now the non-const String::operator[] returns a Char class instead of a

primitive

String.h

@@ -1,6 +1,8 @@
 #pragma once
 #include <iostream>
 #include "StringValue.h"
+#include "Char.h"
+class Char;
 
 
 
@@ -30,12 +32,13 @@ public:
     String& operator+=(char);
     bool operator==(const String&) const;
     const char& operator[](size_t) const;
-    char& operator[](size_t);
+    Char operator[](size_t);
 
     size_t size() const;    // does not include null-terminator
     const char* c_str() const;
 
     friend std::istream& operator>>(std::istream&, String&);
+    friend class Char;
 };
 
 std::ostream& operator<<(std::ostream&, const String&);