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",[939,2498,1044],{"class":949},[939,2500,1733],{"class":1199},[939,2502,1244],{"class":949},[939,2504,1337],{"class":1199},[939,2506,1005],{"class":949},[939,2508,2510,2512,2514],{"class":941,"line":2509},94,[939,2511,2437],{"class":945},[939,2513,2476],{"class":1199},[939,2515,1005],{"class":949},[939,2517,2519],{"class":941,"line":2518},95,[939,2520,2448],{"class":949},[918,2522,2523,2524,2527,2528,2530,2531,2534,2535,2538],{},"其中我略微更改了 ",[922,2525,2526],{},"operator+"," 的重载方式，使得其更合理。你也可以根据此代码增加更多功能或者重载其它运算符（比如根据字典序比较 ",[922,2529,2019],{}," ",[922,2532,2533],{},">","）。但由于我们的内存分配方式很低效：每次赋值都需要释放空间重新分配；所以这个并不适合用在一般的场合。幸运的是，标准库提供了字符串类 ",[922,2536,2537],{},"std::string"," 供我们使用。",[918,2540,2541,2543,2544,2547,2548,2551],{},[922,2542,2537],{}," 定义在头文件 ",[922,2545,2546],{},"\u003Cstring>"," 中（注意不是 ",[922,2549,2550],{},"\u003Ccstring>","！）。这个类定义了和我们类似的成员和运算符重载：",[2553,2554,2555,2562,2577,2594],"ul",{},[2556,2557,2558,2559,2561],"li",{},"默认\u002F复制构造函数；基于个数和某个 ",[922,2560,2187],{}," 的构造；从 C 风格字符串构造；",[2556,2563,2564,2565,2568,2569,2568,2571,2568,2574,2568],{},"复制赋值重载；",[922,2566,2567],{},"operator[]","；",[922,2570,2526],{},[922,2572,2573],{},"operator+=",[922,2575,2576],{},"operator==",[2556,2578,2579,2580,2583,2584,2587,2588,2530,2591,2568],{},"对 ",[922,2581,2582],{},"std::cin"," 和 ",[922,2585,2586],{},"std::cout"," 的支持：",[922,2589,2590],{},"operator\u003C\u003C",[922,2592,2593],{},"opreator>>",[2556,2595,2596,2597,2600,2601,2568],{},"求长度 ",[922,2598,2599],{},"length()","；寻找字符出现位置 ",[922,2602,2603],{},"find()",[918,2605,2606],{},"比如：",[930,2608,2610],{"className":932,"code":2609,"language":934,"meta":935,"style":935},"#include \u003Cstring>\n#include \u003Ciostream>\nint main() {\n    std::string a(\"Hello\"), b;   \u002F\u002F 构造函数们\n    std::cin >> b;               \u002F\u002F 输入支持\n    a += (\" \" + b);              \u002F\u002F 各种运算符重载\n    a[5] = ',';\n    std::cout \u003C\u003C b \u003C\u003C std::endl; \u002F\u002F 输出支持\n}\n",[922,2611,2612,2623,2633,2645,2677,2696,2720,2742,2770],{"__ignoreMap":935},[939,2613,2614,2616,2618,2621],{"class":941,"line":942},[939,2615,946],{"class":945},[939,2617,950],{"class":949},[939,2619,2620],{"class":953},"string",[939,2622,957],{"class":949},[939,2624,2625,2627,2629,2631],{"class":941,"line":960},[939,2626,946],{"class":945},[939,2628,950],{"class":949},[939,2630,967],{"class":953},[939,2632,957],{"class":949},[939,2634,2635,2638,2641,2643],{"class":941,"line":972},[939,2636,2637],{"class":975},"int",[939,2639,2640],{"class":1150}," main",[939,2642,1154],{"class":949},[939,2644,983],{"class":949},[939,2646,2647,2649,2651,2654,2656,2658,2661,2664,2666,2669,2671,2673],{"class":941,"line":986},[939,2648,2354],{"class":979},[939,2650,1031],{"class":949},[939,2652,2653],{"class":1199},"string ",[939,2655,2329],{"class":1150},[939,2657,1047],{"class":949},[939,2659,2660],{"class":949},"\"",[939,2662,2663],{"class":953},"Hello",[939,2665,2660],{"class":949},[939,2667,2668],{"class":949},"),",[939,2670,1733],{"class":1199},[939,2672,1297],{"class":949},[939,2674,2676],{"class":2675},"sHwdD","   \u002F\u002F 构造函数们\n",[939,2678,2679,2681,2683,2686,2689,2691,2693],{"class":941,"line":995},[939,2680,2354],{"class":979},[939,2682,1031],{"class":949},[939,2684,2685],{"class":1199},"cin ",[939,2687,2688],{"class":949},">>",[939,2690,1733],{"class":1199},[939,2692,1297],{"class":949},[939,2694,2695],{"class":2675},"               \u002F\u002F 输入支持\n",[939,2697,2698,2701,2703,2705,2707,2710,2712,2714,2717],{"class":941,"line":1008},[939,2699,2700],{"class":1199},"    a ",[939,2702,1722],{"class":949},[939,2704,1282],{"class":949},[939,2706,2660],{"class":949},[939,2708,2709],{"class":949}," \"",[939,2711,1751],{"class":949},[939,2713,1733],{"class":1199},[939,2715,2716],{"class":949},");",[939,2718,2719],{"class":2675},"              \u002F\u002F 各种运算符重载\n",[939,2721,2722,2725,2727,2730,2732,2734,2736,2738,2740],{"class":941,"line":1022},[939,2723,2724],{"class":1199},"    a",[939,2726,1187],{"class":949},[939,2728,2729],{"class":1040},"5",[939,2731,1327],{"class":949},[939,2733,1330],{"class":949},[939,2735,1583],{"class":949},[939,2737,1059],{"class":953},[939,2739,1196],{"class":949},[939,2741,1005],{"class":949},[939,2743,2744,2746,2748,2751,2753,2756,2758,2760,2762,2765,2767],{"class":941,"line":1072},[939,2745,2354],{"class":979},[939,2747,1031],{"class":949},[939,2749,2750],{"class":1199},"cout ",[939,2752,1044],{"class":949},[939,2754,2755],{"class":1199}," b ",[939,2757,1044],{"class":949},[939,2759,1028],{"class":979},[939,2761,1031],{"class":949},[939,2763,2764],{"class":1199},"endl",[939,2766,1297],{"class":949},[939,2768,2769],{"class":2675}," \u002F\u002F 输出支持\n",[939,2771,2772],{"class":941,"line":1103},[939,2773,2448],{"class":949},[918,2775,2776],{},"它还定义了这些：",[2553,2778,2779,2782,2788],{},[2556,2780,2781],{},"各种比较运算符重载（通过字典序比字符串大小）；",[2556,2783,2784,2785,2568],{},"得到只读版本的 C 风格字符串 ",[922,2786,2787],{},"c_str()",[2556,2789,2790,2791,2794,2795,2798,2799,2802],{},"删除字符 ",[922,2792,2793],{},"erase()","、替换字符 ",[922,2796,2797],{},"replace()","、求子串 ",[922,2800,2801],{},"substr()"," 等等；",[918,2804,2805,2806,2812],{},"如果你感兴趣的话，可以参考",[2329,2807,2811],{"href":2808,"rel":2809},"https:\u002F\u002Fzh.cppreference.com\u002Fw\u002Fcpp\u002Fstring\u002Fbasic_string",[2810],"nofollow","这些文档","了解其定义的全部操作；本书不会在标准库内容上做过多停留。你只需知道，作为标准库的字符串类，它在算法上做了一定程度的优化，使得我们能够比较高效地利用它处理字符串问题。",[2814,2815,2816],"style",{},"html pre.shiki code .s7zQu, html code.shiki .s7zQu{--shiki-light:#39ADB5;--shiki-light-font-style:italic;--shiki-default:#89DDFF;--shiki-default-font-style:italic;--shiki-dark:#89DDFF;--shiki-dark-font-style:italic}html pre.shiki code .sMK4o, html 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