{"id":215,"date":"2012-10-27T08:02:00","date_gmt":"2012-10-27T00:02:00","guid":{"rendered":"http:\/\/nike0good.jp1.rpvhost.net\/120"},"modified":"2012-10-27T08:02:00","modified_gmt":"2012-10-27T00:02:00","slug":"operator_overloading","status":"publish","type":"post","link":"https:\/\/nike0good.com\/?p=215","title":{"rendered":"\u8fd0\u7b97\u7b26\u91cd\u8f7d"},"content":{"rendered":"

\n\u4ec0\u4e48\u662f\u8fd0\u7b97\u7b26\u7684\u91cd\u8f7d?<\/p>\n

\n         \u8fd0\u7b97\u7b26\u4e0e\u7c7b\u7ed3\u5408\uff0c\u4ea7\u751f\u65b0\u7684\u542b\u4e49\u3002 <\/p>\n

\n\u4e3a\u4ec0\u4e48\u8981\u5f15\u5165\u8fd0\u7b97\u7b26\u91cd\u8f7d\uff1f<\/p>\n

\n         \u4f5c\u7528\uff1a\u4e3a\u4e86\u5b9e\u73b0\u7c7b\u7684\u591a\u6001\u6027(\u591a\u6001\u662f\u6307\u4e00\u4e2a\u51fd\u6570\u540d\u6709\u591a\u79cd\u542b\u4e49)<\/p>\n

\n\u600e\u4e48\u5b9e\u73b0\u8fd0\u7b97\u7b26\u7684\u91cd\u8f7d\uff1f<\/p>\n

\n\u65b9\u5f0f\uff1a\u7c7b\u7684\u6210\u5458\u51fd\u6570 \u6216 \u53cb\u5143\u51fd\u6570\uff08\u7c7b\u5916\u7684\u666e\u901a\u51fd\u6570\uff09<\/p>\n

\n\u89c4\u5219\uff1a\u4e0d\u80fd\u91cd\u8f7d\u7684\u8fd0\u7b97\u7b26\u6709 .  \u548c .* \u548c ?: \u548c ::  \u548c sizeof<\/p>\n

\n\u53cb\u5143\u51fd\u6570\u548c\u6210\u5458\u51fd\u6570\u7684\u4f7f\u7528\u573a\u5408\uff1a\u4e00\u822c\u60c5\u51b5\u4e0b\uff0c\u5efa\u8bae\u4e00\u5143\u8fd0\u7b97\u7b26\u4f7f\u7528\u6210\u5458\u51fd\u6570\uff0c\u4e8c\u5143\u8fd0\u7b97\u7b26\u4f7f\u7528\u53cb\u5143\u51fd\u6570<\/p>\n

\n        1\u3001\u8fd0\u7b97\u7b26\u7684\u64cd\u4f5c\u9700\u8981\u4fee\u6539\u7c7b\u5bf9\u8c61\u7684\u72b6\u6001\uff0c\u5219\u4f7f\u7528\u6210\u5458\u51fd\u6570\u3002\u5982\u9700\u8981\u505a\u5de6值\u64cd\u4f5c\u6570\u7684\u8fd0\u7b97\u7b26\uff08\u5982=\uff0c+=\uff0c++\uff09<\/p>\n

\n        2\u3001\u8fd0\u7b97\u65f6\uff0c\u6709\u6570\u548c\u5bf9\u8c61\u7684\u6df7\u5408\u8fd0\u7b97\u65f6\uff0c\u5fc5\u987b\u4f7f\u7528\u53cb\u5143<\/p>\n

\n        3\u3001\u4e8c\u5143\u8fd0\u7b97\u7b26\u4e2d\uff0c\u7b2c\u4e00\u4e2a\u64cd\u4f5c\u6570\u4e3a\u975e\u5bf9\u8c61\u65f6\uff0c\u5fc5\u987b\u4f7f\u7528\u53cb\u5143\u51fd\u6570\u3002\u5982\u8f93\u5165\u8f93\u51fa\u8fd0\u7b97\u7b26<<\u548c>><\/p>\n

\n\u5177\u4f53\u89c4\u5219\u5982\u4e0b\uff1a<\/p>\n

\n\n\n\n\n\n\n\n\n
\n

\u8fd0\u7b97\u7b26<\/p>\n<\/td>\n

\n

\u5efa\u8bae\u4f7f\u7528<\/p>\n<\/td>\n<\/tr>\n

\n

\u6240\u6709\u4e00\u5143\u8fd0\u7b97\u7b26<\/p>\n<\/td>\n

\n

\u6210\u5458\u51fd\u6570<\/p>\n<\/td>\n<\/tr>\n

\n

\uff1d ( ) [ ]  -><\/p>\n<\/td>\n

\n

\u5fc5\u987b\u662f\u6210\u5458\u51fd\u6570<\/p>\n<\/td>\n<\/tr>\n

\n

+= -= \/= *= ^= &= != %= >>= <<= , 似\u4e4e\u5e26\u7b49\u53f7\u7684\u90fd\u5728\u8fd9\u91cc\u4e86.<\/p>\n<\/td>\n

\n

\u6210\u5458\u51fd\u6570<\/p>\n<\/td>\n<\/tr>\n

\n

\u6240\u6709\u5176\u5b83\u4e8c\u5143\u8fd0\u7b97\u7b26, \u4f8b\u5982: \u2013,+,*,\/<\/p>\n<\/td>\n

\n

\u53cb\u5143\u51fd\u6570<\/p>\n<\/td>\n<\/tr>\n

\n

<< >><\/p>\n<\/td>\n

\n

\u5fc5\u987b\u662f\u53cb\u5143\u51fd\u6570<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\n

\n2. \u53c2\u6570\u548c\u8fd4\u56de值<\/span><\/strong><\/p>\n

\n     \u5f53\u53c2\u6570\u4e0d\u4f1a\u88ab\u6539\u53d8\uff0c\u4e00\u822c\u6309const\u5f15\u7528\u6765\u4f20\u9012(\u82e5\u662f\u4f7f\u7528\u6210\u5458\u51fd\u6570\u91cd\u8f7d\uff0c\u51fd\u6570\u4e5f\u4e3aconst).<\/p>\n

\n     \u5bf9\u4e8e\u8fd4\u56de\u6570值\u7684\u51b3\u5b9a:<\/p>\n

\n     1) \u5982\u679c\u8fd4\u56de值\u53ef\u80fd\u51fa\u73b0\u5728=\u53f7\u5de6\u8fb9, \u5219\u53ea\u80fd\u4f5c\u4e3a\u5de6值, \u8fd4\u56de\u975econst\u5f15\u7528\u3002<\/p>\n

\n     2) \u5982\u679c\u8fd4\u56de值\u53ea\u80fd\u51fa\u73b0\u5728=\u53f7\u53f3\u8fb9, \u5219\u53ea\u9700\u4f5c\u4e3a\u53f3值, \u8fd4\u56deconst\u578b\u5f15\u7528\u6216\u8005const\u578b值\u3002<\/p>\n

\n     3) \u5982\u679c\u8fd4\u56de值\u65e2\u53ef\u80fd\u51fa\u73b0\u5728=\u53f7\u5de6\u8fb9\u6216\u8005\u53f3\u8fb9, \u5219\u5176\u8fd4\u56de值\u987b\u4f5c\u4e3a\u5de6值, \u8fd4\u56de\u975econst\u5f15\u7528\u3002<\/p>\n

\n\u8fd0\u7b97\u7b26\u91cd\u8f7d\u4e3e\u4f8b\uff1a<\/p>\n

\n+\u548c -\u8fd0\u7b97\u7b26\u7684\u91cd\u8f7d\uff1a<\/span><\/p>\n

\n
\n
\n[cpp]<\/strong> view
\n plain<\/a>copy<\/a>print<\/a>?<\/a><\/p>\n
\n<\/div>\n<\/div>\n<\/div>\n
    \n
  1. \nclass<\/span> Point    <\/span><\/span><\/li>\n
  2. \n{    <\/span><\/li>\n
  3. \nprivate<\/span>:    <\/span><\/span><\/li>\n
  4. \n    int<\/span> x;   <\/span><\/span><\/li>\n
  5. \npublic<\/span>:    <\/span><\/span><\/li>\n
  6. \n    Point(int<\/span> x1)  <\/span><\/span><\/li>\n
  7. \n    {   x=x1;}    <\/span><\/li>\n
  8. \n    Point(Point& p)     <\/span><\/li>\n
  9. \n    {   x=p.x;}  <\/span><\/li>\n
  10. \n    const<\/span> Point operator+(<\/span>const<\/span> Point& p);<\/span>\/\/\u4f7f\u7528\u6210\u5458\u51fd\u6570\u91cd\u8f7d\u52a0\u53f7\u8fd0\u7b97\u7b26<\/span>  <\/span><\/span><\/li>\n
  11. \n    friend<\/span> <\/span>const<\/span> Point operator-(<\/span>const<\/span> Point& p1,<\/span>const<\/span> Point& p2);<\/span>\/\/\u4f7f\u7528\u53cb\u5143\u51fd\u6570\u91cd\u8f7d\u51cf\u53f7\u8fd0\u7b97\u7b26<\/span>  <\/span><\/span><\/li>\n
  12. \n};    <\/span><\/li>\n
  13. \n  <\/span><\/li>\n
  14. \nconst<\/span> Point Point::operator+(<\/span>const<\/span> Point& p)  <\/span><\/span><\/li>\n
  15. \n{  <\/span><\/li>\n
  16. \n    return<\/span> Point(x+p.x);  <\/span><\/span><\/li>\n
  17. \n}  <\/span><\/li>\n
  18. \n  <\/span><\/li>\n
  19. \nPoint const<\/span> operator-(<\/span>const<\/span> Point& p1,<\/span>const<\/span> Point& p2)  <\/span><\/span><\/li>\n
  20. \n{  <\/span><\/li>\n
  21. \n    return<\/span> Point(p1.x-p2.x);  <\/span><\/span><\/li>\n
  22. \n}  <\/span><\/li>\n<\/ol>\n<\/div>\n

    \n\u8c03\u7528:<\/p>\n

    \n
    \n
    \n[cpp]<\/strong> view
    \n plain<\/a>    copy<\/a>print<\/a>?<\/a><\/p>\n
    \n<\/div>\n<\/div>\n<\/div>\n
      \n
    1. \nPoint a(1);    <\/span><\/li>\n
    2. \nPoint b(2);  <\/span><\/li>\n
    3. \na+b;  \/\/\u6b63\u786e\uff0c\u8c03\u7528\u6210\u5458\u51fd\u6570<\/span>  <\/span><\/span><\/li>\n
    4. \na-b;  \/\/\u6b63\u786e\uff0c\u8c03\u7528\u53cb\u5143\u51fd\u6570<\/span>  <\/span><\/span><\/li>\n
    5. \na+1;  \/\/\u6b63\u786e\uff0c\u5148\u8c03\u7528\u7c7b\u578b\u8f6c\u6362\u51fd\u6570\uff0c\u628a1\u53d8\u6210\u5bf9\u8c61\uff0c\u4e4b\u540e\u8c03\u7528\u6210\u5458\u51fd\u6570<\/span>  <\/span><\/span><\/li>\n
    6. \na-1;  \/\/\u6b63\u786e\uff0c\u5148\u8c03\u7528\u7c7b\u578b\u8f6c\u6362\u51fd\u6570\uff0c\u628a1\u53d8\u6210\u5bf9\u8c61\uff0c\u4e4b\u540e\u8c03\u7528\u53cb\u5143\u51fd\u6570<\/span>  <\/span><\/span><\/li>\n
    7. \n1+a;  \/\/\u9519\u8bef\uff0c\u8c03\u7528\u6210\u5458\u51fd\u6570\u65f6\uff0c\u7b2c\u4e00\u4e2a\u64cd\u4f5c\u6570\u5fc5\u987b\u662f\u5bf9\u8c61\uff0c\u56e0\u4e3a\u7b2c\u4e00\u4e2a\u64cd\u4f5c\u6570\u8fd8\u6709\u8c03\u7528\u6210\u5458\u51fd\u6570\u7684\u529f\u80fd<\/span>  <\/span><\/span><\/li>\n
    8. \n1-a;  \/\/\u6b63\u786e\uff0c\u5148\u7c7b\u578b\u8f6c\u6362 \u540e\u8c03\u7528\u53cb\u5143\u51fd\u6570<\/span>  <\/span><\/span><\/li>\n<\/ol>\n<\/div>\n

      \n\u603b\u7ed3\uff1a<\/p>\n

      \n1\u3001\u7531\u4e8e+ -\u90fd\u662f\u51fa\u73b0\u5728=\u53f7\u7684\u53f3\u8fb9\uff0c\u5982c=a+b\uff0c\u5373\u4f1a\u8fd4\u56de\u4e00\u4e2a\u53f3值\uff0c\u53ef\u4ee5\u8fd4\u56deconst\u578b值
      \n2\u3001\u540e\u51e0\u4e2a\u8868\u8fbe\u5f0f\u8ba8\u8bba\u7684\u5c31\u662f\uff0c\u6570\u548c\u5bf9\u8c61\u6df7\u5408\u8fd0\u7b97\u7b26\u7684\u60c5\u51b5\uff0c\u4e00\u822c\u51fa\u73b0\u8fd9\u79cd\u60c5\u51b5\uff0c\u5e38\u4f7f\u7528\u53cb\u5143\u51fd\u6570<\/p>\n

      \n3\u3001\u53cc\u76ee\u8fd0\u7b97\u7b26\u7684\u91cd\u8f7d\uff1a<\/span><\/p>\n

      \n      \u91cd\u8f7d\u8fd0\u7b97\u7b26\u51fd\u6570\u540d\uff1aoperator@(\u53c2\u6570\u8868)<\/p>\n

      \n      \u9690\u5f0f\u8c03\u7528\u5f62\u5f0f\uff1aobj1+obj2<\/p>\n

      \n      \u663e\u5f0f\u8c03\u7528\u5f62\u5f0f\uff1aobj1.operator+(OBJ obj2)---\u6210\u5458\u51fd\u6570<\/p>\n

      \n                                  operator+(OBJ obj1\uff0cOBJ obj2)---\u53cb\u5143\u51fd\u6570<\/p>\n

      \n      \u6267\u884c\u65f6\uff0c\u9690\u5f0f\u8c03\u7528\u5f62\u5f0f\u548c\u663e\u5f0f\u8c03\u7528\u5f62\u5f0f\u90fd\u4f1a\u8c03\u7528\u51fd\u6570operator+()<\/p>\n

      \n++\u548c--\u8fd0\u7b97\u7b26\u7684\u91cd\u8f7d\uff1a<\/span><\/p>\n

      \n
      \n
      \n[cpp]<\/strong> view
      \n plain<\/a>      copy<\/a>print<\/a>?<\/a><\/p>\n
      \n<\/div>\n<\/div>\n<\/div>\n
        \n
      1. \nclass<\/span> Point    <\/span><\/span><\/li>\n
      2. \n{    <\/span><\/li>\n
      3. \nprivate<\/span>:    <\/span><\/span><\/li>\n
      4. \n    int<\/span> x;   <\/span><\/span><\/li>\n
      5. \npublic<\/span>:    <\/span><\/span><\/li>\n
      6. \n    Point(int<\/span> x1)  <\/span><\/span><\/li>\n
      7. \n    {   x=x1;}    <\/span><\/li>\n
      8. \n    Point operator++();\/\/\u6210\u5458\u51fd\u6570\u5b9a\u4e49\u81ea\u589e<\/span>  <\/span><\/span><\/li>\n
      9. \n    const<\/span> Point operator++(<\/span>int<\/span> x); <\/span>\/\/\u540e\u7f00\u53ef\u4ee5\u8fd4\u56de\u4e00\u4e2aconst\u7c7b\u578b\u7684值<\/span>  <\/span><\/span><\/li>\n
      10. \n    friend<\/span> Point operator--(Point& p);<\/span>\/\/\u53cb\u5143\u51fd\u6570\u5b9a\u4e49--<\/span>  <\/span><\/span><\/li>\n
      11. \n    friend<\/span> <\/span>const<\/span> Point operator--(Point& p,<\/span>int<\/span> x);<\/span>\/\/\u540e\u7f00\u53ef\u4ee5\u8fd4\u56de\u4e00\u4e2aconst\u7c7b\u578b\u7684值<\/span>  <\/span><\/span><\/li>\n
      12. \n};    <\/span><\/li>\n
      13. \n  <\/span><\/li>\n
      14. \nPoint Point::operator++()\/\/++obj<\/span>  <\/span><\/span><\/li>\n
      15. \n{  <\/span><\/li>\n
      16. \n    x++;  <\/span><\/li>\n
      17. \n    return<\/span> *<\/span>this<\/span>;  <\/span><\/span><\/li>\n
      18. \n}  <\/span><\/li>\n
      19. \nconst<\/span> Point Point::operator++(<\/span>int<\/span> x)<\/span>\/\/obj++<\/span>  <\/span><\/span><\/li>\n
      20. \n{  <\/span><\/li>\n
      21. \n    Point temp = *this<\/span>;  <\/span><\/span><\/li>\n
      22. \n    this<\/span>->x++;  <\/span><\/span><\/li>\n
      23. \n    return<\/span> temp;  <\/span><\/span><\/li>\n
      24. \n}  <\/span><\/li>\n
      25. \nPoint operator--(Point& p)\/\/--obj<\/span>  <\/span><\/span><\/li>\n
      26. \n{  <\/span><\/li>\n
      27. \n    p.x--;  <\/span><\/li>\n
      28. \n    return<\/span> p;  <\/span><\/span><\/li>\n
      29. \n         \/\/\u524d\u7f00\u5f62\u5f0f(--obj)\u91cd\u8f7d\u7684\u65f6\u5019\u6ca1\u6709\u865a\u53c2,\u901a\u8fc7\u5f15\u7528\u8fd4\u56de*this \u6216 \u81ea\u8eab\u5f15\u7528,\u4e5f\u5c31\u662f\u8fd4\u56de\u53d8\u5316\u4e4b\u540e\u7684\u6570值<\/span>  <\/span><\/span><\/li>\n
      30. \n}  <\/span><\/li>\n
      31. \nconst<\/span> Point operator--(Point& p,<\/span>int<\/span> x)<\/span>\/\/obj--<\/span>  <\/span><\/span><\/li>\n
      32. \n{  <\/span><\/li>\n
      33. \n    Point temp = p;  <\/span><\/li>\n
      34. \n    p.x--;  <\/span><\/li>\n
      35. \n    return<\/span> temp;  <\/span><\/span><\/li>\n
      36. \n         \/\/ \u540e\u7f00\u5f62\u5f0fobj--\u91cd\u8f7d\u7684\u65f6\u5019\u6709\u4e00\u4e2aint\u7c7b\u578b\u7684\u865a\u53c2, \u8fd4\u56de\u539f\u72b6\u6001\u7684\u62f7\u8d1d<\/span>  <\/span><\/span><\/li>\n
      37. \n}  <\/span><\/li>\n<\/ol>\n<\/div>\n

        \n\u51fd\u6570\u8c03\u7528\uff1a<\/p>\n

        \n
        \n
        \n[cpp]<\/strong> view
        \n plain<\/a>        copy<\/a>print<\/a>?<\/a><\/p>\n
        \n<\/div>\n<\/div>\n<\/div>\n
          \n
        1. \n<pre <\/span>class<\/span>=<\/span>"cpp"<\/span> name=<\/span>"code"<\/span>>Point a(1);  <\/span><\/span><\/li>\n
        2. \nPoint b(2);  <\/span><\/li>\n
        3. \na++;\/\/\u9690\u5f0f\u8c03\u7528\u6210\u5458\u51fd\u6570operator++(0),\u540e\u7f00\u8868\u8fbe\u5f0f<\/span>  <\/span><\/span><\/li>\n
        4. \n++a;\/\/\u9690\u5f0f\u8c03\u7528\u6210\u5458\u51fd\u6570operator++(),\u524d\u7f00\u8868\u8fbe\u5f0f<\/span>  <\/span><\/span><\/li>\n
        5. \nb--;\/\/\u9690\u5f0f\u8c03\u7528\u53cb\u5143\u51fd\u6570operator--(0),\u540e\u7f00\u8868\u8fbe\u5f0f<\/span>  <\/span><\/span><\/li>\n
        6. \n--b;\/\/\u9690\u5f0f\u8c03\u7528\u53cb\u5143\u51fd\u6570operator--(),\u524d\u7f00\u8868\u8fbe\u5f0f<\/span>  <\/span><\/span><\/li>\n
        7. \ncout<<a.operator ++(2);\/\/\u663e\u5f0f\u8c03\u7528\u6210\u5458\u51fd\u6570operator ++(2)\uff0c\u540e\u7f00\u8868\u8fbe\u5f0f<\/span>  <\/span><\/span><\/li>\n
        8. \ncout<<a.operator ++();\/\/\u663e\u5f0f\u8c03\u7528\u6210\u5458\u51fd\u6570operator ++()\uff0c\u524d\u7f00\u8868\u8fbe\u5f0f<\/span>  <\/span><\/span><\/li>\n
        9. \ncout<<operator --(b,2);\/\/\u663e\u5f0f\u8c03\u7528\u53cb\u5143\u51fd\u6570operator --(2)\uff0c\u540e\u7f00\u8868\u8fbe\u5f0f<\/span>  <\/span><\/span><\/li>\n
        10. \ncout<<operator --(b);\/\/\u663e\u5f0f\u8c03\u7528\u53cb\u5143\u51fd\u6570operator --()\uff0c\u524d\u7f00\u8868\u8fbe\u5f0f <\/pre><\/span>  <\/span><\/span><\/li>\n<\/ol>\n<\/div>\n

          \n \u603b\u7ed3\uff1a<\/p>\n

          \n1\u3001a++<\/p>\n

          \n       \u51fd\u6570\u8fd4\u56de\uff1atemp(\u4e34\u65f6\u53d8\u91cf)<\/p>\n

          \n       \u51fd\u6570\u8fd4\u56de\u662f\u5426\u662fconst\u7c7b\u578b\uff1a\u8fd4\u56de\u662f\u4e00\u4e2a\u62f7\u8d1d\u540e\u7684\u4e34\u65f6\u53d8\u91cf)\uff0c\u4e0d\u80fd\u51fa\u73b0\u5728\u7b49\u53f7\u7684\u5de6\u8fb9(\u4e34\u65f6\u53d8\u91cf\u4e0d\u80fd\u505a\u5de6值)\uff0c\u51fd\u6570\u7684\u7ed3\u679c\u53ea\u80fd\u505a\u53f3值\uff0c\u5219\u8981\u8fd4\u56de\u4e00\u4e2aconst\u7c7b\u578b\u7684值<\/p>\n

          \n      ++a<\/p>\n

          \n       \u51fd\u6570\u8fd4\u56de\uff1a*this;<\/p>\n

          \n      \u51fd\u6570\u8fd4\u56de\u662f\u5426\u662fconst\u7c7b\u578b\uff1a\u8fd4\u56de\u539f\u72b6\u6001\u7684\u672c\u8eab\uff0c\u8fd4\u56de值\u53ef\u4ee5\u505a\u5de6值\uff0c\u5373\u51fd\u6570\u7684\u7ed3\u679c\u53ef\u4ee5\u505a\u5de6值\uff0c\u5219\u8981\u8fd4\u56de\u4e00\u4e2a\u975econst\u7c7b\u578b\u7684值<\/p>\n

          \n2\u3001\u524d\u540e\u7f00\u4ec5\u4ece\u51fd\u6570\u540d(operator++)\u65e0\u6cd5\u533a\u5206\uff0c\u53ea\u80fd\u6709\u53c2\u6570\u533a\u5206\uff0c\u8fd9\u91cc\u5f15\u5165\u4e00\u4e2a\u865a\u53c2\u6570int x\uff0cx\u53ef\u4ee5\u662f\u4efb\u610f\u6574\u6570\u3002<\/p>\n

          \n3\u3001\u5355\u76ee\u8fd0\u7b97\u7b26\u7684\u91cd\u8f7d\uff1a<\/span><\/p>\n

          \n      \u91cd\u8f7d\u8fd0\u7b97\u7b26\u51fd\u6570\u540d\uff1aoperator@(\u53c2\u6570\u8868)<\/p>\n

          \n      \u9690\u5f0f\u8c03\u7528\u5f62\u5f0f\uff1aobj1@  \u6216 @obj1<\/p>\n

          \n      \u663e\u5f0f\u8c03\u7528\u5f62\u5f0f\uff1a<\/p>\n

          \n             \u6210\u5458\u51fd\u6570:<\/p>\n

          \n                    obj1.operator@( )\/\/\u524d\u7f00<\/p>\n

          \n                    obj1.operator@(0)\/\/\u540e\u7f00<\/p>\n

          \n             \u53cb\u5143\u51fd\u6570:<\/p>\n

          \n                    operator@(OBJ obj)\/\/\u524d\u7f00<\/p>\n

          \n                    operator@(OBJ obj,int x)\/\/\u540e\u7f00<\/p>\n

          \n      \u6267\u884c\u65f6\uff0c\u9690\u5f0f\u8c03\u7528\u5f62\u5f0f\u548c\u663e\u5f0f\u8c03\u7528\u5f62\u5f0f\u90fd\u4f1a\u8c03\u7528\u51fd\u6570operator@()<\/p>\n

          \n \u91cd\u8f7d\u4e0b\u6807\u8fd0\u7b97\u7b26[ ]<\/span><\/p>\n

          \n
          \n
          \n[cpp]<\/strong> view
          \n plain<\/a>          copy<\/a>print<\/a>?<\/a><\/p>\n
          \n<\/div>\n<\/div>\n<\/div>\n
            \n
          1. \nclass<\/span> Point    <\/span><\/span><\/li>\n
          2. \n{    <\/span><\/li>\n
          3. \nprivate<\/span>:    <\/span><\/span><\/li>\n
          4. \n    int<\/span> x[5];   <\/span><\/span><\/li>\n
          5. \npublic<\/span>:    <\/span><\/span><\/li>\n
          6. \n    Point()  <\/span><\/li>\n
          7. \n    {  <\/span><\/li>\n
          8. \n        for<\/span> (<\/span>int<\/span> i=0;i<5;i++)  <\/span><\/span><\/li>\n
          9. \n        {  <\/span><\/li>\n
          10. \n            x[i]=i;  <\/span><\/li>\n
          11. \n        }  <\/span><\/li>\n
          12. \n    }   <\/span><\/li>\n
          13. \n    int<\/span>& operator[](<\/span>int<\/span> y);  <\/span><\/span><\/li>\n
          14. \n};    <\/span><\/li>\n
          15. \nint<\/span>& Point::operator[](<\/span>int<\/span> y)  <\/span><\/span><\/li>\n
          16. \n{  <\/span><\/li>\n
          17. \n    static<\/span> <\/span>int<\/span> t=0;  <\/span><\/span><\/li>\n
          18. \n    if<\/span> (y<5)  <\/span><\/span><\/li>\n
          19. \n    {  <\/span><\/li>\n
          20. \n        return<\/span> x[y];  <\/span><\/span><\/li>\n
          21. \n    }  <\/span><\/li>\n
          22. \n    else<\/span>  <\/span><\/span><\/li>\n
          23. \n    {  <\/span><\/li>\n
          24. \n        cout<<"\u4e0b\u6807\u51fa\u754c"<\/span>;  <\/span><\/span><\/li>\n
          25. \n        return<\/span> t;  <\/span><\/span><\/li>\n
          26. \n    }     <\/span><\/li>\n
          27. \n}  <\/span><\/li>\n<\/ol>\n<\/div>\n

            \n\u8c03\u7528\uff1a<\/span><\/p>\n

            \n
            \n
            \n[cpp]<\/strong> view
            \n plain<\/a>            copy<\/a>print<\/a>?<\/a><\/p>\n
            \n<\/div>\n<\/div>\n<\/div>\n
              \n
            1. \nPoint a;  <\/span><\/li>\n
            2. \nfor<\/span> (<\/span>int<\/span> i=0;i<10;i++)  <\/span><\/span><\/li>\n
            3. \n{  <\/span><\/li>\n
            4. \n         cout<<a[i]<<endl;\/\/\u65e0\u8bbai\u4e0b\u6807\u662f\u5426\u8d8a\u754c\uff0c\u6bcf\u5f53\u4f7f\u7528a[i]\u65f6\uff0c\u90fd\u4f1a\u8c03\u7528[]\u7684\u91cd\u8f7d<\/span>  <\/span><\/span><\/li>\n
            5. \n}  <\/span><\/li>\n
            6. \na[0]=10;  <\/span><\/li>\n<\/ol>\n<\/div>\n

              \n\u91cd\u8f7d\u4e0b\u6807\u8fd0\u7b97\u7b26[ ]\u7684\u76ee\u7684\uff1a<\/p>\n

              \n          1\u3001\u5bf9\u8c61[x]  \u7c7b似\u4e8e \u6570\u7ec4\u540d[x]\uff0c\u66f4\u52a0\u7b26\u5408\u4e60\u60ef<\/span><\/p>\n

              \n          2\u3001\u53ef\u4ee5\u5bf9\u4e0b\u6807\u8d8a\u754c\u4f5c\u51fa\u5224\u65ad<\/span><\/p>\n

              \n\u8bed\u6cd5\uff1a<\/p>\n

              \n        \u91cd\u8f7d\u65b9\u5f0f\uff1a\u53ea\u80fd\u4f7f\u7528\u6210\u5458\u51fd\u6570\u91cd\u8f7d<\/p>\n

              \n        \u51fd\u6570\u540d\uff1aoperator[ ](\u53c2\u6570\u8868)<\/p>\n

              \n        \u53c2\u6570\u8868\uff1a\u4e00\u4e2a\u53c2\u6570\uff0c\u4e14\u4ec5\u6709\u4e00\u4e2a\u53c2\u6570\uff0c\u8be5\u53c2\u6570\u8bbe\u5b9a\u4e86\u4e0b\u6807值\uff0c\u901a\u5e38\u4e3a\u6574\u578b\uff0c\u4f46\u662f\u4e5f\u53ef\u4ee5\u4e3a\u5b57\u7b26\u4e32( \u770b\u6210\u4e0b\u6807)\u3002<\/p>\n

              \n        \u51fd\u6570\u8c03\u7528\uff1a\u663e\u5f0f\u8c03\u7528\uff1aObj[arg]-\u5bf9\u8c61[\u4e0b\u6807]<\/p>\n

              \n                              \u9690\u5f0f\u8c03\u7528\uff1aobj.operator[ ](arg)  <\/p>\n

              \n        \u8fd4\u56de\u7c7b\u578b\uff1a<\/p>\n

              \n               1\u3001\u8fd4\u56de\u51fd\u6570\u5f15\u7528 + \u8fd4\u56de\u6210\u5458\u7684\u5b9e\u9645\u7c7b\u578b\uff08\u7531\u7a0b\u5e8f\u5458\u6839\u636e\u51fd\u6570\u4f53\u5b9a\u4e49\uff09<\/p>\n

              \n               2\u3001\u56e0\u4e3a\u8fd4\u56de值\u53ef\u4ee5\u505a\u5de6值\u548c\u53f3值\uff0c\u5e94\u8be5\u4e0d\u4f7f\u7528\u8fd4\u56de值\u4e3aconst\u7c7b\u578b<\/p>\n

              \n                     \u4f46\u662f\uff0c\u4e3a\u4e86\u80fd\u8bbf\u95eeconst\u5bf9\u8c61\uff0c\u4e0b\u6807\u8fd0\u7b97\u7b26\u91cd\u8f7d\u6709\u975econst\u548cconst\u4e24\u4e2a\u7248\u672c\u3002\uff08\u5f85\u5b9a\u5199\uff09<\/p>\n

              \n \u5982\uff1aint&<\/span>  Point::operator[](int y)\/\/\u4e3a\u4ec0\u4e48\u4f7f\u7528\u8fd4\u56de\u5f15\u7528\uff1a\u8fd4\u56de\u7684值\u53ef\u4ee5\u505a\u5de6值\uff0c\u4e5f\u53ef\u4ee5\u505a\u53f3值\uff0c\u5219\u5fc5\u987b\u4f7f\u7528\u8fd4\u56de\u5f15\u7528<\/p>\n

              \n \u91cd\u8f7d\u8fd0\u7b97\u7b26( )<\/p>\n

              \n
              \n
              \n[cpp]<\/strong> view
              \n plain<\/a>              copy<\/a>print<\/a>?<\/a><\/p>\n
              \n<\/div>\n<\/div>\n<\/div>\n
                \n
              1. \nclass<\/span> Point    <\/span><\/span><\/li>\n
              2. \n{    <\/span><\/li>\n
              3. \nprivate<\/span>:    <\/span><\/span><\/li>\n
              4. \n    int<\/span> x;   <\/span><\/span><\/li>\n
              5. \npublic<\/span>:    <\/span><\/span><\/li>\n
              6. \n    Point(int<\/span> x1)  <\/span><\/span><\/li>\n
              7. \n    {   x=x1;}    <\/span><\/li>\n
              8. \n    const<\/span> <\/span>int<\/span> operator()(<\/span>const<\/span> Point& p);  <\/span><\/span><\/li>\n
              9. \n};    <\/span><\/li>\n
              10. \n  <\/span><\/li>\n
              11. \nconst<\/span> <\/span>int<\/span> Point::operator()(<\/span>const<\/span> Point& p)  <\/span><\/span><\/li>\n
              12. \n{  <\/span><\/li>\n
              13. \n    return<\/span> (x+p.x);  <\/span><\/span><\/li>\n
              14. \n}  <\/span><\/li>\n<\/ol>\n<\/div>\n
                \n
                \n
                \n[cpp]<\/strong> view
                \n plain<\/a>                copy<\/a>print<\/a>?<\/a><\/p>\n
                \n<\/div>\n<\/div>\n<\/div>\n
                  \n
                1. \n\u8c03\u7528\uff1a  <\/span><\/li>\n
                2. \nPoint a(1);  <\/span><\/li>\n
                3. \nPoint b(2);  <\/span><\/li>\n
                4. \ncout<<a(b);  <\/span><\/li>\n<\/ol>\n<\/div>\n

                  \n\u91cd\u8f7d\u8fd0\u7b97\u7b26( )\u7684\u76ee\u7684\uff1a<\/p>\n

                  \n          1\u3001\u5bf9\u8c61( )  \u7c7b似\u4e8e \u51fd\u6570\u540d(x)\uff0c\u66f4\u52a0\u7b26\u5408\u4e60\u60ef<\/span><\/p>\n

                  \n\u8bed\u6cd5\uff1a<\/p>\n

                  \n        \u91cd\u8f7d\u65b9\u5f0f\uff1a\u53ea\u80fd\u4f7f\u7528\u6210\u5458\u51fd\u6570\u91cd\u8f7d<\/p>\n

                  \n        \u91cd\u8f7d\u540e\u8fd8\u53ef\u4ee5\u7ee7\u7eed\u91cd\u8f7d<\/p>\n

                  \n        \u51fd\u6570\u540d\uff1aoperator( )(\u53c2\u6570\u8868)<\/p>\n

                  \n        \u53c2\u6570\u8868\uff1a\u53c2\u6570\u968f\u610f\uff0c\u5177\u4f53\u6839\u636e\u5b9e\u9645\u60c5\u51b5\u800c\u5b9a\u3002<\/p>\n

                  \n        \u51fd\u6570\u8c03\u7528\uff1a\u663e\u5f0f\u8c03\u7528\uff1aObj(x)<\/p>\n

                  \n                            \u9690\u5f0f\u8c03\u7528\uff1aobj.operator( )(x)  <\/p>\n

                  \n        \u8fd4\u56de\u7c7b\u578b\uff1a<\/p>\n

                  \n               1\u3001\u8fd4\u56de\u6210\u5458\u7684\u5b9e\u9645\u7c7b\u578b\u968f\u610f\uff0c\u5177\u4f53\u7531\u7a0b\u5e8f\u5458\u6839\u636e\u51fd\u6570\u4f53\u5b9a\u4e49<\/p>\n

                  \n               2\u3001\u56e0\u4e3a\u8fd4\u56de值\u53ea\u80fd\u505a\u53f3值\uff0c\u53ea\u8bfb\uff0c\u5e94\u8be5\u4f7f\u7528\u8fd4\u56de值\u4e3aconst\u7c7b\u578b<\/p>\n

                  \n
                  \n\u91cd\u8f7d\u8f93\u5165\u8f93\u51fa\u64cd\u4f5c\u7b26<< >><\/p>\n

                  \n
                  \n
                  \n[cpp]<\/strong> view
                  \n plain<\/a>                  copy<\/a>print<\/a>?<\/a><\/p>\n
                  \n<\/div>\n<\/div>\n<\/div>\n
                    \n
                  1. \nclass<\/span> Point    <\/span><\/span><\/li>\n
                  2. \n{    <\/span><\/li>\n
                  3. \nprivate<\/span>:    <\/span><\/span><\/li>\n
                  4. \n    int<\/span> x;   <\/span><\/span><\/li>\n
                  5. \npublic<\/span>:    <\/span><\/span><\/li>\n
                  6. \n    Point(int<\/span> x1)  <\/span><\/span><\/li>\n
                  7. \n    {   x=x1;}   <\/span><\/li>\n
                  8. \n    friend<\/span> ostream& operator<<(ostream& cout,<\/span>const<\/span> Point& p);<\/span>\/\/\u4f7f\u7528\u53cb\u5143\u51fd\u6570\u91cd\u8f7d<<\u8f93\u51fa\u8fd0\u7b97\u7b26<\/span>  <\/span><\/span><\/li>\n
                  9. \n    friend<\/span> istream& operator>>(istream& cin,Point& p);<\/span>\/\/\u4f7f\u7528\u53cb\u5143\u51fd\u6570\u91cd\u8f7d>>\u8f93\u51fa\u8fd0\u7b97\u7b26<\/span>  <\/span><\/span><\/li>\n
                  10. \n};    <\/span><\/li>\n
                  11. \nostream& operator<<(ostream& cout,const<\/span> Point& p)  <\/span><\/span><\/li>\n
                  12. \n{  <\/span><\/li>\n
                  13. \n    cout<<p.x<<endl;  <\/span><\/li>\n
                  14. \n    return<\/span> cout;  <\/span><\/span><\/li>\n
                  15. \n}  <\/span><\/li>\n
                  16. \nistream& operator>>(istream& cin,Point& p)  <\/span><\/li>\n
                  17. \n{  <\/span><\/li>\n
                  18. \n    cin>>p.x;  <\/span><\/li>\n
                  19. \n    return<\/span> cin;  <\/span><\/span><\/li>\n
                  20. \n}  <\/span><\/li>\n<\/ol>\n<\/div>\n
                    \n
                    \n
                    \n[cpp]<\/strong> view
                    \n plain<\/a>                    copy<\/a>print<\/a>?<\/a><\/p>\n
                    \n<\/div>\n<\/div>\n<\/div>\n
                      \n
                    1. \n\u8c03\u7528\uff1a  <\/span><\/li>\n
                    2. \nPoint a(1);  <\/span><\/li>\n
                    3. \nPoint b(2);  <\/span><\/li>\n
                    4. \ncin>>a>>b;  <\/span><\/li>\n
                    5. \ncout<<a<<b<<endl;   <\/span><\/li>\n<\/ol>\n<\/div>\n

                      \n\u8bed\u6cd5\uff1a<\/p>\n

                      \n\u91cd\u8f7d\u65b9\u5f0f\uff1a\u53ea\u80fd\u4f7f\u7528\u53cb\u5143\u51fd\u6570\u91cd\u8f7d \u4e14 \u4f7f\u7528\u4e09\u4e2a\u5f15\u7528&<\/p>\n

                      \n\u51fd\u6570\u540d\uff1a<\/p>\n

                      \n       \u8f93\u51fa\u6d41\uff1a operator<<(\u53c2\u6570\u8868)<\/p>\n

                      \n       \u8f93\u5165\u6d41\uff1aoperator>>(\u53c2\u6570\u8868)<\/p>\n

                      \n\u53c2\u6570\u8868\uff1a\u56fa\u5b9a\uff08\u5bb9\u6613\u51fa\u9519\u554a\uff09\uff0c\u4e24\u4e2a\u53c2\u6570\u5747\u7528\u5f15\u7528&<\/span><\/p>\n

                      \n       \u8f93\u51fa\u6d41\uff1a \u5fc5\u987b\u662f\u4e24\u4e2a\u53c2\u6570\uff1a\u5bf9\u8f93\u51fa\u6d41ostream&<\/span> \u548c \u5bf9\u8c61<\/p>\n

                      \n                        \u7b2c\u4e00\u4e2a\u64cd\u4f5c\u6570cout\uff0c\u5b9a\u4e49\u5728\u6587\u4ef6iostream\u4e2d\uff0c\u662f\u6807\u51c6\u7c7b\u7c7b\u578bostream\u7684\u5bf9\u8c61\u7684\u5f15\u7528\u3002<\/p>\n

                      \n                        \u5982\uff1aostream& cout,const Point& p<\/p>\n

                      \n       \u8f93\u5165\u6d41\uff1a\u5fc5\u987b\u662f\u4e24\u4e2a\u53c2\u6570\uff1a\u5bf9\u8f93\u5165\u6d41ostream&<\/span> \u548c \u5bf9\u8c61<\/p>\n

                      \n                       \u7b2c\u4e00\u4e2a\u64cd\u4f5c\u6570\u662fcin\uff0c\u5b9a\u4e49\u5728\u6587\u4ef6iostream\uff0c\u5b9e\u9645\u4e0a\u662f\u6807\u51c6\u7c7b\u7c7b\u578bistream\u7684\u5bf9\u8c61\u7684\u5f15\u7528<\/p>\n

                      \n                       \u5982\uff1ainstream& cin,const Point& p<\/p>\n

                      \n\u51fd\u6570\u8c03\u7528\uff1a<\/p>\n

                      \n       \u8f93\u51fa\u6d41\uff1a \u663e\u5f0f\u8c03\u7528\uff1acout<<\u5bf9\u8c61<\/p>\n

                      \n                        \u9690\u5f0f\u8c03\u7528\uff1a operator<<(cout\uff0c\u5bf9\u8c61)<\/p>\n

                      \n       \u8f93\u5165\u6d41\uff1a\u663e\u5f0f\u8c03\u7528\uff1acin>>\u5bf9\u8c61<\/p>\n

                      \n                        \u9690\u5f0f\u8c03\u7528\uff1a operator>>(cin\uff0c\u5bf9\u8c61)<\/p>\n

                      \n\u8fd4\u56de\u7c7b\u578b\uff1a\u8fd4\u56de\u7c7b\u578b\u56fa\u5b9a + \u4f7f\u7528\u8fd4\u56de\u51fd\u6570\u5f15\u7528\uff08\u6ee1\u8db3\u8fde\u7eed\u8f93\u51fa\uff09<\/p>\n

                      \n       \u8f93\u51fa\u6d41\uff1a \u8fd4\u56deostream&<\/p>\n

                      \n                        \u5982\uff1aostream& operator<<(ostream& cout,const Point& p)<\/p>\n

                      \n       \u8f93\u5165\u6d41\uff1a\u8fd4\u56de\uff1aistream&<\/p>\n

                      \n                        \u5982\uff1aistream& operator>>(istream& cin,Point& p)<\/p>\n

                      \n\u6ce8\u610f\uff1a\u4e3a\u4ec0\u4e48\u8f93\u5165\u8f93\u51fa\u64cd\u4f5c\u7b26\u7684\u91cd\u8f7d\u5fc5\u987b\u4f7f\u7528\u53cb\u5143\u51fd\u6570\uff1f<\/p>\n

                      \n\u56e0\u4e3a\uff1a\u6210\u5458\u51fd\u6570\u8981\u6c42\u662f\u6709\u5bf9\u8c61\u8c03\u7528\uff0c\u5219\u7b2c\u4e00\u4e2a\u53c2\u6570\u5fc5\u987b\u662f\u7c7b\u7684\u5bf9\u8c61\uff0c\u4f46\u662f<<\u548c>>\u7b2c\u4e00\u4e2a\u53c2\u6570\u662f\u6d41\u7684\u5bf9\u8c61\u5f15\u7528\u3002<\/p>\n

                      \n\u6545\uff0c\u4e0d\u80fd\u4f7f\u7528\u6210\u5458\u51fd\u6570<\/p>\n","protected":false},"excerpt":{"rendered":"

                      \u4ec0\u4e48\u662f\u8fd0\u7b97\u7b26\u7684\u91cd\u8f7d?        &n […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","footnotes":""},"categories":[3],"tags":[29],"class_list":["post-215","post","type-post","status-publish","format-standard","hentry","category-defaultcategory","tag-c"],"yoast_head":"\n\u8fd0\u7b97\u7b26\u91cd\u8f7d - nike0good<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/nike0good.com\/?p=215\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u8fd0\u7b97\u7b26\u91cd\u8f7d - nike0good\" \/>\n<meta property=\"og:description\" content=\"\u4ec0\u4e48\u662f\u8fd0\u7b97\u7b26\u7684\u91cd\u8f7d? 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