How can I initialize an array

Question

I'm new to CPP, can't find a simple documentation on how to declare a private constant class attribute, and if it should go on the .h or .m

Here's what I have on my Horse.h:

class Horse {
 private:
 static const int body_vertex_quantity = 24;
 float left_ear_vertex_array[ears_vertex_quantity][2] = {
 //
 };
 public:
 draw();
}

But I'm getting

cannot specify explicit initializer of arrays

I have made my research in the following links, but I don't understand the syntax or what they're doing since I'm new to cpp

Initializing a member array in constructor initializer

Error: cannot specify explicit initializer for array

Workaround for error C2536: cannot specify explicit initializer for arrays in Visual Studio 2013

cannot specify explicit initializer for arrays

• Kerrek SB: The second member isn't static.
• Almo: .h or .m? Aren't .m files for Objective-C, not C++? And if you wanted Objective-C++, that's a .mm file, right?
• πάντα ῥεῖ: Do this left_ear_vertex_array { // } in the member initializer list of a constructor function, not in the declaration!
• DollarAkshay: variables cannot be used to declare array size. Instead make it float left_ear_vertex_array[24][2]
• Basile Starynkevitch: If possible, use C++11 and its std::array, otherwise use std::vector