How to read a C++ class from file into memory

Thu Mar 22 21:42:58 PDT 2007

"David Finlayson" <david.p.finlayson at gmail.com> wrote in message 
news:etuh4g$2ijp$1 at digitalmars.com...
>I am coming from Python to D, so forgive my limited C/C++ knowledge.
>
> What is the idiomatic way to read a heterogeneous binary structure in D?
>
> In my C++ book, it shows examples of defining a class or struct with the 
> appropriate types and then passing a pointer to this class to fread().
>
> However, in Java or Python I could just read the types directly from a 
> binary stream (including the padding bytes associated with the structure 
> on disk).
>
> How should I do this in D?
>
> I did see this post:
>
> http://www.digitalmars.com/webnews/newsgroups.php?art_group=digitalmars.D.learn&article_id=6071
>
> Note that I ultimately want to store these data back into classes where I 
> can work with it.
>

If you haven't got too many classes/structures to serialize, I've attached a 
module with a simple serialization/deserialization mechanism that works with 
std.stream.  It will automatically serialize out all primitive and array 
types, as well as structures which have no unions.  You can specify custom 
serialization and deserialization methods for classes and structures, and 
you can make structures behave as though they were an opaque chunk of data 
(for performance when reading/writing).  It's very easy to use; to serialize 
anything, you just write:

Serialize(stream, data);

And to deserialize it again:

Deserialize(stream, data);

Defining the custom methods for classes and structs is easy.  The serialize 
function should just be declared as "void serialize(Stream s)" and the 
deserialize function as "static T deserialize(Stream s)", where T is the 
type for which you're defining the deserialize function.

I extracted this code from a larger module, and I think it has everything it 
needs to work, if it doesn't let me know! 

begin 666 cereal.d
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