47 lines
2.0 KiB
C++
47 lines
2.0 KiB
C++
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// Fig. 20.12: Book.cpp
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// Book member-function definitions.
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#include <fmt/format.h>
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#include <iostream>
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#include <memory>
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#include <string>
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#include <string_view>
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#include "Author.h"
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#include "Book.h"
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Book::Book(std::string_view bookTitle) : title(bookTitle) {}
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Book::~Book() {
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std::cout << fmt::format("Destroying Book: {}\n", title);
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}
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// print the name of this Book's Author
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void Book::printAuthorName() {
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// if weakAuthorPtr.lock() returns a non-empty shared_ptr
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if (std::shared_ptr<Author> authorPtr{weakAuthorPtr.lock()}) {
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// show the reference count increase and print the Author's name
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std::cout << fmt::format("Reference count for Author {} is {}\n",
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authorPtr->name, authorPtr.use_count());
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std::cout << fmt::format("The book {} was written by {}\n",
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title, authorPtr->name);
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}
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else { // weakAuthorPtr points to NULL
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std::cout << "This Book has no Author.\n";
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}
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}
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/**************************************************************************
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* (C) Copyright 1992-2022 by Deitel & Associates, Inc. and *
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* Pearson Education, Inc. All Rights Reserved. *
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* *
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* DISCLAIMER: The authors and publisher of this book have used their *
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* best efforts in preparing the book. These efforts include the *
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* development, research, and testing of the theories and programs *
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* to determine their effectiveness. The authors and publisher make *
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* no warranty of any kind, expressed or implied, with regard to these *
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* programs or to the documentation contained in these books. The authors *
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* and publisher shall not be liable in any event for incidental or *
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* consequential damages in connection with, or arising out of, the *
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* furnishing, performance, or use of these programs. *
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**************************************************************************/
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