Re: [Boost-users] Serialization of an instance of a Derived Template Class

1 Nov 2019


      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
     >
     >
     >
     >
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