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Dr. Pooyan Dadvand
International Center for Numerical Methods in Engineering - CIMNE
Campus Norte, Edificio C1
c/ Gran Capitán s/n
08034 Barcelona, Spain
Tel:        (+34) 93 401 56 96
Fax:       (+34) 93 401 65 17
web:       www.cimne.com <http://www.cimne.com>
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On 08/27/2010 08:50 PM, Robert Ramey wrote: 
Pooyan Dadvand wrote:

  
But it's not what I'm asking. What I'm asking is a very special case
in which the serialize don't have enough information to deal with my
void* in std::pair<VariableData*, void*> and for this reason I need
the help of VariableData derived class to give the serialization the
necessary type information. Actually I get the following error using
the normal serialization method as you suggest:

/usr/local/include/boost/archive/detail/oserializer.hpp:465: error:
'void*' is not a pointer-to-object type
    
ahh - Ok

std::pair<VariableData*, void*> m_x
...
ar << m_x

of course won't work- my mistake - since there is no way
to determine what the true type is.

So how about one of the following?

struct extradata {
...
};

std::pair<VariableData, extradata> m_x
std::pair<VariableData &, extradata&> m_x
std::pair<VariableData *, extradata*> m_x
std::pair<VariableData*, extradata  &> m_x
...
ar << m_x;
Can you please explain me more the idea of extradata structure? Consider that my extradata can be a double, ublas::vector, or even std::vector<weak_ptr<Element> > or any new type of variables.  I have:
std::vector<std::pair<VariableData, extradata> > mData
...
ar << mData;

and each element of vector can have a different type of data with different size or even have pointers. (It's a heterogeneous container) In this situation I don't know how to implement the extradata structure without knowing the type of variable I'm storing in it.

Robert Ramey 



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Bests,

Pooyan.