{"id":3328,"date":"2025-03-29T17:16:19","date_gmt":"2025-03-29T09:16:19","guid":{"rendered":"https:\/\/www.laixuexila.com\/?p=3328"},"modified":"2025-03-29T17:16:19","modified_gmt":"2025-03-29T09:16:19","slug":"c-%e5%91%bd%e5%90%8d%e7%a9%ba%e9%97%b4-namespace","status":"publish","type":"post","link":"https:\/\/www.laixuexila.com\/index.php\/2025\/03\/29\/c-%e5%91%bd%e5%90%8d%e7%a9%ba%e9%97%b4-namespace\/","title":{"rendered":"C++ \u547d\u540d\u7a7a\u95f4 (Namespace)"},"content":{"rendered":"\n<p>\u547d\u540d\u7a7a\u95f4\u662f C++ \u4e2d\u7528\u4e8e\u907f\u514d\u547d\u540d\u51b2\u7a81\u7684\u4e00\u4e2a\u91cd\u8981\u6982\u5ff5\u3002\u5b83\u4e3a\u6807\u8bc6\u7b26\uff08\u5982\u51fd\u6570\u3001\u53d8\u91cf\u3001\u7c7b\u7b49\uff09\u63d0\u4f9b\u4e86\u4e00\u4e2a\u4f5c\u7528\u57df\uff0c\u4ece\u800c\u907f\u514d\u5728\u4e0d\u540c\u7684\u5e93\u6216\u4ee3\u7801\u6a21\u5757\u4e2d\u4f7f\u7528\u76f8\u540c\u540d\u79f0\u7684\u6807\u8bc6\u7b26\u65f6\u4ea7\u751f\u51b2\u7a81\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>1. \u547d\u540d\u7a7a\u95f4\u7684\u5b9a\u4e49<\/strong><\/h3>\n\n\n\n<p>C++ \u4f7f\u7528 <code>namespace<\/code> \u5173\u952e\u5b57\u6765\u5b9a\u4e49\u547d\u540d\u7a7a\u95f4\u3002\u547d\u540d\u7a7a\u95f4\u53ef\u4ee5\u5305\u542b\u591a\u79cd\u7c7b\u578b\u7684\u6807\u8bc6\u7b26\uff0c\u5982\u53d8\u91cf\u3001\u51fd\u6570\u3001\u7c7b\u3001\u5bf9\u8c61\u7b49\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>#include &lt;iostream&gt;\nusing namespace std;\n\nnamespace MyNamespace {\n    int x = 10;\n    void display() {\n        cout &lt;&lt; \"Inside MyNamespace\" &lt;&lt; endl;\n    }\n}\n\nint main() {\n    cout &lt;&lt; MyNamespace::x &lt;&lt; endl;  \/\/ \u8bbf\u95ee\u547d\u540d\u7a7a\u95f4\u4e2d\u7684\u53d8\u91cf\n    MyNamespace::display();  \/\/ \u8bbf\u95ee\u547d\u540d\u7a7a\u95f4\u4e2d\u7684\u51fd\u6570\n    return 0;\n}<\/code><\/pre>\n\n\n\n<p><strong>\u8f93\u51fa\uff1a<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>10\nInside MyNamespace<\/code><\/pre>\n\n\n\n<p><strong>\u8bf4\u660e\uff1a<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>namespace MyNamespace { ... }<\/code>\uff1a\u5b9a\u4e49\u4e86\u4e00\u4e2a\u547d\u540d\u7a7a\u95f4 <code>MyNamespace<\/code>\uff0c\u5176\u4e2d\u5305\u542b\u53d8\u91cf <code>x<\/code> \u548c\u51fd\u6570 <code>display()<\/code>\u3002<\/li>\n\n\n\n<li><code>MyNamespace::x<\/code> \u548c <code>MyNamespace::display()<\/code>\uff1a\u901a\u8fc7 <code>::<\/code> \u64cd\u4f5c\u7b26\u6765\u8bbf\u95ee\u547d\u540d\u7a7a\u95f4\u4e2d\u7684\u6210\u5458\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>2. \u4f7f\u7528 <code>using<\/code> \u58f0\u660e\u6765\u7b80\u5316\u4ee3\u7801<\/strong><\/h3>\n\n\n\n<p>\u5982\u679c\u547d\u540d\u7a7a\u95f4\u4e2d\u7684\u6210\u5458\u88ab\u9891\u7e41\u4f7f\u7528\uff0c\u53ef\u4ee5\u901a\u8fc7 <code>using<\/code> \u58f0\u660e\u7b80\u5316\u8bbf\u95ee\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>#include &lt;iostream&gt;\nusing namespace std;\n\nnamespace MyNamespace {\n    int x = 10;\n    void display() {\n        cout &lt;&lt; \"Inside MyNamespace\" &lt;&lt; endl;\n    }\n}\n\nint main() {\n    using namespace MyNamespace;  \/\/ \u5f15\u5165\u547d\u540d\u7a7a\u95f4\n\n    cout &lt;&lt; x &lt;&lt; endl;  \/\/ \u53ef\u4ee5\u76f4\u63a5\u4f7f\u7528 x\n    display();  \/\/ \u53ef\u4ee5\u76f4\u63a5\u8c03\u7528 display() \u51fd\u6570\n    return 0;\n}<\/code><\/pre>\n\n\n\n<p><strong>\u8f93\u51fa\uff1a<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>10\nInside MyNamespace<\/code><\/pre>\n\n\n\n<p><strong>\u8bf4\u660e\uff1a<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>using namespace MyNamespace;<\/code> \u4f7f\u5f97 <code>main<\/code> \u51fd\u6570\u4e2d\u7684\u4ee3\u7801\u53ef\u4ee5\u76f4\u63a5\u8bbf\u95ee <code>MyNamespace<\/code> \u4e2d\u7684\u6240\u6709\u6210\u5458\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>3. \u89e3\u51b3\u547d\u540d\u51b2\u7a81<\/strong><\/h3>\n\n\n\n<p>\u547d\u540d\u7a7a\u95f4\u6700\u5e38\u89c1\u7684\u7528\u9014\u4e4b\u4e00\u5c31\u662f\u89e3\u51b3\u547d\u540d\u51b2\u7a81\u3002\u5f53\u4e0d\u540c\u7684\u5e93\u6216\u6a21\u5757\u4e2d\u5b9a\u4e49\u4e86\u76f8\u540c\u540d\u5b57\u7684\u6807\u8bc6\u7b26\u65f6\uff0c\u547d\u540d\u7a7a\u95f4\u53ef\u4ee5\u907f\u514d\u8fd9\u4e9b\u51b2\u7a81\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>#include &lt;iostream&gt;\nusing namespace std;\n\nnamespace LibraryA {\n    void func() {\n        cout &lt;&lt; \"LibraryA function\" &lt;&lt; endl;\n    }\n}\n\nnamespace LibraryB {\n    void func() {\n        cout &lt;&lt; \"LibraryB function\" &lt;&lt; endl;\n    }\n}\n\nint main() {\n    LibraryA::func();  \/\/ \u8c03\u7528 LibraryA \u7684\u51fd\u6570\n    LibraryB::func();  \/\/ \u8c03\u7528 LibraryB \u7684\u51fd\u6570\n    return 0;\n}<\/code><\/pre>\n\n\n\n<p><strong>\u8f93\u51fa\uff1a<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>LibraryA function\nLibraryB function<\/code><\/pre>\n\n\n\n<p><strong>\u8bf4\u660e\uff1a<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>LibraryA::func()<\/code> \u548c <code>LibraryB::func()<\/code> \u901a\u8fc7\u547d\u540d\u7a7a\u95f4\u6765\u533a\u5206\u540c\u540d\u7684 <code>func()<\/code> \u51fd\u6570\uff0c\u907f\u514d\u547d\u540d\u51b2\u7a81\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>4. \u547d\u540d\u7a7a\u95f4\u5d4c\u5957<\/strong><\/h3>\n\n\n\n<p>\u547d\u540d\u7a7a\u95f4\u4e5f\u53ef\u4ee5\u5d4c\u5957\u4f7f\u7528\uff0c\u5373\u5728\u4e00\u4e2a\u547d\u540d\u7a7a\u95f4\u4e2d\u5b9a\u4e49\u53e6\u4e00\u4e2a\u547d\u540d\u7a7a\u95f4\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>#include &lt;iostream&gt;\nusing namespace std;\n\nnamespace OuterNamespace {\n    int outerValue = 10;\n\n    namespace InnerNamespace {\n        int innerValue = 20;\n    }\n}\n\nint main() {\n    cout &lt;&lt; OuterNamespace::outerValue &lt;&lt; endl;  \/\/ \u8bbf\u95ee\u5916\u90e8\u547d\u540d\u7a7a\u95f4\n    cout &lt;&lt; OuterNamespace::InnerNamespace::innerValue &lt;&lt; endl;  \/\/ \u8bbf\u95ee\u5d4c\u5957\u547d\u540d\u7a7a\u95f4\n    return 0;\n}<\/code><\/pre>\n\n\n\n<p><strong>\u8f93\u51fa\uff1a<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>10\n20<\/code><\/pre>\n\n\n\n<p><strong>\u8bf4\u660e\uff1a<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>OuterNamespace::InnerNamespace::innerValue<\/code> \u901a\u8fc7\u591a\u7ea7\u547d\u540d\u7a7a\u95f4\u6765\u8bbf\u95ee\u5d4c\u5957\u7684\u6210\u5458\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>5. \u533f\u540d\u547d\u540d\u7a7a\u95f4<\/strong><\/h3>\n\n\n\n<p>C++ \u5141\u8bb8\u5b9a\u4e49\u533f\u540d\u547d\u540d\u7a7a\u95f4\uff08\u6ca1\u6709\u540d\u5b57\u7684\u547d\u540d\u7a7a\u95f4\uff09\u3002\u5b83\u901a\u5e38\u7528\u4e8e\u9650\u5236\u4f5c\u7528\u57df\u5185\u7684\u6807\u8bc6\u7b26\uff0c\u4f7f\u5b83\u4eec\u53ea\u80fd\u5728\u5f53\u524d\u6587\u4ef6\u4e2d\u4f7f\u7528\uff0c\u9632\u6b62\u5176\u4ed6\u6587\u4ef6\u8bbf\u95ee\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>#include &lt;iostream&gt;\nusing namespace std;\n\nnamespace {\n    int secretValue = 42;  \/\/ \u533f\u540d\u547d\u540d\u7a7a\u95f4\n}\n\nint main() {\n    cout &lt;&lt; secretValue &lt;&lt; endl;  \/\/ \u53ea\u5728\u5f53\u524d\u6587\u4ef6\u4e2d\u53ef\u89c1\n    return 0;\n}<\/code><\/pre>\n\n\n\n<p><strong>\u8f93\u51fa\uff1a<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>42<\/code><\/pre>\n\n\n\n<p><strong>\u8bf4\u660e\uff1a<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u533f\u540d\u547d\u540d\u7a7a\u95f4\u5185\u7684\u6807\u8bc6\u7b26\uff08\u5982 <code>secretValue<\/code>\uff09\u662f\u552f\u4e00\u7684\uff0c\u4ec5\u5728\u5f53\u524d\u6e90\u6587\u4ef6\u4e2d\u6709\u6548\uff0c\u4e0d\u80fd\u88ab\u5176\u4ed6\u6587\u4ef6\u8bbf\u95ee\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>6. \u547d\u540d\u7a7a\u95f4\u7684 <code>inline<\/code> \u5173\u952e\u5b57<\/strong><\/h3>\n\n\n\n<p><code>inline<\/code> \u547d\u540d\u7a7a\u95f4\u7528\u4e8e\u6307\u5b9a\u547d\u540d\u7a7a\u95f4\u4e2d\u7684\u6210\u5458\u5e94\u8be5\u4f5c\u4e3a\u5185\u8054\u4ee3\u7801\u5904\u7406\uff0c\u901a\u5e38\u7528\u4e8e\u7248\u672c\u7ba1\u7406\uff0c\u5141\u8bb8\u591a\u4e2a\u7248\u672c\u7684\u529f\u80fd\u5171\u5b58\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>#include &lt;iostream&gt;\nusing namespace std;\n\nnamespace V1 {\n    void print() {\n        cout &lt;&lt; \"Version 1\" &lt;&lt; endl;\n    }\n}\n\ninline namespace V2 {\n    void print() {\n        cout &lt;&lt; \"Version 2\" &lt;&lt; endl;\n    }\n}\n\nint main() {\n    print();  \/\/ \u8c03\u7528 V2 \u7684 print \u51fd\u6570\n    return 0;\n}<\/code><\/pre>\n\n\n\n<p><strong>\u8f93\u51fa\uff1a<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Version 2<\/code><\/pre>\n\n\n\n<p><strong>\u8bf4\u660e\uff1a<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>inline namespace V2 { ... }<\/code> \u4f7f\u5f97 <code>V2<\/code> \u547d\u540d\u7a7a\u95f4\u5185\u7684\u6210\u5458\u53ef\u4ee5\u76f4\u63a5\u88ab\u8bbf\u95ee\uff0c\u5c31\u50cf\u5b83\u662f <code>V1<\/code> \u7684\u4e00\u90e8\u5206\u4e00\u6837\u3002\u8fd9\u5728\u7248\u672c\u63a7\u5236\u4e2d\u975e\u5e38\u6709\u7528\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>7. \u547d\u540d\u7a7a\u95f4\u7684\u7528\u6cd5\u603b\u7ed3<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u907f\u514d\u547d\u540d\u51b2\u7a81<\/strong>\uff1a\u547d\u540d\u7a7a\u95f4\u53ef\u4ee5\u9632\u6b62\u591a\u4e2a\u5e93\u6216\u6a21\u5757\u4e2d\u7684\u6807\u8bc6\u7b26\u51b2\u7a81\u3002<\/li>\n\n\n\n<li><strong>\u7b80\u5316\u4ee3\u7801<\/strong>\uff1a\u901a\u8fc7 <code>using namespace<\/code> \u53ef\u4ee5\u7b80\u5316\u8bbf\u95ee\u547d\u540d\u7a7a\u95f4\u4e2d\u7684\u6210\u5458\u3002<\/li>\n\n\n\n<li><strong>\u591a\u7ea7\u547d\u540d\u7a7a\u95f4<\/strong>\uff1a\u53ef\u4ee5\u5728\u547d\u540d\u7a7a\u95f4\u4e2d\u5d4c\u5957\u5176\u4ed6\u547d\u540d\u7a7a\u95f4\u3002<\/li>\n\n\n\n<li><strong>\u533f\u540d\u547d\u540d\u7a7a\u95f4<\/strong>\uff1a\u4e3a\u53ea\u5728\u5f53\u524d\u6e90\u6587\u4ef6\u6709\u6548\u7684\u6807\u8bc6\u7b26\u63d0\u4f9b\u4f5c\u7528\u57df\u3002<\/li>\n\n\n\n<li><strong>\u547d\u540d\u7a7a\u95f4\u7279\u6027<\/strong>\uff1a<code>inline<\/code> \u547d\u540d\u7a7a\u95f4\u53ef\u7528\u4e8e\u7248\u672c\u7ba1\u7406\u7b49\u573a\u666f\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>8. \u5c0f\u7ed3<\/strong><\/h3>\n\n\n\n<p>C++ \u7684\u547d\u540d\u7a7a\u95f4\u673a\u5236\u662f\u7ba1\u7406\u5927\u578b\u4ee3\u7801\u5e93\u548c\u907f\u514d\u547d\u540d\u51b2\u7a81\u7684\u6709\u6548\u624b\u6bb5\u3002\u901a\u8fc7\u5408\u7406\u4f7f\u7528\u547d\u540d\u7a7a\u95f4\uff0c\u6211\u4eec\u53ef\u4ee5\u786e\u4fdd\u4ee3\u7801\u7684\u53ef\u7ef4\u62a4\u6027\u548c\u6269\u5c55\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u547d\u540d\u7a7a\u95f4\u662f C++ \u4e2d\u7528\u4e8e\u907f\u514d\u547d\u540d\u51b2\u7a81\u7684\u4e00\u4e2a\u91cd\u8981\u6982\u5ff5\u3002\u5b83\u4e3a\u6807\u8bc6\u7b26\uff08\u5982\u51fd\u6570\u3001\u53d8\u91cf\u3001\u7c7b\u7b49\uff09\u63d0\u4f9b\u4e86\u4e00\u4e2a\u4f5c\u7528\u57df\uff0c\u4ece\u800c\u907f [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":3329,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[81],"tags":[],"class_list":["post-3328","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-c-"],"_links":{"self":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/3328","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/comments?post=3328"}],"version-history":[{"count":1,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/3328\/revisions"}],"predecessor-version":[{"id":3330,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/3328\/revisions\/3330"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media\/3329"}],"wp:attachment":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media?parent=3328"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/categories?post=3328"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/tags?post=3328"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}