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/*
Copyright (C) 2022 Fredrik Johansson
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 "gr_vec.h"
#include "gr_poly.h"
/* todo: faster code when possible */
truth_t
gr_poly_is_one(const gr_poly_t poly, gr_ctx_t ctx)
{
if (poly->length == 0)
{
return gr_ctx_is_zero_ring(ctx);
}
else if (poly->length == 1)
{
return gr_is_one(poly->coeffs, ctx);
}
else
{
truth_t res1, res2;
res1 = gr_is_one(poly->coeffs, ctx);
if (res1 != T_FALSE)
{
res2 = _gr_vec_is_zero(gr_poly_coeff_srcptr(poly, 1, ctx), poly->length - 1, ctx);
res1 = truth_and(res1, res2);
}
return res1;
}
}