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Member "mpfr-4.0.2/src/isnan.c" (7 Jan 2019, 1078 Bytes) of package /linux/misc/mpfr-4.0.2.tar.gz:

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    1 /* mpfr_nan_p -- check for NaN
    3 Copyright 2000-2001, 2004, 2006-2019 Free Software Foundation, Inc.
    4 Contributed by the AriC and Caramba projects, INRIA.
    6 This file is part of the GNU MPFR Library.
    8 The GNU MPFR Library is free software; you can redistribute it and/or modify
    9 it under the terms of the GNU Lesser General Public License as published by
   10 the Free Software Foundation; either version 3 of the License, or (at your
   11 option) any later version.
   13 The GNU MPFR Library is distributed in the hope that it will be useful, but
   14 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
   15 or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
   16 License for more details.
   18 You should have received a copy of the GNU Lesser General Public License
   19 along with the GNU MPFR Library; see the file COPYING.LESSER.  If not, see
   20 https://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc.,
   21 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */
   23 #include "mpfr-impl.h"
   25 int
   26 (mpfr_nan_p) (mpfr_srcptr x)
   27 {
   28   return MPFR_IS_NAN (x);
   29 }