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

C++ has stricter rules than C regarding enums. You'll need to cast the value to the enumeration type when calling:

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

Alternatively, you can writer a wrapper function that takes an int to do the cast for you, if you want to avoid writing the cast every time you call it:

void do_something_wrapper(int types)
{
    do_something((CEnumType)types);
}
...
do_something_wrapper(C_ENUM_VALUE_APPLE | C_ENUM_VALUE_BANANA);

Though I don't know if I want to see what you get when you cross an apple with a banana...