// SetFrac64 sets q to x/y and returns q.
func (q *Rat) SetFrac64(x int64, y int64) *Rat {
q.doinit()
// y has to be positive for mpq_set_si
if y < 0 {
x *= -1
y *= -1
}
C.mpq_set_si(&q.i[0], C.long(x), C.ulong(y))
C.mpq_canonicalize(&q.i[0])
return q
}
// SetFrac64 sets z to a/b and returns z.
func (z *Rat) SetFrac64(a, b int64) *Rat {
z.doinit()
if b == 0 {
panic("division by zero")
}
// Detect overflow if running on 32 bits
if a == int64(C.long(a)) && b == int64(C.long(b)) {
if b < 0 {
a = -a
b = -b
}
C.mpq_set_si(&z.i[0], C.long(a), C.ulong(b))
C.mpq_canonicalize(&z.i[0])
if b < 0 {
// This only happens when b = 1<<63
z.Neg(z)
}
} else {
// Slow path but will work on 32 bit architectures
z.SetFrac(NewInt(a), NewInt(b))
}
return z
}
// SetSint sets q to x/y and returns q.
func (q *Rat) SetSint(x int, y uint) *Rat {
q.doinit()
C.mpq_set_si(&q.i[0], C.long(x), C.ulong(y))
return q
}