function not macro for 27 compat

Chris Bartak · Chris Bartak · commit 8decc5aa7e3c · 2018-07-19T08:24:10.000-05:00
diff --git a/pandas/_libs/src/headers/cmath b/pandas/_libs/src/headers/cmath
@@ -6,7 +6,7 @@
 #if defined(_MSC_VER) && (_MSC_VER < 1800)
 #include <cmath>
 namespace std {
-  #define isnan(x) _isnan(x)
+  __inline int isnan(double x) { return _isnan(x); }
   __inline int signbit(double num) { return _copysign(1.0, num) < 0; }
 }
 #else

Original file line number	Diff line number	Diff line change
`@@ -6,7 +6,7 @@`
`6`	`6`	`#if defined(_MSC_VER) && (_MSC_VER < 1800)`
`7`	`7`	`#include <cmath>`
`8`	`8`	`namespace std {`
`9`		`- #define isnan(x) _isnan(x)`
	`9`	`+ __inline int isnan(double x) { return _isnan(x); }`
`10`	`10`	`__inline int signbit(double num) { return _copysign(1.0, num) < 0; }`
`11`	`11`	`}`
`12`	`12`	`#else`