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add_of(3)		    Library Functions Manual		       add_of(3)

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)

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