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Subject: Re: [Boost-users] Boost Serialization calling a customserialize method
From: Robert Ramey (ramey_at_[hidden])
Date: 2010-08-20 12:57:31

> Consider that the data.first is a pointer to the base class and I
> want to call the serialize of the derived class which is not virtual
>> which still looks like a bad idea to me. But it might be what you
>> want.
> Really I'm not aware of a storage mechanism for a heterogeneous
> container without using virtual functions in time of accessing data
> which means less performace for us. In this sudo code the accessing
> mechanism is not menssioned but it is fast and typesafe (it can be
> seen here
> Of course any suggestion will be very welcome!!

First of all - focusing on this aspect of performance at this stage in
development is a bad idea. Try the following:

a) Make your container interface.
b) Implement it using the the easiest method
c) Make a test program for it
d) Profile it
e) Enhance the implementation to improve performance bottlenecks.

That is the fastest way to make the fastest code.

To do this (e), you need to know more about how the serialization library
works internally. Most of this is available in the documentation - but it
would also require investment of effort in studying some of the dozens of
examples and tests included with the library. The serialization library
only uses virtual types for a couple of special types inside the library
implemenation. Even re-constitution of virtual types created by the user
don't use any calls to virtual functions. This should be apparent from study
of the document tests and examples.

Also, for a heterogenous container, you might look at several approaches.
One is a container of boost.variant or boost.any. The former doesn't use
virtual functions at all.

Study of all of this seems like a lot of work - and it is. But ultimately it
will be faster and give a better result than trying to speculate on an
optimal solution and then trying to make the serialization library fit it.
The easiest and best way to make a 12 inch telescope lens is to make a 2
inch one first.

Robert Ramey

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