made a char wrapper: Char, which implements copy-on-write for String

Char.cpp

@@ -0,0 +1,20 @@
+#include "Char.h"
+#include <cstring>
+
+
+
+Char::operator char() const
+{ return _string._str->operator[](_index); }
+
+Char& Char::operator=(char other)
+{
+    auto data = new char[_string.size() + 2];   // space for new char & null-terminator
+    std::strcpy(data, _string.c_str());
+    data[_index] = other;
+
+
+    _string._str->operator--();
+    _string._str = new StringValue(data);
+
+    return *this;
+}

Char.h

@@ -0,0 +1,20 @@
+#pragma once
+#include "String.h"
+class String;
+class StringValue;
+
+
+
+class Char
+{
+private:
+
+    size_t _index;
+    String& _string;
+
+public:
+
+    Char(size_t index, String& string) :_index(index), _string(string) {}
+    operator char() const;
+    Char& operator=(char other);
+};