionte-laptop:~\/code\/expertC$ .\/tpdef\r\nid.id = 1, hello,edsionte!<\/pre>\n
\u4f60\u53ef\u80fd\u5df2\u7ecf\u53d1\u73b0\u5728\u4e0a\u8ff0\u4ee3\u7801\u4e2d\u51fa\u73b0\u4e86\u591a\u4e2aid\u548cname\uff0c\u5e76\u4e14\u8fd9\u6837\u7684\u4ee3\u7801\u53ef\u4ee5\u6210\u529f\u7684\u7f16\u8bd1\u3002\u8fd9\u4e9b\u76f8\u540c\u7684\u540d\u5b57\u6807\u7b7e\u4e3a\u4f55\u53ef\u4ee5\u540c\u65f6\u51fa\u73b0\uff1f\u6bcf\u4e2a\u6807\u7b7e\u4ee3\u8868\u4ec0\u4e48\u542b\u4e49\uff1f\u8fd9\u4e9b\u95ee\u9898\u5c06\u662f\u4e0b\u9762\u5206\u6790\u7684\u91cd\u70b9\u3002<\/p>\n
\u4ee5\u4e0a\u8ff0\u4ee3\u7801\u4e2d10\u523013\u884c\u7684\u4ee3\u7801\u4e3a\u4f8b\uff0c\u8fd9\u6761\u8bed\u53e5\u4e2d\u5305\u542b\u4e09\u4e2aid\u6807\u7b7e\u3002\u5b83\u4eec\u5206\u522b\u5bf9\u5e94C\u8bed\u8a00\u4e2d\u4e09\u79cd\u5e38\u89c1\u7684\u540d\u5b57\u7a7a\u95f4\uff1a<\/p>\n
    \n
  • \u7ed3\u6784\u6807\u7b7e\uff1a\u8fd9\u79cd\u6807\u7b7e\u7528\u4e8e\u7ed3\u6784\u4f53\u3001\u8054\u5408\u4f53\u548c\u679a\u4e3e\u7c7b\u578b\uff1bstruct\u540e\u7684id\u5373\u4e3a\u6b64\u7c7b\u578b\u7684\u540d\u5b57\u7a7a\u95f4\uff1b<\/li>\n
  • \u6210\u5458\u540d\uff1a\u6bcf\u4e2a\u7ed3\u6784\u4f53\u6216\u8054\u5408\u4f53\u5185\u90e8\u90fd\u4e0e\u5c5e\u4e8e\u81ea\u5df1\u7684\u540d\u5b57\u7a7a\u95f4\uff1bstruct\u5185\u90e8\u7684\u6210\u5458id\u5373\u4e3a\u6b64\u7c7b\u578b\uff1b<\/li>\n
  • \u6807\u7b7e\u540d\uff1a\u58f0\u660e\u4e2d\u7684\u6807\u793a\u7b26\uff1b\u6bd4\u5982\u6700\u540e\u4e00\u4e2aid\uff0c\u4ed6\u662fstruct id\u7c7b\u578b\u7684\u53d8\u91cf\uff1b<\/li>\n<\/ul>\n
    \u7531\u4e8e\u8fd9\u4e09\u79cd\u6807\u7b7e\u6240\u5904\u7684\u540d\u5b57\u7a7a\u95f4\u4e0d\u540c\uff0c\u56e0\u6b64\u5b83\u4eec\u53ef\u4ee5\u540c\u65f6\u5b58\u5728\u3002\u4f46\u662f\u5728\u540c\u4e00\u4e2a\u540d\u5b57\u7a7a\u95f4\u4e2d\u4e0d\u80fd\u51fa\u73b0\u591a\u4e2a\u540c\u540d\u7684\u6807\u7b7e\u3002\u5e38\u89c1\u7684\u4f8b\u5b50\u5c31\u662f\u4e00\u4e2a\u7ed3\u6784\u4f53\u5185\u4e0d\u53ef\u80fd\u51fa\u73b0\u540c\u540d\u7684\u53d8\u91cf\u3002<\/p>\n
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