{"id":112928,"date":"2026-10-05T08:41:06","date_gmt":"2026-10-05T00:41:06","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/112928.html"},"modified":"2026-10-05T08:41:06","modified_gmt":"2026-10-05T00:41:06","slug":"%e6%b7%b1%e5%85%a5%e7%90%86%e8%a7%a3c-%e9%87%8d%e8%bd%bd-%ef%bc%9c%e4%ba%8c%e5%8d%81%ef%bc%9e%e8%bf%90%e7%ae%97%e7%ac%a6","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/112928.html","title":{"rendered":"\u6df1\u5165\u7406\u89e3C++ \u91cd\u8f7d \uff1c\u4e8c\u5341\uff1e==\u8fd0\u7b97\u7b26"},"content":{"rendered":"<p>\u5728 C&#043;&#043; \u4e2d&#xff0c;&#061;&#061;&#xff08;\u76f8\u7b49\u6bd4\u8f83\u8fd0\u7b97\u7b26&#xff09;\u662f\u4f7f\u7528\u9891\u7387\u6700\u9ad8\u7684\u8fd0\u7b97\u7b26\u4e4b\u4e00\u3002\u91cd\u8f7d\u5b83\u53ef\u4ee5\u8ba9\u81ea\u5b9a\u4e49\u7c7b\u578b\u50cf\u5185\u7f6e\u7c7b\u578b\u4e00\u6837\u8fdb\u884c\u76f8\u7b49\u6027\u5224\u65ad\u3002\u4e0e || \u4e0d\u540c&#xff0c;&#061;&#061; \u7684\u91cd\u8f7d\u975e\u5e38\u5e38\u89c1\u4e14\u63a8\u8350&#xff0c;\u4f46\u4e5f\u6709\u4e00\u4e9b\u9700\u8981\u6ce8\u610f\u7684\u89c4\u5219\u548c\u9677\u9631\u3002<\/p>\n<p>\u4e0b\u9762\u8be6\u7ec6\u4ecb\u7ecd &#061;&#061; \u7684\u91cd\u8f7d\u65b9\u5f0f\u3001\u89c4\u5219\u3001\u6ce8\u610f\u4e8b\u9879&#xff0c;\u5e76\u7ed9\u51fa\u7b80\u5355\u53ef\u8fd0\u884c\u7684\u4f8b\u5b50\u3002<\/p>\n<hr \/>\n<h3>1. \u91cd\u8f7d\u5f62\u5f0f<\/h3>\n<p>&#061;&#061; \u662f\u4e8c\u5143\u8fd0\u7b97\u7b26&#xff0c;\u53ef\u4ee5\u91cd\u8f7d\u4e3a\u6210\u5458\u51fd\u6570\u6216\u975e\u6210\u5458\u51fd\u6570\u3002<\/p>\n<h4>\u6210\u5458\u51fd\u6570<\/h4>\n<p>cpp<\/p>\n<p>class X {<br \/>\npublic:<br \/>\n    bool operator&#061;&#061;(const X&amp; rhs) const;<br \/>\n};<\/p>\n<p>\u4f7f\u7528\u65f6&#xff1a;<\/p>\n<p>cpp<\/p>\n<p>X a, b;<br \/>\na &#061;&#061; b;   \/\/ \u7b49\u4ef7\u4e8e a.operator&#061;&#061;(b)<\/p>\n<h4>\u975e\u6210\u5458\u51fd\u6570<\/h4>\n<p>cpp<\/p>\n<p>bool operator&#061;&#061;(const X&amp; lhs, const X&amp; rhs);<\/p>\n<p>\u4f7f\u7528\u65f6&#xff1a;<\/p>\n<p>cpp<\/p>\n<p>X a, b;<br \/>\na &#061;&#061; b;   \/\/ \u7b49\u4ef7\u4e8e operator&#061;&#061;(a, b)<\/p>\n<p>\u63a8\u8350\u4f7f\u7528\u975e\u6210\u5458\u51fd\u6570&#xff0c;\u56e0\u4e3a\u8fd9\u6837\u53ef\u4ee5\u4fdd\u8bc1\u5de6\u53f3\u64cd\u4f5c\u6570\u5bf9\u79f0&#xff0c;\u5e76\u5141\u8bb8\u9690\u5f0f\u8f6c\u6362\u540c\u65f6\u4f5c\u7528\u4e8e\u4e24\u4fa7\u3002<\/p>\n<hr \/>\n<h3>2. \u57fa\u672c\u89c4\u5219<\/h3>\n<ul>\n<li>\n<p>\u4e0d\u80fd\u91cd\u8f7d\u4e24\u4e2a\u5185\u7f6e\u7c7b\u578b\u4e4b\u95f4\u7684 &#061;&#061;&#xff0c;\u4f8b\u5982 bool operator&#061;&#061;(int, int) \u662f\u975e\u6cd5\u7684\u3002<\/p>\n<\/li>\n<li>\n<p>\u81f3\u5c11\u6709\u4e00\u4e2a\u64cd\u4f5c\u6570\u5fc5\u987b\u662f\u7c7b\u7c7b\u578b\u6216\u679a\u4e3e\u7c7b\u578b\u3002<\/p>\n<\/li>\n<li>\n<p>\u4e0d\u80fd\u6539\u53d8 &#061;&#061; \u7684\u64cd\u4f5c\u6570\u4e2a\u6570\u3001\u4f18\u5148\u7ea7\u548c\u7ed3\u5408\u6027\u3002&#061;&#061; \u662f\u4e8c\u5143\u8fd0\u7b97\u7b26&#xff0c;\u5de6\u7ed3\u5408&#xff0c;\u4f18\u5148\u7ea7\u9ad8\u4e8e &amp;&amp;\u3001||&#xff0c;\u4f4e\u4e8e\u5173\u7cfb\u8fd0\u7b97\u7b26\u3002<\/p>\n<\/li>\n<li>\n<p>\u8fd4\u56de\u7c7b\u578b\u901a\u5e38\u4e3a bool&#xff0c;\u4f46 C&#043;&#043;20 \u8d77\u5141\u8bb8\u8fd4\u56de\u5176\u4ed6\u7c7b\u578b&#xff08;\u4f8b\u5982\u7528\u4e8e\u4ee3\u7406\u5bf9\u8c61&#xff09;&#xff0c;\u4e0d\u8fc7\u7edd\u5927\u591a\u6570\u60c5\u51b5\u4ecd\u5e94\u8fd4\u56de bool\u3002<\/p>\n<\/li>\n<li>\n<p>\u91cd\u8f7d &#061;&#061; \u540e&#xff0c;a &#061;&#061; b \u4f1a\u8c03\u7528\u4f60\u7684\u51fd\u6570&#xff0c;\u800c\u4e0d\u662f\u5185\u7f6e\u6bd4\u8f83\u3002<\/p>\n<\/li>\n<li>\n<p>\u6210\u5458\u51fd\u6570\u7248\u672c\u5e94\u58f0\u660e\u4e3a const&#xff0c;\u56e0\u4e3a\u5b83\u4e0d\u4fee\u6539\u5bf9\u8c61\u3002<\/p>\n<\/li>\n<\/ul>\n<hr \/>\n<h3>3. \u4e0e !&#061; \u7684\u5173\u7cfb<\/h3>\n<p>\u5728 C&#043;&#043;20 \u4e4b\u524d&#xff0c;\u91cd\u8f7d\u4e86 &#061;&#061; \u4e0d\u4f1a\u81ea\u52a8\u83b7\u5f97 !&#061;\u3002\u4f60\u5fc5\u987b\u624b\u52a8\u91cd\u8f7d !&#061;&#xff0c;\u901a\u5e38\u5b9e\u73b0\u4e3a&#xff1a;<\/p>\n<p>cpp<\/p>\n<p>bool operator!&#061;(const X&amp; lhs, const X&amp; rhs) {<br \/>\n    return !(lhs &#061;&#061; rhs);<br \/>\n}<\/p>\n<p>\u4ece C&#043;&#043;20 \u5f00\u59cb&#xff0c;\u5982\u679c\u91cd\u8f7d\u4e86 &#061;&#061;&#xff0c;\u7f16\u8bd1\u5668\u53ef\u4ee5\u81ea\u52a8\u751f\u6210 !&#061;&#xff0c;\u5176\u8bed\u4e49\u4e3a !(a &#061;&#061; b)\u3002\u8fd9\u79f0\u4e3a\u201c\u91cd\u5199\u89c4\u5219\u201d\u3002\u56e0\u6b64 C&#043;&#043;20 \u540e\u901a\u5e38\u53ea\u9700\u5b9a\u4e49 &#061;&#061;\u3002<\/p>\n<hr \/>\n<h3>4. C&#043;&#043;20 \u7684\u4e09\u8def\u6bd4\u8f83\u4e0e\u9ed8\u8ba4\u6bd4\u8f83<\/h3>\n<p>C&#043;&#043;20 \u5f15\u5165\u4e86 operator&lt;&#061;&gt;&#xff08;\u4e09\u8def\u6bd4\u8f83&#xff09;&#xff0c;\u5e76\u4e14\u5141\u8bb8\u7528 &#061; default \u8ba9\u7f16\u8bd1\u5668\u81ea\u52a8\u751f\u6210 &#061;&#061; \u548c &lt;&#061;&gt;\u3002<\/p>\n<h4>\u4f7f\u7528 &#061; default \u81ea\u52a8\u751f\u6210 &#061;&#061;<\/h4>\n<p>cpp<\/p>\n<p>class Point {<br \/>\n    int x_, y_;<br \/>\npublic:<br \/>\n    Point(int x, int y) : x_(x), y_(y) {}<\/p>\n<p>    bool operator&#061;&#061;(const Point&amp;) const &#061; default;<br \/>\n};<\/p>\n<p>\u7f16\u8bd1\u5668\u4f1a\u9010\u6210\u5458\u6bd4\u8f83&#xff0c;\u751f\u6210\u6b63\u786e\u7684 &#061;&#061; \u548c !&#061;\u3002<\/p>\n<h4>\u4f7f\u7528 &lt;&#061;&gt; \u751f\u6210\u6240\u6709\u6bd4\u8f83<\/h4>\n<p>cpp<\/p>\n<p>#include &lt;compare&gt;<\/p>\n<p>class Point {<br \/>\n    int x_, y_;<br \/>\npublic:<br \/>\n    Point(int x, int y) : x_(x), y_(y) {}<\/p>\n<p>    auto operator&lt;&#061;&gt;(const Point&amp;) const &#061; default;<br \/>\n};<\/p>\n<p>\u8fd9\u4f1a\u81ea\u52a8\u751f\u6210 &#061;&#061;\u3001!&#061;\u3001&lt;\u3001&lt;&#061;\u3001&gt;\u3001&gt;&#061;\u3002<\/p>\n<hr \/>\n<h3>5. \u6ce8\u610f\u4e8b\u9879<\/h3>\n<li>\n<p>\u5bf9\u79f0\u6027&#xff1a;a &#061;&#061; b \u548c b &#061;&#061; a \u5e94\u8be5\u5f97\u5230\u76f8\u540c\u7ed3\u679c\u3002\u975e\u6210\u5458\u51fd\u6570\u66f4\u5bb9\u6613\u4fdd\u8bc1\u8fd9\u4e00\u70b9\u3002<\/p>\n<\/li>\n<li>\n<p>\u9690\u5f0f\u8f6c\u6362&#xff1a;\u5982\u679c\u7c7b\u6709\u9690\u5f0f\u8f6c\u6362\u6784\u9020\u51fd\u6570&#xff0c;\u6210\u5458\u51fd\u6570\u7248\u672c\u53ef\u80fd\u5bfc\u81f4 a &#061;&#061; b \u548c b &#061;&#061; a \u884c\u4e3a\u4e0d\u540c\u3002C&#043;&#043;20 \u7684\u91cd\u5199\u89c4\u5219\u53ef\u4ee5\u7f13\u89e3\u3002<\/p>\n<\/li>\n<li>\n<p>const \u6b63\u786e\u6027&#xff1a;\u6210\u5458\u51fd\u6570\u5e94\u58f0\u660e\u4e3a const&#xff0c;\u5426\u5219\u65e0\u6cd5\u6bd4\u8f83 const \u5bf9\u8c61\u3002<\/p>\n<\/li>\n<li>\n<p>noexcept&#xff1a;\u5982\u679c\u6bd4\u8f83\u4e0d\u4f1a\u629b\u5f02\u5e38&#xff0c;\u53ef\u4ee5\u6807\u8bb0 noexcept&#xff0c;\u6709\u52a9\u4e8e\u4f18\u5316\u3002<\/p>\n<\/li>\n<li>\n<p>\u6027\u80fd&#xff1a;\u6bd4\u8f83\u53ef\u80fd\u6d89\u53ca\u591a\u4e2a\u6210\u5458&#xff0c;\u53ef\u4ee5\u5148\u6bd4\u8f83\u6700\u53ef\u80fd\u4e0d\u540c\u7684\u6210\u5458&#xff0c;\u6216\u4f7f\u7528 std::tie \u7b80\u5316\u3002<\/p>\n<\/li>\n<li>\n<p>\u6d6e\u70b9\u6570\u6bd4\u8f83&#xff1a;\u5982\u679c\u7c7b\u5305\u542b\u6d6e\u70b9\u6570&#xff0c;\u76f4\u63a5 &#061;&#061; \u53ef\u80fd\u56e0\u7cbe\u5ea6\u95ee\u9898\u4e0d\u51c6\u786e&#xff0c;\u9700\u8c28\u614e\u3002<\/p>\n<\/li>\n<li>\n<p>\u4e0d\u8981\u4e0e\u8d4b\u503c &#061; \u6df7\u6dc6&#xff1a;&#061;&#061; \u662f\u6bd4\u8f83&#xff0c;&#061; \u662f\u8d4b\u503c\u3002<\/p>\n<\/li>\n<li>\n<p>\u7ee7\u627f\u4e0e\u591a\u6001&#xff1a;\u5982\u679c\u7c7b\u6709\u865a\u51fd\u6570&#xff0c;&#061;&#061; \u901a\u5e38\u4e0d\u5e94\u6bd4\u8f83\u52a8\u6001\u7c7b\u578b&#xff0c;\u9664\u975e\u660e\u786e\u9700\u8981\u3002<\/p>\n<\/li>\n<p>#include &lt;iostream&gt;<\/p>\n<p>class Point {<br \/>\nprivate:<br \/>\n    int x_;<br \/>\n    int y_;<\/p>\n<p>public:<br \/>\n    Point(int x, int y) : x_(x), y_(y) {}<\/p>\n<p>    \/\/ \u6210\u5458\u51fd\u6570\u91cd\u8f7d &#061;&#061;<br \/>\n    bool operator&#061;&#061;(const Point&amp; other) const {<br \/>\n        std::cout &lt;&lt; &#034;\u8c03\u7528\u6210\u5458 operator&#061;&#061;\\\\n&#034;;<br \/>\n        return x_ &#061;&#061; other.x_ &amp;&amp; y_ &#061;&#061; other.y_;<br \/>\n    }<\/p>\n<p>    \/\/ C&#043;&#043;17 \u9700\u8981\u624b\u52a8\u91cd\u8f7d !&#061;<br \/>\n    bool operator!&#061;(const Point&amp; other) const {<br \/>\n        std::cout &lt;&lt; &#034;\u8c03\u7528\u6210\u5458 operator!&#061;\\\\n&#034;;<br \/>\n        return !(*this &#061;&#061; other);<br \/>\n    }<\/p>\n<p>    int x() const { return x_; }<br \/>\n    int y() const { return y_; }<br \/>\n};<\/p>\n<p>int main() {<br \/>\n    Point p1(1, 2);<br \/>\n    Point p2(1, 2);<br \/>\n    Point p3(3, 4);<\/p>\n<p>    std::cout &lt;&lt; std::boolalpha;<br \/>\n    std::cout &lt;&lt; &#034;p1 &#061;&#061; p2: &#034; &lt;&lt; (p1 &#061;&#061; p2) &lt;&lt; &#039;\\\\n&#039;;<br \/>\n    std::cout &lt;&lt; &#034;p1 &#061;&#061; p3: &#034; &lt;&lt; (p1 &#061;&#061; p3) &lt;&lt; &#039;\\\\n&#039;;<br \/>\n    std::cout &lt;&lt; &#034;p1 !&#061; p2: &#034; &lt;&lt; (p1 !&#061; p2) &lt;&lt; &#039;\\\\n&#039;;<br \/>\n    std::cout &lt;&lt; &#034;p1 !&#061; p3: &#034; &lt;&lt; (p1 !&#061; p3) &lt;&lt; &#039;\\\\n&#039;;<\/p>\n<p>    return 0;<br \/>\n}<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728 C \u4e2d&#xff0c;&#xff08;\u76f8\u7b49\u6bd4\u8f83\u8fd0\u7b97\u7b26&#xff09;\u662f\u4f7f\u7528\u9891\u7387\u6700\u9ad8\u7684\u8fd0\u7b97\u7b26\u4e4b\u4e00\u3002\u91cd\u8f7d\u5b83\u53ef\u4ee5\u8ba9\u81ea\u5b9a\u4e49\u7c7b\u578b\u50cf\u5185\u7f6e\u7c7b\u578b\u4e00\u6837\u8fdb\u884c\u76f8\u7b49\u6027\u5224\u65ad\u3002\u4e0e || \u4e0d\u540c&#xff0c; 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