FloatSpec does not use non-standard C lib anymore

libuavcan/src/marshal/float_spec.cpp

@@ -2,9 +2,18 @@
  * Copyright (C) 2014 Pavel Kirienko <pavel.kirienko@gmail.com>
  */
 
+#include <uavcan/impl_constants.hpp>
 #include <uavcan/marshal/float_spec.hpp>
 #include <cmath>
 
+#if !defined(UAVCAN_CPP_VERSION) || !defined(UAVCAN_CPP11)
+# error UAVCAN_CPP_VERSION
+#endif
+
+#undef signbit
+#undef isnan
+#undef isinf
+
 namespace uavcan
 {
 /*
@@ -15,7 +24,31 @@ namespace uavcan
 template <typename T>
 static inline bool signbit(T arg)
 {
+#if UAVCAN_CPP_VERSION >= UAVCAN_CPP11
+    return std::signbit(arg);
+#else
     return arg < T(0) || (arg == T(0) && T(1) / arg < T(0));
+#endif
+}
+
+template <typename T>
+static inline bool isnan(T arg)
+{
+#if UAVCAN_CPP_VERSION >= UAVCAN_CPP11
+    return std::isnan(arg);
+#else
+    return arg != arg;
+#endif
+}
+
+template <typename T>
+static inline bool isinf(T arg)
+{
+#if UAVCAN_CPP_VERSION >= UAVCAN_CPP11
+    return std::isinf(arg);
+#else
+    return arg == std::numeric_limits<T>::infinity() || arg == -std::numeric_limits<T>::infinity();
+#endif
 }
 
 uint16_t IEEE754Converter::nativeNonIeeeToHalf(float value)
@@ -25,11 +58,11 @@ uint16_t IEEE754Converter::nativeNonIeeeToHalf(float value)
     {
         return hbits;
     }
-    if (isnanf(value))
+    if (isnan(value))
     {
         return hbits | 0x7FFF;
     }
-    if (isinff(value))
+    if (isinf(value))
     {
         return hbits | 0x7C00;
     }