Question

For purposes of type checking I would like to define a function on the lines of

void myfunc(type1 a, type2 b)
{
...
}

where type1 and type2 are both typedefed to uint8_t. So far so good, but for sanity and checking purposes (think DbC) I would like to prevent the function being called with a type2 value for the first parameter or a type1 for the second. Sadly, C’s implicit typecasting is against me here. Does anyone know of a way?

Answer 1

You could wrap the two types in a Struct.

typedef struct {
    uint8_t data;
} type1;

typedef struct {
    uint8_t data;
} type2;

Edit:
I don’t like it because you now have to use a.data instead of a