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iscanonical.h
/* Define iscanonical macro. ldbl-96 version. Copyright (C) 2016-2018 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library 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 Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see <http://www.gnu.org/licenses/>. */ #ifndef _MATH_H # error "Never use <bits/iscanonical.h> directly; include <math.h> instead." #endif extern int __iscanonicall (long double __x) __THROW __attribute__ ((__const__)); #define __iscanonicalf(x) ((void) (__typeof (x)) (x), 1) #define __iscanonical(x) ((void) (__typeof (x)) (x), 1) #if __HAVE_DISTINCT_FLOAT128 # define __iscanonicalf128(x) ((void) (__typeof (x)) (x), 1) #endif /* Return nonzero value if X is canonical. In IEEE interchange binary formats, all values are canonical, but the argument must still be converted to its semantic type for any exceptions arising from the conversion, before being discarded; in extended precision, there are encodings that are not consistently handled as corresponding to any particular value of the type, and we return 0 for those. */ #ifndef __cplusplus # define iscanonical(x) __MATH_TG ((x), __iscanonical, (x)) #else /* In C++ mode, __MATH_TG cannot be used, because it relies on __builtin_types_compatible_p, which is a C-only builtin. On the other hand, overloading provides the means to distinguish between the floating-point types. The overloading resolution will match the correct parameter (regardless of type qualifiers (i.e.: const and volatile)). */ extern "C++" { inline int iscanonical (float __val) { return __iscanonicalf (__val); } inline int iscanonical (double __val) { return __iscanonical (__val); } inline int iscanonical (long double __val) { return __iscanonicall (__val); } # if __HAVE_DISTINCT_FLOAT128 inline int iscanonical (_Float128 __val) { return __iscanonicalf128 (__val); } # endif } #endif /* __cplusplus */