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1 | /* Define iscanonical macro. ldbl-96 version. | |
2 | Copyright (C) 2016-2019 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 | extern int __iscanonicall (long double __x) | |
24 | __THROW __attribute__ ((__const__)); | |
25 | #define __iscanonicalf(x) ((void) (__typeof (x)) (x), 1) | |
26 | #define __iscanonical(x) ((void) (__typeof (x)) (x), 1) | |
27 | #if __HAVE_DISTINCT_FLOAT128 | |
28 | # define __iscanonicalf128(x) ((void) (__typeof (x)) (x), 1) | |
29 | #endif | |
30 | ||
31 | /* Return nonzero value if X is canonical. In IEEE interchange binary | |
32 | formats, all values are canonical, but the argument must still be | |
33 | converted to its semantic type for any exceptions arising from the | |
34 | conversion, before being discarded; in extended precision, there | |
35 | are encodings that are not consistently handled as corresponding to | |
36 | any particular value of the type, and we return 0 for those. */ | |
37 | #ifndef __cplusplus | |
38 | # define iscanonical(x) __MATH_TG ((x), __iscanonical, (x)) | |
39 | #else | |
40 | /* In C++ mode, __MATH_TG cannot be used, because it relies on | |
41 | __builtin_types_compatible_p, which is a C-only builtin. On the | |
42 | other hand, overloading provides the means to distinguish between | |
43 | the floating-point types. The overloading resolution will match | |
44 | the correct parameter (regardless of type qualifiers (i.e.: const | |
45 | and volatile)). */ | |
46 | extern "C++" { | |
47 | inline int iscanonical (float __val) { return __iscanonicalf (__val); } | |
48 | inline int iscanonical (double __val) { return __iscanonical (__val); } | |
49 | inline int iscanonical (long double __val) { return __iscanonicall (__val); } | |
50 | # if __HAVE_DISTINCT_FLOAT128 | |
51 | inline int iscanonical (_Float128 __val) { return __iscanonicalf128 (__val); } | |
52 | # endif | |
53 | } | |
54 | #endif /* __cplusplus */ |