Strings now support iterators

Author: cmaglie

CHANGELOG

@@ -6,6 +6,7 @@ SAMD CORE 1.6.6
 * On-board RX-TX LEDs now blinks when there is activity on the native USB port
 * Fixed platform.txt, the core now compiles again with Arduino IDE <=1.6.5. Thanks @per1234
 * Fixed Wire.write(0x00) "ambiguos method" error
+* String class now supports iterators. Thanks @Chris--A
 
 SAMD CORE 1.6.5 2016.04.02
 

cores/arduino/WString.h

@@ -161,6 +161,8 @@ class String
 	void toCharArray(char *buf, unsigned int bufsize, unsigned int index=0) const
 		{getBytes((unsigned char *)buf, bufsize, index);}
 	const char * c_str() const { return buffer; }
+	const char* begin() { return c_str(); }
+	const char* end() { return c_str() + length(); }
 
 	// search
 	int indexOf( char ch ) const;