仿照标准字符串类string,设置一个自己的字符串类

好的，我可以为您提供一个简单的自定义字符串类的示例代码：

#include <iostream>
#include <cstring>

class MyString {
private:
    char* str;
    int length;
public:
    MyString() {
        length = 0;
        str = new char[1];
        str[0] = '\0';
    }

    MyString(const char* s) {
        length = std::strlen(s);
        str = new char[length + 1];
        std::strcpy(str, s);
    }

    MyString(const MyString& other) {
        length = other.length;
        str = new char[length + 1];
        std::strcpy(str, other.str);
    }

    ~MyString() {
        delete[] str;
    }

    MyString& operator=(const MyString& other) {
        if (this != &other) {
            delete[] str;
            length = other.length;
            str = new char[length + 1];
            std::strcpy(str, other.str);
        }
        return *this;
    }

    MyString operator+(const MyString& other) const {
        MyString result;
        result.length = length + other.length;
        delete[] result.str;
        result.str = new char[result.length + 1];
        std::strcpy(result.str, str);
        std::strcat(result.str, other.str);
        return result;
    }

    bool operator==(const MyString& other) const {
        return std::strcmp(str, other.str) == 0;
    }

    bool operator!=(const MyString& other) const {
        return !(*this == other);
    }

    char& operator[](int index) {
        return str[index];
    }

    const char& operator[](int index) const {
        return str[index];
    }

    int size() const {
        return length;
    }

    const char* c_str() const {
        return str;
    }

    friend std::ostream& operator<<(std::ostream& os, const MyString& s) {
        os << s.str;
        return os;
    }
};

int main() {
    MyString s1("Hello");
    MyString s2("World");
    MyString s3 = s1 + s2;
    std::cout << s3 << std::endl;
    std::cout << s3.size() << std::endl;
    std::cout << s3.c_str() << std::endl;
    return 0;
}

这个自定义字符串类包含了一些常见的操作符重载和成员函数，例如构造函数、析构函数、复制构造函数、赋值运算符、加法运算符、比较运算符、下标运算符、size函数和c_str函数等。