Ruby
2.4.2p198(2017-09-14revision59899)
missing
isnan.c
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/* public domain rewrite of isnan(3) */
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#include "
ruby/missing.h
"
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/*
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* isnan() may be a macro, a function or both.
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* (The C99 standard defines that isnan() is a macro, though.)
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* http://www.gnu.org/software/automake/manual/autoconf/Function-Portability.html
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*
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* macro only: uClibc
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* both: GNU libc
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*
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* This file is compile if no isnan() function is available.
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* (autoconf AC_REPLACE_FUNCS detects only the function.)
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* The macro is detected by following #ifndef.
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*/
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#ifndef isnan
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static
int
double_ne
(
double
n1,
double
n2);
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int
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isnan
(
double
n)
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{
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return
double_ne
(n, n);
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}
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static
int
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double_ne
(
double
n1,
double
n2)
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{
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return
n1 != n2;
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}
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#endif
isnan
int isnan(double n)
Definition:
isnan.c:22
missing.h
double_ne
static int double_ne(double n1, double n2)
Definition:
isnan.c:28
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