1  /* Define iscanonical macro.
       2     Copyright (C) 2016-2023 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       4  
       5     The GNU C Library is free software; you can redistribute it and/or
       6     modify it under the terms of the GNU Lesser General Public
       7     License as published by the Free Software Foundation; either
       8     version 2.1 of the License, or (at your option) any later version.
       9  
      10     The GNU C Library is distributed in the hope that it will be useful,
      11     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      13     Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public
      16     License along with the GNU C Library; if not, see
      17     <https://www.gnu.org/licenses/>.  */
      18  
      19  #ifndef _MATH_H
      20  # error "Never use <bits/iscanonical.h> directly; include <math.h> instead."
      21  #endif
      22  
      23  /* Return nonzero value if X is canonical.  By default, we only have
      24     IEEE interchange binary formats, in which all values are canonical,
      25     but the argument must still be converted to its semantic type for
      26     any exceptions arising from the conversion, before being
      27     discarded.  */
      28  #define iscanonical(x) ((void) (__typeof (x)) (x), 1)