unary minus operator applied to unsigned type, result still unsigned

[_Flaviu]

This warning from post title is more an information than a warning: unary minus operator applied to unsigned type, result still unsigned but is signaled here:

static unsigned char buffer[512];
static long long var = -sizeof(buffer) - 1; // <-- warning C4146: unary minus operator applied to unsigned type, result still unsigned

Still, how can I rid of this warning ?

[phil o]

You can cast the result of the sizeof call to a long long prior to apply it the unary minus operator:

static long long var = -((long long)sizeof(buffer)) - 1;

It makes sense when you think of what should the result be when you try to negate a value of a type which does not accept negative values.

"Five fruits and vegetables a day? What a joke! Personally, after the third watermelon, I'm full."

[_Flaviu]

Thanks. That warning has disappeared.