made Char ctor explicit

Char.h

@@ -5,7 +5,6 @@ class StringValue;
 
 
 
-// TODO: think about making ctors explict
 /* This class provides a simple wrapper for a char primitive, and implements
  * copy-on-write semantics for the non-const String::operator[] via some magic */
 class Char
@@ -17,7 +16,7 @@ private:
 
 public:
 
-    Char(size_t index, String& string) :_index(index), _string(string) {}
+    explicit Char(size_t index, String& string) :_index(index), _string(string) {}
     operator char() const;
     Char& operator=(char other);
 };

String.h

@@ -6,7 +6,6 @@ class Char;
 
 
 
-// TODO: think about making ctors explict
 /* Design decisions:
  *              - Everything related to ref-counting is the responsibility of the StringValue class
  *              - Anything dynamically allocated is owned (and thus once deleted) by the StringValue class