Check for __cplusplus >= 201103L as well as __GXX_EXPERIMENTAL_CXX0X__

Gcc 4.8 defines __cplusplus as 201103L, so we can check for that now. It
still also defines __GXX_EXPERIMENTAL_CXX0X__, but this could help on
other compilers, or if gcc ever decides to stop defining the
experimental macro.

Author: matthijskooijman

cores/arduino/WString.cpp

@@ -43,7 +43,7 @@ String::String(const __FlashStringHelper *pstr)
 	*this = pstr;
 }
 
-#ifdef __GXX_EXPERIMENTAL_CXX0X__
+#if __cplusplus >= 201103L || defined(__GXX_EXPERIMENTAL_CXX0X__)
 String::String(String &&rval)
 {
 	init();
@@ -189,7 +189,7 @@ String & String::copy(const __FlashStringHelper *pstr, unsigned int length)
 	return *this;
 }
 
-#ifdef __GXX_EXPERIMENTAL_CXX0X__
+#if __cplusplus >= 201103L || defined(__GXX_EXPERIMENTAL_CXX0X__)
 void String::move(String &rhs)
 {
 	if (buffer) {
@@ -221,7 +221,7 @@ String & String::operator = (const String &rhs)
 	return *this;
 }
 
-#ifdef __GXX_EXPERIMENTAL_CXX0X__
+#if __cplusplus >= 201103L || defined(__GXX_EXPERIMENTAL_CXX0X__)
 String & String::operator = (String &&rval)
 {
 	if (this != &rval) move(rval);

cores/arduino/WString.h

@@ -59,7 +59,7 @@ class String
 	String(const char *cstr = "");
 	String(const String &str);
 	String(const __FlashStringHelper *str);
-	#ifdef __GXX_EXPERIMENTAL_CXX0X__
+       #if __cplusplus >= 201103L || defined(__GXX_EXPERIMENTAL_CXX0X__)
 	String(String &&rval);
 	String(StringSumHelper &&rval);
 	#endif
@@ -86,7 +86,7 @@ class String
 	String & operator = (const String &rhs);
 	String & operator = (const char *cstr);
 	String & operator = (const __FlashStringHelper *str);
-	#ifdef __GXX_EXPERIMENTAL_CXX0X__
+       #if __cplusplus >= 201103L || defined(__GXX_EXPERIMENTAL_CXX0X__)
 	String & operator = (String &&rval);
 	String & operator = (StringSumHelper &&rval);
 	#endif
@@ -200,7 +200,7 @@ class String
 	// copy and move
 	String & copy(const char *cstr, unsigned int length);
 	String & copy(const __FlashStringHelper *pstr, unsigned int length);
-	#ifdef __GXX_EXPERIMENTAL_CXX0X__
+       #if __cplusplus >= 201103L || defined(__GXX_EXPERIMENTAL_CXX0X__)
 	void move(String &rhs);
 	#endif
 };