private BookSingleton()
{
Author = "Gamma, Helm, Johnson and Vlissides";
Title = "Design Patterns";
Book = null;
IsLoanedOut = false;
}
public static BookSingleton BorrowBook()
{
if (!IsLoanedOut)
{
if (Book == null)
{
Book = new BookSingleton();
}
IsLoanedOut = true;
return(Book);
}
return(null);
}
public void ReturnBook(BookSingleton returnedBook)
{
IsLoanedOut = false;
}