author.cpp

里面有很多关于编程的实用例子

// Fig. 21.11: Author.cpp
// Member function definitions for class Author.
#include <iostream>
using std::cout;
using std::endl;

#include <string>
using std::string;

#include "Author.h"
#include "Book.h"
#include "boost/shared_ptr.hpp"
#include "boost/weak_ptr.hpp"

Author::Author( const string &authorName ) : name( authorName )
{
}

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

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

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 * (C) Copyright 1992-2009 by Deitel & Associates, Inc. and               *
 * Pearson Education, Inc. All Rights Reserved.                           *
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