Store parsed token as string and allow conversion between various types (issues #64, #69, #90, #93)

include/ArduinoJson/Arduino/Print.hpp

@@ -11,7 +11,7 @@
 #include <stddef.h>
 #include <stdint.h>
 
-// This class reproduces Arduino's Print
+// This class reproduces Arduino's Print class
 class Print {
  public:
   virtual ~Print() {}

include/ArduinoJson/Arduino/String.hpp

@@ -10,7 +10,20 @@
 
 #include <string>
 
-typedef std::string String;
+// This class reproduces Arduino's String class
+class String : public std::string {
+ public:
+  String(const char *cstr = "") : std::string(cstr) {}
+  String(const String &str) : std::string(str) {}
+  explicit String(char c);
+  explicit String(unsigned char);
+  explicit String(int);
+  explicit String(unsigned int);
+  explicit String(long);
+  explicit String(unsigned long);
+  explicit String(float, unsigned char decimalPlaces = 2);
+  explicit String(double, unsigned char decimalPlaces = 2);
+};
 
 #else