Re: [Boost-users] Boost Serialization calling a customserialize method

Subject: Re: [Boost-users] Boost Serialization calling a customserialize method
From: Pooyan Dadvand (pooyan_at_[hidden])
Date: 2010-08-25 09:12:42

Hi,

First of all thank you for your kind suggestion. I completely agree 
about suggested methodology for optimizing. (Indeed this is the 
methodology I use in my work) However here my concern is the performance 
in normal use of container and not in seriliaztion and optimizing the 
serialization will be a secondary objective.

What I need to know is how to call a MyCostumSerialize method of my 
derive object with an additional parameter via a pointer to the base class:

Class VariableData{
     std::size_t m_Key;
public:

     template<class TArchiveType>
     MyCostumSerialize(TArchiveType&rArchive, const unsigned int Version, void* pValue) {}

};

template<class TDataType>
class Veriable : public VariableData {
public:

     template<class TArchiveType>
     MyCostumSerialize(TArchiveType&rArchive, const unsigned int Version, void* pValue)
     {
         rArchive&  static_cast<TDataType *>(pVAlue);
     }

}

Let say I don't how to call the MyCostumSerialize method of "Variable" 
class above when I have a "VariableData*" pointer in my container:

std::vector<std::pair<const VariableData*, void*>  >

Thanks,

Pooyan.

_______________________________________________________________________________________________________________________________________________________________________________

Dr. Pooyan Dadvand
International Center for Numerical Methods in Engineering - CIMNE
Campus Norte, Edificio C1
c/ Gran Capitán s/n
08034 Barcelona, Spain
Tel:        [phone]
Fax:       [phone]
web:       www.cimne.com <http://www.cimne.com <http://www.cimne.com/>>
_______________________________________________________________________________________________________________________________________________________________________________

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On 08/20/2010 06:57 PM, Robert Ramey wrote:
>> 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
>> http://kratos.cimne.upc.es/trac/browser/kratos/kratos/containers/data_value_container.h)
>>
>> 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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