class QString {
private:
    NSMutableString *internalString;
public:
    // Constructors / destructors
    QString() : internalString([[NSMutableString alloc] initWithString:@""]) {}
    QString(const char *cstr) : internalString([[NSMutableString alloc] initWithCString:cstr encoding:NSASCIIStringEncoding]) {}
    ~QString(){ [internalString release]; }

    // Quick access to the internal representation
    NSString *toNSString();

    bool isEmpty();
    bool isNull();
};