assign - assign an integer value, check for truncation

       In the multiplication functions, a return value of 1 signals success and 0 failure. In add_of, sub_of and
       assign it's the other way around.

       If  a  and dest have the same type, or the value of a is representable in the type of dest, do dest=a and
       return 0.

       Otherwise, return 1.

       Note: This is a macro, so dest does not have to be a pointer.

       assign - assign an integer value, check for truncation

add_of(3), sub_of(3), imult16(3), umult16(3), imult32(3), umult32(3), imult64(3), umult64(3)

                                                                                                       assign(3)

#include<libowfat/rangecheck.h>

       int assign(dest,a);