flint3-sys 3.2.3

Rust bindings to the FLINT C library
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/*
    Copyright (C) 2023 Jean Kieffer

    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 "acb_theta.h"

static int
acb_theta_eld_contains_rec(const acb_theta_eld_t E, const slong * pt)
{
    slong d = acb_theta_eld_dim(E);
    slong c = pt[d - 1];
    slong k;

    if (c < acb_theta_eld_min(E)
        || c > acb_theta_eld_max(E))
    {
        return 0;
    }
    else if (d == 1)
    {
        return 1;
    }
    else if (c >= acb_theta_eld_mid(E))
    {
        k = c - acb_theta_eld_mid(E);
        return acb_theta_eld_contains_rec(acb_theta_eld_rchild(E, k), pt);
    }
    else
    {
        k = acb_theta_eld_mid(E) - 1 - c;
        return acb_theta_eld_contains_rec(acb_theta_eld_lchild(E, k), pt);
    }
}

int
acb_theta_eld_contains(const acb_theta_eld_t E, const slong * pt)
{
    slong g = acb_theta_eld_ambient_dim(E);
    slong d = acb_theta_eld_dim(E);
    slong k;

    if (acb_theta_eld_nb_pts(E) == 0)
    {
        return 0;
    }

    for (k = d; k < g; k++)
    {
        if (pt[k] != acb_theta_eld_coord(E, k))
        {
            return 0;
        }
    }

    return acb_theta_eld_contains_rec(E, pt);
}