Question

if I wrote like this:

typedef enum {
  foo_1,
  foo_2
}foo ;

I found that I can use

int footype = foo::foo_1 in c++

and I can directly use

int footype = foo_1 in c,

so is there a way that can write same code that works both in c++ and c? the code is inside one header file with only one structure.

Answer 1

int footype = foo_1;

That will compile in both C and C++.

int footype = foo::foo_1;

This syntax is only necessary for C++11’s strongly typed enums.