{"id":78759,"date":"2026-02-28T06:32:44","date_gmt":"2026-02-27T22:32:44","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/78759.html"},"modified":"2026-02-28T06:32:44","modified_gmt":"2026-02-27T22:32:44","slug":"c%e8%bf%9b%e9%98%b6%ef%bc%9aconst%e6%88%90%e5%91%98%e5%87%bd%e6%95%b0%e4%b8%8e%e5%8f%96%e5%9c%b0%e5%9d%80%e9%87%8d%e8%bd%bd%e8%af%a6%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/78759.html","title":{"rendered":"C++\u8fdb\u9636\uff1aconst\u6210\u5458\u51fd\u6570\u4e0e\u53d6\u5730\u5740\u91cd\u8f7d\u8be6\u89e3"},"content":{"rendered":"<h4>C&#043;&#043; \u7c7b\u548c\u5bf9\u8c61&#xff08;\u56db&#xff09;&#xff1a;const\u6210\u5458\u51fd\u6570\u3001\u53d6\u5730\u5740\u8fd0\u7b97\u7b26\u91cd\u8f7d\u5168\u7cbe\u8bb2<\/h4>\n<p>\u5728C&#043;&#043;\u4e2d&#xff0c;\u7c7b\u548c\u5bf9\u8c61\u662f\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u7684\u6838\u5fc3\u6982\u5ff5\u3002const\u6210\u5458\u51fd\u6570\u548c\u53d6\u5730\u5740\u8fd0\u7b97\u7b26\u91cd\u8f7d\u662f\u4e24\u4e2a\u91cd\u8981\u7684\u9ad8\u7ea7\u7279\u6027&#xff0c;\u7528\u4e8e\u589e\u5f3a\u4ee3\u7801\u7684\u5b89\u5168\u6027\u3001\u7075\u6d3b\u6027\u548c\u53ef\u8bfb\u6027\u3002\u672c\u7cbe\u8bb2\u5c06\u8be6\u7ec6\u89e3\u6790\u8fd9\u4e24\u4e2a\u4e3b\u9898&#xff0c;\u5305\u62ec\u5b9a\u4e49\u3001\u8bed\u6cd5\u3001\u5e94\u7528\u573a\u666f\u548c\u793a\u4f8b\u4ee3\u7801\u3002\u6211\u4eec\u5c06\u5206\u6b65\u8bb2\u89e3&#xff0c;\u786e\u4fdd\u5185\u5bb9\u6e05\u6670\u6613\u61c2\u3002<\/p>\n<h5>\u4e00\u3001const\u6210\u5458\u51fd\u6570<\/h5>\n<p>\u5b9a\u4e49\u548c\u76ee\u7684<br \/>\nconst\u6210\u5458\u51fd\u6570\u662f\u6307\u5728\u51fd\u6570\u58f0\u660e\u540e\u6dfb\u52a0const\u5173\u952e\u5b57\u7684\u6210\u5458\u51fd\u6570\u3002\u5b83\u8868\u793a\u8be5\u51fd\u6570\u4e0d\u4f1a\u4fee\u6539\u5bf9\u8c61\u7684\u4efb\u4f55\u6210\u5458\u53d8\u91cf&#xff08;\u9664\u975e\u6210\u5458\u53d8\u91cf\u88ab\u58f0\u660e\u4e3amutable&#xff09;\u3002\u8fd9\u5141\u8bb8\u5728const\u5bf9\u8c61\u4e0a\u8c03\u7528\u8be5\u51fd\u6570&#xff0c;\u63d0\u9ad8\u4ee3\u7801\u7684\u5b89\u5168\u6027\u3002\u4f8b\u5982&#xff0c;\u5982\u679c\u4e00\u4e2a\u5bf9\u8c61\u88ab\u58f0\u660e\u4e3aconst MyClass obj;&#xff0c;\u90a3\u4e48\u53ea\u80fd\u8c03\u7528\u5176const\u6210\u5458\u51fd\u6570\u3002<\/p>\n<p>\u4e3a\u4ec0\u4e48\u91cd\u8981<\/p>\n<ul>\n<li>\u5b89\u5168\u6027&#xff1a;\u9632\u6b62\u610f\u5916\u4fee\u6539\u5bf9\u8c61\u72b6\u6001&#xff0c;\u5c24\u5176\u5728\u591a\u7ebf\u7a0b\u6216\u5171\u4eab\u6570\u636e\u73af\u5883\u4e2d\u3002<\/li>\n<li>\u7075\u6d3b\u6027&#xff1a;const\u5bf9\u8c61\u53ea\u80fd\u8c03\u7528const\u6210\u5458\u51fd\u6570&#xff0c;\u8fd9\u5f3a\u5236\u4e86\u4ee3\u7801\u7684const\u6b63\u786e\u6027\u3002<\/li>\n<li>\u53ef\u8bfb\u6027&#xff1a;\u660e\u786e\u6807\u8bc6\u54ea\u4e9b\u51fd\u6570\u662f\u53ea\u8bfb\u7684&#xff0c;\u4fbf\u4e8e\u7ef4\u62a4\u3002<\/li>\n<\/ul>\n<p>\u8bed\u6cd5<br \/>\n\u5728\u51fd\u6570\u58f0\u660e\u548c\u5b9a\u4e49\u4e2d&#xff0c;\u5728\u53c2\u6570\u5217\u8868\u540e\u6dfb\u52a0const\u5173\u952e\u5b57\u3002\u683c\u5f0f\u5982\u4e0b&#xff1a;<\/p>\n<p>\u8fd4\u56de\u7c7b\u578b \u51fd\u6570\u540d(\u53c2\u6570\u5217\u8868) const;<\/p>\n<p>\u4f8b\u5982&#xff1a;<\/p>\n<p>class MyClass {<br \/>\npublic:<br \/>\n    void display() const; \/\/ const\u6210\u5458\u51fd\u6570\u58f0\u660e<br \/>\n};<\/p>\n<p>void MyClass::display() const { \/\/ \u5b9a\u4e49<br \/>\n    \/\/ \u51fd\u6570\u4f53<br \/>\n}<\/p>\n<p>\u793a\u4f8b\u4ee3\u7801<br \/>\n\u4ee5\u4e0b\u793a\u4f8b\u5c55\u793a\u4e86\u4e00\u4e2a\u7b80\u5355\u7684\u7c7b&#xff0c;\u5176\u4e2d\u5305\u542bconst\u6210\u5458\u51fd\u6570\u548c\u975econst\u6210\u5458\u51fd\u6570&#xff0c;\u4ee5\u53ca\u5982\u4f55\u5728const\u5bf9\u8c61\u4e0a\u4f7f\u7528\u5b83\u4eec\u3002<\/p>\n<p>#include &lt;iostream&gt;<br \/>\nusing namespace std;<\/p>\n<p>class Counter {<br \/>\nprivate:<br \/>\n    int count;<br \/>\npublic:<br \/>\n    Counter() : count(0) {} \/\/ \u6784\u9020\u51fd\u6570<\/p>\n<p>    \/\/ \u975econst\u6210\u5458\u51fd\u6570&#xff0c;\u4fee\u6539\u6210\u5458\u53d8\u91cf<br \/>\n    void increment() {<br \/>\n        count&#043;&#043;;<br \/>\n    }<\/p>\n<p>    \/\/ const\u6210\u5458\u51fd\u6570&#xff0c;\u53ea\u8bfb\u8bbf\u95ee<br \/>\n    int getCount() const {<br \/>\n        return count; \/\/ \u4e0d\u4fee\u6539count<br \/>\n    }<br \/>\n};<\/p>\n<p>int main() {<br \/>\n    Counter c1;<br \/>\n    c1.increment(); \/\/ \u6b63\u786e\u8c03\u7528\u975econst\u51fd\u6570<br \/>\n    cout &lt;&lt; &#034;Count: &#034; &lt;&lt; c1.getCount() &lt;&lt; endl; \/\/ \u8f93\u51fa: Count: 1<\/p>\n<p>    const Counter c2; \/\/ const\u5bf9\u8c61<br \/>\n    \/\/ c2.increment(); \/\/ \u9519\u8bef&#xff1a;\u4e0d\u80fd\u5728const\u5bf9\u8c61\u4e0a\u8c03\u7528\u975econst\u51fd\u6570<br \/>\n    cout &lt;&lt; &#034;Count: &#034; &lt;&lt; c2.getCount() &lt;&lt; endl; \/\/ \u6b63\u786e&#xff1a;\u8c03\u7528const\u51fd\u6570&#xff0c;\u8f93\u51fa: Count: 0<br \/>\n    return 0;<br \/>\n}<\/p>\n<p>\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d&#xff1a;<\/p>\n<ul>\n<li>getCount() \u662fconst\u6210\u5458\u51fd\u6570&#xff0c;\u53ef\u4ee5\u5728const\u5bf9\u8c61c2\u4e0a\u8c03\u7528\u3002<\/li>\n<li>increment() \u4e0d\u662fconst\u51fd\u6570&#xff0c;\u5728c2\u4e0a\u8c03\u7528\u4f1a\u7f16\u8bd1\u9519\u8bef\u3002<\/li>\n<\/ul>\n<p>\u6ce8\u610f\u4e8b\u9879<\/p>\n<ul>\n<li>\u5982\u679cconst\u6210\u5458\u51fd\u6570\u5c1d\u8bd5\u4fee\u6539\u6210\u5458\u53d8\u91cf&#xff08;\u9664\u975emutable&#xff09;&#xff0c;\u7f16\u8bd1\u5668\u4f1a\u62a5\u9519\u3002<\/li>\n<li>\u5728\u91cd\u8f7d\u51fd\u6570\u65f6&#xff0c;const\u548c\u975econst\u7248\u672c\u53ef\u4ee5\u5171\u5b58&#xff0c;\u7f16\u8bd1\u5668\u6839\u636e\u5bf9\u8c61constness\u9009\u62e9\u3002<\/li>\n<\/ul>\n<h5>\u4e8c\u3001\u53d6\u5730\u5740\u8fd0\u7b97\u7b26\u91cd\u8f7d<\/h5>\n<p>\u5b9a\u4e49\u548c\u76ee\u7684<br \/>\n\u53d6\u5730\u5740\u8fd0\u7b97\u7b26\u91cd\u8f7d\u662f\u6307\u91cd\u8f7d\u8fd0\u7b97\u7b26&amp;&#xff0c;\u7528\u4e8e\u81ea\u5b9a\u4e49\u83b7\u53d6\u5bf9\u8c61\u5730\u5740\u7684\u884c\u4e3a\u3002\u9ed8\u8ba4\u60c5\u51b5\u4e0b&#xff0c;&amp;\u8fd0\u7b97\u7b26\u8fd4\u56de\u5bf9\u8c61\u7684\u6307\u9488\u5730\u5740&#xff0c;\u4f46\u91cd\u8f7d\u540e\u53ef\u4ee5\u5b9e\u73b0\u7279\u5b9a\u903b\u8f91&#xff0c;\u5982\u5728\u667a\u80fd\u6307\u9488\u7c7b\u4e2d\u8fd4\u56de\u5185\u90e8\u6307\u9488\u7684\u5730\u5740\u3002\u8fd9\u589e\u5f3a\u4e86\u7c7b\u7684\u5c01\u88c5\u6027\u548c\u7075\u6d3b\u6027\u3002<\/p>\n<p>\u4e3a\u4ec0\u4e48\u91cd\u8981<\/p>\n<ul>\n<li>\u5c01\u88c5\u6027&#xff1a;\u9690\u85cf\u771f\u5b9e\u5730\u5740\u6216\u63d0\u4f9b\u81ea\u5b9a\u4e49\u5730\u5740\u903b\u8f91&#xff08;\u5982\u4ee3\u7406\u6a21\u5f0f&#xff09;\u3002<\/li>\n<li>\u5b89\u5168\u6027&#xff1a;\u9632\u6b62\u76f4\u63a5\u8bbf\u95ee\u539f\u59cb\u6307\u9488&#xff0c;\u51cf\u5c11\u5185\u5b58\u9519\u8bef\u3002<\/li>\n<li>\u6269\u5c55\u6027&#xff1a;\u5728\u590d\u6742\u7c7b&#xff08;\u5982\u5de5\u5382\u6a21\u5f0f\u6216\u5355\u4f8b&#xff09;\u4e2d\u63a7\u5236\u5730\u5740\u83b7\u53d6\u3002<\/li>\n<\/ul>\n<p>\u8bed\u6cd5<br \/>\n\u8fd0\u7b97\u7b26\u91cd\u8f7d\u7684\u8bed\u6cd5\u662f\u5b9a\u4e49\u4e00\u4e2a\u540d\u4e3aoperator&amp;\u7684\u6210\u5458\u51fd\u6570\u3002\u5b83\u53ef\u4ee5\u8fd4\u56de\u4efb\u4f55\u7c7b\u578b&#xff0c;\u4f46\u901a\u5e38\u8fd4\u56deT*\u6216const T*\u3002\u683c\u5f0f\u5982\u4e0b&#xff1a;<\/p>\n<p>\u8fd4\u56de\u7c7b\u578b operator&amp;();<\/p>\n<p>\u6216<\/p>\n<p>\u8fd4\u56de\u7c7b\u578b operator&amp;() const; \/\/ const\u7248\u672c<\/p>\n<p>\u4f8b\u5982&#xff1a;<\/p>\n<p>class MyClass {<br \/>\npublic:<br \/>\n    MyClass* operator&amp;() {<br \/>\n        return this; \/\/ \u9ed8\u8ba4\u884c\u4e3a&#xff0c;\u8fd4\u56dethis\u6307\u9488<br \/>\n    }<br \/>\n};<\/p>\n<p>\u793a\u4f8b\u4ee3\u7801<br \/>\n\u4ee5\u4e0b\u793a\u4f8b\u5c55\u793a\u4e86\u4e00\u4e2a\u7c7b\u91cd\u8f7d\u53d6\u5730\u5740\u8fd0\u7b97\u7b26&#xff0c;\u7528\u4e8e\u8fd4\u56de\u81ea\u5b9a\u4e49\u5730\u5740\u6216\u65e5\u5fd7\u8bb0\u5f55\u3002<\/p>\n<p>#include &lt;iostream&gt;<br \/>\nusing namespace std;<\/p>\n<p>class AddressLogger {<br \/>\nprivate:<br \/>\n    int data;<br \/>\npublic:<br \/>\n    AddressLogger(int d) : data(d) {}<\/p>\n<p>    \/\/ \u91cd\u8f7d\u53d6\u5730\u5740\u8fd0\u7b97\u7b26&#xff0c;\u8fd4\u56de\u6307\u9488\u5e76\u6253\u5370\u65e5\u5fd7<br \/>\n    AddressLogger* operator&amp;() {<br \/>\n        cout &lt;&lt; &#034;Address operator called. Returning pointer.&#034; &lt;&lt; endl;<br \/>\n        return this; \/\/ \u8fd4\u56de\u5f53\u524d\u5bf9\u8c61\u7684\u5730\u5740<br \/>\n    }<\/p>\n<p>    \/\/ const\u7248\u672c&#xff0c;\u5904\u7406const\u5bf9\u8c61<br \/>\n    const AddressLogger* operator&amp;() const {<br \/>\n        cout &lt;&lt; &#034;Const address operator called.&#034; &lt;&lt; endl;<br \/>\n        return this;<br \/>\n    }<br \/>\n};<\/p>\n<p>int main() {<br \/>\n    AddressLogger obj(10);<br \/>\n    AddressLogger* ptr &#061; &amp;obj; \/\/ \u8c03\u7528\u91cd\u8f7d\u7684operator&amp;<br \/>\n    cout &lt;&lt; &#034;Data via pointer: &#034; &lt;&lt; ptr-&gt;data &lt;&lt; endl; \/\/ \u8f93\u51fa: Data via pointer: 10<\/p>\n<p>    const AddressLogger constObj(20);<br \/>\n    const AddressLogger* constPtr &#061; &amp;constObj; \/\/ \u8c03\u7528const\u7248\u672c\u7684operator&amp;<br \/>\n    cout &lt;&lt; &#034;Const data via pointer: &#034; &lt;&lt; constPtr-&gt;data &lt;&lt; endl; \/\/ \u8f93\u51fa: Const data via pointer: 20<br \/>\n    return 0;<br \/>\n}<\/p>\n<p>\u8f93\u51fa\u793a\u4f8b&#xff1a;<\/p>\n<p>Address operator called. Returning pointer.<br \/>\nData via pointer: 10<br \/>\nConst address operator called.<br \/>\nConst data via pointer: 20<\/p>\n<p>\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d&#xff1a;<\/p>\n<ul>\n<li>\u975econst\u5bf9\u8c61obj\u8c03\u7528\u91cd\u8f7d\u7684operator&amp;&#xff0c;\u6253\u5370\u65e5\u5fd7\u5e76\u8fd4\u56de\u5730\u5740\u3002<\/li>\n<li>const\u5bf9\u8c61constObj\u8c03\u7528const\u7248\u672c\u7684operator&amp;&#xff0c;\u540c\u6837\u6253\u5370\u65e5\u5fd7\u3002<\/li>\n<\/ul>\n<p>\u6ce8\u610f\u4e8b\u9879<\/p>\n<ul>\n<li>\u91cd\u8f7doperator&amp;\u53ef\u80fd\u5f71\u54cd\u9ed8\u8ba4\u884c\u4e3a&#xff0c;\u9700\u8c28\u614e\u4f7f\u7528&#xff0c;\u907f\u514d\u7834\u574f\u6307\u9488\u8bed\u4e49\u3002<\/li>\n<li>\u901a\u5e38\u4e0e\u667a\u80fd\u6307\u9488&#xff08;\u5982std::shared_ptr&#xff09;\u7ed3\u5408&#xff0c;\u4f46\u4e0d\u63a8\u8350\u5728\u666e\u901a\u7c7b\u4e2d\u8fc7\u5ea6\u4f7f\u7528\u3002<\/li>\n<li>\u5982\u679c\u9700\u8981\u8fd4\u56de\u5176\u4ed6\u7c7b\u578b&#xff08;\u5982\u6574\u6570\u5730\u5740&#xff09;&#xff0c;\u786e\u4fdd\u517c\u5bb9\u6027\u3002<\/li>\n<\/ul>\n<h5>\u603b\u7ed3<\/h5>\n<p>\u672c\u7cbe\u8bb2\u8be6\u7ec6\u8bb2\u89e3\u4e86C&#043;&#043;\u4e2d\u7684const\u6210\u5458\u51fd\u6570\u548c\u53d6\u5730\u5740\u8fd0\u7b97\u7b26\u91cd\u8f7d&#xff1a;<\/p>\n<ul>\n<li>const\u6210\u5458\u51fd\u6570&#xff1a;\u7528\u4e8e\u786e\u4fdd\u51fd\u6570\u4e0d\u4fee\u6539\u5bf9\u8c61\u72b6\u6001&#xff0c;\u589e\u5f3a\u4ee3\u7801\u5b89\u5168\u6027\u548cconst\u6b63\u786e\u6027\u3002\u8bed\u6cd5\u7b80\u5355&#xff0c;\u53ea\u9700\u5728\u51fd\u6570\u540e\u6dfb\u52a0const\u3002<\/li>\n<li>\u53d6\u5730\u5740\u8fd0\u7b97\u7b26\u91cd\u8f7d&#xff1a;\u5141\u8bb8\u81ea\u5b9a\u4e49\u83b7\u53d6\u5bf9\u8c61\u5730\u5740\u7684\u903b\u8f91&#xff0c;\u63d0\u5347\u5c01\u88c5\u6027\u548c\u7075\u6d3b\u6027\u3002\u901a\u8fc7\u91cd\u8f7doperator&amp;\u5b9e\u73b0\u3002<\/li>\n<\/ul>\n<p>\u638c\u63e1\u8fd9\u4e9b\u7279\u6027\u80fd\u663e\u8457\u63d0\u5347C&#043;&#043;\u7f16\u7a0b\u6c34\u5e73&#xff0c;\u5efa\u8bae\u5728\u5b9e\u8df5\u4e2d\u591a\u5199\u793a\u4f8b\u4ee3\u7801\u52a0\u6df1\u7406\u89e3\u3002\u7ed3\u5408\u5176\u4ed6\u8fd0\u7b97\u7b26\u91cd\u8f7d\u548cconst\u6982\u5ff5&#xff0c;\u53ef\u4ee5\u6784\u5efa\u66f4\u5065\u58ee\u7684\u7c7b\u8bbe\u8ba1\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>C \u7c7b\u548c\u5bf9\u8c61&#xff08;\u56db&#xff09;&#xff1a;const\u6210\u5458\u51fd\u6570\u3001\u53d6\u5730\u5740\u8fd0\u7b97\u7b26\u91cd\u8f7d\u5168\u7cbe\u8bb2\u5728C\u4e2d&#xff0c;\u7c7b\u548c\u5bf9\u8c61\u662f\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u7684\u6838\u5fc3\u6982\u5ff5\u3002const\u6210\u5458\u51fd\u6570\u548c\u53d6\u5730\u5740\u8fd0\u7b97\u7b26\u91cd\u8f7d\u662f\u4e24\u4e2a\u91cd\u8981\u7684\u9ad8\u7ea7\u7279\u6027&#xff0c;\u7528\u4e8e\u589e\u5f3a\u4ee3\u7801\u7684\u5b89\u5168\u6027\u3001\u7075\u6d3b\u6027\u548c\u53ef\u8bfb\u6027\u3002\u672c\u7cbe\u8bb2\u5c06\u8be6\u7ec6\u89e3\u6790\u8fd9\u4e24\u4e2a\u4e3b\u9898&#xff0c;\u5305\u62ec\u5b9a\u4e49\u3001\u8bed\u6cd5\u3001\u5e94\u7528\u573a\u666f\u548c\u793a\u4f8b\u4ee3\u7801\u3002\u6211\u4eec\u5c06\u5206\u6b65\u8bb2\u89e3&#xff0c;\u786e\u4fdd\u5185\u5bb9\u6e05\u6670\u6613\u61c2\u3002\u4e00\u3001const\u6210\u5458\u51fd\u6570\u5b9a\u4e49\u548c\u76ee\u7684<br \/>\nconst\u6210\u5458\u51fd\u6570\u662f\u6307\u5728\u51fd\u6570\u58f0\u660e\u540e\u6dfb\u52a0const\u5173<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[55,190],"topic":[],"class_list":["post-78759","post","type-post","status-publish","format-standard","hentry","category-server","tag-c","tag-190"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.3 - 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