[Boost-users] [serialization - newbie] serializing/deserializing singleton class objects

Subject: [Boost-users] [serialization - newbie] serializing/deserializing singleton class objects
From: Soumen (soumen78_at_[hidden])
Date: 2009-08-04 03:03:57

Hi,

This is query was posted as part of different question. Doing a fresh post
with a new topic as earlier one didn't fetch any response - assuming it may
got lost in the original context.

I'm trying to serialize/deserialize singleton class objects. My code is
similar to following for save/restore:

void save(boost::archive::binary_oarchive &archive)
{
    MyData *data = MyData::instance();

    if (data)          archive << data; 
}

void restore(boost::archive::binary_iarchive &archive)
{
    MyData::cleanup();

    archive >> (MyData *) MyData::instance();
}

My save function works - stores data on disk. But the restore function
doesn't compile.  I get error like following:

error: no match for ‘operator>>’ in ‘archive >> (MyData *)
MyData::instance()’
/boost/1_35_0/include/boost/archive/detail/interface_iarchive.hpp:62: note:
candidates are: Archive&
boost::archive::detail::interface_iarchive<Archive>::operator>>(T&) [with T
= MyData*, Archive = boost::archive::binary_iarchive] 

If I change the 2nd line of restore function in following way, the error
message almost remains same:

MyData *inst = MyData::instance();
archive >> (MyData *) inst;

Please guide me what I'm doing wrongly.

Regards,
~ Soumen
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