Question

所以我有这个：

class myString : public std::string{

public:

    void translate(){
        std::string phrase = blarg;

        ... Code ...

        blarg = phrase;
    }

现在，我知道它不是blarg，但是我需要在这里访问与myString字符串继承关联的字符串？

除此之外，我可以这样做：

myString phrase;
phrase = "Roar";

那么如何访问＆＃34; Roar＆＃34;在我的功能？

一切都包括在内。

Answer 1

只需使用this指针访问该对象。

class myString : public std::string
{
    public:

    void translate()
    {
        std::string phrase = *this;
        /*
        ... Code ...
        */
        *static_cast<string*> (this) = phrase;
    }
}

Answer 2

你不应该这样做。

但这是代码

#include <iostream>
#include <string>
#include <vector>

class myString : public std::string{
public:
    using std::string::string; // inheriting the constructors from std::string
    void translate(){
        // `std::string phrase = *this` won't work because no such constructor takes `myString` exist
        std::string phrase(this->c_str(), this->length()); 

        phrase += "2";

        // operator= won't work because type doesn't match
        // it is expecting `myString` type but not `std::string`
        this->assign(phrase); // use assign instead of operator=
    }    
};

int main()
{
    myString m = "test";
    std::cout << m << '\n'; // test
    m.translate();
    std::cout << m << '\n'; // test2
}

online demo

继承自std :: string

2 个答案: