// Fig. 23.12: Book.cpp
// Member function definitions for class Book.
#include <iostream>
#include <string>
#include <memory>
#include "Author.h"
#include "Book.h"

using namespace std;

Book::Book( const string &bookTitle ) : title( bookTitle )
{
}

Book::~Book()
{
   cout << "Destroying Book: " << title << endl;
} // end of destructor

// print the name of this Book's Author
void Book::printAuthorName()
{
   // if weakAuthorPtr.lock() returns a non-empty shared_ptr
   if ( shared_ptr< Author > authorPtr = weakAuthorPtr.lock() )
   {
      // show the reference count increase and print the Author's name
      cout << "Reference count for Author " << authorPtr->name
         << " is " << authorPtr.use_count() << "." << endl;
      cout << "The book " << title << " was written by " 
         << authorPtr->name << "\n" << endl;
   } // end if
   else // weakAuthorPtr points to NULL
      cout << "This Book has no Author." << endl;
} // end of printAuthorName

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 * (C) Copyright 1992-2012 by Deitel & Associates, Inc. and               *
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