[Boost-users] [serialization, 1_33_0] Correct usage and implementation for serializable objects without default constructors.

From: Martin Proulx (mproulx_at_[hidden])
Date: 2005-09-06 14:01:05

Hello,

While using the latest release of boost, I've encountered a few 
questions concerning the usage of the serialization library with objects 
without default constructors.

Here they are:

1-) How can we construct an instance of a serialized object that doesn't 
have a default constructor?

The only option I've figured out is to normally construct an object with 
bogus values, then unserialize the real values while reading from the 
archive.  Example:

X(0) val; // 0 being some bogus value.
inputStream >> val; // Overwrites all values within val;

Is this the correct way to do things?

2-) How should we split the serialization between the class' serialize 
member versus load/save_construct_data?

My observations show that when un/serializing objects directly like 
shown above, load/save_construct_data aren't needed, so the serialize 
member has to handle everything.  When serializing a vector<X>, 
load/save_construct_data does get called, so we have to un/serialize 
some members in those functions as well.  At first glance, it seems some 
members will have to be un/serialized for the second time within 
load/save_construct_data.

Is that correct?  For a class to be correctly un/serializable for all 
cases, load/save_construct_data must un/serialize members that are 
already taken care of in the serialize member?

Thanks!

Martin

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