c++ - Constant array size in class -

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I have a problem in creating an array in the constructor See my code: 

  class Foo {private: const int size; Double * tab; Public: Foo (Int.); }; Foo :: foo (int s): size (s) {tab = new double [size] [size]; }

The creator can not create a new array because the size of the array is not a constant value ... what is wrong in it? I'm sure it's really easy.

P.S. I apologize for my bad english.

tab indicator and assign you a different dimension in a loop separately Will happen. 

  square foo {private: const int size; Double ** tab; Public: Foo (Int.); ~ Foo (); }; Foo :: foo (int s): size (s) {tab = new double * [size]; For (int i = 0; i

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