// GobDecode implements the gob.GobDecoder interface.
func (z *Int) GobDecode(buf []byte) error {
if len(buf) == 0 {
return errors.New("Int.GobDecode: no data")
}
b := buf[0]
if b>>1 != intGobVersion {
return errors.New(fmt.Sprintf("Int.GobDecode: encoding version %d not supported", b>>1))
}
z.SetBytes(buf[1:])
if b&1 != 0 {
C.mpz_neg(&z.i[0], &z.i[0])
}
return nil
}
// SetInt64 sets z to x and returns z.
func (z *Int) SetInt64(x int64) *Int {
z.doinit()
// Test for truncation
y := C.long(x)
if int64(y) == x {
C.mpz_set_si(&z.i[0], y)
} else {
negative := false
if x < 0 {
x = -x
negative = true
}
C.mpz_import(&z.i[0], 1, 0, 8, 0, 0, unsafe.Pointer(&x))
if negative {
C.mpz_neg(&z.i[0], &z.i[0])
}
}
return z
}
// Neg sets z = -x and returns z.
func (z *Int) Neg(x *Int) *Int {
x.doinit()
z.doinit()
C.mpz_neg(&z.i[0], &x.i[0])
return z
}
// Neg sets z = -x and returns z.
func (z *Int) Neg(x *Int) *Int {
x.doinit()
z.doinit()
C.mpz_neg(z.ptr, x.ptr)
return z
}