void overload_inc(pTHX_ SV * p, SV * a, SV * b) {
     mpz_add_ui(*(INT2PTR(mpz_t *, SvIVX(SvRV(p)))), *(INT2PTR(mpz_t *, SvIVX(SvRV(p)))), 1);
}

##</code><code>##

void
overload_inc (p, a, b)
	SV *	p
	SV *	a
	SV *	b
        CODE:
        overload_inc(aTHX_ p, a, b);
        XSRETURN_EMPTY; /* return empty stack */

##</code><code>##

SV * overload_add_eq(pTHX_ SV * p, SV * a, SV * b) {
     mpz_add_ui(*(INT2PTR(mpz_t *, SvIVX(SvRV(p)))), *(INT2PTR(mpz_t *, SvIVX(SvRV(p)))), SvUV(a));
     SvREFCNT_inc(p);
     return p;
}

##</code><code>##

SV *
overload_add_eq (p, a, b)
	SV *	p
	SV *	a
	SV *	b
CODE:
  RETVAL = overload_add_eq (aTHX_ p, a, b);
OUTPUT:  RETVAL

##</code><code>##

void overload_add_eq(pTHX_ SV * p, SV * a, SV * b) {
     mpz_add_ui(*(INT2PTR(mpz_t *, SvIVX(SvRV(p)))), *(INT2PTR(mpz_t *, SvIVX(SvRV(p)))), SvUV(a));
}

##</code><code>##

void
overload_add_eq (p, second, third)
	SV *	p
	SV *	a
	SV *	b
        CODE:
        overload_add_eq(aTHX_ p, a, b);
        XSRETURN_EMPTY; /* return empty stack */