Initializing an array in a class - expected primary-expression before '{' token

Projects Programming
1

I really like how Arduino allows you to initialize multi-dimensional arrays with this syntax:
int x [][3]= {
{1,2,3},
{11,22,33}
}

However, this does not seem to work in a Class. Below is a short sketch illustrating the error that I get:
"expected primary-expression before '{' token "

What I'm trying to do is to encapsulate a bunch of multi-dimensional shape arrays into a Shape class so I can instantiate a Tetris piece of a particular shape and rotation. Even if there are better way to do this, I'd still be interested in how to pre-initialize an array without having to do this: x[1][2] = 1 repeatedly for every element.

class MyClass
{
  public:
    MyClass();
  private:
    int _predefinedInt;
    int * _predefinedArray;
};

MyClass::MyClass() 
{
  _predefinedInt = 7; // This works fine

  // These work fine but too wordy when I have a big multi-dimension array
//  _predefinedArray[0] = 1; 
//  _predefinedArray[1] = 2;
//  _predefinedArray[2] = 3;

  // *** Error: expected primary-expression before '{' token ***
  _predefinedArray = {0,1,2}; 
};

void setup()
{
  MyClass myClass;
  // blah blah blah
}

void loop()
{
}
2

I received an answer from a friend. Thought I share it here.
The main point is that I was trying to return a pointer to stack variable and use it outside the method.
GetPredefinedArray() copies the predefined memory to a preallocated memory in the main program.
The code below works! Thanks Isaac!

class MyClass
{
  public:
    MyClass();
    void GetPredefinedArray(int **outArr);
  private:
    int _predefinedInt;
};

MyClass::MyClass() 
{
  _predefinedInt = 7;
};

void MyClass::GetPredefinedArray(int **outArr)
{
  int _arr[][4]={ {1,2,3,4}, {11,12,13,14}, {21,22,23,24} };    
  memcpy(outArr, (int**)_arr, sizeof(_arr)); // copy _arr to outArr.
}

void setup()
{
  int gArr[3][4];
  MyClass myClass;
  myClass.GetPredefinedArray( (int **)gArr );
  
  Serial.begin(9600);
  Serial.print(gArr[2][3]);
}

void loop()
{
}