std::regex<\/p>\n
- \n
- \n
\u8868\u8fbe\u5f0f：std::regex r(const std::string& pattern, flag_type flags = ECMAScript);<\/p>\n<\/li>\n
- \n
\u53c2\u6570：pattern\u00a0\u4e3a\u6b63\u5219\u8868\u8fbe\u5f0f\u5b57\u7b26\u4e32；flags\u00a0\u53ef\u9009\u8bed\u6cd5\u9009\u9879（\u5982\u00a0ECMAScript\u3001basic\u3001extended\u3001icase\u00a0\u7b49）\u3002<\/p>\n<\/li>\n
- \n
\u4f5c\u7528：\u7f16\u8bd1\u6b63\u5219\u8868\u8fbe\u5f0f，\u5b58\u50a8\u4e3a\u4e00\u4e2a\u53ef\u7528\u7684\u6b63\u5219\u5bf9\u8c61\u3002<\/p>\n<\/li>\n<\/ul>\n<\/li>\n
- \n
std::regex_match<\/p>\n
- \n
- \n
\u8868\u8fbe\u5f0f：bool regex_match(const std::string& s, std::smatch& m, const std::regex& r);<\/p>\n<\/li>\n
- \n
\u53c2\u6570：s\u00a0\u4e3a\u6e90\u5b57\u7b26\u4e32；m\u00a0\u7528\u4e8e\u5b58\u50a8\u5339\u914d\u7ed3\u679c（\u5b50\u5339\u914d\u7ec4）；r\u00a0\u4e3a\u5df2\u7f16\u8bd1\u7684\u6b63\u5219\u5bf9\u8c61\u3002<\/p>\n<\/li>\n
- \n
\u4f5c\u7528：\u68c0\u67e5\u6574\u4e2a\u5b57\u7b26\u4e32\u662f\u5426\u5b8c\u5168\u5339\u914d\u6b63\u5219\u8868\u8fbe\u5f0f（\u4ece\u5f00\u5934\u5230\u7ed3\u5c3e\u5fc5\u987b\u5b8c\u5168\u7b26\u5408）\u3002<\/p>\n<\/li>\n<\/ul>\n<\/li>\n
- \n
std::regex_search<\/p>\n
- \n
- \n
\u8868\u8fbe\u5f0f：bool regex_search(const std::string& s, std::smatch& m, const std::regex& r);<\/p>\n<\/li>\n
- \n
\u53c2\u6570：\u540c\u4e0a，m\u00a0\u5b58\u50a8\u9996\u6b21\u5339\u914d\u7684\u5b50\u4e32\u53ca\u6355\u83b7\u7ec4\u3002<\/p>\n<\/li>\n
- \n
\u4f5c\u7528：\u5728\u5b57\u7b26\u4e32\u4e2d\u641c\u7d22\u7b2c\u4e00\u4e2a\u5339\u914d\u6b63\u5219\u8868\u8fbe\u5f0f\u7684\u5b50\u5e8f\u5217（\u4e0d\u9700\u8981\u5168\u4e32\u5339\u914d）\u3002<\/p>\n<\/li>\n<\/ul>\n<\/li>\n
- \n
std::regex_replace<\/p>\n
- \n
- \n
\u8868\u8fbe\u5f0f：std::string regex_replace(const std::string& s, const std::regex& r, const std::string& fmt);<\/p>\n<\/li>\n
- \n
\u53c2\u6570：s\u00a0\u6e90\u5b57\u7b26\u4e32；r\u00a0\u6b63\u5219\u5bf9\u8c61；fmt\u00a0\u66ff\u6362\u683c\u5f0f\u5b57\u7b26\u4e32（\u53ef\u7528\u00a0$1\u3001$2\u00a0\u5f15\u7528\u6355\u83b7\u7ec4）\u3002<\/p>\n<\/li>\n
- \n
\u4f5c\u7528：\u67e5\u627e\u6240\u6709\u5339\u914d\u6b63\u5219\u7684\u5b50\u4e32，\u5e76\u7528\u00a0fmt\u00a0\u66ff\u6362，\u8fd4\u56de\u65b0\u5b57\u7b26\u4e32\u3002<\/p>\n<\/li>\n<\/ul>\n<\/li>\n
- \n
std::sregex_iterator<\/p>\n
- \n
- \n
\u8868\u8fbe\u5f0f：std::sregex_iterator it(s.begin(), s.end(), r);<\/p>\n<\/li>\n
- \n
\u53c2\u6570：\u8fed\u4ee3\u5668\u8303\u56f4（\u5b57\u7b26\u4e32\u9996\u5c3e）\u548c\u6b63\u5219\u5bf9\u8c61\u3002<\/p>\n<\/li>\n
- \n
\u4f5c\u7528：\u8fed\u4ee3\u904d\u5386\u5b57\u7b26\u4e32\u4e2d\u6240\u6709\u5339\u914d\u7684\u5b50\u4e32，\u6bcf\u6b21\u89e3\u5f15\u7528\u5f97\u5230\u00a0std::smatch\u00a0\u5bf9\u8c61，\u7528\u4e8e\u6279\u91cf\u5904\u7406\u5339\u914d\u3002<\/p>\n<\/li>\n<\/ul>\n<\/li>\n
\u00a0 \u00a0 \u00a0 \u00a0 \u793a\u4f8b：<\/p>\n
#include <iostream>
\n#include <regex>
\n#include <string><\/p>\nint main()
\n{
\n std::string text = "Contact: alice@example.com, bob@test.org";
\n std::regex email_pattern(R"([a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\\\\.[a-zA-Z]{2,})");<\/p>\n\/\/ 1. regex_match：\u8981\u6c42\u6574\u4e2a\u5b57\u7b26\u4e32\u5b8c\u5168\u5339\u914d
\n std::string single = "user@domain.com";
\n if (std::regex_match(single, email_pattern))
\n std::cout << "Full match: " << single << " is an email\\\\n";
\n else
\n std::cout << "Not a full match\\\\n";<\/p>\n\/\/ 2. regex_search：\u67e5\u627e\u7b2c\u4e00\u4e2a\u5339\u914d\u7684\u5b50\u4e32
\n std::smatch match;
\n if (std::regex_search(text, match, email_pattern))
\n std::cout << "First email found: " << match[0] << "\\\\n";<\/p>\n\/\/ 3. regex_replace：\u66ff\u6362\u6240\u6709\u5339\u914d\u9879
\n std::string replaced = std::regex_replace(text, email_pattern, "[EMAIL]");
\n std::cout << "Replaced text: " << replaced << "\\\\n";<\/p>\n\/\/ 4. sregex_iterator：\u904d\u5386\u6240\u6709\u5339\u914d\u9879
\n std::cout << "All emails: ";
\n for (std::sregex_iterator it(text.begin(), text.end(), email_pattern), end; it != end; ++it)
\n std::cout << it->str() << " ";
\n std::cout << "\\\\n";<\/p>\nreturn 0;
\n} <\/p>\n\u00a0 \u00a0 \u00a0 \u00a0 \u7ed3\u679c\u4e3a：<\/p>\n
![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/07\/20260726095659-6a65d9eb0f4c4.png\")
<\/p>\n\u00a0 \u00a0 \u00a0 \u00a0 \u6b63\u5219\u8868\u8fbe\u5f0f\u89e3\u6790\u5904\u7406HTTP\u8bf7\u6c42<\/h3>\n
#include <iostream>
\n#include <regex>
\n#include <string><\/p>\nint main()
\n{
\n \/\/ \u793a\u4f8b HTTP \u8bf7\u6c42\u884c
\n std::string request_line = "GET \/api\/users?id=123&name=john HTTP\/1.1";<\/p>\n\/\/ \u6b63\u5219\u8868\u8fbe\u5f0f：
\n \/\/ \u5206\u7ec41: \u65b9\u6cd5 (\u5927\u5199\u5b57\u6bcd)
\n \/\/ \u5206\u7ec42: \u8def\u5f84 (\u975e\u7a7a\u767d\u4e14\u4e0d\u542b '?')
\n \/\/ \u5206\u7ec43: \u67e5\u8be2\u5b57\u7b26\u4e32 (\u53ef\u9009，'?' \u540e\u975e\u7a7a\u767d\u5b57\u7b26)
\n \/\/ \u5206\u7ec44: HTTP\u7248\u672c (HTTP\/x.x)
\n std::regex pattern(R"(^([A-Z]+)\\\\s+([^\\\\s?]+)(?:\\\\?([^\\\\s]+))?\\\\s+(HTTP\/\\\\d\\\\.\\\\d)$)");<\/p>\nstd::smatch matches;
\n if (std::regex_match(request_line, matches, pattern)) {
\n std::cout << "\u5b8c\u6574\u8bf7\u6c42\u884c: " << request_line << "\\\\n\\\\n";
\n std::cout << "\u8bf7\u6c42\u65b9\u6cd5: " << matches[1] << std::endl;
\n std::cout << "\u8bf7\u6c42\u8def\u5f84: " << matches[2] << std::endl;<\/p>\n\/\/ \u67e5\u8be2\u5b57\u7b26\u4e32\u53ef\u80fd\u4e0d\u5b58\u5728
\n if (matches[3].matched)
\n std::cout << "\u67e5\u8be2\u5b57\u7b26\u4e32: " << matches[3] << std::endl;
\n else
\n std::cout << "\u67e5\u8be2\u5b57\u7b26\u4e32: (\u65e0)" << std::endl;<\/p>\nstd::cout << "HTTP\u7248\u672c: " << matches[4] << std::endl;
\n } else {
\n std::cerr << "\u8bf7\u6c42\u884c\u683c\u5f0f\u4e0d\u5339\u914d" << std::endl;
\n }<\/p>\nreturn 0;
\n} <\/p>\n\u7ed3\u679c\u4e3a：<\/p>\n
![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/07\/20260726095659-6a65d9eb26f56.png\")
<\/p>\nany\u7c7b<\/h2>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u6bcf\u4e00\u4e2aConnection\u5bf9\u8fde\u63a5\u8fdb\u884c\u7ba1\u7406，\u6700\u7ec8\u90fd\u4e0d\u53ef\u907f\u514d\u9700\u8981\u6d89\u53ca\u5230\u5e94\u7528\u5c42\u534f\u8bae\u7684\u5904\u7406，\u56e0\u6b64\u5728Connection\u4e2d\u9700\u8981\u8bbe\u7f6e\u534f\u8bae\u5904\u7406\u7684\u4e0a\u4e0b\u6587\u6765\u63a7\u5236\u5904\u7406\u8282\u594f\u3002\u4f46\u662f\u5e94\u7528\u5c42\u534f\u8bae\u5343\u5343\u4e07，\u4e3a\u4e86\u964d\u4f4e\u8026\u5408\u5ea6，\u8fd9\u4e2a\u534f\u8bae\u63a5\u6536\u89e3\u6790\u4e0a\u4e0b\u6587\u5c31\u4e0d\u80fd\u6709\u660e\u663e\u7684\u534f\u8bae\u503e\u5411，\u5b83\u53ef\u4ee5\u662f\u4efb\u610f\u534f\u8bae\u7684\u4e0a\u4e0b\u6587\u4fe1\u606f，\u56e0\u6b64\u5c31\u9700\u8981\u4e00\u4e2a\u901a\u7528\u7684\u7c7b\u578b\u6765\u4fdd\u5b58\u5404\u79cd\u4e0d\u540c\u7684\u6570\u636e\u7ed3\u6784\u3002 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u5728C\u8bed\u8a00\u4e2d，\u901a\u7528\u7c7b\u578b\u53ef\u4ee5\u4f7f\u7528void*\u6765\u7ba1\u7406，\u4f46\u662f\u5728C++\u4e2d，boost\u5e93\u548cC++17\u7ed9\u6211\u4eec\u63d0\u4f9b\u4e86\u4e00\u4e2a\u901a\u7528\u7c7b\u578bany\u6765\u7075\u6d3b\u4f7f\u7528，\u5982\u679c\u8003\u8651\u589e\u52a0\u4ee3\u7801\u7684\u79fb\u690d\u6027，\u5c3d\u91cf\u51cf\u5c11\u7b2c\u4e09\u65b9\u5e93\u7684\u4f9d\u8d56，\u5219\u53ef\u4ee5\u4f7f\u7528C++17\u7279\u6027\u4e2d\u7684any，\u6216\u8005\u81ea\u5df1\u6765\u5b9e\u73b0\u3002<\/p>\n
\u00a0 \u00a0 \u00a0 \u00a0 <any>\u7c7b\u4ecb\u7ecd<\/h3>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u9ed8\u8ba4\u6784\u9020\u4e0e\u503c\u6784\u9020 \/ \u8d4b\u503c<\/h4>\n
\u8868\u8fbe\u5f0f：\u00a0std::any a;\u00a0\u6216\u00a0std::any a = \u503c; \u53c2\u6570：\u00a0\u65e0\u53c2\u6784\u9020\u5f97\u5230\u7a7a\u5bf9\u8c61；\u82e5\u4f20\u5165\u4efb\u610f\u53ef\u62f7\u8d1d\u7c7b\u578b\u00a0T\u00a0\u7684\u503c，\u5219\u4ece\u8be5\u503c\u6784\u9020\u6216\u8d4b\u503c\u3002 \u4f5c\u7528：\u00a0\u521b\u5efa\u4e00\u4e2a\u00a0std::any\u00a0\u5bb9\u5668\u3002\u9ed8\u8ba4\u6784\u9020\u65f6\u4e0d\u542b\u4efb\u4f55\u503c（has_value()\u00a0\u8fd4\u56de\u00a0false）\u3002\u4f20\u5165\u5177\u4f53\u503c\u65f6，\u5185\u90e8\u4f1a\u5b58\u50a8\u4e00\u4efd\u00a0T\u00a0\u7684\u62f7\u8d1d（\u6216\u901a\u8fc7\u79fb\u52a8\u8bed\u4e49\u63a5\u7ba1\u8d44\u6e90），\u6b64\u540e\u8be5\u00a0any\u00a0\u5bf9\u8c61\u4fbf\u62e5\u6709\u8be5\u7c7b\u578b\u7684\u6709\u6548\u6570\u636e\u3002<\/p>\n
\u00a0std::make_any<T>(args…)<\/h4>\n
\u8868\u8fbe\u5f0f：\u00a0auto a = std::make_any<T>(\u6784\u9020\u53c2\u6570…); \u53c2\u6570：\u00a0\u76ee\u6807\u7c7b\u578b\u00a0T\u00a0\u53ca\u5176\u6784\u9020\u51fd\u6570\u6240\u9700\u7684\u5b9e\u53c2\u5217\u8868\u3002 \u4f5c\u7528：\u00a0\u76f4\u63a5\u5728\u00a0any\u00a0\u5185\u90e8\u539f\u5730\u6784\u9020\u00a0T\u00a0\u7c7b\u578b\u7684\u5bf9\u8c61，\u5b8c\u5168\u907f\u514d\u4e34\u65f6\u5bf9\u8c61\u7684\u4ea7\u751f\u4e0e\u591a\u4f59\u7684\u62f7\u8d1d\/\u79fb\u52a8\u5f00\u9500\u3002\u4e0e\u5148\u6784\u9020\u4e34\u65f6\u5bf9\u8c61\u518d\u5b58\u5165\u00a0any\u00a0\u76f8\u6bd4，\u5b83\u66f4\u9ad8\u6548\u4e14\u5f02\u5e38\u5b89\u5168\u3002<\/p>\n
\u00a0has_value()<\/h4>\n
\u8868\u8fbe\u5f0f：\u00a0a.has_value() \u53c2\u6570：\u00a0\u65e0\u3002 \u4f5c\u7528：\u00a0\u8fd4\u56de\u5e03\u5c14\u503c，\u6307\u793a\u5f53\u524d\u00a0any\u00a0\u5bf9\u8c61\u662f\u5426\u6301\u6709\u6709\u6548\u503c（\u5373\u975e\u7a7a）\u3002\u7a7a\u00a0any\u00a0\u901a\u5e38\u7531\u9ed8\u8ba4\u6784\u9020\u3001\u8c03\u7528\u00a0reset()\u00a0\u6216\u88ab\u79fb\u8d70\u503c\u4ea7\u751f\u3002<\/p>\n
\u00a0 type()<\/h4>\n
\u8868\u8fbe\u5f0f：\u00a0a.type() \u53c2\u6570：\u00a0\u65e0\u3002 \u4f5c\u7528：\u00a0\u8fd4\u56de\u00a0const std::type_info&，\u4ee3\u8868\u5f53\u524d\u6240\u5b58\u50a8\u5bf9\u8c61\u7684\u51c6\u786e\u7c7b\u578b\u3002\u82e5\u00a0any\u00a0\u4e3a\u7a7a，\u5219\u8fd4\u56de\u00a0typeid(void)\u3002\u8be5\u63a5\u53e3\u662f\u8fdb\u884c\u7c7b\u578b\u5b89\u5168\u68c0\u67e5\u7684\u57fa\u7840，\u5e38\u4e0e\u00a0any_cast\u00a0\u7684\u6307\u9488\u5f62\u5f0f\u914d\u5408\u4f7f\u7528\u3002<\/p>\n
\u00a0std::any_cast<T><\/h4>\n
\u8868\u8fbe\u5f0f：\u00a0\u5b58\u5728\u4e24\u79cd\u91cd\u8f7d\u5f62\u5f0f：<\/p>\n
- \n
- \n
\u5f15\u7528\u5f62\u5f0f：std::any_cast<T>(a)<\/p>\n<\/li>\n
- \n
\u6307\u9488\u5f62\u5f0f：std::any_cast<T>(&a) \u53c2\u6570：\u00a0\u524d\u8005\u63a5\u53d7\u00a0any\u00a0\u5bf9\u8c61\u7684\u5f15\u7528；\u540e\u8005\u63a5\u53d7\u00a0any\u00a0\u5bf9\u8c61\u7684\u6307\u9488\u3002 \u4f5c\u7528：\u00a0\u63d0\u53d6\u00a0any\u00a0\u4e2d\u5b58\u50a8\u7684\u503c\u3002<\/p>\n<\/li>\n
- \n
\u5f15\u7528\u5f62\u5f0f：\u82e5\u5b58\u50a8\u7c7b\u578b\u4e0e\u00a0T\u00a0\u4e0d\u5339\u914d，\u629b\u51fa\u00a0std::bad_any_cast\u00a0\u5f02\u5e38\u3002<\/p>\n<\/li>\n
- \n
\u6307\u9488\u5f62\u5f0f：\u82e5\u5b58\u50a8\u7c7b\u578b\u4e0e\u00a0T\u00a0\u4e0d\u5339\u914d，\u8fd4\u56de\u00a0nullptr；\u5339\u914d\u5219\u8fd4\u56de\u6307\u5411\u5185\u90e8\u5b58\u50a8\u5bf9\u8c61\u7684\u6307\u9488\u3002\u63a8\u8350\u4f18\u5148\u4f7f\u7528\u6307\u9488\u5f62\u5f0f\u8fdb\u884c\u5b89\u5168\u8bbf\u95ee\u3002<\/p>\n<\/li>\n<\/ul>\n
\u00a0emplace<T>(args…)<\/h4>\n
\u8868\u8fbe\u5f0f：\u00a0a.emplace<T>(\u6784\u9020\u53c2\u6570…); \u53c2\u6570：\u00a0\u76ee\u6807\u7c7b\u578b\u00a0T\u00a0\u53ca\u5176\u6784\u9020\u53c2\u6570\u3002 \u4f5c\u7528：\u00a0\u9500\u6bc1\u5f53\u524d\u5b58\u50a8\u7684\u4efb\u4f55\u65e7\u503c（\u5982\u679c\u6709），\u7136\u540e\u5728\u539f\u5730\u6784\u9020\u4e00\u4e2a\u65b0\u7684\u00a0T\u00a0\u7c7b\u578b\u5bf9\u8c61\u3002\u5b83\u907f\u514d\u4e86\u5148\u6784\u9020\u4e34\u65f6\u503c\u518d\u8d4b\u503c\u7684\u4e2d\u95f4\u6b65\u9aa4，\u4e14\u80fd\u590d\u7528\u5df2\u5206\u914d\u7684\u5185\u5b58（\u5982\u679c\u5b9e\u73b0\u652f\u6301），\u63d0\u9ad8\u8fd0\u884c\u671f\u53d8\u66f4\u7c7b\u578b\u65f6\u7684\u6548\u7387\u3002<\/p>\n
\u00a0reset()<\/h4>\n
\u8868\u8fbe\u5f0f：\u00a0a.reset(); \u53c2\u6570：\u00a0\u65e0\u3002 \u4f5c\u7528：\u00a0\u9500\u6bc1\u5f53\u524d\u5b58\u50a8\u7684\u5bf9\u8c61（\u8c03\u7528\u5176\u6790\u6784\u51fd\u6570），\u5e76\u5c06\u00a0any\u00a0\u5bf9\u8c61\u91cd\u7f6e\u4e3a\u7a7a\u72b6\u6001\u3002\u8c03\u7528\u540e\u00a0has_value()\u00a0\u5c06\u8fd4\u56de\u00a0false\u3002\u8be5\u64cd\u4f5c\u4e0d\u4f1a\u5f71\u54cd\u00a0any\u00a0\u5bf9\u8c61\u672c\u8eab\u7684\u5b58\u50a8\u7a7a\u95f4，\u4ec5\u662f\u6e05\u7a7a\u5176\u5185\u5bb9\u3002<\/p>\n
\u00a0\u00a0swap()<\/h4>\n
\u8868\u8fbe\u5f0f：\u00a0a1.swap(a2);\u00a0\u6216\u00a0std::swap(a1, a2); \u53c2\u6570：\u00a0\u53e6\u4e00\u4e2a\u540c\u7c7b\u578b\u7684\u00a0std::any\u00a0\u5bf9\u8c61\u3002 \u4f5c\u7528：\u00a0\u4ea4\u6362\u4e24\u4e2a\u00a0any\u00a0\u5bb9\u5668\u6240\u6301\u6709\u7684\u503c\u4ee5\u53ca\u5b83\u4eec\u7684\u72b6\u6001\u3002\u8be5\u64cd\u4f5c\u662f\u9ad8\u6548\u7684，\u901a\u5e38\u4ec5\u4ea4\u6362\u5185\u90e8\u6307\u9488\u6216\u63a7\u5236\u5757，\u4e0d\u6d89\u53ca\u6240\u5b58\u50a8\u7c7b\u578b\u7684\u62f7\u8d1d\u6216\u79fb\u52a8\u6784\u9020\u3002<\/p>\n
\u00a0 \u00a0 \u00a0 \u00a0 \u793a\u4f8b\u4ee3\u7801<\/p>\n
#include <any>
\n#include <iostream>
\n#include <string>
\n#include <vector><\/p>\nint main()
\n{
\n \/\/ 1. \u9ed8\u8ba4\u6784\u9020（\u7a7a any）
\n std::any a;
\n std::cout << "1. \u9ed8\u8ba4\u6784\u9020\u540e has_value(): " << a.has_value() << '\\\\n';<\/p>\n\/\/ 2. \u503c\u6784\u9020：\u5b58\u5165 int
\n std::any b = 42; \/\/ \u9690\u5f0f\u8f6c\u6362\u81ea int
\n std::any c(std::string("hello")); \/\/ \u663e\u5f0f\u6784\u9020
\n std::cout << "2. \u5b58\u5165 int: " << std::any_cast<int>(b) << '\\\\n';<\/p>\n\/\/ 3. std::make_any：\u539f\u5730\u6784\u9020 vector，\u907f\u514d\u4e34\u65f6\u5bf9\u8c61
\n auto d = std::make_any<std::vector<int>>(3, 10); \/\/ \u4e09\u4e2a 10
\n std::cout << "3. make_any<vector>: size="
\n << std::any_cast<std::vector<int>>(d).size() << '\\\\n';<\/p>\n\/\/ 4. has_value() \u548c type()
\n std::cout << "4. d \u662f\u5426\u542b\u6709\u503c? " << d.has_value()
\n << ", \u7c7b\u578b\u540d: " << d.type().name() << '\\\\n';<\/p>\n\/\/ 5. any_cast \u6307\u9488\u5f62\u5f0f（\u5b89\u5168\u8bbf\u95ee）
\n if (auto* ptr = std::any_cast<std::string>(&c))
\n {
\n std::cout << "5. \u6307\u9488\u63d0\u53d6 string: " << *ptr << '\\\\n';
\n }
\n if (auto* ptr = std::any_cast<int>(&c))
\n {
\n \/\/ \u4e0d\u4f1a\u6267\u884c，\u56e0\u4e3a c \u91cc\u662f string
\n }
\n else
\n {
\n std::cout << " \u7c7b\u578b\u4e0d\u5339\u914d，\u8fd4\u56de nullptr\\\\n";
\n }<\/p>\n\/\/ 6. any_cast \u5f15\u7528\u5f62\u5f0f（\u53ef\u80fd\u629b\u5f02\u5e38）
\n try
\n {
\n std::cout << "6. \u5f15\u7528\u63d0\u53d6 int: " << std::any_cast<int>(b) << '\\\\n';
\n \/\/ \u4e0b\u9762\u8fd9\u884c\u5c06\u629b\u51fa std::bad_any_cast
\n \/\/ std::cout << std::any_cast<double>(b);
\n }
\n catch (const std::bad_any_cast& e)
\n {
\n std::cout << " \u6355\u83b7\u5f02\u5e38: " << e.what() << '\\\\n';
\n }<\/p>\n\/\/ 7. emplace：\u9500\u6bc1\u65e7\u503c，\u539f\u5730\u6784\u9020\u65b0\u7c7b\u578b
\n b.emplace<double>(3.14159);
\n std::cout << "7. emplace<double> \u540e: " << std::any_cast<double>(b) << '\\\\n';<\/p>\n\/\/ 8. reset：\u6e05\u7a7a\u5185\u5bb9
\n b.reset();
\n std::cout << "8. reset \u540e has_value(): " << b.has_value() << '\\\\n';<\/p>\n\/\/ 9. swap：\u4ea4\u6362\u4e24\u4e2a any \u7684\u5185\u5bb9
\n std::any x = 100;
\n std::any y = std::string("world");
\n std::cout << "9. \u4ea4\u6362\u524d: x=" << std::any_cast<int>(x)
\n << ", y=" << std::any_cast<std::string>(y) << '\\\\n';
\n x.swap(y);
\n std::cout << " \u4ea4\u6362\u540e: x=" << std::any_cast<std::string>(x)
\n << ", y=" << std::any_cast<int>(y) << '\\\\n';<\/p>\nreturn 0;
\n} <\/p>\n\u7ed3\u679c\u4e3a：<\/p>\n
![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/07\/20260726095659-6a65d9eb382cc.png\")
<\/p>\n\u00a0 \u00a0 \u00a0 \u00a0 \u8bbe\u8ba1\u601d\u60f3<\/h3>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u5d4c\u5957\u4e00\u4e0b，\u8bbe\u8ba1\u4e00\u4e2a\u7c7b，\u4e13\u95e8\u7528\u4e8e\u4fdd\u5b58\u5176\u4ed6\u7c7b\u578b\u7684\u6570\u636e，\u800cAny\u7c7b\u4fdd\u5b58\u7684\u662f\u56fa\u5b9a\u7c7b\u7684\u5bf9\u8c61<\/p>\n
class Any
\n{
\nprivate:
\n class holder
\n {
\n ….
\n };
\n template<class T>
\n class placeholder: holder
\n {
\n T_val I
\n };
\n holder *content;
\n}; <\/p>\nAny\u7c7b\u4e2d，\u4fdd\u5b58\u7684\u662fholder\u7c7b\u7684\u6307\u9488，\u5f53Any\u5bb9\u5668\u9700\u8981\u4fdd\u5b58\u4e00\u4e2a\u6570\u636e\u7684\u65f6\u5019，\u53ea\u9700\u8981\u901a\u8fc7placeholder\u5b50\u7c7b\u5b9e\u4f8b\u5316\u4e00\u4e2a\u7279\u5b9a\u7c7b\u578b\u7684\u5b50\u7c7b\u5bf9\u8c61\u51fa\u6765，\u8ba9\u5b50\u7c7b\u5bf9\u8c61\u4fdd\u5b58\u6570\u636e<\/p>\n
\u00a0 \u00a0 \u00a0 \u00a0 \u6e90\u4ee3\u7801：<\/p>\n
#pragma once<\/p>\n
#include <utility>
\n#include <typeinfo><\/p>\nclass Any
\n{
\nprivate:
\n class holder
\n {
\n public:
\n virtual ~holder() {}
\n virtual const std::type_info& type() const = 0;
\n virtual holder* clone() const = 0;
\n };<\/p>\ntemplate<class T>
\n class placeholder : public holder
\n {
\n public:
\n placeholder(const T& val) : _val(val) {}
\n virtual ~placeholder() = default;<\/p>\nvirtual const std::type_info& type() const override {
\n return typeid(_val);
\n }<\/p>\nvirtual holder* clone() const override {
\n return new placeholder<T>(_val);
\n }<\/p>\nT _val;
\n };<\/p>\nholder* _holder;<\/p>\n
public:
\n Any() : _holder(nullptr) {}<\/p>\ntemplate<class T>
\n Any(const T& val) : _holder(new placeholder<T>(val)) {}<\/p>\nAny(const Any& other)
\n : _holder(other._holder ? other._holder->clone() : nullptr) {}<\/p>\n~Any() {
\n delete _holder;
\n }<\/p>\nAny& Swap(Any& other) noexcept {
\n std::swap(_holder, other._holder);
\n return *this;
\n }<\/p>\n\/\/ \u4ece\u4efb\u610f\u7c7b\u578b\u8d4b\u503c
\n template<class T>
\n Any& operator=(const T& val) {
\n Any(val).Swap(*this);
\n return *this;
\n }<\/p>\n\/\/ \u62f7\u8d1d\u8d4b\u503c\u8fd0\u7b97\u7b26（\u975e\u6a21\u677f）
\n Any& operator=(const Any& other) {
\n Any(other).Swap(*this);
\n return *this;
\n }<\/p>\n\/\/ \u83b7\u53d6\u5b58\u50a8\u503c\u7684\u6307\u9488（\u975e\u5e38\u91cf\u7248\u672c）
\n template<class T>
\n T* get() {
\n if (_holder && typeid(*_holder) == typeid(placeholder<T>)) {
\n return &(static_cast<placeholder<T>*>(_holder)->_val);
\n }
\n return nullptr;
\n }<\/p>\n\/\/ \u83b7\u53d6\u5b58\u50a8\u503c\u7684\u6307\u9488（\u5e38\u91cf\u7248\u672c）
\n template<class T>
\n const T* get() const {
\n if (_holder && typeid(*_holder) == typeid(placeholder<T>)) {
\n return &(static_cast<const placeholder<T>*>(_holder)->_val);
\n }
\n return nullptr;
\n }
\n};<\/p>\n\u00a0 \u00a0 \u00a0 \u00a0 \u6d4b\u8bd5<\/p>\n
#include "MyAny.h"
\n#include <iostream>
\n#include <cassert>
\n#include <string><\/p>\nclass TestCounter
\n{
\npublic:
\n static int construct_count;
\n static int destruct_count;<\/p>\nTestCounter() { construct_count++; }
\n TestCounter(const TestCounter&) { construct_count++; }
\n ~TestCounter() { destruct_count++; }
\n};<\/p>\nint TestCounter::construct_count = 0;
\nint TestCounter::destruct_count = 0;<\/p>\nvoid test_default_constructor()
\n{
\n std::cout << "Test 1: Default Constructor" << std::endl;
\n Any a;
\n assert(a.get<int>() == nullptr);
\n std::cout << " PASSED" << std::endl;
\n}<\/p>\nvoid test_template_constructor()
\n{
\n std::cout << "Test 2: Template Constructor" << std::endl;<\/p>\nAny a1(42);
\n Any a2(3.14);
\n Any a3(std::string("hello"));<\/p>\nstd::cout << " PASSED" << std::endl;
\n}<\/p>\nvoid test_copy_constructor()
\n{
\n std::cout << "Test 3: Copy Constructor" << std::endl;<\/p>\nAny a1(42);
\n Any a2(a1);<\/p>\nAny a3(std::string("test"));
\n Any a4(a3);<\/p>\nstd::cout << " PASSED" << std::endl;
\n}<\/p>\nvoid test_destructor()
\n{
\n std::cout << "Test 4: Destructor" << std::endl;<\/p>\nTestCounter::construct_count = 0;
\n TestCounter::destruct_count = 0;<\/p>\n{
\n Any a{TestCounter()}; \/\/ \u4fee\u590d most vexing parse
\n }<\/p>\nassert(TestCounter::construct_count == TestCounter::destruct_count);
\n std::cout << " PASSED" << std::endl;
\n}<\/p>\nvoid test_swap()
\n{
\n std::cout << "Test 5: Swap Method" << std::endl;<\/p>\nAny a1(42);
\n Any a2(3.14);<\/p>\na1.Swap(a2);<\/p>\n
std::cout << " PASSED" << std::endl;
\n}<\/p>\nvoid test_get()
\n{
\n std::cout << "Test 6: Get Method" << std::endl; <\/p>\nAny a1(42);
\n Any a2(3.14);
\n Any a3(std::string("hello")); <\/p>\nint* p1 = a1.get<int>();
\n double* p2 = a2.get<double>();
\n std::string* p3 = a3.get<std::string>(); <\/p>\nif (p1)
\n {
\n std::cout << " int value: " << *p1 << std::endl;
\n }
\n if (p2) {
\n std::cout << " double value: " << *p2 << std::endl;
\n }
\n if (p3) {
\n std::cout << " string value: " << *p3 << std::endl;
\n } <\/p>\ndouble* wrong_type = a1.get<double>(); \/\/ \u4fee\u6539\u8fd9\u91cc
\n assert(wrong_type == nullptr); <\/p>\nstd::cout << " PASSED" << std::endl;
\n}<\/p>\nvoid test_assignment_operator_value()
\n{
\n std::cout << "Test 7: Assignment Operator (Value)" << std::endl;<\/p>\nAny a1;
\n a1 = 42;<\/p>\nAny a2;
\n a2 = 3.14;<\/p>\nAny a3;
\n a3 = std::string("test");<\/p>\nstd::cout << " PASSED" << std::endl;
\n}<\/p>\nvoid test_assignment_operator_any()
\n{
\n std::cout << "Test 8: Assignment Operator (Any)" << std::endl;<\/p>\nAny a1(42);
\n Any a2;
\n a2 = a1;<\/p>\nAny a3(std::string("hello"));
\n Any a4;
\n a4 = a3;<\/p>\nstd::cout << " PASSED" << std::endl;
\n}<\/p>\nvoid test_self_assignment()
\n{
\n std::cout << "Test 9: Self Assignment" << std::endl;<\/p>\nAny a(42);
\n a = a;<\/p>\nstd::cout << " PASSED" << std::endl;
\n}<\/p>\nvoid test_chained_assignment()
\n{
\n std::cout << "Test 10: Chained Assignment" << std::endl;<\/p>\nAny a1(42);
\n Any a2;
\n Any a3;<\/p>\na3 = a2 = a1;<\/p>\n
std::cout << " PASSED" << std::endl;
\n}<\/p>\nvoid test_multiple_types()
\n{
\n std::cout << "Test 11: Multiple Types" << std::endl;<\/p>\nAny a1(42);
\n Any a2(3.14);
\n Any a3('c');
\n Any a4(true);
\n Any a5(std::string("hello"));<\/p>\nstd::cout << " PASSED" << std::endl;
\n}<\/p>\nvoid test_empty_any()
\n{
\n std::cout << "Test 12: Empty Any Operations" << std::endl;<\/p>\nAny a1;
\n Any a2;<\/p>\na1.Swap(a2);<\/p>\n
Any a3;
\n a3 = a1;<\/p>\nstd::cout << " PASSED" << std::endl;
\n}<\/p>\nvoid test_overwrite_value()
\n{
\n std::cout << "Test 13: Overwrite Value" << std::endl;<\/p>\nAny a(42);
\n a = 3.14;<\/p>\nstd::cout << " PASSED" << std::endl;
\n}<\/p>\nvoid test_complex_type()
\n{
\n std::cout << "Test 14: Complex Type" << std::endl;<\/p>\nstruct Point {
\n int x, y;
\n Point(int x_, int y_) : x(x_), y(y_) {}
\n };<\/p>\nAny a(Point(10, 20));
\n Point* p = a.get<Point>();<\/p>\nif (p) {
\n std::cout << " Point: (" << p->x << ", " << p->y << ")" << std::endl;
\n }<\/p>\nstd::cout << " PASSED" << std::endl;
\n}<\/p>\nvoid test_swap_with_empty()
\n{
\n std::cout << "Test 15: Swap with Empty Any" << std::endl;<\/p>\nAny a1(42);
\n Any a2;<\/p>\na1.Swap(a2);<\/p>\n
std::cout << " PASSED" << std::endl;
\n}<\/p>\nint main()
\n{
\n std::cout << "=== MyAny Unit Tests ===" << std::endl << std::endl;<\/p>\ntest_default_constructor();
\n test_template_constructor();
\n test_copy_constructor();
\n test_destructor();
\n test_swap();
\n test_get();
\n test_assignment_operator_value();
\n test_assignment_operator_any();
\n test_self_assignment();
\n test_chained_assignment();
\n test_multiple_types();
\n test_empty_any();
\n test_overwrite_value();
\n test_complex_type();
\n test_swap_with_empty();<\/p>\nstd::cout << std::endl << "=== All Tests Completed ===" << std::endl;
\n return 0;
\n} <\/p>\n\u00a0 \u00a0 \u00a0 \u00a0 \u7ed3\u679c\u4e3a：<\/p>\n
![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/07\/20260726095659-6a65d9eb51e65.png\")
<\/p>\n<\/p>\n\u00a0 \u00a0 \u00a0 \u00a0 \u672c\u671f\u5185\u5bb9\u5c31\u5230\u8fd9\u91cc\u4e86，\u559c\u6b22\u8bf7\u70b9\u4e2a\u8d5e\u8c22\u8c22<\/p>\n
\u5c01\u9762\u56fe\u81ea\u53d6：<\/p>\n
![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/07\/20260726095659-6a65d9eb99810.jpg\")
<\/p>\n","protected":false},"excerpt":{"rendered":"\u672c\u671f\u6211\u4eec\u63a5\u7740\u6df1\u5165\u9879\u76ee\u7684\u7f16\u5199\u3002 \u76f8\u5173\u4ee3\u7801\u5df2\u7ecf\u4e0a\u4f20\u81f3\u4f5c\u8005\u4e2a\u4ebagitee：\u4effmuduo\u670d\u52a1\u5668: \u672c\u9879\u76ee\u81f4\u529b\u4e8e\u5b9e\u73b0\u4e00\u4e2a\u4eff\u9020muduo\u5e93\u7684\u7b80\u6613\u5e76\u53d1\u670d\u52a1\u5668，\u4e3a\u4e2a\u4eba\u9879\u76ee，\u53c2\u8003\u5373\u53ef\u559c\u6b22\u8bf7\u70b9\u4e2a\u8d5e\u8c22\u8c22
\n\u76ee\u5f55
\n\u6b63\u5219\u8868\u8fbe\u5f0f \u5e93\u7684\u63a5\u53e3\u4ecb\u7ecd\u6b63\u5219\u8868\u8fbe\u5f0f\u89e3\u6790\u5904\u7406HTTP\u8bf7\u6c42
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