Try to fix VC warning C4512

include/rapidjson/document.h

@@ -322,6 +322,8 @@ private:
     //! Disallow construction from non-const array
     template<SizeType N>
     GenericStringRef(CharType (&str)[N]) /* = delete */;
+
+    GenericStringRef& operator=(const GenericStringRef&);
 };
 
 //! Mark a character pointer as constant string

include/rapidjson/encodedstream.h

@@ -84,6 +84,10 @@ public:
     Ch* PutBegin() { return 0; }
     size_t PutEnd(Ch*) { return 0; }
 
+private:
+    EncodedInputStream(const EncodedInputStream&);
+    EncodedInputStream& operator=(const EncodedInputStream&);
+
     MemoryStream& is_;
 };