Ruby 2.7.0p0(2019-12-25revision647ee6f091eafcce70ffb75ddf7e121e192ab217)

isnan.c
Go to the documentation of this file.
1 /* public domain rewrite of isnan(3) */
2
3 #include "ruby/missing.h"
4
5 /*
6 * isnan() may be a macro, a function or both.
7 * (The C99 standard defines that isnan() is a macro, though.)
8 * http://www.gnu.org/software/automake/manual/autoconf/Function-Portability.html
9 *
10 * macro only: uClibc
11 * both: GNU libc
12 *
13 * This file is compile if no isnan() function is available.
14 * (autoconf AC_REPLACE_FUNCS detects only the function.)
15 * The macro is detected by following #ifndef.
16 */
17
18 #ifndef isnan
19 static int double_ne(double n1, double n2);
20
21 int
22 isnan(double n)
23 {
24 return double_ne(n, n);
25 }
26
27 static int
28 double_ne(double n1, double n2)
29 {
30 return n1 != n2;
31 }
32 #endif
isnan
int isnan(double n)
Definition: isnan.c:22
n
const char size_t n
Definition: rb_mjit_min_header-2.7.0.h:5456
missing.h