c How do I initialize a member array in a constructor?-CodePudding

I am trying to initialize a member array in the default constructor of a class which I've created. However, nothing I've tried has worked. I'm quite new to c and programming in general, and I haven't found the answer I was looking for online yet. In my .hpp file I have:

class thing
{
private:
    std::string array[8][8];
    
public:
    
    thing();
};

And in the corresponding .cpp file I have:

thing::thing()
{
    array =
    {
        {"a", "b", "c", "d", "e", "f", "g", "h"},
        {"a", "b", "c", "d", "e", "f", "g", "h"},
        {"a", "b", "c", "d", "e", "f", "g", "h"},
        {"a", "b", "c", "d", "e", "f", "g", "h"},
        {"a", "b", "c", "d", "e", "f", "g", "h"},
        {"a", "b", "c", "d", "e", "f", "g", "h"},
        {"a", "b", "c", "d", "e", "f", "g", "h"},
        {"a", "b", "c", "d", "e", "f", "g", "h"}
    };
//error: Array type 'std::string [8][8]' is not assignable
}

I've also tried the following:

Board::Board()
{
    std::string array[8][8] =
    {
        {"a", "b", "c", "d", "e", "f", "g", "h"},
        {"a", "b", "c", "d", "e", "f", "g", "h"},
        {"a", "b", "c", "d", "e", "f", "g", "h"},
        {"a", "b", "c", "d", "e", "f", "g", "h"},
        {"a", "b", "c", "d", "e", "f", "g", "h"},
        {"a", "b", "c", "d", "e", "f", "g", "h"},
        {"a", "b", "c", "d", "e", "f", "g", "h"},
        {"a", "b", "c", "d", "e", "f", "g", "h"}
    };
}

Doing it this way doesn't cause any compiler errors, but it doesn't seem to actually work. When I try to cout the elements in the array I get nothing. Is there a way to do what I want to do?

CodePudding user response：

Either use a constructor initializer list, or use a default member initializer.

#include <string>

class thing {
    std::string array[8][8];

public:
    thing();
};

thing::thing()
    : array{
        {"a", "b", "c", "d", "e", "f", "g", "h"},
        {"a", "b", "c", "d", "e", "f", "g", "h"},
        {"a", "b", "c", "d", "e", "f", "g", "h"},
        {"a", "b", "c", "d", "e", "f", "g", "h"},
        {"a", "b", "c", "d", "e", "f", "g", "h"},
        {"a", "b", "c", "d", "e", "f", "g", "h"},
        {"a", "b", "c", "d", "e", "f", "g", "h"},
        {"a", "b", "c", "d", "e", "f", "g", "h"},
    }   
{ }

class thing2 {
    std::string array[8][8] = { 
        {"a", "b", "c", "d", "e", "f", "g", "h"},
        {"a", "b", "c", "d", "e", "f", "g", "h"},
        {"a", "b", "c", "d", "e", "f", "g", "h"},
        {"a", "b", "c", "d", "e", "f", "g", "h"},
        {"a", "b", "c", "d", "e", "f", "g", "h"},
        {"a", "b", "c", "d", "e", "f", "g", "h"},
        {"a", "b", "c", "d", "e", "f", "g", "h"},
        {"a", "b", "c", "d", "e", "f", "g", "h"},
    };  
};

int main() {
    thing t;
    (void)t;

    thing2 t2; 
    (void)t2;
}