如何用C ++初始化一个const char数组数据成员？ [英] How to initialize a const char array data member with C++?

问题描述

我有一个与C ++类成员初始化相关的问题。以下代码说明了我的问题：

I have a question related to C++ class member initialization. The following code illustrates my question:

class ABCD
{
public:
    ABCD():ObjNum(3){};
    ~ABCD() {};
     static const  unsigned char getByte[8];
     const int ObjNum;


};

const unsigned char ABCD::getByte[8] = {
    'a','b','c','d','e','f','g','h'
};

int main() 
{
     ABCD test;
     cout<<test.getByte[3]<<endl;


     return 0;
}

上面的代码工作得很好，但现在如果我没有设置getByte [ 8] as static，我如何初始化类？我以这种方式尝试，但失败：

The above codes work very well, but now if I do not set getByte[8] as static, how could I initialize the class? I have tried in this way, but failed:

class ABCD
{
public:
    ABCD():ObjNum(3),getByte('a','b','c','d','e','f','g','h')
    {

    };
    ~ABCD() {};
    const  unsigned char getByte[8];
     const int ObjNum;


};



int main() 
{
     ABCD test;
     cout<<test.getByte[3]<<endl;


     return 0;
}

我获得的错误如下：

 error C2536: 'ABCD::ABCD::getByte' : cannot specify explicit initializer for arrays

我理解我得到错误的原因，但我不知道如何解决它。任何想法？感谢！

I understand the reason why I got the error, but I do not know how to fix it. Any idea? Thanks!

推荐答案

在C ++ 11中，您可以这样初始化：

In C++11 you can initialize it like this:

ABCD() : ObjNum(3), getByte{'a','b','c','d','e','f','g','h'} {}

如果你打算使用C ++ 11，最好使用 std :: array ，因为其他人在评论中建议。然后可以像下面这样定义数组：

If you are going to use C++11, though, it would be better to use std::array as others have suggested in the comments. You could then define the array like:

const std::array<unsigned char, 8> getByte;

并以这种方式初始化（​​注意双括号）：

and initialize it in this way (note the double braces):

ABCD() : ObjNum(3), getByte{{'a','b','c','d','e','f','g','h'}} {}

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