Adding Serialization Support
The object book holds an author name and a book title.
First, you will instantiate book, and add serialization support. This process is identical for both transformations.
class book
{
public:
book ();
book (const RWCString& title, const RWCString& author);
private:
RWCString title_;
RWCString author_;
};
As described in the example in Chapter 5, you must add macros to the header and implementation files to prepare the object for serialization.
To the header file, add the macro RW_DECLARE_VIRTUAL_STREAM_FNS(), which defines the streamContents() member function:class book
{
RW_DECLARE_VIRTUAL_STREAM_FNS(book)
public:
book ();
book (const RWCString& title, const RWCString& author);
private:
RWCString title_;
RWCString author_;
};
Add to the header file:
// Add serialization support
RW_DECLARE_STREAMABLE_AS_SELF(book)
RW_DECLARE_STREAMABLE_POINTER(book)
To the implementation file, first add macros that define insertion and extraction operators for the class members:// Define how book will be serialized
RW_BEGIN_STREAM_CONTENTS(book)
RW_STREAM_ATTR_MEMBER(title,title_)
RW_STREAM_ATTR_MEMBER(author,author_)
RW_END_STREAM_CONTENTS
Then add macros that allow the book object itself to be serialized as a pointer reference:
// Allow a reference to a book to be serialized
RW_DEFINE_STREAMABLE_POINTER(book)
RW_DEFINE_STREAMABLE_AS_SELF(book)
