const array class member initialization [duplicate]

Question

How to init constant integer array class member? I think that in same case classic array isn't best choice, what should I use instead of it?

class GameInstance{
    enum Signs{
        NUM_SIGNS = 3;
    };
    const int gameRulesTable[NUM_SIGNS][NUM_SIGNS]; //  how to init it?
public:
    explicit GameInstance():gameRulesTable(){};
};

Thanks for your comment, I looked this question, but those question was answered in 2008, and there was some discussion about possible new standart features, which was accepted later in 2011. — vard
– vard, Commented Nov 30, 2012 at 12:57

billz · Accepted Answer · 2012-11-30 13:23:18Z

8

In C++11, you could initialize const array member in an initialization list

class Widget {
public:
  Widget(): data {1, 2, 3, 4, 5} {}
private:
  const int data[5];
};

or

class Widget {
    public:
      Widget(): data ({1, 2, 3, 4, 5}) {}
    private:
      const int data[5];
    };

useful link: http://www.informit.com/articles/article.aspx?p=1852519

http://allanmcrae.com/2012/06/c11-part-5-initialization/

edited Nov 30, 2012 at 13:23

answered Nov 30, 2012 at 13:15

billz

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Comments

Russ Freeman · Accepted Answer · 2012-11-30 14:53:20Z

6

Make it static?

class GameInstance{
    enum Signs{
        NUM_SIGNS = 3};
    static const int gameRulesTable[2][2];
public:
    explicit GameInstance(){};
};

...in your cpp file you would add:
const int GameInstance::gameRulesTable[2][2] = {{1,2},{3,4}};

edited Nov 30, 2012 at 14:53

answered Nov 30, 2012 at 12:55

Russ Freeman

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2 Comments

vard Over a year ago

Unfortunately my compiler doesn't allow this. He said that there is multiple array declaration.

Stals Over a year ago

@vard 'const int GameInstance::gameRulesTable[2][2] = {{1,2},{3,4}};' - this should be in a .cpp file.

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