{"id":740,"date":"2025-05-09T10:21:52","date_gmt":"2025-05-09T02:21:52","guid":{"rendered":"https:\/\/www.notown.top\/?p=740"},"modified":"2025-05-21T21:46:15","modified_gmt":"2025-05-21T13:46:15","slug":"%e5%8d%95%e4%b8%80%e8%81%8c%e8%b4%a3%e6%a8%a1%e5%bc%8f%ef%bc%88%e8%a3%85%e9%a5%b0%e5%99%a8%e3%80%81%e6%a1%a5%ef%bc%89","status":"publish","type":"post","link":"https:\/\/www.notown.top\/?p=740","title":{"rendered":"\u5355\u4e00\u804c\u8d23\u6a21\u5f0f\uff08\u88c5\u9970\u5668\u3001\u6865\uff09"},"content":{"rendered":"<blockquote><p>\n  \u5728\u8f6f\u4ef6\u7ec4\u4ef6\u7684\u8bbe\u8ba1\u4e2d\uff0c\u5982\u679c\u8d23\u4efb\u5212\u5206\u7684\u4e0d\u6e05\u6670\uff0c\u4f7f\u7528\u7ee7\u627f\u5f97\u5230\u7684\u7ed3\u679c\u5f80\u5f80\u662f\u968f\u7740\u9700\u6c42\u7684\u53d8\u5316\uff0c\u5b50\u7c7b\u6025\u5267\u81a8\u80c0\uff0c\u540c\u65f6\u5145\u65a5\u7740\u91cd\u590d\u4ee3\u7801\uff0c\u8fd9\u65f6\u5019\u7684\u5173\u952e\u662f<strong>\u5212\u6e05\u8d23\u4efb\uff0c\u5373\u9075\u5faa\u201c\u5355\u4e00\u804c\u8d23\u201d\u6a21\u5f0f<\/strong>\uff08\u5c5e\u4e8e\u6b64\u6a21\u5f0f\u7684\u6709Decorator\u548cBridge\uff09\u3002\n<\/p><\/blockquote>\n<h2>\u88c5\u9970\u6a21\u5f0f\uff08Decorator\uff09<\/h2>\n<p>\u88c5\u9970\u6a21\u5f0f\u53ef\u4ee5\u89e3\u51b3\u7684\u95ee\u9898\uff1a<br \/>\n&#8211; \u4f7f\u201c\u5bf9\u8c61\u529f\u80fd\u7684\u6269\u5c55\u201d\u80fd\u591f\u6839\u636e\u9700\u8981\u6765\u52a8\u6001\u5730\u5b9e\u73b0<br \/>\n&#8211; \u540c\u65f6\u907f\u514d\u201c\u6269\u5c55\u529f\u80fd\u7684\u589e\u591a\u201d\u5e26\u6765\u7684\u5b50\u7c7b\u81a8\u80c0\u95ee\u9898<br \/>\n&#8211; \u4f7f\u5f97\u4efb\u4f55\u201c\u529f\u80fd\u6269\u5c55\u53d8\u5316\u201d\u6240\u5bfc\u81f4\u7684\u5f71\u54cd\u964d\u5230\u6700\u4f4e<\/p>\n<p>\u6bd4\u5982\u8bf4\u73b0\u5728\u9700\u8981\u53bb\u5199\u6d41\u7684\u64cd\u4f5c\uff0c\u9700\u8981\u6587\u4ef6\u6d41\u3001\u7f51\u7edc\u6d41\u3001\u5185\u5b58\u6d41\uff0c\u6bcf\u79cd\u6d41\u90fd\u53ef\u80fd\u9700\u8981\u52a0\u5bc6\u6216\u8005\u7f13\u5b58\uff0c\u6216\u8005\u517c\u5177\u52a0\u5bc6\u548c\u7f13\u5b58\u3002<\/p>\n<p>\u4e0b\u8ff0\u5199\u6cd5\u662f\u9519\u8bef\u6837\u4f8b\uff0c\u5f53\u6bcf\u79cd\u6d41\u90fd\u6709\u53ef\u80fd\u6709\u52a0\u5bc6\u6216\u7f13\u5b58\u7684\u6269\u5c55\u64cd\u4f5c\u65f6\uff0c\u4e0d\u5e94\u8be5\u5c06\u5177\u6709\u8fd9\u4e9b\u6269\u5c55\u64cd\u4f5c\u7684\uff0c\u90fd\u5355\u72ec\u7ee7\u627f\u4e3a\u4e00\u4e2a\u7c7b\u3002\u5f53\u6d41\u7684\u7c7b\u578b\u6709n\u79cd\uff0c\u6269\u5c55\u64cd\u4f5c\u6709m\u79cd\u65f6\uff0c\u82e5\u6309\u5982\u4e0b\u5199\u6cd5\uff0c\u5219\u6700\u591a\u4f1a\u5199\u51fa 1+n+n*m!\/2\u79cd\u5b50\u7c7b\u3002\u8fd9\u6837\u7684\u4ee3\u7801\u91cd\u590d\u5ea6\u5341\u5206\u9ad8\u3002<\/p>\n<div class=\"mermaid mermaid-diagram no-emojify\"><script type=\"text\/javascript\">document.write(\"graph LR\\n\\n\\nid05(CryptoFileStream) --&gt; id02(FileStream)\\nid06(BufferedFileStream) --&gt; id02\\nid07(CryptoBufferedFileStream) --&gt; id02\\n\\nid08(CryptoNetworkStream) --&gt; id03(NetworkStream)\\nid09(BufferedNetworkStream) --&gt; id03\\nid10(CryptoBufferedNetworkStream) --&gt; id03\\n\\nid11(CryptoMemoryStream) --&gt; id04(MemoryStream)\\nid12(BufferedMemoryStream) --&gt; id04\\nid13(CryptoBufferedMemoryStream) --&gt; id04\\n\\nid02 --&gt; id01(Stream)\\nid03 --&gt; id01(Stream)\\nid04 --&gt; id01(Stream)\\n\");<\/script><\/div>\n<p>\u53ef\u91c7\u53d6\u4e0b\u8ff0\u5199\u6cd5\uff1a<br \/>\n\u5728\u8fd9\u79cd\u5199\u6cd5\u91cc\uff0cDecoratorStream\u7c7b\uff08\u540c\u65f6\u4e5f\u7ee7\u627f\u81eaStream\uff09\u5e94\u8be5\u5b9a\u4e49\u4e00\u4e2aStream\u7684\u6210\u5458\u53d8\u91cfa\uff0c\u63a5\u53d7\u4e0d\u540c\u7684Stream\u7c7b\u578b\u6765\u6784\u9020\uff0c\u6765\u521d\u59cb\u5316\u8be5\u6210\u5458\uff0c\u6bcf\u4e2aDecoratorStream\u5b50\u7c7b\u5e94\u91cd\u5199Stream\u7684\u865a\u51fd\u6570\uff0c\u5728\u865a\u51fd\u6570\u91cc\u8c03\u7528a\u7684\u8be5\u51fd\u6570\uff0c\u5e76\u9644\u52a0\u6240\u9700\u5185\u5bb9\u3002<br \/>\n\u91c7\u7528\u7684\u7ec4\u5408\u7684\u65b9\u5f0f\uff0c<\/p>\n<div class=\"mermaid mermaid-diagram no-emojify\"><script type=\"text\/javascript\">document.write(\"graph BT\\n\\nid02(FileStream) --&gt; id01(Stream)\\nid03(NetworkStream) --&gt; id01\\nid04(MemoryStream) --&gt; id01\\n\\nid06(CryptoStream) --&gt; id05(DecoratorStream)\\nid07(BufferedStream) --&gt; id05\\n\\nid05 --&gt; id01\\n\");<\/script><\/div>\n<p>\u4e8e\u6b64\uff0c\u6240\u9700\u6d41\u7684\u5b9e\u4f8b\u521b\u5efa\u4ee3\u7801\u4e3a\uff1a<\/p>\n<pre><code class=\"language-cpp line-numbers\">FileStream *s1 = new FileStream();  \/\/ \u57fa\u672c\u7684\u6587\u4ef6\u6d41\u529f\u80fd\nCryptoStream *s2 = new CryptoStream(s1);  \/\/ s2\u5177\u6709\u6587\u4ef6\u6d41\u52a0\u5bc6\u529f\u80fd\nBufferedStream *s3 = new BufferedStream(s1);  \/\/ s3\u5177\u6709\u6587\u4ef6\u6d41\u7f13\u5b58\u529f\u80fd\nBufferedStream *s4 = new BufferedStream(s2); \/\/ s4\u5177\u6709\u6587\u4ef6\u6d41\u52a0\u5bc6\u7f13\u5b58\u529f\u80fd\n\n<\/code><\/pre>\n<h2>\u6865\u6a21\u5f0f\uff08Bridge\uff09<\/h2>\n<p>\u7531\u4e8e\u67d0\u4e9b\u7c7b\u578b\u56fa\u6709\u7684\u5b9e\u73b0\u903b\u8f91\uff0c\u4f7f\u5f97\u5b83\u4eec\u5177\u6709\u591a\u4e2a\u53d8\u5316\u7684\u7ef4\u5ea6\u3002\u82e5\u5c06\u5176\u591a\u4e2a\u53d8\u5316\u7ef4\u5ea6\u7684\u5185\u5bb9\u7cc5\u6742\u5728\u4e00\u4e2a\u57fa\u7c7b\uff0c\u5219\u4f1a\u4f7f\u7ee7\u627f\u590d\u6742\u3002<\/p>\n<p>\u9519\u8bef\u793a\u8303\uff1a<\/p>\n<div class=\"mermaid mermaid-diagram no-emojify\"><script type=\"text\/javascript\">document.write(\"graph BT\\nid01(PCMessagerLite)--&gt;id02(PCMessagerBase)\\nid03(PCMessagerPefect) --&gt;id02\\n\\nid02 --&gt; id04(Messager)\\n\\nid05(MobileMessagerLite)--&gt;id07(MobileMessagerBase)\\nid06(MobileMessagerPefect) --&gt;id07\\n\\nid07 --&gt; id04(Messager)\\n\");<\/script><\/div>\n<pre><code class=\"language-cpp line-numbers\">class Messager{\npublic:\n    virtual void Login(string username, string password) = 0;\n    virtual void SendMessage(string message) = 0;\n    virtual void SendPicture(Image image) = 0;\n\n    virtual void PlaySound() = 0;\n    virtual void DrawShape() = 0;\n    virtual void WriteText() = 0;\n    virtual void Connect() = 0;\n\n    virtual ~Messager() {}\n};\n\n\/\/ PC\u5e73\u53f0\u5b9e\u73b0\nclass PCMessagerBase : public Messager{\npublic:\n    virtual void PlaySound(){\n        \/\/ ...    \n    }\n    virtual void DrawShape(){\n        \/\/ ...   \n    }\n    virtual void WriteText(){\n        \/\/ ...   \n    }\n    virtual void Connect(){\n        \/\/ ...\n    }\n};\n\n\/\/ \u4e1a\u52a1\u62bd\u8c61\n\/\/ 1. \u7ecf\u5178\u7248\u7684PC\nclass PCMessagerLite : public PCMessagerBase\n{\npublic:\n    virtual void Login(string username, string password){\n        PCMessagerBase::Connect();\n        \/\/ .....\n    }\n    virtual void SendMessage(string message){\n        PCMessagerBase::WriteText();\n        \/\/ .....\n    }\n    virtual void SendPicture(Image image){\n        PCMessagerBase::DrawShape();\n        \/\/ .....\n    }\n};\n\n\/\/ 2. \u534e\u4e3d\u7248\u7684PC\nclass PCMessagerPefect : public PCMessagerBase\n{\npublic:\n    virtual void Login(string username, string password){\n        \/\/ ..... new\n        PCMessagerBase::Connect();\n        \/\/ .....\n    }\n    virtual void SendMessage(string message){\n        \/\/ ..... new\n        PCMessagerBase::WriteText();\n        \/\/ .....\n    }\n    virtual void SendPicture(Image image){\n        \/\/ ..... new\n        PCMessagerBase::DrawShape();\n        \/\/ .....\n    }\n};\n\n\/\/ Mobile\u5e73\u53f0\u5b9e\u73b0\nclass MobileMessagerBase : public Messager{\npublic:\n    virtual void PlaySound(){\n        \/\/ ...    \n    }\n    virtual void DrawShape(){\n        \/\/ ...   \n    }\n    virtual void WriteText(){\n        \/\/ ...   \n    }\n    virtual void Connect(){\n        \/\/ ...\n    }\n};\n\n\/\/ \u4e1a\u52a1\u62bd\u8c61\n\/\/ 1. \u7ecf\u5178\u7248\u7684Mobile\nclass MoblieMessagerLite : public MobileMessagerBase\n{\npublic:\n    virtual void Login(string username, string password){\n        MobileMessagerBase::Connect();\n        \/\/ .....\n    }\n    virtual void SendMessage(string message){\n        MobileMessagerBase::WriteText();\n        \/\/ .....\n    }\n    virtual void SendPicture(Image image){\n        MobileMessagerBase::DrawShape();\n        \/\/ .....\n    }\n};\n\n\/\/ 2. \u534e\u4e3d\u7248\u7684Mobile\nclass MoblieMessagerPefect : public MobileMessagerBase\n{\npublic:\n    virtual void Login(string username, string password){\n        \/\/ ..... new\n        MobileMessagerBase::Connect();\n        \/\/ .....\n    }\n    virtual void SendMessage(string message){\n        \/\/ ..... new\n        MobileMessagerBase::WriteText();\n        \/\/ .....\n    }\n    virtual void SendPicture(Image image){\n        \/\/ ..... new\n        MobileMessagerBase::DrawShape();\n        \/\/ .....\n    }\n};\n<\/code><\/pre>\n<p>\u6b63\u786e\u793a\u4f8b\uff1a<\/p>\n<div class=\"mermaid mermaid-diagram no-emojify\"><script type=\"text\/javascript\">document.write(\"graph BT\\n\\nid01(MessagerLite) --&gt; id02(Messager)\\nid03(MessagerPerfect) --&gt; id02(Messager)\\n\\nid04(PCPlatform) --&gt; id05(PlatformFunc)\\nid06(MobilePlatform) --&gt; id05(PlatformFunc)\\n\\n\");<\/script><\/div>\n<p>\u5373Bridge\u6a21\u5f0f<strong>\u89e3\u8026\u4e86\u62bd\u8c61\u548c\u5b9e\u73b0\u4e4b\u95f4\u56fa\u6709\u7684\u7ed1\u5b9a\u5173\u7cfb\uff0c\u4f7f\u5f97\u62bd\u8c61\u548c\u5b9e\u73b0\u53ef\u4ee5\u6cbf\u7740\u5404\u81ea\u7684\u7ef4\u5ea6\u6765\u53d8\u5316<\/strong>\u3002Bridge\u6709\u65f6\u5019\u7c7b\u4f3c\u4e8e\u591a\u7ee7\u627f\u65b9\u6848\uff0c\u4f46\u591a\u7ee7\u627f\u5f80\u5f80\u8fdd\u80cc\u5355\u4e00\u804c\u8d23\u539f\u5219\uff0c\u590d\u7528\u6027\u8f83\u5dee\uff0c<strong>Bridge\u662f\u6bd4\u591a\u7ee7\u627f\u65b9\u6848\u66f4\u597d<\/strong>\u7684\u89e3\u51b3\u65b9\u6cd5\u3002<\/p>\n<pre><code class=\"language-cpp line-numbers\">class Messager{\nprotected: \n    PlatformFunc *plat;\npublic:\n    virtual void Login(string username, string password) = 0;\n    virtual void SendMessage(string message) = 0;\n    virtual void SendPicture(Image image) = 0;\n    virtual ~Messager() {}\n};\n\nclass PlatformFunc{\npublic:\n    virtual void PlaySound() = 0;\n    virtual void DrawShape() = 0;\n    virtual void WriteText() = 0;\n    virtual void Connect() = 0;\n\n    virtual ~PlatformFunc() {}\n};\n\n\/\/ Platform\u5e73\u53f0\u5b9e\u73b0\nclass PCPlatform : public PlatformFunc{\npublic:\n    virtual void PlaySound(){\n        \/\/ ...    \n    }\n    virtual void DrawShape(){\n        \/\/ ...   \n    }\n    virtual void WriteText(){\n        \/\/ ...   \n    }\n    virtual void Connect(){\n        \/\/ ...\n    }\n};\n\n\/\/ Mobile\u5e73\u53f0\u5b9e\u73b0\nclass MobilePlatform : public PlatformFunc{\npublic:\n    virtual void PlaySound(){\n        \/\/ ...    \n    }\n    virtual void DrawShape(){\n        \/\/ ...   \n    }\n    virtual void WriteText(){\n        \/\/ ...   \n    }\n    virtual void Connect(){\n        \/\/ ...\n    }\n};\n\nclass MessagerLite : public Messager{\npublic:\n    virtual void Login(string username, string password){\n        plat-&gt;Connect();\n        \/\/ .....\n    }\n    virtual void SendMessage(string message){\n        plat-&gt;WriteText();\n        \/\/ .....\n    }\n    virtual void SendPicture(Image image){\n        plat-&gt;DrawShape();\n        \/\/ .....\n    }\n};\n\nclass MessagerPerfect : public Messager{\npublic:\n    virtual void Login(string username, string password){\n        \/\/ ..... new\n        plat-&gt;Connect();\n        \/\/ .....\n    }\n    virtual void SendMessage(string message){\n        \/\/ ..... new\n        plat-&gt;WriteText();\n        \/\/ .....\n    }\n    virtual void SendPicture(Image image){\n        \/\/ ..... new\n        plat-&gt;DrawShape();\n        \/\/ .....\n    }\n};\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u5728\u8f6f\u4ef6\u7ec4\u4ef6\u7684\u8bbe\u8ba1\u4e2d\uff0c\u5982\u679c\u8d23\u4efb\u5212\u5206\u7684\u4e0d\u6e05\u6670\uff0c\u4f7f\u7528\u7ee7\u627f\u5f97\u5230\u7684\u7ed3\u679c\u5f80\u5f80\u662f\u968f\u7740\u9700\u6c42\u7684\u53d8\u5316\uff0c\u5b50\u7c7b\u6025\u5267\u81a8\u80c0\uff0c\u540c\u65f6\u5145\u65a5\u7740\u91cd\u590d&hellip;<a href=\"https:\/\/www.notown.top\/?p=740\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">\u5355\u4e00\u804c\u8d23\u6a21\u5f0f\uff08\u88c5\u9970\u5668\u3001\u6865\uff09<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[22],"tags":[],"class_list":["post-740","post","type-post","status-publish","format-standard","hentry","category-22"],"_links":{"self":[{"href":"https:\/\/www.notown.top\/index.php?rest_route=\/wp\/v2\/posts\/740","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.notown.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.notown.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.notown.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.notown.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=740"}],"version-history":[{"count":4,"href":"https:\/\/www.notown.top\/index.php?rest_route=\/wp\/v2\/posts\/740\/revisions"}],"predecessor-version":[{"id":766,"href":"https:\/\/www.notown.top\/index.php?rest_route=\/wp\/v2\/posts\/740\/revisions\/766"}],"wp:attachment":[{"href":"https:\/\/www.notown.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=740"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.notown.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=740"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.notown.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=740"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}