Private static c++

#ifndef Foo_h
#define Foo_h

class Foo
{
  static const int a = 42; // OK
  static const int b {7};  // OK
  //static int x = 42; // ISO C++ forbids in-class initialization of non-const static member 'Foo::x'
  //static int y {7};  // ISO C++ forbids in-class initialization of non-const static member 'Foo::x'
  static int x;
  static int y;
  int m = 42;
  int n {7};
};

// Foo::x = 42;  // error: 'int Foo::x' is private
int Foo::x = 42; // OK in Foo.h if included in only one  *.cpp -> *.o file!
int Foo::y {7};  // OK

// int Foo::y {7};  // error: redefinition of 'int Foo::y'
   // ONLY if the compiler can see both declarations at the same time it, 
   // OTHERWISE you get a linker error

#endif // Foo_h

Source: stackoverflow.com

Private static c++

class foo
{
    private:
        static int const i = 42;
};

Source: stackoverflow.com

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