Using C flag enums in C++

Question

I have a C API that defines an enum like so:

typedef enum
{
  C_ENUM_VALUE_NONE    = 0,
  C_ENUM_VALUE_APPLE   = (1 << 0),
  C_ENUM_VALUE_BANANA  = (1          


        

Answer 1

In the case of bitwise operations, the expression evaluates to a primitive type, i.e. int, long, etc. However, your function takes a non-primitive type (CEnumType). The only way I know of to bypass this is to cast the expression. For example:

do_something((CEnumType) (C_ENUM_VALUE_APPLE | C_ENUM_VALUE_BANANA));