{"id":40998,"date":"2025-05-30T12:27:23","date_gmt":"2025-05-30T04:27:23","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/40998.html"},"modified":"2025-05-30T12:27:23","modified_gmt":"2025-05-30T04:27:23","slug":"%e3%80%90c%e3%80%91string%e7%9a%84%e8%af%ad%e6%b3%95%e5%8f%8a%e5%b8%b8%e7%94%a8%e6%8e%a5%e5%8f%a3%e5%ba%95%e5%b1%82%e6%a8%a1%e6%8b%9f%e5%ae%9e%e7%8e%b0","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/40998.html","title":{"rendered":"\u3010C++\u3011String\u7684\u8bed\u6cd5\u53ca\u5e38\u7528\u63a5\u53e3\u5e95\u5c42\u6a21\u62df\u5b9e\u73b0"},"content":{"rendered":"<\/p>\n<h4>\u3010C&#043;&#043;\u3011String\u7684\u8bed\u6cd5\u53ca\u5e38\u7528\u63a5\u53e3\u5e95\u5c42\u6a21\u62df\u5b9e\u73b0<\/h4>\n<ul>\n<li>\u4e00\u3001string\u7c7b(\u4e86\u89e3)<\/li>\n<li>\u4e8c\u3001string\u7c7b\u7684\u5e38\u7528\u63a5\u53e3<\/li>\n<li>\n<ul>\n<li>2.1 string\u7c7b\u5bf9\u8c61\u7684\u5e38\u89c1\u6784\u9020<\/li>\n<li>2.2 string\u7c7b\u5bf9\u8c61\u7684\u5bb9\u91cf\u64cd\u4f5c<\/li>\n<li>2.3 string\u7c7b\u5bf9\u8c61\u7684\u8bbf\u95ee\u53ca\u904d\u5386\u64cd\u4f5c<\/li>\n<li>2.4 string\u7c7b\u5bf9\u8c61\u7684\u4fee\u6539\u64cd\u4f5c<\/li>\n<li>2.5 string\u7c7b\u975e\u6210\u5458\u51fd\u6570<\/li>\n<\/ul>\n<\/li>\n<li>\u4e09\u3001string\u7c7b\u5e38\u7528\u63a5\u53e3\u7684\u6a21\u62df\u5b9e\u73b0<\/li>\n<li>\n<ul>\n<li>3.1 \u521d\u5efa\u6784\u9020<\/li>\n<li>3.2 \u8d4b\u503c\u91cd\u8f7d<\/li>\n<li>3.3 \u8fd4\u56de\u5bb9\u91cf\u5927\u5c0f\u4e0e\u3010\u3011<\/li>\n<li>3.4 reserve&#xff0c;resize<\/li>\n<li>3.5 \u63d2\u5165&#xff08;push_back,append,operator&#043;&#061;,insert&#xff09;<\/li>\n<li>3.6 \u5220\u9664&#xff08;erase&#xff09;,\u6e05\u7a7a&#xff08;clear&#xff09;<\/li>\n<li>3.7 \u67e5\u627e&#xff08;find&#xff09;<\/li>\n<li>3.8 \u8fd4\u56de\u5b50\u4e32&#xff08;substr&#xff09;<\/li>\n<li>3.9 \u6bd4\u8f83\u7b26\u53f7&#xff08;&lt;,&gt;,&#061;&#061;,&lt;&#061;,&gt;&#061;,!&#061;&#xff09;<\/li>\n<li>3.10 \u8fed\u4ee3\u5668&#xff08;iterator&#xff09;<\/li>\n<li>3.11 \u6d41\u63d2\u5165&#xff08;&lt;&lt;&#xff09;&#xff0c;\u6d41\u63d0\u53d6&#xff08;&gt;&gt;&#xff09;<\/li>\n<\/ul>\n<\/li>\n<li>\u56db\u3001\u603b\u7ed3<\/li>\n<\/ul>\n<h2>\u4e00\u3001string\u7c7b(\u4e86\u89e3)<\/h2>\n<li>string\u662f\u8868\u793a\u5b57\u7b26\u4e32\u7684\u5b57\u7b26\u4e32\u7c7b<\/li>\n<li>\u8be5\u7c7b\u7684\u63a5\u53e3\u4e0e\u5e38\u89c4\u5bb9\u5668\u7684\u63a5\u53e3\u57fa\u672c\u76f8\u540c&#xff0c;\u518d\u6dfb\u52a0\u4e86\u4e00\u4e9b\u4e13\u95e8\u7528\u6765\u64cd\u4f5cstring\u7684\u5e38\u89c4\u64cd\u4f5c\u3002<\/li>\n<li>string\u5728\u5e95\u5c42\u5b9e\u9645\u662f&#xff1a;basic_string\u6a21\u677f\u7c7b\u7684\u522b\u540d&#xff0c;typedef basic_string&lt;char, char_traits, allocator&gt; string;<\/li>\n<li>\u4e0d\u80fd\u64cd\u4f5c\u591a\u5b57\u8282\u6216\u8005\u53d8\u957f\u5b57\u7b26\u7684\u5e8f\u5217\u3002\u5728\u4f7f\u7528string\u7c7b\u65f6&#xff0c;\u5fc5\u987b\u5305\u542b#include\u5934\u6587\u4ef6\u4ee5\u53causing namespace std;<\/li>\n<ul>\n<li>C&#043;&#043; \u7684 std::string \u662f\u4e00\u4e2a\u52a8\u6001\u5b57\u7b26\u6570\u7ec4&#xff0c;\u652f\u6301\u591a\u79cd\u64cd\u4f5c&#xff0c;\u4e14\u662f\u53ef\u53d8\u7684\u3002\u5728\u4f7f\u7528string\u7c7b\u65f6&#xff0c;\u5fc5\u987b\u5305\u542b#include\u5934\u6587\u4ef6\u4ee5\u53causing namespace std;<\/li>\n<\/ul>\n<h2>\u4e8c\u3001string\u7c7b\u7684\u5e38\u7528\u63a5\u53e3<\/h2>\n<h3>2.1 string\u7c7b\u5bf9\u8c61\u7684\u5e38\u89c1\u6784\u9020<\/h3>\n<ul>\n<li>\u51fd\u6570\u540d\u79f0 &#8212;&#8212;-\u529f\u80fd\u8bf4\u660e<\/li>\n<li>string() &#8212;&#8212;&#8211; \u6784\u9020\u7a7a\u7684string\u7c7b\u5bf9\u8c61&#xff0c;\u5373\u7a7a\u5b57\u7b26\u4e32<\/li>\n<li>string(const char * s) &#8212;&#8212;&#8211; \u7528C-string\u6765\u6784\u9020string\u7c7b\u5bf9\u8c61<\/li>\n<li>string(size_t n, char c) &#8212;&#8212;- string\u7c7b\u5bf9\u8c61\u4e2d\u5305\u542bn\u4e2a\u5b57\u7b26c<\/li>\n<li>string(const string&amp;s) &#8212;&#8212;&#8211; \u62f7\u8d1d\u6784\u9020\u51fd\u6570<\/li>\n<\/ul>\n<p><span class=\"token keyword\">void<\/span> <span class=\"token function\">Teststring<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n string s1<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u6784\u9020\u7a7a\u7684string\u7c7b\u5bf9\u8c61s1<\/span><br \/>\n string <span class=\"token function\">s2<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;hello bit&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u7528C\u683c\u5f0f\u5b57\u7b26\u4e32\u6784\u9020string\u7c7b\u5bf9\u8c61s2<\/span><br \/>\n string <span class=\"token function\">s3<\/span><span class=\"token punctuation\">(<\/span>s2<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u62f7\u8d1d\u6784\u9020s3<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>2.2 string\u7c7b\u5bf9\u8c61\u7684\u5bb9\u91cf\u64cd\u4f5c<\/h3>\n<ul>\n<li>\u51fd\u6570\u540d\u79f0 &#8212;&#8212;- \u529f\u80fd\u8bf4\u660e<\/li>\n<li>size &#8212;&#8212;- \u8fd4\u56de\u5b57\u7b26\u4e32\u6709\u6548\u5b57\u7b26\u957f\u5ea6<\/li>\n<li>length &#8212;&#8212;- \u8fd4\u56de\u5b57\u7b26\u4e32\u6709\u6548\u5b57\u7b26\u957f\u5ea6<\/li>\n<li>capacity &#8212;&#8212;-\u8fd4\u56de\u7a7a\u95f4\u603b\u5927\u5c0f<\/li>\n<li>empty &#8212;&#8212;- \u68c0\u6d4b\u5b57\u7b26\u4e32\u91ca\u653e\u4e3a\u7a7a\u4e32&#xff0c;\u662f\u8fd4\u56detrue&#xff0c;\u5426\u5219\u8fd4\u56defalse<\/li>\n<li>clear &#8212;&#8212;- \u6e05\u7a7a\u6709\u6548\u5b57\u7b26<\/li>\n<li>reserve &#8212;&#8212;- \u4e3a\u5b57\u7b26\u4e32\u9884\u7559\u7a7a\u95f4<\/li>\n<li>resize &#8212;&#8212;- \u5c06\u6709\u6548\u5b57\u7b26\u7684\u4e2a\u6570\u8be5\u6210n\u4e2a&#xff0c;\u591a\u51fa\u7684\u7a7a\u95f4\u7528\u5b57\u7b26c\u586b\u5145<\/li>\n<\/ul>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/05\/20250530042721-683933a944030.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u6ce8\u610f&#xff1a; 1. size()\u4e0elength()\u65b9\u6cd5\u5e95\u5c42\u5b9e\u73b0\u539f\u7406\u5b8c\u5168\u76f8\u540c&#xff0c;\u5f15\u5165size()\u7684\u539f\u56e0\u662f\u4e3a\u4e86\u4e0e\u5176\u4ed6\u5bb9\u5668\u7684\u63a5\u53e3\u4fdd\u6301\u4e00 \u81f4&#xff0c;\u4e00\u822c\u60c5\u51b5\u4e0b\u57fa\u672c\u90fd\u662f\u7528size()\u3002 2. clear()\u53ea\u662f\u5c06string\u4e2d\u6709\u6548\u5b57\u7b26\u6e05\u7a7a&#xff0c;\u4e0d\u6539\u53d8\u5e95\u5c42\u7a7a\u95f4\u5927\u5c0f\u3002 3. resize(size_t n) \u4e0e resize(size_t n, char c)\u90fd\u662f\u5c06\u5b57\u7b26\u4e32\u4e2d\u6709\u6548\u5b57\u7b26\u4e2a\u6570\u6539\u53d8\u5230n\u4e2a&#xff0c;\u4e0d\u540c\u7684\u662f\u5f53\u5b57\u7b26\u4e2a\u6570\u589e\u591a\u65f6&#xff1a;resize(n)\u75280\u6765\u586b\u5145\u591a\u51fa\u7684\u5143\u7d20\u7a7a\u95f4&#xff0c;resize(size_t n, char c)\u7528\u5b57\u7b26c\u6765\u586b\u5145\u591a\u51fa\u7684\u5143\u7d20\u7a7a\u95f4\u3002 [\u6ce8\u610f]&#xff1a;resize\u5728\u6539\u53d8\u5143\u7d20\u4e2a\u6570\u65f6&#xff0c;\u5982\u679c\u662f\u5c06\u5143\u7d20\u4e2a\u6570\u589e\u591a&#xff0c;\u53ef\u80fd\u4f1a\u6539\u53d8\u5e95\u5c42\u5bb9\u91cf\u7684\u5927\u5c0f&#xff0c;\u5982\u679c\u662f\u5c06\u5143\u7d20\u4e2a\u6570\u51cf\u5c11&#xff0c;\u5e95\u5c42\u7a7a\u95f4\u603b\u5927\u5c0f\u4e0d\u53d8\u3002 4. reserve(size_t res_arg&#061;0)&#xff1a;\u4e3astring\u9884\u7559\u7a7a\u95f4&#xff0c;\u4e0d\u6539\u53d8\u6709\u6548\u5143\u7d20\u4e2a\u6570&#xff0c;\u5f53reserve\u7684\u53c2\u6570\u5c0f\u4e8estring\u7684\u5e95\u5c42\u7a7a\u95f4\u603b\u5927\u5c0f\u65f6&#xff0c;reserver\u4e0d\u4f1a\u6539\u53d8\u5bb9\u91cf\u5927\u5c0f\u3002<\/p>\n<h3>2.3 string\u7c7b\u5bf9\u8c61\u7684\u8bbf\u95ee\u53ca\u904d\u5386\u64cd\u4f5c<\/h3>\n<ul>\n<li>\u51fd\u6570\u540d\u79f0 &#8212;&#8212;- \u529f\u80fd\u8bf4\u660e<\/li>\n<li>operator[] &#8212;&#8212;- \u8fd4\u56depos\u4f4d\u7f6e\u7684\u5b57\u7b26&#xff0c;const string\u7c7b\u5bf9\u8c61\u8c03\u7528<\/li>\n<li>begin&#043; end &#8212;&#8212;- begin\u83b7\u53d6\u4e00\u4e2a\u5b57\u7b26\u7684\u8fed\u4ee3\u5668 &#043; end\u83b7\u53d6\u6700\u540e\u4e00\u4e2a\u5b57\u7b26\u4e0b\u4e00\u4e2a\u4f4d\u7f6e\u7684\u8fed\u4ee3\u5668<\/li>\n<li>\u8303\u56f4for &#8212;&#8212;- C&#043;&#043;11\u652f\u6301\u66f4\u7b80\u6d01\u7684\u8303\u56f4for\u7684\u65b0\u904d\u5386\u65b9\u5f0f<\/li>\n<\/ul>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/05\/20250530042721-683933a98b035.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h3>2.4 string\u7c7b\u5bf9\u8c61\u7684\u4fee\u6539\u64cd\u4f5c<\/h3>\n<ul>\n<li>\u51fd\u6570\u540d\u79f0 &#8212;&#8212;- \u529f\u80fd\u8bf4\u660e<\/li>\n<li>push_back &#8212;&#8212;- \u5728\u5b57\u7b26\u4e32\u540e\u5c3e\u63d2\u5b57\u7b26c<\/li>\n<li>append &#8212;&#8212;- \u5728\u5b57\u7b26\u4e32\u540e\u8ffd\u52a0\u4e00\u4e2a\u5b57\u7b26\u4e32<\/li>\n<li>operator&#043;&#061; &#8212;&#8212;- \u5728\u5b57\u7b26\u4e32\u540e\u8ffd\u52a0\u5b57\u7b26\u4e32str<\/li>\n<li>c_str &#8212;&#8212;- \u8fd4\u56deC\u683c\u5f0f\u5b57\u7b26\u4e32<\/li>\n<li>\ufb01nd &#043; npos &#8212;&#8212;- \u4ece\u5b57\u7b26\u4e32pos\u4f4d\u7f6e\u5f00\u59cb\u5f80\u540e\u627e\u5b57\u7b26c&#xff0c;\u8fd4\u56de\u8be5\u5b57\u7b26\u5728\u5b57\u7b26\u4e32\u4e2d\u7684\u4f4d\u7f6e<\/li>\n<li>r\ufb01nd &#8212;&#8212;- \u4ece\u5b57\u7b26\u4e32pos\u4f4d\u7f6e\u5f00\u59cb\u5f80\u524d\u627e\u5b57\u7b26c&#xff0c;\u8fd4\u56de\u8be5\u5b57\u7b26\u5728\u5b57\u7b26\u4e32\u4e2d\u7684\u4f4d\u7f6e<\/li>\n<li>substr &#8212;&#8212;- \u5728str\u4e2d\u4ecepos\u4f4d\u7f6e\u5f00\u59cb&#xff0c;\u622a\u53d6n\u4e2a\u5b57\u7b26&#xff0c;\u7136\u540e\u5c06\u5176\u8fd4\u56de <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/05\/20250530042722-683933aa117eb.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/li>\n<\/ul>\n<p>\u6ce8\u610f&#xff1a; 1. \u5728string\u5c3e\u90e8\u8ffd\u52a0\u5b57\u7b26\u65f6&#xff0c;s.push_back\u00a9 \/ s.append(1, c) \/ s &#043;&#061; &#039;c\u2019\u4e09\u79cd\u7684\u5b9e\u73b0\u65b9\u5f0f\u5dee\u4e0d\u591a&#xff0c;\u4e00\u822c\u60c5\u51b5\u4e0bstring\u7c7b\u7684&#043;&#061;\u64cd\u4f5c\u7528\u7684\u6bd4\u8f83\u591a&#xff0c;&#043;&#061;\u64cd\u4f5c\u4e0d\u4ec5\u53ef\u4ee5\u8fde\u63a5\u5355\u4e2a\u5b57\u7b26&#xff0c;\u8fd8\u53ef\u4ee5\u8fde\u63a5\u5b57\u7b26\u4e32\u3002 2. \u5bf9string\u64cd\u4f5c\u65f6&#xff0c;\u5982\u679c\u80fd\u591f\u5927\u6982\u9884\u4f30\u5230\u653e\u591a\u5c11\u5b57\u7b26&#xff0c;\u53ef\u4ee5\u5148\u901a\u8fc7reserve\u628a\u7a7a\u95f4\u9884\u7559\u597d\u3002<\/p>\n<h3>2.5 string\u7c7b\u975e\u6210\u5458\u51fd\u6570<\/h3>\n<ul>\n<li>\u51fd\u6570\u540d\u79f0 &#8212;&#8212;- \u529f\u80fd\u8bf4\u660e<\/li>\n<li>operator&#043; &#8212;&#8212;- \u5c3d\u91cf\u5c11\u7528&#xff0c;\u56e0\u4e3a\u4f20\u503c\u8fd4\u56de&#xff0c;\u5bfc\u81f4\u6df1\u62f7\u8d1d\u6548\u7387\u4f4e<\/li>\n<li>operator&gt;&gt; &#8212;&#8212;- \u8f93\u5165\u8fd0\u7b97\u7b26\u91cd\u8f7d<\/li>\n<li>operator&lt;&lt; &#8212;&#8212;- \u8f93\u51fa\u8fd0\u7b97\u7b26\u91cd\u8f7d<\/li>\n<li>getline &#8212;&#8212;- \u83b7\u53d6\u4e00\u884c\u5b57\u7b26\u4e32<\/li>\n<li>&lt;\u3001&gt;\u3001&#061;\u3001&gt;&#061;\u3001&lt;&#061;\u3001&#061;&#061; &#8212;&#8212;- \u5927\u5c0f\u6bd4\u8f83<\/li>\n<\/ul>\n<h2>\u4e09\u3001string\u7c7b\u5e38\u7528\u63a5\u53e3\u7684\u6a21\u62df\u5b9e\u73b0<\/h2>\n<h3>3.1 \u521d\u5efa\u6784\u9020<\/h3>\n<ul>\n<li>\u6211\u4eec\u8fd0\u7528\u4e00\u4e2a\u5b57\u7b26\u6570\u7ec4\u6765\u5b58string&#xff0c;\u79c1\u6709\u90e8\u5206\u5305\u62ec\u5b57\u7b26\u5927\u5c0fsize&#xff0c;\u548c\u7a7a\u95f4\u5bb9\u91cfcapacity&#xff0c;_str\u5b57\u7b26\u6570\u7ec4<\/li>\n<li>\u6784\u9020\u51fd\u6570\u7684\u5f62\u53c2\u8fd0\u7528\u7f3a\u7701\u53c2\u6570&#xff0c;\u5f53\u4e0d\u4f20\u53c2\u65f6&#xff0c;\u5c06\u4f1a\u53d8\u4e3a\u7a7a\u4e32&#xff0c;\u8fd0\u7528strlen\u5f97\u5230\u4f20\u5165\u7684\u5b57\u7b26\u4e32\u5927\u5c0f&#xff0c;\u518dnew\u4e00\u4e2a\u5bb9\u91cf\u8f83\u5927\u7684\u5b57\u7b26\u6570\u7ec4&#xff0c;\u8ba9_str\u6307\u5411\u8fd9\u4e2a\u6570\u7ec4&#xff0c;\u6700\u540e\u7528memcpy&#xff0c;\u5c06\u4f20\u5165\u7684\u5b57\u7b26\u4e32\u5185\u5bb9\u62f7\u8d1d\u7ed9_str<\/li>\n<li>\u62f7\u8d1d\u6784\u9020\u601d\u8def\u4e0e\u6784\u9020\u51fd\u6570\u601d\u8def\u76f8\u540c<\/li>\n<li>\u6790\u6784\u51fd\u6570\u5c06_str\u91ca\u653e&#xff0c;\u518d\u5c06size\u4e0ecapacity\u7f6e\u4e3a0<\/li>\n<li>\u518d\u5199\u4e00\u4e2ac_str\u63a5\u53e3&#xff0c;\u65b9\u4fbf\u6253\u5370\u67e5\u770b&#xff0c;\u4e0ec\u8bed\u8a00\u9002\u914d<\/li>\n<\/ul>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">string<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">public<\/span><span class=\"token operator\">:<\/span><br \/>\n<span class=\"token keyword\">const<\/span> <span class=\"token keyword\">static<\/span> size_t npos <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/\u8bbe\u7f6e\u4e00\u4e2anpos\u540e\u9762\u8981\u7528&#xff0c;\u7c7b\u578b\u4e3asize_t\u6240\u4ee5\u8fd9\u91cc\u7684npos\u662f\u4e00\u4e2a\u975e\u5e38\u5927\u7684\u6574\u6570<\/span><\/p>\n<p><span class=\"token comment\">\/\/\u6784\u9020\u51fd\u6570<\/span><br \/>\n<span class=\"token function\">string<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> <span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> str <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n_size <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">strlen<\/span><span class=\"token punctuation\">(<\/span>str<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n_capacity <span class=\"token operator\">&#061;<\/span> _size<span class=\"token punctuation\">;<\/span><br \/>\n_str <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token keyword\">char<\/span><span class=\"token punctuation\">[<\/span>_capacity <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">memcpy<\/span><span class=\"token punctuation\">(<\/span>_str<span class=\"token punctuation\">,<\/span> str<span class=\"token punctuation\">,<\/span> _size <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token comment\">\/\/\u62f7\u8d1d\u6784\u9020<\/span><br \/>\n<span class=\"token function\">string<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> string<span class=\"token operator\">&amp;<\/span> s<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n_str <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token keyword\">char<\/span><span class=\"token punctuation\">[<\/span>s<span class=\"token punctuation\">.<\/span>_capacity <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">memcpy<\/span><span class=\"token punctuation\">(<\/span>_str<span class=\"token punctuation\">,<\/span> s<span class=\"token punctuation\">.<\/span>_str<span class=\"token punctuation\">,<\/span> s<span class=\"token punctuation\">.<\/span>_size <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n_size <span class=\"token operator\">&#061;<\/span> s<span class=\"token punctuation\">.<\/span>_size<span class=\"token punctuation\">;<\/span><br \/>\n_capacity <span class=\"token operator\">&#061;<\/span> s<span class=\"token punctuation\">.<\/span>_capacity<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token comment\">\/\/\u6790\u6784\u51fd\u6570<\/span><br \/>\n<span class=\"token operator\">~<\/span><span class=\"token function\">string<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">delete<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> _str<span class=\"token punctuation\">;<\/span><br \/>\n_str <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">nullptr<\/span><span class=\"token punctuation\">;<\/span><br \/>\n_size <span class=\"token operator\">&#061;<\/span> _capacity <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token comment\">\/\/c_str<\/span><br \/>\n<span class=\"token keyword\">const<\/span> <span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> <span class=\"token function\">c_str<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token keyword\">const<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">return<\/span> _str<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">private<\/span><span class=\"token operator\">:<\/span><br \/>\nsize_t _size<span class=\"token punctuation\">;<\/span><br \/>\nsize_t _capacity<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> _str<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h3>3.2 \u8d4b\u503c\u91cd\u8f7d<\/h3>\n<p>\u5148\u5199\u4e00\u4e2a\u81ea\u5b9a\u4e49\u7684\u4ea4\u6362string\u7684\u51fd\u6570&#xff0c;\u5c06\u4f20\u5165\u7684\u5f62\u53c2\u4e0ethis\u7684\u6570\u636e\u4ea4\u6362&#xff0c;\u6700\u540e\u8fd4\u56de*this<\/p>\n<p><span class=\"token comment\">\/\/\u8d4b\u503c\u91cd\u8f7d<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">swap<\/span><span class=\"token punctuation\">(<\/span>string<span class=\"token operator\">&amp;<\/span> s<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\nstd<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">swap<\/span><span class=\"token punctuation\">(<\/span>_str<span class=\"token punctuation\">,<\/span> s<span class=\"token punctuation\">.<\/span>_str<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nstd<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">swap<\/span><span class=\"token punctuation\">(<\/span>_size<span class=\"token punctuation\">,<\/span> s<span class=\"token punctuation\">.<\/span>_size<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nstd<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">swap<\/span><span class=\"token punctuation\">(<\/span>_capacity<span class=\"token punctuation\">,<\/span> s<span class=\"token punctuation\">.<\/span>_capacity<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\nstring<span class=\"token operator\">&amp;<\/span> <span class=\"token keyword\">operator<\/span><span class=\"token operator\">&#061;<\/span><span class=\"token punctuation\">(<\/span>string tmp<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token function\">swap<\/span><span class=\"token punctuation\">(<\/span>tmp<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">return<\/span> <span class=\"token operator\">*<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>3.3 \u8fd4\u56de\u5bb9\u91cf\u5927\u5c0f\u4e0e\u3010\u3011<\/h3>\n<p><span class=\"token comment\">\/\/size&#xff0c;capacity<\/span><br \/>\nsize_t <span class=\"token function\">size<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token keyword\">const<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">return<\/span> _size<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\nsize_t <span class=\"token function\">capacity<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token keyword\">const<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">return<\/span> _capacity<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token comment\">\/\/[]\u6a21\u62df\u5b9e\u73b0<\/span><br \/>\n<span class=\"token keyword\">char<\/span><span class=\"token operator\">&amp;<\/span> <span class=\"token keyword\">operator<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">(<\/span>size_t pos<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token function\">assert<\/span><span class=\"token punctuation\">(<\/span>pos <span class=\"token operator\">&lt;<\/span> _size<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">return<\/span> _str<span class=\"token punctuation\">[<\/span>pos<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">const<\/span> <span class=\"token keyword\">char<\/span><span class=\"token operator\">&amp;<\/span> <span class=\"token keyword\">operator<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">(<\/span>size_t pos<span class=\"token punctuation\">)<\/span><span class=\"token keyword\">const<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token function\">assert<\/span><span class=\"token punctuation\">(<\/span>pos <span class=\"token operator\">&lt;<\/span> _size<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">return<\/span> _str<span class=\"token punctuation\">[<\/span>pos<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>3.4 reserve&#xff0c;resize<\/h3>\n<ul>\n<li>reserve&#xff1a;\u5982\u679c\u9700\u8981\u7684\u7a7a\u95f4n\u5927\u4e8e\u539f\u7a7a\u95f4&#xff0c;\u5219\u8981\u8fdb\u884c\u6269\u5bb9&#xff0c;\u521b\u5efa\u4e00\u4e2a\u4e34\u65f6\u53d8\u91cftmp\u6307\u5411new\u7684\u65b0\u7a7a\u95f4&#xff0c;\u8fd0\u7528memcpy\u5c06\u539f\u6570\u636e\u62f7\u8d1d\u7ed9tmp&#xff0c;\u5c06\u539f\u6765_str\u6240\u5728\u7a7a\u95f4\u91ca\u653e&#xff0c;\u518d\u5c06_str\u53ea\u5411tmp\u6240\u6307\u5411\u7684\u7a7a\u95f4&#xff0c;size\u4e0d\u53d8&#xff0c;capacity\u53d8\u4e3a\u6269\u5bb9\u540e\u7684n<\/li>\n<li>resize&#xff1a;\u5982\u679c\u662f\u7f29\u5c0f&#xff0c;n\u5c0f\u4e8e\u539f\u6765\u7684size&#xff0c;\u76f4\u63a5\u5728\u4e0b\u6807\u4e3an\u7684\u4f4d\u7f6e\u7f6e\u4e3a\\\\0\u3002\u5982\u679c\u662f\u6269\u5927&#xff0c;\u5148\u7528reserve\u6269\u5bb9&#xff0c;\u518d\u5c06ch\u653e\u5165\u5b57\u7b26\u6570\u7ec4<\/li>\n<\/ul>\n<p><span class=\"token comment\">\/\/reserve\u6a21\u62df\u5b9e\u73b0<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">reserve<\/span><span class=\"token punctuation\">(<\/span>size_t n<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>n <span class=\"token operator\">&gt;<\/span> _capacity<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> tmp <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token keyword\">char<\/span><span class=\"token punctuation\">[<\/span>n <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">memcpy<\/span><span class=\"token punctuation\">(<\/span>tmp<span class=\"token punctuation\">,<\/span> _str<span class=\"token punctuation\">,<\/span>_size <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">delete<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span>_str<span class=\"token punctuation\">;<\/span><br \/>\n_str <span class=\"token operator\">&#061;<\/span> tmp<span class=\"token punctuation\">;<\/span><br \/>\n_capacity <span class=\"token operator\">&#061;<\/span> n<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token comment\">\/\/resize\u6a21\u62df\u5b9e\u73b0<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">resize<\/span><span class=\"token punctuation\">(<\/span>size_t n<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">char<\/span> ch <span class=\"token operator\">&#061;<\/span> <span class=\"token char\">&#039;\\\\0&#039;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>n <span class=\"token operator\">&lt;<\/span> _size<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n_size <span class=\"token operator\">&#061;<\/span> n<span class=\"token punctuation\">;<\/span><br \/>\n_str<span class=\"token punctuation\">[<\/span>_size<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token char\">&#039;\\\\0&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">else<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token function\">reserve<\/span><span class=\"token punctuation\">(<\/span>n<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span>size_t i <span class=\"token operator\">&#061;<\/span> _size<span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> n<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n_str<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> ch<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token punctuation\">}<\/span><br \/>\n_size <span class=\"token operator\">&#061;<\/span> n<span class=\"token punctuation\">;<\/span><br \/>\n_str<span class=\"token punctuation\">[<\/span>_size<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token char\">&#039;\\\\0&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>3.5 \u63d2\u5165&#xff08;push_back,append,operator&#043;&#061;,insert&#xff09;<\/h3>\n<ul>\n<li>\u63d2\u5165\u7684\u4e3b\u8981\u601d\u60f3&#xff0c;\u5c31\u662f\u7a7a\u95f4\u4e0d\u591f\u5c31\u6269\u5bb9&#xff0c;\u7136\u540e\u5c06\u5b57\u7b26\u653e\u5165\u6570\u7ec4&#xff0c;\u5199\u51fapush_back\u548cappend&#xff0c;\u5c31\u53ef\u4ee5\u590d\u7528\u5199\u51fa&#043;&#061;&#xff0c;insert<\/li>\n<\/ul>\n<p><span class=\"token comment\">\/\/push_back\u6a21\u62df\u5b9e\u73b0<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">push_back<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">char<\/span> ch<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>_size <span class=\"token operator\">&#061;&#061;<\/span> _capacity<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token comment\">\/\/2\u500d\u6269\u5bb9<\/span><br \/>\n<span class=\"token function\">reserve<\/span><span class=\"token punctuation\">(<\/span>_capacity <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span> <span class=\"token operator\">?<\/span> <span class=\"token number\">4<\/span> <span class=\"token operator\">:<\/span> _capacity <span class=\"token operator\">*<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token punctuation\">}<\/span><br \/>\n_str<span class=\"token punctuation\">[<\/span>_size<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> ch<span class=\"token punctuation\">;<\/span><br \/>\n_size<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n_str<span class=\"token punctuation\">[<\/span>_size<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token char\">&#039;\\\\0&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/append\u6a21\u62df\u5b9e\u73b0<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">append<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> <span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> str<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\nsize_t len <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">strlen<\/span><span class=\"token punctuation\">(<\/span>str<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>_size <span class=\"token operator\">&#043;<\/span> len <span class=\"token operator\">&gt;<\/span> _capacity<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token function\">reserve<\/span><span class=\"token punctuation\">(<\/span>_size <span class=\"token operator\">&#043;<\/span> len<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token function\">memcpy<\/span><span class=\"token punctuation\">(<\/span>_str <span class=\"token operator\">&#043;<\/span> _size<span class=\"token punctuation\">,<\/span> str<span class=\"token punctuation\">,<\/span> len <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    _size <span class=\"token operator\">&#043;&#061;<\/span> len<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/&#043;&#061;\u6a21\u62df\u5b9e\u73b0<\/span><br \/>\nstring<span class=\"token operator\">&amp;<\/span> <span class=\"token keyword\">operator<\/span><span class=\"token operator\">&#043;&#061;<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">char<\/span> ch<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token function\">push_back<\/span><span class=\"token punctuation\">(<\/span>ch<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">return<\/span> <span class=\"token operator\">*<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\nstring<span class=\"token operator\">&amp;<\/span> <span class=\"token keyword\">operator<\/span><span class=\"token operator\">&#043;&#061;<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> <span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> str<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token function\">append<\/span><span class=\"token punctuation\">(<\/span>str<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">return<\/span> <span class=\"token operator\">*<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/insert\u6a21\u62df\u5b9e\u73b0<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">insert<\/span><span class=\"token punctuation\">(<\/span>size_t pos<span class=\"token punctuation\">,<\/span> size_t n<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">char<\/span> ch<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token function\">assert<\/span><span class=\"token punctuation\">(<\/span>pos <span class=\"token operator\">&lt;&#061;<\/span> _size<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>_size <span class=\"token operator\">&#043;<\/span> n <span class=\"token operator\">&gt;<\/span> _capacity<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token function\">reserve<\/span><span class=\"token punctuation\">(<\/span>_size <span class=\"token operator\">&#043;<\/span> n<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\nsize_t end <span class=\"token operator\">&#061;<\/span> _size<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span>end <span class=\"token operator\">&gt;&#061;<\/span> pos <span class=\"token operator\">&amp;&amp;<\/span> end <span class=\"token operator\">!&#061;<\/span> npos<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token comment\">\/\/\u5f53end&#061;&#061;-1\u65f6&#xff0c;\u56e0\u4e3a\u7c7b\u578b\u4e3asize_t \u6240\u4ee5\u4f1a\u53d8\u4e3a\u6574\u6570\u7684\u6700\u5927\u503c<\/span><br \/>\n<span class=\"token comment\">\/\/\u4e5f\u5c31\u662fnpos&#xff0c;\u6240\u4ee5\u591a\u52a0\u4e00\u4e2a\u6761\u4ef6\u63a7\u5236whlie<\/span><br \/>\n_str<span class=\"token punctuation\">[<\/span>end <span class=\"token operator\">&#043;<\/span> n<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> _str<span class=\"token punctuation\">[<\/span>end<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token operator\">&#8212;<\/span>end<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> n<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n_str<span class=\"token punctuation\">[<\/span>i <span class=\"token operator\">&#043;<\/span> pos<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> ch<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n_size <span class=\"token operator\">&#043;&#061;<\/span> n<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">insert<\/span><span class=\"token punctuation\">(<\/span>size_t pos<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">const<\/span> <span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> str<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token function\">assert<\/span><span class=\"token punctuation\">(<\/span>pos <span class=\"token operator\">&lt;&#061;<\/span> _size<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>size_t len <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">strlen<\/span><span class=\"token punctuation\">(<\/span>str<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>len <span class=\"token operator\">&#043;<\/span> _size <span class=\"token operator\">&gt;<\/span> _capacity<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token function\">reserve<\/span><span class=\"token punctuation\">(<\/span>len <span class=\"token operator\">&#043;<\/span> _size<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\nsize_t end <span class=\"token operator\">&#061;<\/span> _size<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span>end <span class=\"token operator\">&gt;&#061;<\/span> pos <span class=\"token operator\">&amp;&amp;<\/span> end <span class=\"token operator\">!&#061;<\/span> npos<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n_str<span class=\"token punctuation\">[<\/span>end <span class=\"token operator\">&#043;<\/span> len<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> _str<span class=\"token punctuation\">[<\/span>end<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token operator\">&#8212;<\/span>end<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span>size_t i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> len<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n_str<span class=\"token punctuation\">[<\/span>pos <span class=\"token operator\">&#043;<\/span> i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> str<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n_size <span class=\"token operator\">&#043;&#061;<\/span> len<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>3.6 \u5220\u9664&#xff08;erase&#xff09;,\u6e05\u7a7a&#xff08;clear&#xff09;<\/h3>\n<ul>\n<li>erase:\u5b9e\u73b0\u7684\u4ece\u67d0\u4e2a\u4f4d\u7f6e\u5f00\u59cb\u5220\u9664&#xff0c;\u5220\u9664\u957f\u5ea6\u4e3a len \u7684\u5b57\u7b26\u3002len\u6709\u4e00\u4e2a\u7f3a\u7701\u53c2\u6570&#xff0c;\u4e3anpos&#xff08;npos\u662f\u4e00\u4e2a\u5f88\u5927\u7684\u6570&#xff0c;\u4e5f\u5c31\u662f\u4e0d\u4f20\u53c2\u7ed9 len \u7684\u8bdd&#xff0c;\u9ed8\u8ba4\u5220\u9664\u5230\u6700\u540e&#xff09;\u3002\u5982\u679c len \u672c\u5c31\u5f88\u5927&#xff0c;\u5220\u9664\u7684\u957f\u5ea6\u8d85\u8fc7\u4ecepos\u5f00\u59cb\u6240\u5269\u4f59\u7684\u957f\u5ea6&#xff0c;\u90a3\u4e48\u9ed8\u8ba4\u4e5f\u662fpos\u540e\u7684\u5220\u9664\u5b8c\u3002<\/li>\n<li>claer:\u4e0eerase\u4e0d\u540c&#xff0c;\u5b83\u662f\u5c06\u6574\u4e2a\u5b57\u7b26\u4e32\u5168\u90e8\u6e05\u7a7a<\/li>\n<\/ul>\n<p><span class=\"token comment\">\/\/erase\u6a21\u62df\u5b9e\u73b0<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">erase<\/span><span class=\"token punctuation\">(<\/span>size_t pos<span class=\"token punctuation\">,<\/span> size_t len <span class=\"token operator\">&#061;<\/span> npos<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token function\">assert<\/span><span class=\"token punctuation\">(<\/span>pos <span class=\"token operator\">&lt;<\/span> _size<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>len <span class=\"token operator\">&#061;&#061;<\/span> npos <span class=\"token operator\">||<\/span> len <span class=\"token operator\">&#043;<\/span> pos <span class=\"token operator\">&gt;&#061;<\/span> _size<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n_str<span class=\"token punctuation\">[<\/span>pos<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token char\">&#039;\\\\0&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n_size <span class=\"token operator\">&#061;<\/span> pos<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">else<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\nsize_t end <span class=\"token operator\">&#061;<\/span> len <span class=\"token operator\">&#043;<\/span> pos<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span>end <span class=\"token operator\">&lt;&#061;<\/span> _size<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n_str<span class=\"token punctuation\">[<\/span>pos<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> _str<span class=\"token punctuation\">[<\/span>end<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n_size <span class=\"token operator\">-&#061;<\/span> len<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token comment\">\/\/clear\u6a21\u62df\u5b9e\u73b0<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">clear<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n_str<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token char\">&#039;\\\\0&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n_size <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>3.7 \u67e5\u627e&#xff08;find&#xff09;<\/h3>\n<p>\u4ecepos\u4f4d\u7f6e\u5f00\u59cb\u67e5\u627e&#xff0c;\u67e5\u627e\u7684\u5185\u5bb9\u53ef\u80fd\u662f\u4e00\u4e2a\u5b57\u7b26&#xff0c;\u4e5f\u53ef\u80fd\u662f\u4e00\u4e2a\u5b50\u4e32\u3002\u5982\u679c\u627e\u5230&#xff0c;\u5219\u8fd4\u56de\u5176\u4e0b\u6807\u3002\u6ca1\u627e\u5230\u5c31\u8fd4\u56denpos\u3002<\/p>\n<p><span class=\"token comment\">\/\/find\u6a21\u62df\u5b9e\u73b0<\/span><br \/>\nsize_t <span class=\"token function\">find<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">char<\/span> ch<span class=\"token punctuation\">,<\/span> size_t pos <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token function\">assert<\/span><span class=\"token punctuation\">(<\/span>pos <span class=\"token operator\">&lt;<\/span> _size<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span>size_t i <span class=\"token operator\">&#061;<\/span> pos<span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> _size<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>_str<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;&#061;<\/span> ch<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">return<\/span> i<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">return<\/span> npos<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\nsize_t <span class=\"token function\">find<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> <span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> str<span class=\"token punctuation\">,<\/span> size_t pos <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token function\">assert<\/span><span class=\"token punctuation\">(<\/span>pos <span class=\"token operator\">&lt;<\/span> _size<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">const<\/span> <span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> ptr <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">strstr<\/span><span class=\"token punctuation\">(<\/span>_str <span class=\"token operator\">&#043;<\/span> pos<span class=\"token punctuation\">,<\/span> str<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>ptr<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">return<\/span> ptr <span class=\"token operator\">&#8211;<\/span> _str<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">else<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">return<\/span> npos<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token punctuation\">}<\/span><\/p>\n<h3>3.8 \u8fd4\u56de\u5b50\u4e32&#xff08;substr&#xff09;<\/h3>\n<p>\u4ece\u67d0\u4e2a\u4f4d\u7f6e\u5f00\u59cb\u67e5\u627e&#xff0c;\u67e5\u627e\u957f\u5ea6\u4e3a len \u7684\u5b57\u7b26\u3002len\u6709\u4e00\u4e2a\u7f3a\u7701\u53c2\u6570&#xff0c;\u4e3anpos&#xff08;npos\u662f\u4e00\u4e2a\u5f88\u5927\u7684\u6570&#xff0c;\u4e5f\u5c31\u662f\u4e0d\u4f20\u53c2\u7ed9 len \u7684\u8bdd&#xff0c;\u9ed8\u8ba4\u8fd4\u56de\u5230\u6700\u540e&#xff09;\u3002\u5982\u679c len \u672c\u5c31\u5f88\u5927&#xff0c;\u8fd4\u56de\u5b50\u4e32\u7684\u957f\u5ea6\u8d85\u8fc7\u4ecepos\u5f00\u59cb\u6240\u5269\u4f59\u7684\u957f\u5ea6&#xff0c;\u90a3\u4e48\u9ed8\u8ba4\u4e5f\u662fpos\u540e\u7684\u5b50\u4e32\u5168\u90e8\u8fd4\u56de\u3002<\/p>\n<p><span class=\"token comment\">\/\/substr\u6a21\u62df\u5b9e\u73b0<\/span><br \/>\nstring <span class=\"token function\">substr<\/span><span class=\"token punctuation\">(<\/span>size_t pos <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> size_t len <span class=\"token operator\">&#061;<\/span> npos<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token function\">assert<\/span><span class=\"token punctuation\">(<\/span>pos <span class=\"token operator\">&lt;<\/span> _size<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>size_t n <span class=\"token operator\">&#061;<\/span> len<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>len <span class=\"token operator\">&#061;&#061;<\/span> npos <span class=\"token operator\">||<\/span> len <span class=\"token operator\">&#043;<\/span> pos <span class=\"token operator\">&gt;&#061;<\/span>_size<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\nn <span class=\"token operator\">&#061;<\/span> _size <span class=\"token operator\">&#8211;<\/span> pos<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>string tmp<span class=\"token punctuation\">;<\/span><br \/>\ntmp<span class=\"token punctuation\">.<\/span><span class=\"token function\">reserve<\/span><span class=\"token punctuation\">(<\/span>n<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span>size_t i <span class=\"token operator\">&#061;<\/span> pos<span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> pos <span class=\"token operator\">&#043;<\/span> n<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\ntmp <span class=\"token operator\">&#043;&#061;<\/span> _str<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">return<\/span> tmp<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>3.9 \u6bd4\u8f83\u7b26\u53f7&#xff08;&lt;,&gt;,&#061;&#061;,&lt;&#061;,&gt;&#061;,!&#061;&#xff09;<\/h3>\n<p>\u5b57\u7b26\u4e32\u7684\u6bd4\u8f83\u5e76\u975e\u6bd4\u8f83\u5176\u957f\u5ea6&#xff0c;\u800c\u662f\u4e0e\u5176\u76f8\u540c\u4f4d\u7f6e\u5b57\u7b26\u7684\u5927\u5c0f\u6709\u5173&#xff0c;\u4e5f\u5c31\u662f\u6211\u4eec\u6240\u8bf4\u7684\u5b57\u5178\u5e8f\u3002\u6211\u4eec\u8fd9\u91cc\u53ea\u9700\u8981\u5b9e\u73b0\u5176\u4e2d\u7684\u4e24\u4e2a&#xff0c;\u5176\u4ed6\u5747\u53ef\u590d\u7528\u3002<\/p>\n<p><span class=\"token keyword\">bool<\/span> <span class=\"token keyword\">operator<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> string<span class=\"token operator\">&amp;<\/span> s<span class=\"token punctuation\">)<\/span><span class=\"token keyword\">const<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token comment\">\/\/\u5148\u7528memcmp\u6bd4\u8f83\u4e24\u4e2a\u5b57\u7b26\u4e32\u8f83\u77ed\u7684\u90e8\u5206&#xff08;\u524d\u534a\u6bb5\u957f\u5ea6\u76f8\u7b49\u7684\u90e8\u5206&#xff09;<\/span><br \/>\n<span class=\"token comment\">\/\/\u5982\u679c\u76f8\u7b49&#xff0c;ret\u4e3a0&#xff0c;<\/span><br \/>\n<span class=\"token comment\">\/\/\u5219size\u5c0f\u7684\u5b57\u7b26\u4e32\u5c0f<\/span><br \/>\n<span class=\"token keyword\">int<\/span> ret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">memcmp<\/span><span class=\"token punctuation\">(<\/span>_str<span class=\"token punctuation\">,<\/span> s<span class=\"token punctuation\">.<\/span>_str<span class=\"token punctuation\">,<\/span> _size <span class=\"token operator\">&lt;<\/span> s<span class=\"token punctuation\">.<\/span>_size <span class=\"token operator\">?<\/span> _size <span class=\"token operator\">:<\/span> s<span class=\"token punctuation\">.<\/span>_size<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/ &#034;hello&#034; &#034;hello&#034;   false<\/span><br \/>\n<span class=\"token comment\">\/\/ &#034;helloxx&#034; &#034;hello&#034; false<\/span><br \/>\n<span class=\"token comment\">\/\/ &#034;hello&#034; &#034;helloxx&#034; true<\/span><br \/>\n<span class=\"token keyword\">return<\/span> ret <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span> <span class=\"token operator\">?<\/span> _size <span class=\"token operator\">&lt;<\/span> s<span class=\"token punctuation\">.<\/span>_size <span class=\"token operator\">:<\/span> ret <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">bool<\/span> <span class=\"token keyword\">operator<\/span><span class=\"token operator\">&#061;&#061;<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> string<span class=\"token operator\">&amp;<\/span> s<span class=\"token punctuation\">)<\/span><span class=\"token keyword\">const<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">return<\/span> _size <span class=\"token operator\">&#061;&#061;<\/span> s<span class=\"token punctuation\">.<\/span>_size<br \/>\n<span class=\"token operator\">&amp;&amp;<\/span> <span class=\"token function\">memcmp<\/span><span class=\"token punctuation\">(<\/span>_str<span class=\"token punctuation\">,<\/span> s<span class=\"token punctuation\">.<\/span>_str<span class=\"token punctuation\">,<\/span> _size<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">bool<\/span> <span class=\"token keyword\">operator<\/span><span class=\"token operator\">&lt;&#061;<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> string<span class=\"token operator\">&amp;<\/span> s<span class=\"token punctuation\">)<\/span><span class=\"token keyword\">const<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">return<\/span> <span class=\"token operator\">*<\/span><span class=\"token generic-function\"><span class=\"token function\">this<\/span> <span class=\"token generic class-name\"><span class=\"token operator\">&lt;<\/span> s <span class=\"token operator\">||<\/span> <span class=\"token operator\">*<\/span><span class=\"token keyword\">this<\/span> <span class=\"token operator\">&#061;&#061;<\/span> s<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">bool<\/span> <span class=\"token keyword\">operator<\/span><span class=\"token operator\">&gt;<\/span><\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> string<span class=\"token operator\">&amp;<\/span> s<span class=\"token punctuation\">)<\/span><span class=\"token keyword\">const<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">return<\/span> <span class=\"token operator\">!<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span><span class=\"token keyword\">this<\/span> <span class=\"token operator\">&lt;&#061;<\/span> s<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">bool<\/span> <span class=\"token keyword\">operator<\/span><span class=\"token operator\">&gt;&#061;<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> string<span class=\"token operator\">&amp;<\/span> s<span class=\"token punctuation\">)<\/span><span class=\"token keyword\">const<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">return<\/span> <span class=\"token operator\">!<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span><span class=\"token keyword\">this<\/span> <span class=\"token operator\">&lt;<\/span> s<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">bool<\/span> <span class=\"token keyword\">operator<\/span><span class=\"token operator\">!&#061;<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> string<span class=\"token operator\">&amp;<\/span> s<span class=\"token punctuation\">)<\/span><span class=\"token keyword\">const<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">return<\/span> <span class=\"token operator\">!<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span><span class=\"token keyword\">this<\/span> <span class=\"token operator\">&#061;&#061;<\/span> s<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>3.10 \u8fed\u4ee3\u5668&#xff08;iterator&#xff09;<\/h3>\n<p>\u8fd9\u91cc\u7684begin&#xff08;&#xff09;\u5c31\u662f\u8fd4\u56de\u7684\u5b57\u7b26\u4e32\u7684\u9996\u5143\u7d20\u5730\u5740&#xff0c;end&#xff08;&#xff09;\u8fd4\u56de\u7684\u662f\u5b57\u7b26\u4e32\u6700\u540e\u4e00\u4e2a\u5143\u7d20\u7684\u540e\u4e00\u4e2a\u5730\u5740&#xff01;<\/p>\n<p><span class=\"token keyword\">public<\/span><span class=\"token operator\">:<\/span><br \/>\n<span class=\"token keyword\">typedef<\/span> <span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> iterator<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">typedef<\/span> <span class=\"token keyword\">const<\/span> <span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> const_iterator<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/\u8fed\u4ee3\u5668\u6a21\u62df\u5b9e\u73b0<\/span><br \/>\niterator <span class=\"token function\">begin<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">return<\/span> _str<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>iterator <span class=\"token function\">end<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">return<\/span> _str <span class=\"token operator\">&#043;<\/span> _size<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>const_iterator <span class=\"token function\">begin<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">const<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">return<\/span> _str<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>const_iterator <span class=\"token function\">end<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">const<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">return<\/span> _str <span class=\"token operator\">&#043;<\/span> _size<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>3.11 \u6d41\u63d2\u5165&#xff08;&lt;&lt;&#xff09;&#xff0c;\u6d41\u63d0\u53d6&#xff08;&gt;&gt;&#xff09;<\/h3>\n<p><span class=\"token comment\">\/\/\u6d41\u63d2\u5165&#xff0c;\u6d41\u63d0\u53d6<\/span><br \/>\nostream<span class=\"token operator\">&amp;<\/span> <span class=\"token keyword\">operator<\/span><span class=\"token operator\">&lt;&lt;<\/span><span class=\"token punctuation\">(<\/span>ostream<span class=\"token operator\">&amp;<\/span> out<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">const<\/span> string<span class=\"token operator\">&amp;<\/span> s<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">auto<\/span> ch <span class=\"token operator\">:<\/span> s<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token generic-function\"><span class=\"token function\">out<\/span> <span class=\"token generic class-name\"><span class=\"token operator\">&lt;&lt;<\/span> ch<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">return<\/span> out<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\nistream<span class=\"token operator\">&amp;<\/span> <span class=\"token keyword\">operator<\/span><span class=\"token operator\">&gt;&gt;<\/span><\/span><\/span><span class=\"token punctuation\">(<\/span>istream<span class=\"token operator\">&amp;<\/span> in<span class=\"token punctuation\">,<\/span> string<span class=\"token operator\">&amp;<\/span> s<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token comment\">\/\/\u8fd9\u91cc\u6211\u4eec\u91c7\u7528\u4e00\u4e2a\u4e00\u4e2a\u5b57\u7b26\u7684\u8f93\u5165<\/span><\/p>\n<p><span class=\"token comment\">\/\/\u8986\u76d6\u4e4b\u524d\u8f93\u5165\u6570\u636e<\/span><br \/>\ns<span class=\"token punctuation\">.<\/span><span class=\"token function\">clear<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">char<\/span> ch <span class=\"token operator\">&#061;<\/span> in<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/\u5904\u7406\u524d\u7f13\u51b2\u533a\u524d\u9762\u7684\u7a7a\u683c\u6216\u8005\u6362\u884c<\/span><br \/>\n<span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span>ch <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token char\">&#039; &#039;<\/span> <span class=\"token operator\">||<\/span> ch <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token char\">&#039;\\\\n&#039;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\nch <span class=\"token operator\">&#061;<\/span> in<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/\u6bcf\u6b21\u8f93\u5165\u7684\u5b57\u7b26\u5927\u5c0f\u4e0d\u786e\u5b9a&#xff0c;\u5982\u679c\u63d0\u524d\u7528reserve\u5f00\u7a7a\u95f4\u53ef\u80fd\u5bfc\u81f4\u6d6a\u8d39<\/span><br \/>\n<span class=\"token comment\">\/\/\u56e0\u6b64\u5148\u7528\u4e00\u4e2a\u5927\u5c0f\u4e3a128\u5b57\u7b26\u6570\u7ec4\u5b58\u8f93\u5165\u7684\u5b57\u7b26&#xff0c;\u5f53\u6570\u7ec4\u6ee1\u65f6\u518d\u653e\u5165string<\/span><br \/>\n<span class=\"token keyword\">char<\/span> buff<span class=\"token punctuation\">[<\/span><span class=\"token number\">128<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span>ch <span class=\"token operator\">!&#061;<\/span> <span class=\"token char\">&#039; &#039;<\/span> <span class=\"token operator\">&amp;&amp;<\/span> ch <span class=\"token operator\">!&#061;<\/span> <span class=\"token char\">&#039;\\\\n&#039;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\nbuff<span class=\"token punctuation\">[<\/span>i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> ch<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>i <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">127<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\nbuff<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token char\">&#039;\\\\0&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\ns <span class=\"token operator\">&#043;&#061;<\/span> buff<span class=\"token punctuation\">;<\/span><br \/>\ni <span class=\"token operator\">&#061;<\/span> <span 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