#endif
#ifndef INFINITY
+#include <float.h> // DBL_MAX
#define INFINITY (DBL_MAX + DBL_MAX)
#endif
#endif /* _MSC_VER */
-#if __STDC_VERSION__ < 199901L && (!defined(__cplusplus) || defined(_MSC_VER))
+#if (defined(_MSC_VER) && _MSC_VER < 1800) || \
+ (!defined(_MSC_VER) && \
+ __STDC_VERSION__ < 199901L && \
+ (!defined(_XOPEN_SOURCE) || _XOPEN_SOURCE < 600) && \
+ !defined(__cplusplus))
+
static inline long int
lrint(double d)
{
return rounded;
}
+
+static inline float
+exp2f(float f)
+{
+ return powf(2.0f, f);
+}
+
+static inline double
+exp2(double d)
+{
+ return pow(2.0, d);
+}
+
#endif /* C99 */
#endif
+#if defined(fpclassify)
+/* ISO C99 says that fpclassify is a macro. Assume that any implementation
+ * of fpclassify, whether it's in a C99 compiler or not, will be a macro.
+ */
+#elif defined(__cplusplus)
+/* For C++, fpclassify() should be defined in <cmath> */
+#elif defined(_MSC_VER)
+/* Not required on VS2013 and above. Oddly, the fpclassify() function
+ * doesn't exist in such a form on MSVC. This is an implementation using
+ * slightly different lower-level Windows functions.
+ */
+#include <float.h>
+
+static inline enum {FP_NAN, FP_INFINITE, FP_ZERO, FP_SUBNORMAL, FP_NORMAL}
+fpclassify(double x)
+{
+ switch(_fpclass(x)) {
+ case _FPCLASS_SNAN: /* signaling NaN */
+ case _FPCLASS_QNAN: /* quiet NaN */
+ return FP_NAN;
+ case _FPCLASS_NINF: /* negative infinity */
+ case _FPCLASS_PINF: /* positive infinity */
+ return FP_INFINITE;
+ case _FPCLASS_NN: /* negative normal */
+ case _FPCLASS_PN: /* positive normal */
+ return FP_NORMAL;
+ case _FPCLASS_ND: /* negative denormalized */
+ case _FPCLASS_PD: /* positive denormalized */
+ return FP_SUBNORMAL;
+ case _FPCLASS_NZ: /* negative zero */
+ case _FPCLASS_PZ: /* positive zero */
+ return FP_ZERO;
+ default:
+ /* Should never get here; but if we do, this will guarantee
+ * that the pattern is not treated like a number.
+ */
+ return FP_NAN;
+ }
+}
+#else
+#error "Need to include or define an fpclassify function"
+#endif
+
+
#endif /* #define _C99_MATH_H_ */