flint-sys 0.9.0

Bindings to the FLINT C library
Documentation 
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/*
    Copyright (C) 2016 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 "test_helpers.h"
#include "acb.h"

TEST_FUNCTION_START(acb_sgn, state)
{
    slong iter;

    for (iter = 0; iter < 1000 * 0.1 * flint_test_multiplier(); iter++)
    {
        acb_t x, a, b;
        slong prec;

        acb_init(x);
        acb_init(a);
        acb_init(b);

        acb_randtest_special(x, state, 1 + n_randint(state, 200), 2 + n_randint(state, 100));
        acb_randtest_special(a, state, 1 + n_randint(state, 200), 2 + n_randint(state, 100));

        prec = 2 + n_randint(state, 200);

        acb_sgn(a, x, prec);

        if (acb_is_zero(x))
        {
            acb_zero(b);
        }
        else
        {
            arb_zero(acb_realref(b));
            acb_arg(acb_imagref(b), x, prec);
            acb_exp(b, b, prec);
        }

        if (!acb_overlaps(a, b))
        {
            flint_printf("FAIL: overlap\n\n");
            flint_printf("x = "); acb_printd(x, 15); flint_printf("\n\n");
            flint_printf("a = "); acb_printd(a, 15); flint_printf("\n\n");
            flint_printf("b = "); acb_printd(b, 15); flint_printf("\n\n");
            flint_abort();
        }

        acb_sgn(x, x, prec);

        if (!acb_overlaps(a, x))
        {
            flint_printf("FAIL: aliasing\n\n");
            flint_printf("x = "); acb_printd(x, 15); flint_printf("\n\n");
            flint_printf("a = "); acb_printd(a, 15); flint_printf("\n\n");
            flint_printf("b = "); acb_printd(b, 15); flint_printf("\n\n");
            flint_abort();
        }

        acb_clear(x);
        acb_clear(a);
        acb_clear(b);
    }

    TEST_FUNCTION_END(state);
}