Re: [Boost-users] Boost Serialization calling a custom serialize method

18 Aug 2010

      Hi again,

In this project the variable is in charge of storing all information about
any data (like DISPLACEMENT) which is its name, default value, unique key,
etc, and perform all necessary operations with its type of data. In
serializing std::pair<const VariableData*, void*> who knows the type of the
value pointed by the void* is the Variable pointed by a base class pointer.
So for serializing I need to call a method of Variable (which has the type
information) and pass the void* which is the value to be store. This value
can be a simple double, ublas matrix or even more complex classes. I know
that this looks strange from OO point of view but the variable itself don't
have any pointer to its value because there are few hundred variables in
Kratos and in a normal analysis we have to store millions of values in the
data structure. So using the variable as handler of its value will cause a
very big overhead of memory which is not acceptable.

Thanks,

Pooyan.

-----Original Message-----
From: boost-users-bounces@lists.boost.org
[mailto:boost-users-bounces@lists.boost.org] On Behalf Of Robert Ramey
Sent: 18 August 2010 18:18
To: boost-users@lists.boost.org
Subject: Re: [Boost-users] Boost Serialization calling a custom serialize
method

Pooyan Dadvand wrote:
...
Hi,
I'm trying to use the boost serialization in our project "Kratos" (a
Multi-physics finite element code) in which I found the following
problem, I have a class Variable which is derived from VariableData
as follow:
Class VariableData
{
                std::size_t mKey;
public:
.....
};
template<class TDataType>
class Variable : public VariableData
{
....
}
Seems to me that what would work is:

Class VariableData{
    std::size_t m_Key;
public:
    virtual ~VariableData() = 0;
};

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

This would work with the library in a normal way.
...
Now I have a container which holds a pairs, consist of VariableData
pointer to the Variable and a void* pointer to its value:
std::vector<std::pair<const VariableData*, void*> >
I can't understand what the "void *" could possibly be useful for here.
Nor can I understand why you would use it.  The whole idea
of trying to serialize a "void *" seems totally non-sensical to me. I have
no idea how or way one would want to do this.

Robert Ramey

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