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29 * Wrapper for math.h which makes sure we have definitions of all the c99
38 #include "c99_compat.h"
41 /* This is to ensure that we get M_PI, etc. definitions */
42 #if defined(_MSC_VER) && !defined(_USE_MATH_DEFINES)
43 #error _USE_MATH_DEFINES define required when building with MSVC
47 #if !defined(_MSC_VER) && \
48 __STDC_VERSION__ < 199901L && \
49 (!defined(_XOPEN_SOURCE) || _XOPEN_SOURCE < 600) && \
52 static inline long int
55 long int rounded = (long int)(d + 0.5);
57 if (d - floor(d) == 0.5) {
59 rounded += (d > 0) ? -1 : 1;
65 static inline long int
68 long int rounded = (long int)(f + 0.5f);
70 if (f - floorf(f) == 0.5f) {
72 rounded += (f > 0) ? -1 : 1;
78 static inline long long int
81 long long int rounded = (long long int)(d + 0.5);
83 if (d - floor(d) == 0.5) {
85 rounded += (d > 0) ? -1 : 1;
91 static inline long long int
94 long long int rounded = (long long int)(f + 0.5f);
96 if (f - floorf(f) == 0.5f) {
98 rounded += (f > 0) ? -1 : 1;
107 return powf(2.0f, f);
120 * signbit() is a macro on Linux. Not available on Windows.
123 #define signbit(x) ((x) < 0.0f)
128 #define M_PI (3.14159265358979323846)
132 #define M_E (2.7182818284590452354)
136 #define M_LOG2E (1.4426950408889634074)
140 #define FLT_MAX_EXP 128
144 #if defined(fpclassify)
145 /* ISO C99 says that fpclassify is a macro. Assume that any implementation
146 * of fpclassify, whether it's in a C99 compiler or not, will be a macro.
148 #elif defined(__cplusplus)
149 /* For C++, fpclassify() should be defined in <cmath> */
150 #elif defined(_MSC_VER)
151 /* Not required on VS2013 and above. Oddly, the fpclassify() function
152 * doesn't exist in such a form on MSVC. This is an implementation using
153 * slightly different lower-level Windows functions.
157 static inline enum {FP_NAN, FP_INFINITE, FP_ZERO, FP_SUBNORMAL, FP_NORMAL}
160 switch(_fpclass(x)) {
161 case _FPCLASS_SNAN: /* signaling NaN */
162 case _FPCLASS_QNAN: /* quiet NaN */
164 case _FPCLASS_NINF: /* negative infinity */
165 case _FPCLASS_PINF: /* positive infinity */
167 case _FPCLASS_NN: /* negative normal */
168 case _FPCLASS_PN: /* positive normal */
170 case _FPCLASS_ND: /* negative denormalized */
171 case _FPCLASS_PD: /* positive denormalized */
173 case _FPCLASS_NZ: /* negative zero */
174 case _FPCLASS_PZ: /* positive zero */
177 /* Should never get here; but if we do, this will guarantee
178 * that the pattern is not treated like a number.
184 #error "Need to include or define an fpclassify function"
188 /* Since C++11, the following functions are part of the std namespace. Their C
189 * counteparts should still exist in the global namespace, however cmath
190 * undefines those functions, which in glibc 2.23, are defined as macros rather
191 * than functions as in glibc 2.22.
193 #if __cplusplus >= 201103L && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 23))
196 using std::fpclassify;
202 using std::isgreater;
203 using std::isgreaterequal;
205 using std::islessequal;
206 using std::islessgreater;
207 using std::isunordered;
211 #endif /* #define _C99_MATH_H_ */