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/*
Copyright (C) 2018 Daniel Schultz
This file is part of FLINT.
FLINT is free software: you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License (LGPL) as published
by the Free Software Foundation; either version 3 of the License, or
(at your option) any later version. See <https://www.gnu.org/licenses/>.
*/
#include "fmpq.h"
int fmpq_pow_fmpz(fmpq_t a, const fmpq_t b, const fmpz_t e)
{
int e_sgn;
if (fmpq_is_zero(b))
{
e_sgn = fmpz_sgn(e);
if (e_sgn < 0)
flint_throw(FLINT_DIVZERO, "Division by zero in fmpq_pow_fmpz");
fmpz_set_si(fmpq_numref(a), e_sgn == 0 ? 1 : 0);
fmpz_one(fmpq_denref(a));
return 1;
}
else if (fmpz_is_one(fmpq_denref(b)) && fmpz_is_pm1(fmpq_numref(b)))
{
fmpz_set_si(fmpq_numref(a),
fmpz_is_one(fmpq_numref(b)) || fmpz_is_even(e) ? 1 : -1);
fmpz_one(fmpq_denref(a));
return 1;
}
else
{
if (!fmpz_fits_si(e))
return 0;
fmpq_pow_si(a, b, fmpz_get_si(e));
return 1;
}
}