oracular (3) add_of.3.gz

NAME

       add_of - add two integers, check for arithmetic overflow

SYNTAX

       #include <libowfat/rangecheck.h>

       int add_of(dest,a,b);

DESCRIPTION

       If calculating a+b is possible without causing undefined behavior or an arithmetic overflow in C, and the
       sum fits into the destination integer type, do dest=a+b and return 0.

       Otherwise, return 1.

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

BUGS

       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.

SEE ALSO

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

                                                                                                       add_of(3)