/* NaN manipulation.
    Copyright (C) 2010 Pascal Monasse <monasse@imagine.enpc.fr>

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#ifndef NAN_H
#define NAN_H

#include <math.h>

/// Not a number, only for setting a variable.
static const float NaN=sqrt(-1.0f);

/// Test if \a x is \em not NaN
inline bool is_number(float x) {
    return (x==x);
}

#endif