Hi Robert, I have gone through the documentation. Below is the list of things I did for serialization and deserialization. 1. Define serialize function in the class whose instances I wish to serialize. In my example it is ObjectNew which has pointers of type Bar_A and Foo_A. Both are base classes and the pointers of these pointers point to instances of theri derived classes. So I have serialize function defined for Bar_A, Foo_A and all their derived classes (which includes Foo_C, Foo_D, Bar_B, Bar_C). 2. Call to boost::serialization::base_object in the serialize function of derived classes which in turn calls serialize function of the corresponding base classes. 3. For classes with non-defualt constructor, I have over-ridden save_construct_data and load_construct_data functions. 4. Registering derived classes whose instances are pointed by pointers with types of their base classes using BOOST_CLASS_EXPORT. 5. And finally use boost::archive::text_oarchive and boost::archive::text_iarchive for serialization and deserialization. Please let me know if I have missed something or I am doing something wrong. Pritam Gharat On Thu, Oct 31, 2019 at 5:13 PM Robert Ramey via Boost-users < boost-users@lists.boost.org> wrote:

Have you read the documentation?

Robert Ramey

On 10/31/19 2:47 AM, Pritam Gharat via Boost-users wrote:

...

Hi,

I am using Boost to serialize pointers of a base class which points to instances of a derived template class. I am using boost 1.7.0 and running it on Ubuntu 16.04.

The source code of the example is available at https://github.com/PritamMG/Boost-Serialization-Example

My example has a base class Bar_A (definition available in include/Abstract.hpp) which has a virtual function toStr(). It has two derived classes Bar_B and Bar_C. Bar_B is a template class. I have registered the derived classes in sc/Test.cpp. Class ObjectNew (include/Object.hpp) has a member pointer of type Bar_A which points to instances of classes Bar_B and Bar_C.

I get an error as "unregistered class". I am not sure for which class do I get this error message.

There is also an issue of non-default. If Bar_B does not have a default constructor, save_construct_data and load_construct_data are over-ridden and there I run into an error "too many template-parameter-lists".

How do I define these functions?

Thanks, Pritam

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On Fri, Nov 1, 2019 at 3:51 PM Robert Ramey via Boost-users < boost-users@lists.boost.org> wrote:

On 11/1/19 4:46 AM, Pritam Gharat via Boost-users wrote:

...

Hi Robert,

I have gone through the documentation. Below is the list of things I did for serialization and deserialization.

1. Define serialize function in the class whose instances I wish to serialize. In my example it is ObjectNew which has pointers of type Bar_A and Foo_A. Both are base classes and the pointers of these pointers point to instances of theri derived classes. Not sure I'm getting this. So we have struct Bar_A_base ... struct Foo_A_base ...

struct Bar_A_derived : public Bar_A_base ... struct Foo_A_base : public Bar_A_base ...

struct ObjectNew { Bar_A_base *m_bar_a; Foo_A_base *m_foo_a; ... template<class Archive> void serialize(Archive & ar, const unsigned in version){ ar & m_bar_a; ar & m_foo_a; } };

Right?

Yes. Something similar to that. I am attaching the header files for the class definitions.

...

So I have serialize function defined for Bar_A, Foo_A and all their derived classes (which includes Foo_C, Foo_D, Bar_B, Bar_C).

sounds good

...

2. Call to boost::serialization::base_object in the serialize function of derived classes which in turn calls serialize function of the corresponding base classes. sounds good 3. For classes with non-defualt constructor, I have over-ridden save_construct_data and load_construct_data functions. sounds good 4. Registering derived classes whose instances are pointed by pointers with types of their base classes using BOOST_CLASS_EXPORT. sounds good 5. And finally use boost::archive::text_oarchive and boost::archive::text_iarchive for serialization and deserialization.

sounds good

...

Please let me know if I have missed something or I am doing something wrong.

That sounds about right.

...

Pritam Gharat

On Thu, Oct 31, 2019 at 5:13 PM Robert Ramey via Boost-users mailto:boost-users@lists.boost.org>

wrote:

...

Have you read the documentation?

Robert Ramey

On 10/31/19 2:47 AM, Pritam Gharat via Boost-users wrote: > Hi, > > I am using Boost to serialize pointers of a base class which points to > instances of a derived template class. I am using boost 1.7.0 and > running it on Ubuntu 16.04. > > The source code of the example is available at > https://github.com/PritamMG/Boost-Serialization-Example > > My example has a base class Bar_A (definition available in > include/Abstract.hpp) which has a virtual function toStr(). It has two > derived classes Bar_B and Bar_C. Bar_B is a template class. > I have registered the derived classes in sc/Test.cpp. Class ObjectNew > (include/Object.hpp) has a member pointer of type Bar_A which points to > instances of classes Bar_B and Bar_C. > > I get an error as "unregistered class". I am not sure for which class > do I get this error message. > > There is also an issue of non-default. If Bar_B does not have a default > constructor, save_construct_data and load_construct_data are over-ridden > and there I run into an error "too many template-parameter-lists". > > How do I define these functions? > > Thanks, > Pritam > > > > > _______________________________________________ > Boost-users mailing list > Boost-users@lists.boost.org mailto:Boost-users@lists.boost.org > https://lists.boost.org/mailman/listinfo.cgi/boost-users >

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