class constants

Hi i'm trying to create a constant variable from within my class, but i just get the error

Quote:

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[C++ Error] Test.h(40): E2233 Cannot initialize a class member here

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Do you have to declare 2d arrays differently from within the class?

Code:

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  static const char Test[3][20] = {{"Test1"}, {"Test2"}, {"Test3"}};

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Thanks.

You cant initialise a variable inside a class.
I'm not sure, but I think you'd have to do it in the constructor.

Code:

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class myClass
  {
  public:
      myClass();
      const int Height;
  };

myClass::myClass()
  {
  Height = 67;
  }

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But if its a static variable, you define it outside the class, like:

Code:

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const char myClass::Test[3][20] = {{"Test1"}, {"Test2"}, {"Test3"}};

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Quote:

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Originally posted by stovellp
You cant initialise a variable inside a class.

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Yes, static const variables can be.

Code:

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//Valid C++
class A
{
  static const int Test  = 1;
};

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I'm not sure why arrays can't be initialized the same way, though.

Only const integers can be done like that sang-drax, nothing else.

Yes, but why are only integral basic data types allowed?
I see no reason.

I wonder that same thing. Not even floating point types can be initialized in a class definition. There's probably some logical reason why they didn't, but I honestly can't think of one.

Hi all, thanks for your replies. I've just had to make the 2d array global, thats the only way i've managed to implement the class.

>>I've just had to make the 2d array global, thats the only way i've managed to implement the class.
Initialize the array just like you do member functions, the declaration is in the class and the definition is outside of the class with named scoping.

Code:

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class test {
  static const char Test[3][20];
  ...
};

const char test::Test[3][20] = {"Test1", "Test2", "Test3"};

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erm.... interesting. I'll have a go at that, thanks cela.

Isn't that what I said in the first place?

>>Isn't that what I said in the first place?
Yep, but important concepts are best repeated. :-)