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Re: Hello, need a helping hand [message #27416 is a reply to message #27405]

Fri, 16 July 2010 12:18

cbpporter is currently offline

cbpporter
Messages: 1401
Registered: September 2007

Ultimate Contributor

jerson wrote on Thu, 15 July 2010 17:46

BTW : what do these statements mean? It's a bit like greek to me.

void UWord::SerializeApp(Stream& s)
{
	int version = 1;
	s / version;                <<== this one here
	s % UWordFs()               <<== and here
	  % PdfFs();                <<== and here
	if(version >= 1)
		s % lrufile();
}

Hi!

Yes, serialization can seem a little bit confusing at first, but this is one my favorite features. It is very easy to serialize large sets of data.

The serialization API uses operator overloading very heavily and "%" is something like "<<" combined with ">>" from standard C++ API (like you use with cout). It is the standard serialization operator. So if you see:

s % foo % bar;

think of it as:

s.serialize(foo).serialize(bar);

This hypothetical serialize method uses chaining and reference parameters, and in pseudo code it has an implementation like this for every basic type:

Stream& serialize(Foo& foo) {
  if (stream is loading)
    foo.loadFromStream
  else 
    foo.saveToStream
  return stream for chaining;
}

This is the reason you don't need to write a separate load and a separate sore serialization function. After you have become more familiar with the syntax, you can look at the implementation if you are curious and you will see that adding support for serializing your own classes is very easy.

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[Message index]

		Hello, need a helping hand By: jerson on Tue, 01 June 2010 15:11
		Re: Hello, need a helping hand By: koldo on Tue, 01 June 2010 15:55
		Re: Hello, need a helping hand By: dolik.rce on Tue, 01 June 2010 16:04
		Re: Hello, need a helping hand By: jerson on Tue, 01 June 2010 20:07
		Re: Hello, need a helping hand By: dolik.rce on Tue, 01 June 2010 20:46
		Re: Hello, need a helping hand By: jerson on Wed, 02 June 2010 03:19
		Re: Hello, need a helping hand By: jerson on Mon, 07 June 2010 06:09
		Re: Hello, need a helping hand By: dolik.rce on Mon, 07 June 2010 08:02
		Re: Hello, need a helping hand By: jerson on Mon, 07 June 2010 09:37
		Re: Hello, need a helping hand By: koldo on Mon, 07 June 2010 09:56
		Re: Hello, need a helping hand By: jerson on Mon, 07 June 2010 10:36
		Re: Hello, need a helping hand By: cbpporter on Mon, 07 June 2010 10:53
		Re: Hello, need a helping hand By: koldo on Mon, 07 June 2010 11:11
		Re: Hello, need a helping hand By: jerson on Mon, 07 June 2010 14:27
		Re: Hello, need a helping hand By: koldo on Mon, 07 June 2010 15:52
		Re: Hello, need a helping hand By: jerson on Thu, 15 July 2010 16:46
		Re: Hello, need a helping hand By: cbpporter on Fri, 16 July 2010 12:18
		Re: Hello, need a helping hand By: jerson on Mon, 02 August 2010 08:05
		Re: Hello, need a helping hand By: koldo on Mon, 02 August 2010 08:59

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