Of course, this is the fastest (sizeChar and BYTE_DEFINE as above)
int c = sizeChar();
All solutions compare the size to char
The third is simplest and is applicable to any class or structure besides basic types. Other two are...
Of course we can create a template to get absolute value from any type of integers:
#define BYTE_SIZE 8
template <typename T>
T mabs(T x)
You can disguise but you can't easily remove if statement since the extraction from an integer is different if the number is positive or negative....
Separate names with a comma.