Question

I can’t create a reference to an unsigned char array z within myfunc(). I’ve tried several ways but just can’t figure it out. This is my most recent attempt:

int myfunc (int &y, unsigned char (&z)[2]);

int main(int argc, char *argv[]) {
 int y = 1;
 unsigned char z[2];

 int x = myfunc(y, z[2]);
}

int myfunc(int &y, unsigned char (&z)[2]) {
 y = 123;
 z[0] = foo;
 z[1] = bar;
 return 456;
}

I am getting the following errors:

error: in passing argument 2 of ‘int myfunc(int&, unsigned char (&)[2])’

For line int myfunc (int &y, unsigned char (&z)[2]);

And:

error: invalid initialization of reference of type ‘unsigned char (&)[2]’ from expression of type ‘unsigned char’

For line int x = myfunc(y, x);

How should I be referencing the array it self (and not an array of references?) ?

Answer 1

myfunc(y, z[2]);

The expression z[2] is of type unsigned char (and refers to an element beyond the end of the array, so it is undefined behavior). You want to do:

myfunc(y, z);