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/*
Copyright (C) 2020 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 "ca.h"
#include "ca/impl.h"
#include "ca_field.h"
/* todo: recycle storage when compatible */
void
_ca_make_field_element(ca_t x, ca_field_srcptr field, ca_ctx_t ctx)
{
ca_field_srcptr old_field;
if (field == NULL)
{
flint_throw(FLINT_ERROR, "NULL in _ca_make_field_element\n");
}
old_field = (ca_field_srcptr) (x->field & ~CA_SPECIAL);
if (old_field == field)
{
x->field = (ulong) field; /* unset special status */
return;
}
ca_clear_unchecked(x, ctx);
if (field == ctx->field_qq)
{
*CA_FMPQ_NUMREF(x) = 0;
*CA_FMPQ_DENREF(x) = 1;
}
else if (CA_FIELD_IS_NF(field))
{
nf_elem_init(CA_NF_ELEM(x), CA_FIELD_NF(field));
}
else
{
x->elem.mpoly_q = (fmpz_mpoly_q_struct *) flint_malloc(sizeof(fmpz_mpoly_q_struct));
fmpz_mpoly_q_init(CA_MPOLY_Q(x), CA_FIELD_MCTX(field, ctx));
}
x->field = (ulong) field;
}