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al_fixadd(3) Library Functions Manual al_fixadd(3) NAME al_fixadd - Allegro 5 API SYNOPSIS #include <allegro5/allegro.h> al_fixed al_fixadd(al_fixed x, al_fixed y); DESCRIPTION Although fixed point numbers can be added with the normal + integer op- erator, that doesn't provide any protection against overflow. If over- flow is a problem, you should use this function instead. It is slower than using integer operators, but if an overflow occurs it will set Al- legro's errno and clamp the result, rather than just letting it wrap. Example: al_fixed result; /* This will put 5035 into `result'. */ result = al_fixadd(al_itofix(5000), al_itofix(35)); /* Sets errno and puts -32768 into `result'. */ result = al_fixadd(al_itofix(-31000), al_itofix(-3000)); assert(!al_get_errno()); /* This will fail. */ RETURN VALUE Returns the clamped result of adding x to y, setting Allegro's errno to ERANGE if there was an overflow. SEE ALSO al_fixsub(3), al_fixmul(3), al_fixdiv(3). Allegro reference manual al_fixadd(3)
NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | SEE ALSO
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