Issue #276 - introduce class BSTR_Argument

src/plugin/COM_Value.h

 /**
  * \file COM_Value.h Support for the values used in COM and Automation.
  */
 #ifndef COM_VALUE_H
 #define COM_VALUE_H
 
 #include <wtypes.h>
 #include <string>
 
 namespace AdblockPlus
@@ skipping 72 matching lines @@
       operator std::wstring() const;
 
       /**
        * Address-of operator.
        *
        * This operator is used for assignment directly into our underlying pointer.
        * In order to avoid leaking memory, this operator also implicitly assigns the null string.
        * Specifically, this operator is not 'const'.
        *
        * \par postcondition
-       *   bstr == nullptr
+       *   - bstr == nullptr
+       *   - return value is not null
+       *   - does not throw
        */
-      BSTR* operator&();
+      BSTR* operator&(); // noexcept
 
     private:
       /**
        * Copy constructor is deleted
        */
       BSTR_Argument(const BSTR_Argument&);   // = delete
 
       /**
        * Move constructor is deleted
        */
       BSTR_Argument(BSTR_Argument&&);   // = delete
 
       /**
        * Copy assignment is deleted
        */
       BSTR_Argument& operator=(const BSTR_Argument&);   // = delete
 
       /**
        * Move assignment is deleted
        */
       BSTR_Argument& operator=(BSTR_Argument&&);   // = delete
     };
   }
 }
 
 #endif