{"id":113902,"date":"2026-10-07T21:33:10","date_gmt":"2026-10-07T13:33:10","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/113902.html"},"modified":"2026-10-07T21:33:10","modified_gmt":"2026-10-07T13:33:10","slug":"%e3%80%90c%e9%9d%a2%e8%af%95%e3%80%91%e6%89%8b%e5%86%99string%e7%b1%bb%ef%bc%9a%e5%90%8c%e6%97%b6%e5%ae%9e%e7%8e%b0%e6%8b%b7%e8%b4%9d%e6%9e%84%e9%80%a0%e4%b8%8e%e7%a7%bb%e5%8a%a8%e6%9e%84%e9%80%a0","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/113902.html","title":{"rendered":"\u3010C++\u9762\u8bd5\u3011\u624b\u5199String\u7c7b\uff1a\u540c\u65f6\u5b9e\u73b0\u62f7\u8d1d\u6784\u9020\u4e0e\u79fb\u52a8\u6784\u9020"},"content":{"rendered":"

<\/h2>\n

\u4e00\u3001String\u7c7b\u9700\u8981\u89e3\u51b3\u4ec0\u4e48\u95ee\u9898<\/h3>\n

\u5047\u8bbe\u81ea\u5df1\u8bbe\u8ba1\u4e00\u4e2a\u5b57\u7b26\u4e32\u7c7b：<\/p>\n

class String {
\nprivate:
\n char *data_;
\n}; <\/p>\n

\u5982\u679c\u521b\u5efa：<\/p>\n

String str("hello"); <\/p>\n

\u5e0c\u671b\u5185\u90e8\u7ed3\u6784\u7c7b\u4f3c：<\/p>\n

String\u5bf9\u8c61<\/p>\n

\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510
\n\u2502 data_ \u2502\u2500\u2500\u2500\u2500\u2500\u2500\u2510
\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518 \u2502
\n \u2193
\n \u5806\u5185\u5b58<\/p>\n

\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510
\n \u2502 h e l l o \\\\0\u2502
\n \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518 <\/p>\n

\u56e0\u4e3a\u5b57\u7b26\u4e32\u957f\u5ea6\u8fd0\u884c\u65f6\u624d\u80fd\u786e\u5b9a，\u6240\u4ee5\u53ef\u4ee5：<\/p>\n

new char[len + 1]; <\/p>\n

\u52a8\u6001\u7533\u8bf7\u7a7a\u95f4\u3002<\/p>\n

\u4f46\u662f\u53ea\u5199\u6784\u9020\u548c\u6790\u6784\u8fd8\u4e0d\u591f\u3002<\/p>\n

\u4f8b\u5982：<\/p>\n

String s1("hello");<\/p>\n

String s2 = s1; <\/p>\n

\u8fd9\u91cc\u4f1a\u53d1\u751f：<\/p>\n

\u62f7\u8d1d\u6784\u9020 <\/p>\n

\u5982\u679c\u76f4\u63a5\u8fdb\u884c\u9ed8\u8ba4\u6d45\u62f7\u8d1d：<\/p>\n

s1.data_ \u2500\u2500\u2500\u2500\u2500\u2510
\n \u2193
\n "hello"
\n \u2191
\ns2.data_ \u2500\u2500\u2500\u2500\u2500\u2518 <\/p>\n

\u4e24\u4e2a\u5bf9\u8c61\u6307\u5411\u540c\u4e00\u5757\u5185\u5b58\u3002<\/p>\n

\u5f53\u4e24\u4e2a\u5bf9\u8c61\u6790\u6784：<\/p>\n

delete[] s1.data_;
\ndelete[] s2.data_; <\/p>\n

\u540c\u4e00\u5757\u5185\u5b58\u5c31\u53ef\u80fd\u88ab\u91ca\u653e\u4e24\u6b21\u3002<\/p>\n

\u56e0\u6b64\u5fc5\u987b：<\/p>\n

\u6df1\u62f7\u8d1d <\/p>\n

\u8ba9\u4e24\u4e2a\u5bf9\u8c61\u62e5\u6709\u72ec\u7acb\u8d44\u6e90\u3002<\/p>\n

\u800c\u5982\u679c\u6e90\u5bf9\u8c61\u9a6c\u4e0a\u5c31\u4e0d\u7528\u4e86：<\/p>\n

String s2 = std::move(s1); <\/p>\n

\u5c31\u6ca1\u5fc5\u8981\u518d\u590d\u5236\u6574\u4e2a\u5b57\u7b26\u4e32，\u53ef\u4ee5\u76f4\u63a5：<\/p>\n

\u628as1\u7684\u8d44\u6e90\u4ea4\u7ed9s2 <\/p>\n

\u8fd9\u5c31\u662f\u79fb\u52a8\u6784\u9020\u3002<\/p>\n

\u6240\u4ee5\u8fd9\u9053\u9898\u5b9e\u9645\u4e0a\u662f\u5728\u8003：<\/p>\n

\u52a8\u6001\u8d44\u6e90\u7ba1\u7406
\n \u2193
\n\u62f7\u8d1d\u6784\u9020
\n \u2193
\n\u6df1\u62f7\u8d1d
\n \u2193
\n\u79fb\u52a8\u6784\u9020
\n \u2193
\n\u8d44\u6e90\u6240\u6709\u6743\u8f6c\u79fb <\/p>\n

\u4e8c\u3001\u5148\u5b9e\u73b0\u666e\u901a\u6784\u9020\u548c\u6790\u6784<\/h3>\n

\u5148\u5199\u6700\u57fa\u7840\u7248\u672c：<\/p>\n

#include <cstring>
\n#include <iostream><\/p>\n

class String {
\nprivate:
\n char *data_;
\n size_t size_;<\/p>\n

public:
\n \/\/ \u666e\u901a\u6784\u9020
\n String(const char *str = "")
\n : data_(nullptr), size_(0) {<\/p>\n

if (str == nullptr) {
\n str = "";
\n }<\/p>\n

size_ = std::strlen(str);<\/p>\n

data_ = new char[size_ + 1];<\/p>\n

std::memcpy(data_, str, size_ + 1);<\/p>\n

std::cout << "\u666e\u901a\u6784\u9020" << std::endl;
\n }<\/p>\n

\/\/ \u6790\u6784\u51fd\u6570
\n ~String() {
\n delete[] data_;<\/p>\n

std::cout << "\u6790\u6784\u51fd\u6570" << std::endl;
\n }
\n}; <\/p>\n

\u4f8b\u5982：<\/p>\n

String s("hello"); <\/p>\n

\u6267\u884c：<\/p>\n

strlen("hello")
\n \u2193
\nsize_ = 5
\n \u2193
\nnew char[6]
\n \u2193
\n\u590d\u5236 hello\\\\0 <\/p>\n

\u5185\u5b58：<\/p>\n

\u6808：<\/p>\n

s
\n\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510
\n\u2502 data_ \u2502\u2500\u2500\u2500\u2500\u2500\u2510
\n\u2502 size_ = 5 \u2502 \u2502
\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518 \u2502
\n \u2193
\n \u5806：<\/p>\n

\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510
\n \u2502 h e l l o \\\\0\u2502
\n \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518 <\/p>\n

\u5f53：<\/p>\n

s <\/p>\n

\u79bb\u5f00\u4f5c\u7528\u57df：<\/p>\n

~String()
\n \u2193
\ndelete[] data_ <\/p>\n

\u81ea\u52a8\u91ca\u653e\u8d44\u6e90\u3002<\/p>\n

\u8fd9\u5176\u5b9e\u4e5f\u662f：<\/p>\n

RAII <\/p>\n

\u7684\u5178\u578b\u5e94\u7528\u3002<\/p>\n

\u4e09\u3001\u5b9e\u73b0\u62f7\u8d1d\u6784\u9020：\u5fc5\u987b\u8fdb\u884c\u6df1\u62f7\u8d1d<\/h3>\n

\u73b0\u5728：<\/p>\n

String s1("hello");<\/p>\n

String s2 = s1; <\/p>\n

\u8c03\u7528\u7684\u662f：<\/p>\n

String(const String &other); <\/p>\n

\u5b9e\u73b0：<\/p>\n

String(const String &other)
\n : data_(nullptr), size_(other.size_) {<\/p>\n

data_ = new char[size_ + 1];<\/p>\n

std::memcpy(data_,
\n other.data_,
\n size_ + 1);<\/p>\n

std::cout << "\u62f7\u8d1d\u6784\u9020" << std::endl;
\n} <\/p>\n

\u6ce8\u610f\u8fd9\u91cc\u4e0d\u80fd：<\/p>\n

data_ = other.data_; <\/p>\n

\u56e0\u4e3a\u8fd9\u6837\u53ea\u662f：<\/p>\n

\u590d\u5236\u6307\u9488\u5730\u5740 <\/p>\n

\u800c\u4e0d\u662f\u590d\u5236\u5b57\u7b26\u4e32\u3002<\/p>\n

\u9519\u8bef\u7684\u6d45\u62f7\u8d1d：<\/p>\n

s1
\n\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510
\n\u2502 data_ \u2502\u2500\u2500\u2500\u2500\u2500\u2510
\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518 \u2502
\n \u2193
\n "hello"
\n \u2191
\n\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510 \u2502
\n\u2502 data_ \u2502\u2500\u2500\u2500\u2500\u2500\u2518
\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518
\ns2 <\/p>\n

\u6b63\u786e\u7684\u6df1\u62f7\u8d1d：<\/p>\n

s1
\n\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510
\n\u2502 data_ \u2502\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2192 "hello"
\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518<\/p>\n

s2
\n\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510
\n\u2502 data_ \u2502\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2192 "hello"
\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518 <\/p>\n

\u867d\u7136：<\/p>\n

\u5b57\u7b26\u4e32\u5185\u5bb9\u76f8\u540c <\/p>\n

\u4f46\u662f：<\/p>\n

\u5185\u5b58\u5730\u5740\u4e0d\u540c <\/p>\n

\u56e0\u6b64：<\/p>\n

s2[0] = 'H'; <\/p>\n

\u4e0d\u4f1a\u5f71\u54cd：<\/p>\n

s1 <\/p>\n

\u8fd9\u5c31\u662f：<\/p>\n

\u6df1\u62f7\u8d1d
\nDeep Copy <\/p>\n

\u6240\u4ee5\u9762\u8bd5\u95ee：<\/p>\n

\u4e3a\u4ec0\u4e48 String \u7c7b\u5fc5\u987b\u81ea\u5df1\u5b9e\u73b0\u62f7\u8d1d\u6784\u9020？<\/p>\n

\u53ef\u4ee5\u56de\u7b54：<\/p>\n

\u56e0\u4e3a String \u5185\u90e8\u7ba1\u7406\u52a8\u6001\u5185\u5b58，\u5982\u679c\u4f7f\u7528\u7f16\u8bd1\u5668\u9ed8\u8ba4\u62f7\u8d1d\u6784\u9020，\u53ea\u4f1a\u590d\u5236\u6307\u9488\u5730\u5740，\u4e24\u4e2a\u5bf9\u8c61\u4f1a\u5171\u4eab\u540c\u4e00\u5757\u5185\u5b58，\u6790\u6784\u65f6\u53ef\u80fd\u4ea7\u751f\u91cd\u590d\u91ca\u653e\u3002\u56e0\u6b64\u9700\u8981\u5b9e\u73b0\u6df1\u62f7\u8d1d，\u4e3a\u65b0\u5bf9\u8c61\u91cd\u65b0\u7533\u8bf7\u5185\u5b58\u5e76\u590d\u5236\u5b57\u7b26\u4e32\u5185\u5bb9\u3002<\/p>\n

\u56db\u3001\u5b9e\u73b0\u79fb\u52a8\u6784\u9020：\u76f4\u63a5\u63a5\u7ba1\u8d44\u6e90<\/h3>\n

\u73b0\u5728：<\/p>\n

String s1("hello");<\/p>\n

String s2 = std::move(s1); <\/p>\n

\u8fd9\u91cc\u5e0c\u671b\u8c03\u7528：<\/p>\n

String(String &&other); <\/p>\n

\u79fb\u52a8\u6784\u9020\u53ef\u4ee5\u5199\u6210：<\/p>\n

String(String &&other) noexcept
\n : data_(other.data_),
\n size_(other.size_) {<\/p>\n

other.data_ = nullptr;
\n other.size_ = 0;<\/p>\n

std::cout << "\u79fb\u52a8\u6784\u9020" << std::endl;
\n} <\/p>\n

\u79fb\u52a8\u4e4b\u524d：<\/p>\n

s1
\n\u2502
\n\u2514\u2500\u2500\u2500\u2500\u2192 "hello" <\/p>\n

\u6267\u884c：<\/p>\n

data_ = other.data_; <\/p>\n

\u4ee5\u540e：<\/p>\n

s1 \u2500\u2500\u2500\u2500\u2500\u2510
\n \u2193
\n "hello"
\n \u2191
\ns2 \u2500\u2500\u2500\u2500\u2500\u2518 <\/p>\n

\u5982\u679c\u505c\u5728\u8fd9\u91cc：<\/p>\n

\u4e24\u4e2a\u5bf9\u8c61\u8fd8\u662f\u6307\u5411\u540c\u4e00\u8d44\u6e90 <\/p>\n

\u6240\u4ee5\u5fc5\u987b：<\/p>\n

other.data_ = nullptr;
\nother.size_ = 0; <\/p>\n

\u6700\u7ec8：<\/p>\n

s1
\n\u2193
\nnullptr<\/p>\n

s2
\n\u2193
\n"hello" <\/p>\n

\u8fd9\u6837 s1 \u6790\u6784\u65f6：<\/p>\n

delete[] nullptr; <\/p>\n

\u662f\u5b89\u5168\u7684\u3002<\/p>\n

\u771f\u6b63\u7684 "hello"：<\/p>\n

\u5df2\u7ecf\u4ea4\u7ed9s2\u7ba1\u7406 <\/p>\n

\u6240\u4ee5：<\/p>\n

\u62f7\u8d1d\u6784\u9020
\n\u2193
\n\u91cd\u65b0\u7533\u8bf7\u5185\u5b58
\n\u2193
\n\u590d\u5236\u6570\u636e <\/p>\n

\u800c：<\/p>\n

\u79fb\u52a8\u6784\u9020
\n\u2193
\n\u4e0d\u590d\u5236\u5b57\u7b26\u4e32
\n\u2193
\n\u76f4\u63a5\u63a5\u7ba1\u6307\u9488 <\/p>\n

\u8fd9\u5c31\u662f\u79fb\u52a8\u8bed\u4e49\u6027\u80fd\u66f4\u9ad8\u7684\u539f\u56e0\u3002<\/p>\n

\u79fb\u52a8\u6784\u9020\u5efa\u8bae\u5199：<\/p>\n

noexcept <\/p>\n

\u5373：<\/p>\n

String(String &&other) noexcept; <\/p>\n

\u56e0\u4e3a\u50cf：<\/p>\n

std::vector<String> <\/p>\n

\u6269\u5bb9\u65f6\u9700\u8981\u628a\u65e7\u5143\u7d20\u642c\u5230\u65b0\u7684\u5185\u5b58\u3002<\/p>\n

\u5982\u679c\u79fb\u52a8\u6784\u9020\u660e\u786e：<\/p>\n

\u4e0d\u4f1a\u629b\u5f02\u5e38 <\/p>\n

\u6807\u51c6\u5bb9\u5668\u5c31\u66f4\u5bb9\u6613\u5b89\u5168\u5730\u4f18\u5148\u4f7f\u7528\u79fb\u52a8\u6784\u9020，\u800c\u4e0d\u662f\u62f7\u8d1d\u6784\u9020\u3002<\/p>\n

\u4e94\u3001\u5b8c\u6574\u5b9e\u73b0：Rule of Five<\/h3>\n

\u65e2\u7136 String \u81ea\u5df1\u7ba1\u7406：<\/p>\n

\u52a8\u6001\u5185\u5b58 <\/p>\n

\u90a3\u4e48\u9664\u4e86：<\/p>\n

\u6790\u6784\u51fd\u6570
\n\u62f7\u8d1d\u6784\u9020
\n\u79fb\u52a8\u6784\u9020 <\/p>\n

\u8fd8\u5e94\u8be5\u8003\u8651：<\/p>\n

\u62f7\u8d1d\u8d4b\u503c
\n\u79fb\u52a8\u8d4b\u503c <\/p>\n

\u8fd9\u5c31\u662f：<\/p>\n

Rule of Five
\n\u4e94\u6cd5\u5219 <\/p>\n

\u4e00\u4e2a\u9002\u5408\u9762\u8bd5\u624b\u5199\u7684\u5b8c\u6574\u7248\u672c：<\/p>\n

#include <cstring>
\n#include <iostream>
\n#include <utility><\/p>\n

class String {
\nprivate:
\n char *data_;
\n size_t size_;<\/p>\n

public:
\n \/\/ 1. \u666e\u901a\u6784\u9020
\n String(const char *str = "")
\n : data_(nullptr), size_(0) {<\/p>\n

if (str == nullptr) {
\n str = "";
\n }<\/p>\n

size_ = std::strlen(str);<\/p>\n

data_ = new char[size_ + 1];<\/p>\n

std::memcpy(data_,
\n str,
\n size_ + 1);<\/p>\n

std::cout << "\u666e\u901a\u6784\u9020" << std::endl;
\n }<\/p>\n

\/\/ 2. \u6790\u6784\u51fd\u6570
\n ~String() {
\n delete[] data_;<\/p>\n

std::cout << "\u6790\u6784\u51fd\u6570" << std::endl;
\n }<\/p>\n

\/\/ 3. \u62f7\u8d1d\u6784\u9020
\n String(const String &other)
\n : data_(nullptr),
\n size_(other.size_) {<\/p>\n

data_ = new char[size_ + 1];<\/p>\n

std::memcpy(data_,
\n other.data_,
\n size_ + 1);<\/p>\n

std::cout << "\u62f7\u8d1d\u6784\u9020" << std::endl;
\n }<\/p>\n

\/\/ 4. \u79fb\u52a8\u6784\u9020
\n String(String &&other) noexcept
\n : data_(other.data_),
\n size_(other.size_) {<\/p>\n

other.data_ = nullptr;
\n other.size_ = 0;<\/p>\n

std::cout << "\u79fb\u52a8\u6784\u9020" << std::endl;
\n }<\/p>\n

\/\/ 5. \u62f7\u8d1d\u8d4b\u503c
\n String &operator=(const String &other) {
\n if (this != &other) {<\/p>\n

\/\/ \u5148\u7533\u8bf7\u65b0\u7a7a\u95f4
\n char *newData =
\n new char[other.size_ + 1];<\/p>\n

std::memcpy(newData,
\n other.data_,
\n other.size_ + 1);<\/p>\n

\/\/ \u518d\u91ca\u653e\u81ea\u5df1\u539f\u6765\u7684\u8d44\u6e90
\n delete[] data_;<\/p>\n

data_ = newData;
\n size_ = other.size_;
\n }<\/p>\n

std::cout << "\u62f7\u8d1d\u8d4b\u503c" << std::endl;<\/p>\n

return *this;
\n }<\/p>\n

\/\/ 6. \u79fb\u52a8\u8d4b\u503c
\n String &operator=(String &&other) noexcept {
\n if (this != &other) {<\/p>\n

\/\/ \u5148\u91ca\u653e\u81ea\u5df1\u539f\u6765\u7684\u8d44\u6e90
\n delete[] data_;<\/p>\n

\/\/ \u63a5\u7ba1other\u7684\u8d44\u6e90
\n data_ = other.data_;
\n size_ = other.size_;<\/p>\n

\/\/ other\u4e0d\u518d\u62e5\u6709\u8d44\u6e90
\n other.data_ = nullptr;
\n other.size_ = 0;
\n }<\/p>\n

std::cout << "\u79fb\u52a8\u8d4b\u503c" << std::endl;<\/p>\n

return *this;
\n }<\/p>\n

\/\/ \u83b7\u53d6\u5b57\u7b26\u4e32
\n const char *c_str() const {
\n return data_ ? data_ : "";
\n }<\/p>\n

\/\/ \u83b7\u53d6\u957f\u5ea6
\n size_t size() const {
\n return size_;
\n }<\/p>\n

\/\/ \u4e0b\u6807\u8bbf\u95ee
\n char &operator[](size_t index) {
\n return data_[index];
\n }<\/p>\n

const char &operator[](size_t index) const {
\n return data_[index];
\n }
\n}; <\/p>\n

\u6d4b\u8bd5：<\/p>\n

int main() {
\n String s1("hello");<\/p>\n

\/\/ \u62f7\u8d1d\u6784\u9020
\n String s2 = s1;<\/p>\n

\/\/ \u79fb\u52a8\u6784\u9020
\n String s3 = std::move(s1);<\/p>\n

String s4("world");<\/p>\n

\/\/ \u62f7\u8d1d\u8d4b\u503c
\n s4 = s2;<\/p>\n

String s5("C++");<\/p>\n

\/\/ \u79fb\u52a8\u8d4b\u503c
\n s5 = std::move(s3);<\/p>\n

std::cout << "s2 = "
\n << s2.c_str()
\n << std::endl;<\/p>\n

std::cout << "s5 = "
\n << s5.c_str()
\n << std::endl;<\/p>\n

return 0;
\n} <\/p>\n

\u6574\u4e2a\u533a\u522b\u53ef\u4ee5\u76f4\u63a5\u8bb0\u6210：<\/p>\n

String s2 = s1; <\/p>\n

\u8c03\u7528：<\/p>\n

\u62f7\u8d1d\u6784\u9020 <\/p>\n

\u8fc7\u7a0b：<\/p>\n

s1 \u2192 "hello"<\/p>\n

\u91cd\u65b0\u7533\u8bf7\u5185\u5b58
\n \u2193
\n\u590d\u5236hello
\n \u2193<\/p>\n

s2 \u2192 "hello" <\/p>\n

\u800c：<\/p>\n

String s3 = std::move(s1); <\/p>\n

\u8c03\u7528：<\/p>\n

\u79fb\u52a8\u6784\u9020 <\/p>\n

\u8fc7\u7a0b：<\/p>\n

s1 \u2192 "hello"
\n \u2193
\n\u628a\u6307\u9488\u4ea4\u51fa\u53bb
\n \u2193
\ns1 \u2192 nullptr<\/p>\n

s3 \u2192 "hello" <\/p>\n

\u9700\u8981\u7279\u522b\u533a\u5206：<\/p>\n

String s2 = s1; <\/p>\n

\u8fd9\u662f：<\/p>\n

\u62f7\u8d1d\u6784\u9020 <\/p>\n

\u56e0\u4e3a：<\/p>\n

s2\u539f\u6765\u4e0d\u5b58\u5728
\n\u73b0\u5728\u6b63\u5728\u521b\u5efa <\/p>\n

\u800c：<\/p>\n

String s2("abc");
\ns2 = s1; <\/p>\n

\u8fd9\u662f：<\/p>\n

\u62f7\u8d1d\u8d4b\u503c <\/p>\n

\u56e0\u4e3a：<\/p>\n

s2\u5df2\u7ecf\u5b58\u5728 <\/p>\n

\u9700\u8981\u5148\u5904\u7406\u81ea\u5df1\u539f\u6765\u7684\u8d44\u6e90，\u518d\u590d\u5236 s1\u3002<\/p>\n

\u79fb\u52a8\u540c\u6837\u5982\u6b64：<\/p>\n

String s2 = std::move(s1); <\/p>\n

\u662f：<\/p>\n

\u79fb\u52a8\u6784\u9020 <\/p>\n

\u800c：<\/p>\n

String s2("abc");<\/p>\n

s2 = std::move(s1); <\/p>\n

\u662f：<\/p>\n

\u79fb\u52a8\u8d4b\u503c <\/p>\n

\u6240\u4ee5\u9762\u8bd5\u4e2d\u53ef\u4ee5\u8fd9\u6837\u603b\u7ed3：<\/p>\n

\u81ea\u5b9a\u4e49 String \u7c7b\u5185\u90e8\u901a\u8fc7 char* \u7ba1\u7406\u52a8\u6001\u5185\u5b58\u3002\u666e\u901a\u6784\u9020\u6839\u636e\u5b57\u7b26\u4e32\u957f\u5ea6\u7533\u8bf7\u5185\u5b58；\u6790\u6784\u51fd\u6570\u8d1f\u8d23\u91ca\u653e\u8d44\u6e90；\u62f7\u8d1d\u6784\u9020\u9700\u8981\u8fdb\u884c\u6df1\u62f7\u8d1d，\u91cd\u65b0\u7533\u8bf7\u4e00\u5757\u72ec\u7acb\u5185\u5b58\u5e76\u590d\u5236\u5b57\u7b26\u4e32；\u79fb\u52a8\u6784\u9020\u5219\u76f4\u63a5\u63a5\u7ba1\u6e90\u5bf9\u8c61\u7684\u6307\u9488，\u7136\u540e\u628a\u6e90\u5bf9\u8c61\u6307\u9488\u7f6e\u7a7a，\u4ece\u800c\u907f\u514d\u5927\u5b57\u7b26\u4e32\u590d\u5236\u3002\u56e0\u4e3a\u7c7b\u81ea\u5df1\u7ba1\u7406\u8d44\u6e90，\u8fd8\u9700\u8981\u540c\u65f6\u8003\u8651\u62f7\u8d1d\u8d4b\u503c\u548c\u79fb\u52a8\u8d4b\u503c，\u4e5f\u5c31\u662f Rule of Five\u3002<\/p>\n

\u5982\u679c\u9762\u8bd5\u5b98\u7ee7\u7eed\u95ee：<\/p>\n

\u62f7\u8d1d\u6784\u9020\u548c\u79fb\u52a8\u6784\u9020\u6700\u5927\u7684\u533a\u522b\u662f\u4ec0\u4e48？<\/p>\n

\u53ef\u4ee5\u56de\u7b54：<\/p>\n

\u62f7\u8d1d\u6784\u9020\u4e0d\u4f1a\u7834\u574f\u6e90\u5bf9\u8c61，\u5b83\u9700\u8981\u521b\u5efa\u4e00\u4efd\u72ec\u7acb\u8d44\u6e90；\u79fb\u52a8\u6784\u9020\u7528\u4e8e\u8d44\u6e90\u53ef\u4ee5\u88ab\u8f6c\u79fb\u7684\u5bf9\u8c61，\u76f4\u63a5\u63a5\u7ba1\u6e90\u5bf9\u8c61\u8d44\u6e90，\u5e76\u628a\u6e90\u5bf9\u8c61\u8c03\u6574\u4e3a\u5408\u6cd5\u4f46\u4e0d\u518d\u62e5\u6709\u539f\u8d44\u6e90\u7684\u72b6\u6001，\u56e0\u6b64\u5bf9\u4e8e\u52a8\u6001\u8d44\u6e90\u8f83\u5927\u7684\u5bf9\u8c61\u901a\u5e38\u6548\u7387\u66f4\u9ad8\u3002<\/p>\n

\u5982\u679c\u7ee7\u7eed\u95ee：<\/p>\n

\u4e3a\u4ec0\u4e48\u79fb\u52a8\u4ee5\u540e\u8981\u628a other.data_ \u7f6e\u7a7a？<\/p>\n

\u53ef\u4ee5\u56de\u7b54：<\/p>\n

\u56e0\u4e3a\u8d44\u6e90\u5df2\u7ecf\u8f6c\u79fb\u7ed9\u65b0\u5bf9\u8c61\u3002\u5982\u679c\u6e90\u5bf9\u8c61\u4ecd\u7136\u4fdd\u7559\u539f\u6307\u9488，\u90a3\u4e48\u4e24\u4e2a\u5bf9\u8c61\u6790\u6784\u65f6\u90fd\u4f1a delete[] \u540c\u4e00\u5757\u5185\u5b58，\u9020\u6210 Double Free，\u6240\u4ee5\u79fb\u52a8\u540e\u9700\u8981\u8ba9\u6e90\u5bf9\u8c61\u4e0d\u518d\u62e5\u6709\u8fd9\u5757\u8d44\u6e90\u3002<\/p>\n

\u5982\u679c\u7ee7\u7eed\u95ee：<\/p>\n

\u4e3a\u4ec0\u4e48\u79fb\u52a8\u6784\u9020\u5199 noexcept？<\/p>\n

\u53ef\u4ee5\u56de\u7b54：<\/p>\n

\u56e0\u4e3a STL \u5bb9\u5668\u5728\u6269\u5bb9\u642c\u8fc1\u5143\u7d20\u65f6\u9700\u8981\u8003\u8651\u5f02\u5e38\u5b89\u5168\u3002\u5982\u679c\u79fb\u52a8\u6784\u9020\u58f0\u660e\u4e3a noexcept，\u5bb9\u5668\u53ef\u4ee5\u66f4\u653e\u5fc3\u5730\u4f7f\u7528\u79fb\u52a8\u6784\u9020，\u4ece\u800c\u907f\u514d\u6210\u672c\u8f83\u9ad8\u7684\u6df1\u62f7\u8d1d\u3002<\/p>\n

\u6574\u4e2a String \u7c7b\u7684\u6838\u5fc3\u77e5\u8bc6\u94fe\u5c31\u662f：<\/p>\n

char*
\n \u2193
\n\u52a8\u6001\u5185\u5b58
\n \u2193
\n\u6790\u6784\u91ca\u653e
\n \u2193
\n\u9ed8\u8ba4\u6d45\u62f7\u8d1d\u6709\u95ee\u9898
\n \u2193
\n\u62f7\u8d1d\u6784\u9020\u5b9e\u73b0\u6df1\u62f7\u8d1d
\n \u2193
\n\u79fb\u52a8\u6784\u9020\u8f6c\u79fb\u8d44\u6e90
\n \u2193
\n\u62f7\u8d1d\u8d4b\u503c
\n \u2193
\n\u79fb\u52a8\u8d4b\u503c
\n \u2193
\nRule of Five <\/p>\n

\u5982\u679c\u8fd9\u662f\u73b0\u573a\u7b14\u8bd5，\u65f6\u95f4\u6bd4\u8f83\u7d27，\u81f3\u5c11\u8981\u628a\u4e0b\u9762\u4e09\u4e2a\u51fd\u6570\u5199\u6b63\u786e：<\/p>\n

~String();<\/p>\n

String(const String &other);<\/p>\n

String(String &&other) noexcept; <\/p>\n

\u4e5f\u5c31\u662f：<\/p>\n

\u6790\u6784
\n+
\n\u6df1\u62f7\u8d1d
\n+
\n\u79fb\u52a8\u8d44\u6e90 <\/p>\n

\u8fd9\u4e09\u4e2a\u57fa\u672c\u5c31\u662f\u8fd9\u9053\u9898\u6700\u6838\u5fc3\u7684\u8003\u70b9\u3002<\/p>\n

0voice \u00b7 GitHub<\/p>\n","protected":false},"excerpt":{"rendered":"

\u4e00\u3001String\u7c7b\u9700\u8981\u89e3\u51b3\u4ec0\u4e48\u95ee\u9898
\n\u5047\u8bbe\u81ea\u5df1\u8bbe\u8ba1\u4e00\u4e2a\u5b57\u7b26\u4e32\u7c7b：
\nclass String {
\nprivate:char *data_;
\n};
\n\u5982\u679c\u521b\u5efa：
\nString str(\\”hello\\”);
\n\u5e0c\u671b\u5185\u90e8\u7ed3\u6784\u7c7b\u4f3c：
\nString\u5bf9\u8c61\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510
\n\u2502 data_ \u2502\u2500\u2500\u2500\u2500\u2500\u2500\u2510
\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518 \u2502\u2193\u5806\u5185\u5b58\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510\u2502 h e l l o \\\\0<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[55,427],"topic":[],"class_list":["post-113902","post","type-post","status-publish","format-standard","hentry","category-server","tag-c","tag-427"],"yoast_head":"\n\u3010C++\u9762\u8bd5\u3011\u624b\u5199String\u7c7b\uff1a\u540c\u65f6\u5b9e\u73b0\u62f7\u8d1d\u6784\u9020\u4e0e\u79fb\u52a8\u6784\u9020 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/113902.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u3010C++\u9762\u8bd5\u3011\u624b\u5199String\u7c7b\uff1a\u540c\u65f6\u5b9e\u73b0\u62f7\u8d1d\u6784\u9020\u4e0e\u79fb\u52a8\u6784\u9020 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"og:description\" content=\"\u4e00\u3001String\u7c7b\u9700\u8981\u89e3\u51b3\u4ec0\u4e48\u95ee\u9898 \u5047\u8bbe\u81ea\u5df1\u8bbe\u8ba1\u4e00\u4e2a\u5b57\u7b26\u4e32\u7c7b： class String { private:char *data_; 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