Thread: How to initialize a private static const array of a private child class in a class?

I've been working on my homework project and now I am to declare a class:

Code:

#define PIECE_SIZE 5
#define PIECE_NUM 2
#include <vector>
class Piece
{
	class InternalPiece
	{
		std::vector<bool> Array;
		
		public:
		InternalPiece(const bool a[])
		{
			for (int i = 0; i < PIECE_SIZE * PIECE_SIZE; ++i)
				Array[i] = a[i];
		}
		bool operator()(const int &x, const int &y) const
		{
			return (bool)Array[x * PIECE_SIZE + y];
		}
	};
	public:
	static const InternalPiece pieces[];

And now how am I to initialize the array `pieces'? Initialize it within the class definition is unavailable:

Code:

error: expected constructor, destructor, or type conversion before ‘=’ token

And so is to initialize when you have a Piece object, since the class InternalPiece is private:

Code:

error: ‘class Piece::InternalPiece’ is private

Anyone knows how to solve this? Great thanks.