{"id":456,"date":"2024-02-28T13:05:11","date_gmt":"2023-12-16T01:14:06","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/index.php\/2023\/11\/30\/c%e4%b8%ad%e7%9a%84foreach%e5%be%aa%e7%8e%af\/"},"modified":"2025-08-02T11:01:57","modified_gmt":"2025-08-02T03:01:57","slug":"c%e4%b8%ad%e7%9a%84foreach%e5%be%aa%e7%8e%af","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/c%e4%b8%ad%e7%9a%84foreach%e5%be%aa%e7%8e%af\/","title":{"rendered":"C++ foreach\u5faa\u73af\u5b8c\u5168\u6307\u5357\uff1a\u8bed\u6cd5\u3001\u7528\u6cd5\u4e0e\u6700\u4f73\u5b9e\u8df5"},"content":{"rendered":"

\u4ecb\u7ecd<\/h2>\n

C++\u4e2d\u7684foreach\u5faa\u73af\uff0c\u66f4\u5177\u4f53\u5730\u8bf4\uff0c\u662frange-based for\u5faa\u73af\uff0c\u662f\u5728C++11\u4e2d\u5f15\u5165\u7684\u3002\u8fd9\u79cdfor\u5faa\u73af\u7ed3\u6784\u7b80\u5316\u4e86\u5bf9\u53ef\u8fed\u4ee3\u6570\u636e\u96c6\u7684\u904d\u5386\u3002\u5b83\u901a\u8fc7\u6d88\u9664\u521d\u59cb\u5316\u8fc7\u7a0b\uff0c\u5e76\u904d\u5386\u6bcf\u4e00\u4e2a\u5143\u7d20\u800c\u4e0d\u662f\u8fed\u4ee3\u5668\u6765\u5b9e\u73b0\u8fd9\u4e00\u70b9\u3002\u56e0\u6b64\uff0c\u8ba9\u6211\u4eec\u6df1\u5165\u4e86\u89e3\u76f8\u5e94\u7684foreach\u5faa\u73af\u7ed3\u6784\u3002<\/p>\n

C++\u4e2dforeach\u5faa\u73af\u7684\u5de5\u4f5c\u539f\u7406<\/h2>\n

\u57fa\u672c\u4e0a\uff0cfor-each\u5faa\u73af\u5728\u6570\u7ec4\u3001\u5411\u91cf\u6216\u4efb\u4f55\u5176\u4ed6\u6570\u636e\u96c6\u4e0a\u8fed\u4ee3\u3002\u5b83\u5c06\u5f53\u524d\u5143\u7d20\u7684\u503c\u8d4b\u7ed9\u5faa\u73af\u5185\u58f0\u660e\u7684\u8fed\u4ee3\u5668\u53d8\u91cf\u3002\u8ba9\u6211\u4eec\u4ed4\u7ec6\u770b\u4e00\u4e0b\u8bed\u6cd5\uff1a<\/p>\n

for<\/span>(<\/span>type variable_name :<\/span> array\/<\/span>vector_name)<\/span>\r\n{<\/span>\r\n    loop statements\r\n    .<\/span>.<\/span>.<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u4ece\u6211\u4eec\u53ef\u4ee5\u770b\u5230\u7684:<\/p>\n
    \n
  • \u5728\u5faa\u73af\u521d\u59cb\u5316\u671f\u95f4\uff0c\u5143\u7d20\u53d8\u91cf\u58f0\u660e\u662f\u6211\u4eec\u9700\u8981\u58f0\u660e\u5c06\u5728\u6570\u7ec4\u6216\u5411\u91cf\u4e0a\u8fed\u4ee3\u7684\u53d8\u91cf\u7684\u90e8\u5206\u3002\u8fd9\u91cc\uff0ctype\u662fvariable_name\u7684\u6570\u636e\u7c7b\u578b\u3002<\/li>\n
  • array\/vector name\u662f\u5faa\u73af\u5c06\u8fed\u4ee3\u7684\u76f8\u5e94\u6570\u636e\u96c6\u7684\u540d\u79f0\u3002<\/li>\n
  • loop statements\u662f\u7528\u6237\u53ef\u4ee5\u9009\u62e9\u4f7f\u7528\u8fed\u4ee3\u53d8\u91cf\u5bf9\u76f8\u5e94\u5143\u7d20\u6267\u884c\u7684\u4e0d\u540c\u64cd\u4f5c\u3002<\/li>\n<\/ul>\n
    \u6ce8\u610f\uff1a\u5efa\u8bae\u53d8\u91cf\u7684\u6570\u636e\u7c7b\u578b\u4e0e\u6570\u7ec4\u6216\u5411\u91cf\u7684\u6570\u636e\u7c7b\u578b\u4fdd\u6301\u4e00\u81f4\u3002\u5982\u679c\u6570\u636e\u7c7b\u578b\u4e0d\u4e00\u81f4\uff0c\u5219\u5143\u7d20\u5c06\u88ab\u8fdb\u884c\u7c7b\u578b\u8f6c\u6362\u540e\u5b58\u50a8\u5230\u53d8\u91cf\u4e2d\u3002<\/p>\n
    foreach\u5faa\u73af\u7684\u793a\u4f8b<\/h2>\n
    C++\u4e2d\u4f7f\u7528foreach\u5faa\u73af\u8fed\u4ee3\u6570\u7ec4\u7684\u793a\u4f8b<\/h3>\n
    \u4e0b\u9762\u7ed9\u51fa\u7684\u4ee3\u7801\u6f14\u793a\u4e86C++\u4e2d\u4f7f\u7528for-each\u5faa\u73af\u7684\u7528\u6cd5\u3002<\/p>\n
    #<\/span>include<\/span><iostream><\/span><\/span>\r\nusing<\/span> namespace<\/span> std;<\/span> \r\nint<\/span> main<\/span>(<\/span>)<\/span> \r\n{<\/span> \r\n    int<\/span> arr[<\/span>]<\/span>=<\/span>{<\/span>1<\/span>,<\/span>2<\/span>,<\/span>3<\/span>,<\/span>4<\/span>,<\/span>5<\/span>}<\/span>;<\/span>   \/\/\u6570\u7ec4\u521d\u59cb\u5316<\/span>\r\n    cout<<<\/span>\"\u5143\u7d20\u4e3a: \"<\/span>;<\/span>\r\n    for<\/span>(<\/span>int<\/span> i :<\/span> arr)<\/span>\r\n    {<\/span>\r\n    \tcout<<<\/span>i<<<\/span>\" \"<\/span>;<\/span>\r\n    }<\/span>\r\n    return<\/span> 0<\/span>;<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
    \u8f93\u51fa\u7ed3\u679c\uff1a<\/p>\n
    \u5143\u7d20\u4e3a:<\/span> 1<\/span> 2<\/span> 3<\/span> 4<\/span> 5<\/span>\r\n<\/code><\/pre>\n
    \u8ba9\u6211\u4eec\u6765\u5206\u89e3\u8fd9\u6bb5\u4ee3\u7801\uff0c\u9010\u884c\u67e5\u770b\u5b83\uff1a<\/p>\n
      \n
    • \u6570\u7ec4arr[]\u88ab\u521d\u59cb\u5316\u4e3a\u4e00\u4e9b\u503c{1, 2, 3, 4, 5}<\/li>\n
    • \u5728\u5faa\u73af\u7ed3\u6784\u5185\u90e8\uff0c’i’\u662f\u5b58\u50a8\u5f53\u524d\u6570\u7ec4\u5143\u7d20\u503c\u7684\u53d8\u91cf<\/li>\n
    • arr\u662f\u6570\u7ec4\u540d\uff0c\u540c\u65f6\u4e5f\u4f5c\u4e3a\u76f8\u5e94\u6570\u7ec4\u7684\u57fa\u5730\u5740<\/li>\n
    • \u6b63\u5982\u6211\u4eec\u6240\u770b\u5230\u7684\uff0c\u6bcf\u6b21\u8fed\u4ee3\u6253\u5370’i’\u4f1a\u7ed9\u6211\u4eec\u76f8\u5e94\u7684\u6570\u7ec4\u5143\u7d20\uff0c\u800c\u5728\u666e\u901afor\u5faa\u73af\u4e2d\u5219\u662f\u6570\u7ec4\u7d22\u5f15<\/li>\n<\/ul>\n
      \u8bf7\u6ce8\u610f\uff1a\u5728\u58f0\u660e\u53d8\u91cf’i’\u65f6\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528auto\u6570\u636e\u7c7b\u578b\u6765\u4ee3\u66ffint\u3002\u8fd9\u6837\u53ef\u4ee5\u786e\u4fdd\u53d8\u91cf\u7684\u7c7b\u578b\u7531\u6570\u7ec4\u7c7b\u578b\u63a8\u65ad\u51fa\u6765\uff0c\u907f\u514d\u51fa\u73b0\u6570\u636e\u7c7b\u578b\u51b2\u7a81\u3002<\/p>\n
      \u4f8b\u5982\uff1a<\/p>\n
      \u8fd9\u662f\u6587\u7ae0\u300aC++\u4e2d\u7684foreach\u5faa\u73af\u300b\u7684\u7b2c2\u90e8\u5206\uff08\u51713\u90e8\u5206\uff09\u3002<\/p>\n
      #<\/span>include<\/span><iostream><\/span><\/span>\r\nusing<\/span> namespace<\/span> std;<\/span> \r\nint<\/span> main<\/span>(<\/span>)<\/span> \r\n{<\/span> \r\n    int<\/span> array[<\/span>]<\/span>=<\/span>{<\/span>1<\/span>,<\/span>4<\/span>,<\/span>7<\/span>,<\/span>4<\/span>,<\/span>8<\/span>,<\/span>4<\/span>}<\/span>;<\/span>\r\n    cout<<<\/span>\"\u6570\u7ec4\u5143\u7d20\u4e3a\uff1a\"<\/span>;<\/span>\r\n    for<\/span>(<\/span>auto<\/span> var :<\/span> array)<\/span>\r\n    {<\/span>\r\n    \tcout<<<\/span>var<<<\/span>\" \"<\/span>;<\/span>\r\n    }<\/span>\r\n    return<\/span> 0<\/span>;<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
      \u8f93\u51fa\uff1a<\/p>\n
      \"\u4f7f\u7528Auto\u5173\u952e\u5b57\u7684Foreach\u5faa\u73af\"<\/div>\n
      \u4ee5\u4e0b\u5185\u5bb9\u9700\u8981\u7ffb\u8bd1\u4e3a\u4e2d\u6587\uff1a<\/p>\n
      \"\u4f7f\u7528Auto\u5173\u952e\u5b57\u7684Foreach\u5faa\u73af\"<\/div>\n
      \u5728C++\u4e2d\uff0c\u5411\u91cf\u7684foreach\u5faa\u73af\u793a\u4f8b\u662f\u4ec0\u4e48\uff1f<\/h3>\n
      \u4ee5\u4e0b\u4ee3\u7801\u5c55\u793a\u4e86\u4f7f\u7528for-each\u5faa\u73af\u8fed\u4ee3\u5411\u91cf\u7684\u7528\u6cd5\uff1a<\/p>\n
      #<\/span>include<\/span><iostream><\/span><\/span>\r\n#<\/span>include<\/span><vector><\/span><\/span>\r\nusing<\/span> namespace<\/span> std;<\/span> \r\nint<\/span> main<\/span>(<\/span>)<\/span> \r\n{<\/span> \r\n    vector<<\/span>int<\/span>><\/span> vec=<\/span>{<\/span>11<\/span>,<\/span>22<\/span>,<\/span>33<\/span>,<\/span>44<\/span>,<\/span>55<\/span>,<\/span>66<\/span>}<\/span>;<\/span>\r\n    cout<<<\/span>\"\u5411\u91cf\u5143\u7d20\u4e3a\uff1a\"<\/span>;<\/span>\r\n    for<\/span>(<\/span>auto<\/span> var :<\/span> vec)<\/span>\r\n    {<\/span>\r\n    \tcout<<<\/span>var<<<\/span>\" \"<\/span>;<\/span>\r\n\t}<\/span>\r\n    return<\/span> 0<\/span>;<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
      \u8f93\u51fa\uff1a<\/p>\n
      \"\u5411\u91cf\u7684Foreach\u5faa\u73af\"<\/div>\n
      \u7531\u4e8e\u9650\u5236\u6761\u4ef6\u4ee5\u53ca\u6280\u672f\u95ee\u9898\uff0c\u65e0\u6cd5\u63d0\u4f9b\u591a\u4e2a\u9009\u9879\u3002<\/p>\n
      \u5bf9\u4e8e\u5411\u91cf\uff0cfor-each\u5faa\u73af\u7684\u5de5\u4f5c\u65b9\u5f0f\u4e0e\u6570\u7ec4\u76f8\u540c\u3002\u6b64\u5916\uff0c\u552f\u4e00\u7684\u533a\u522b\u5728\u4e8e\u5411\u91cf\u7684\u58f0\u660e\u3001\u521d\u59cb\u5316\u548c\u53ef\u4ee5\u6267\u884c\u7684\u4e0d\u540c\u64cd\u4f5c\u3002<\/p>\n
      C++\u4e2dforeach\u5faa\u73af\u7684\u4f18\u7f3a\u70b9<\/h2>\n
      1. foreach\u5faa\u73af\u7684\u4f18\u70b9<\/h3>\n
        \n
      • \u5b83\u6d88\u9664\u4e86\u51fa\u9519\u7684\u53ef\u80fd\u6027\uff0c\u4f7f\u4ee3\u7801\u66f4\u52a0\u6613\u8bfb\u3002<\/li>\n
      • \u6613\u4e8e\u5b9e\u73b0<\/li>\n
      • \u4e0d\u9700\u8981\u9884\u5148\u521d\u59cb\u5316\u8fed\u4ee3\u5668<\/li>\n<\/ul>\n
        2. foreach\u5faa\u73af\u7684\u7f3a\u70b9<\/h3>\n
          \n
        • \u65e0\u6cd5\u76f4\u63a5\u8bbf\u95ee\u76f8\u5e94\u5143\u7d20\u7684\u7d22\u5f15<\/li>\n
        • \u65e0\u6cd5\u4ee5\u76f8\u53cd\u987a\u5e8f\u904d\u5386\u5143\u7d20<\/li>\n
        • \u5b83\u4e0d\u5141\u8bb8\u7528\u6237\u8df3\u8fc7\u4efb\u4f55\u5143\u7d20\uff0c\u56e0\u4e3a\u5b83\u4f1a\u904d\u5386\u6bcf\u4e00\u4e2a\u5143\u7d20<\/li>\n<\/ul>\n
          \u7ed3\u8bba<\/h2>\n
          C++\u4e2d\u7684foreach\u5faa\u73af\u6709\u5176\u81ea\u5df1\u7684\u4f18\u70b9\u548c\u7f3a\u70b9\u3002\u4ee3\u7801\u6613\u4e8e\u9605\u8bfb\uff0c\u4f46\u5b83\u9650\u5236\u4e86\u4e00\u4e9b\u6b63\u5e38for\u5faa\u73af\u63d0\u4f9b\u7684\u64cd\u4f5c\u3002\u56e0\u6b64\uff0c\u5b83\u5b8c\u5168\u53d6\u51b3\u4e8e\u7528\u6237\u5e0c\u671b\u5faa\u73af\u6267\u884c\u4ec0\u4e48\u64cd\u4f5c\uff0c\u7136\u540e\u6839\u636e\u9700\u6c42\u8fdb\u884c\u9009\u62e9\u3002<\/p>\n
          \u53c2\u8003\u8d44\u6599<\/h2>\n
            \n
          • https:\/\/stackoverflow.com\/questions\/16504062\/how-to-make-the-for-each-loop-function-in-c-work-with-a-custom-class<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"
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