Added custom implementation of strtod() (issue #453)

include/ArduinoJson/Polyfills/math.hpp

@@ -7,10 +7,11 @@
 
 #pragma once
 
-// If Visual Studo <= 2012
-#if defined(_MSC_VER) && _MSC_VER <= 1700
+// If Visual Studo
+#if defined(_MSC_VER)
 
 #include <float.h>
+#include <limits>
 
 namespace ArduinoJson {
 namespace Polyfills {
@@ -23,6 +24,16 @@ template <typename T>
 bool isInfinity(T x) {
   return !_finite(x);
 }
+
+template <typename T>
+T nan() {
+  return std::numeric_limits<T>::quiet_NaN();
+}
+
+template <typename T>
+T inf() {
+  return std::numeric_limits<T>::infinity();
+}
 }
 }
 
@@ -101,6 +112,16 @@ inline bool isInfinity<float>(float x) {
 }
 #endif
 
+template <typename T>
+T nan() {
+  return static_cast<T>(NAN);
+}
+
+template <typename T>
+T inf() {
+  return static_cast<T>(INFINITY);
+}
+
 #if defined(__GNUC__)
 #if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6)
 #pragma GCC diagnostic pop