Thursday, November 25, 2010

C++ Serialization Anyone?

Today I had one of the most amazing programming experiences that I've ever had, from my entire exciting career. I'm still a bit stunned that this happened. I fully thought what happened was completely impossible till now.

At work, we use a lot of different languages to create our software. It's not odd for us to be working on a project which somehow ends up using a dozen languages. Between server code, client code, databases, communication, mark up, styling, pre-processing, dynamic code generation, and other commonality, it's rather easy actually.

Between all these different programming languages, quite often, we need some sort of data interchange format. There's many to choose from, ranging from something custom to something well known like XML. Using these formats, we can pass data from one segment of our application stack to another. Even when they use two different programming languages. Or to save some data, and load it back up later.

When it comes to these things, soft typed functional languages are generally easier to work with than hard typed. Soft typed languages are very good at building objects from data on the fly, thanks to their ability to not care much about what types they're looking at. Is it a number or a string? Doesn't matter to the soft typed language, as they store it all the same way.

When dealing with database access from hard typed languages, the popular method is to create some sort of catch all or convert to anything type. For some, terms like "QVariant" or "boost::any" are always on their lips. The intent of these and similar constructs is to ease things when dealing with data in an unknown type. Although such constructs generally require building a switch block which needs to check some enumeration method to figure out how to handle the data within the rest of the program. Such code is just downright annoying.

At work some time back, thanks to a lot of the new features C++-201x has been adding, we've been able to build a database access library which can handle data without any of these old kludges. Essentially, database access for us in C++ is now just as easy as it is in PHP (or perhaps even easier!).

Now database communication is great, but there's still the issue of data interchange between two programs, which aren't using a database as an intermediary. Many soft typed or functional languages can have a simple encode() or decode() function, pass it any object, and have a nice string representation of it which can be sent off, or saved to a file for later. C++ and related languages always had the nightmare of needing to iterate manually over every data type, or over a hierarchy to work with something like XML, or similar data formats.

There's those that have created workarounds of course. Such as adding a serialize() function for every type you have to work with individually. Or create some serializable objects that one copies data to or from, and which handle all the serialization work internally. Or one of my personal favorites, write a separate parser which can read a description of a format, and generate the C++ objects and code needed to serialize or deserialize it.

Well, today a coworker and I were putting our heads together on how to deal with a certain project. I wrote code some time back which can serialize/deserialize to and from an std::map which contains numbers, strings, or a mix thereof. We were using this data interchange format between two programs. However, now we need to deal with much more complex data, and a series of key pairs just won't cover it. One end of the equation is C++, the other end is a soft typed language which could pretty easily work with whatever we came up with.

We first thought about the option of using a classic method such as XML or JSON, and use some kind of hierarchical writer from C++, and have the soft typed language just read it directly into an object with one of its built in language features. Till my friend had a brilliant realization. The hierarchy of language containers and their children is recursive, as is any serialization that can encode an infinite amount of data stacked in a hierarchy. Then we started discussing if we could make a serialize() function in C++ which could take any C++ type and work, even when not knowing everything about it in advance. It'd be easy for plain old data types, but gets more complicated once we start dealing with containers of those, and containers of containers.

Of course this is where most conversations along these lines end. But then I brought up template meta programming, and some new features C++ is now adding (and already in GCC), and this discussion went on much further than usual, till the point we were talking code. Well, we got into it, and two hours and two hundred lines of code later, we now have a function with the following prototype:

template<typename T>
std::string serialize(const T &t);

It is able to take any type that exists in C++, and well, serialize it. Have some type which contains some types which contains a few more types which contains some other types? It's all serializeable with this function. No pre-processing, dynamic code generation, compiler hacks, or clumsy per program hierarchical parsing required. It just worksTM.

Now next week, we'll have to write the deserializer function to pull that magic in reverse. Using the same idea, it shouldn't be a problem. If the data matches the supplied structure, parse it in, otherwise, throw an error. But currently, our project is done, as we are now able to have our C++ applications send very complex data to our soft typed languages rather easily.

Looking over the code with my coworker, it all seems extremely obvious. Why the heck didn't we think of this 20 years ago? Now am I getting all excited over something that has been done before? Anyone familiar with anything like this?

Question is, what to do now that we know this? File for a patent? (Yes, I'm evil!) Or perhaps ignore this, as no one cares about this topic anyway?


brokenn said...

Sounds very interesting indeed! Any clues as to which c++201X features turned out to be useful for this? I've played around with similar serialisation problems a lot, but never moved over the c++0x for a solution.

Patuti said...

What to do with that?
Share it!

insane coder said...

Hi brokenn.

Aside from the various C++-201x features I already mentioned for this post, there's nothing really more I can say right now.

Roman Perepelitsa said...

Are you saying the serialize function can be used like this?

// Assuming it's in serialize.h.
#include "serialize.h"

// Not a POD.
struct Foo {
std::string val;

int main() {
Foo foo = {"hello"};

I'm pretty sure there is no way to make this work even in C++0x.

Joe P. said...

Roman Perepelitsa, seems you're missing the crucial point here. Seems clear that it's possible. It might need a bit of help, but it looks like not nearly as much help as you seem to think. In fact, most C++ non-PODs can be serialized without extra help.

insane coder said...

Hi Joe P.

True, true. Although there is an important point not to forget. If a class restricts access to its members and provides no way to get them, nothing can be done.

Although you could make the serializer a friend function. A bit of extra work, but not much, as you described.

LB said...

Does it employ variadic templates?

Germán Diago said...

Seriously, if this is like you describe, it's the most important discovering in c++ in years, and... I would like you to share it with all :-)
This would save lots of repetitive coding.
How do you access the members if you
don't know where they stay inside a class?
I see that impossible, but I'm not
sure now.

Germán Diago said...

You got me intrigued, but I'm sure it's impossible to know the structure of a c++ type without some help.
What I came up with is that you can use tuples to describe the structure of a type. But I don't know where the c++0x features fit. Pleeeeeaseeeee... tell us! :-)

蕭刻庭 said...

Interesting... O_O really

tapted said...

I was playing with this a while ago. See

Serialising arbitrary structs was the main challenge. I didn't want to interfere with the class definitions.. There were two ways (check out ser_test.cpp). But you basically had two options. With,

struct XY {int x; int y};

there is a macro SERIALISE_AS_POD(XY);, which would just serialise it as plain 'old data. Or a 'serialiser'. E.g. for:

class XS {
int x;
std::string s;
std::vector v;
XS(int xx = 0) : x(xx), s(x, 'x'), v(3, s) {}

You would define:

SERIALISE_OPT(x, &init_int);
SERIALISE_OPT(s, "default string");
SERIALISE(v); //empty vectors are perfectly valid!

SERIALISE_OPT makes the data members optional in the serialised format. And it supports maps of strings of vectors of structs of maps of strings, etc.

"serialise" then converts any serialisable data into a map of strings->byte[]

The SQL stuff was also a part of it. I basically wanted to convert a struct-"schema" defined this way into an SQL schema.. but it's still a work-in-progress (that hasn't progressed for 17 months)...

蕭刻庭 said...

Recursive serialize a structure is not a new idea, boost::serialization is a perfect example.

And, to serialize everything with only one function is not a new idea, too. boost::fusion has an example to serialize everything with only one function. (well, with few help actually, but no tricky compiler hack, no ugly MACRO, only a typedef)

zbigg said...

I also think that this guy just invented something that "lies" as roots of boost serialization.

(Also this doesn't need C++0x, it works with C++98).

I'm doing this for 2 years from now ... it works for XML, ASN.1/BER, JSON and GUI generation. Nothing particulatly new.

Only thing you need is a
* serializer class with specialized member functions for each type (or type family like std::vector)
* visitor function that calls serializer for each member
* some ugly traits/macrology to distinguish between "agreegates" - structs and leaf types

Well, example - not full here: test_structure_printer.cpp.

Germán Diago said...

"It is able to take any type that exists in C++, and well, serialize it. Have some type which contains some types which contains a few more types which contains some other types? It's all serializeable with this function. No pre-processing, dynamic code generation, compiler hacks, or clumsy per program hierarchical parsing required. It just worksTM."

Do you mean without registering any
single struct field?
Is that the way you did it?

Unknown said...

What happened to this? Did you discover that it was too good to be true? Does it work with boost::any?

insane coder said...

Hi Richard,

We're using the techniques regularly in my company. We do not use Boost at all.

We decided we have more important things to do than try to publish some ideas that may exist in more primitive forms elsewhere, yet remain fully functional, which is why I haven't written about it further.

Unknown said...

That do seem like a sweet lie to me.

And th earrogance of the author speak for itself..

"We decided we have more important things to do than try to publish some ideas that may exist in more primitive forms elsewhere, yet remain fully functional"

this "Way ahead of you" type of person may tend to forget that 6 years after it s publication the only people that come anywhere close to this kind of feature rely and 4 different stage of library in their standard proposition and of course goes for a proposition toward refelctive and mirroring programming.

oh course you could still go for

std::string sayGoodByeToYourData(T& t){
return std::string((char*)&t,sizeof(T)); // Well i m pretty sure that sending pointers ( if the struct contains any) over socket or anything will end up perfectly..i m so gonna post on this tonight!

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ameliasmith010 said...

Hello, I am Amelia Williams Are you using Outlook for personal and professional use? Facing outlook not receiving emails or unable to send any email from an/your account ,So check out guidelines to fix it outlook issues outlook 365 not receiving emails

printersupportnumber said...

Nice Post..
How to obtain quick support to fix HP printer not printing?
From a long time, I am hardly troubling HP printer not printing error. When I give an appropriate command to my HP printer for printing the urgent documents, my printing machine refuses to print the documents. I am applying my all technical ways to print the documents through my HP printer, I am experiencing HP printer not printing issue. I am trying to find out the major causes of HP printer not printing issue. I don’t have perfect technical knowledge to resolve this issue. I have also taken the solutions from from technical experts, but nothing is very helpful. Could you suggest the best methods to solve this technical glitch?

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David Smith said...

David Smith said...

David Smith said...

ameliasmith010 said...

Email messages in MS Outlook now and then stall out in Outbox which portrays that the message has not been sent. Viewpoint clients as a rule protest that they have tapped on send/get button, yet despite moving to beneficiary those messages are remaining in Outbox. The following are the few examined explanations behind the mail stalling out in Outlook Outbox:
Your mail may be having an additional enormous connection, which crosses the breaking point size for sending the mail.
MS Outlook is set to work in disconnected mode with "Work Offline" choice.
The message that stalled out into the Outlook Outbox is really not sent because of any specialized blunder.
Issue may happen in regards to validation settings, Outlook Email Stuck In Outbox account confirmation issues with the mail server.

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emma watson said...

If you have any issues related to Spectrum email login and you want to fix it immediately then you need to read it and follow the directions step by step as they are. Basically, I have a lot of issues to do with this but now I'm just showing you mainly known issues like sending and receiving email. This issue is mostly user-facing every day so I would suggest you solve it with the help of correct spectrum email setting. Now you can follow some instructions such as the username will be your full spectrum address, and password will be the same as a spectrum. After that you can enter the IMAP protocol on the SSL and then the incoming mail server will be and port will be 993. You can also add an outgoing mail server such as, and the port is established to be 587. You can enter the Yes at the end of the required verification section. Then the other thing is getting a lot of undesirable emails or spam emails. So, for piracy purposes, the problem is very important. So, in the inbox section, you can solve this problem by marking the folder as spam and you can move away quickly.

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HP Printer Troubleshooting said...

Sometimes a printer user is unable to locate WPS Pin on their HP printer to setup wireless connection. On some devices is it difficult to find WPS pin number for Wi-Fi protected setup. If you are looking for the pin number then go through the post to find it.