// Fig. 20.11: Author.cpp
// Author member-function definitions.
#include <fmt/format.h>
#include <iostream>
#include <memory>
#include <string>
#include <string_view>
#include "Author.h"
#include "Book.h"

Author::Author(std::string_view authorName) : name(authorName) {}

Author::~Author() {
   std::cout << fmt::format("Destroying Author: {}\n", name);
}

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




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