Definition of Enumerator Constants 

Enumerators are considered defined immediately after their initializers; therefore, they can be used to initialize succeeding enumerators. The following example defines an enumerated type that ensures that any two enumerators can be combined with the OR operator:

// enumerator_constants.cpp
enum FileOpenFlags
{
   OpenReadOnly  = 1,
   OpenReadWrite = OpenReadOnly  << 1,
   OpenBinary = OpenReadWrite << 1,
   OpenText = OpenBinary    << 1,
   OpenShareable = OpenText      << 1
};

int main()
{
}

In this example, the preceding enumerator initializes each succeeding enumerator.

See Also

Reference

C++ Enumeration Declarations