Re: [Boost-users] [Serialization] Restoring from text archive compile error

Subject: Re: [Boost-users] [Serialization] Restoring from text archive compile error
From: Jeff Flinn (TriumphSprint2000_at_[hidden])
Date: 2010-06-25 09:52:14

Dante Stroe wrote:
> Hello,
> 
> I am currently trying to serialize the classes of a project I am working 
> on, but I ran into a few compliation errors and I am kind of stuck, so I 
> was hoping somebody here could help me on that.
> I am using the 1.43 version of the boost library and gcc 4.4.1. (I'd 
> like to add that all the examples in and tutorials from the 
> documentation work fine for me).
> I am trying to serialize a base class called "base" and it's derived 
> class called "de" that use a shared pointer, and afterwards test my 
> implementation by saving the an instance of a "de" object into a text 
> archive and then restoring it.
> 
> These is the serialization implementation for my two classes for reference:
> 
> ---"base.h"-----
> #include<iostream>
> #include<string>
> #include<typeinfo>
> #include "../config.h"
> #include "../population.h"
> #include "../rng.h"
> #include<boost/shared_ptr.hpp>
> #include<boost/archive/text_iarchive.hpp>
> #include<boost/archive/text_oarchive.hpp>
> #include<boost/serialization/version.hpp>
> #include<boost/serialization/base_object.hpp>
> 
> namespace pagmo { namespace algorithm {
> 
> /// Base algorithm class.
> class base;
> 
> /// Alias for shared pointer to base algorithm.
> typedef boost::shared_ptr<base>   base_ptr;
> 
> /// Base algorithm class.
> 
> class __PAGMO_VISIBLE base
> 
> {
>     public:
> 
>         base();
>         /// Evolve method.
>         virtual void evolve(population&p) const = 0;
>         /// Clone method.
>         virtual base_ptr clone() const = 0;
>         virtual ~base();
>         std::string human_readable() const;
>         virtual std::string get_name() const;
>         virtual bool is_blocking() const;
> 
>     protected:
> 
>         virtual std::string human_readable_extra() const;
> 
>     protected:
> 
>         /// Random number generator for double-precision floating point 
> values.
>         mutable rng_double    m_drng;
>         /// Random number generator for unsigned integer values.
>         mutable rng_uint32    m_urng;
> 
>   private:
> 
>         friend class boost::serialization::access;
>     template<class Archive>
>     void serialize(Archive&ar, const unsigned int version){
>         std::cout<<   "Serializing base algorithm"<<   version<<   
> std::endl;
>         }
> 
> };
> }} //namespaces
> 
> std::ostream __PAGMO_VISIBLE_FUNC&operator<<(std::ostream&, const base&);
> --------------------
> 
> --------"de.h"------
> 
> #include<string>
> #include "../config.h"
> #include "../population.h"
> #include "base.h"
> #include<boost/serialization/base_object.hpp>
> 
> namespace pagmo { namespace algorithm {
> 
> class __PAGMO_VISIBLE de: public base {
> 
>   public:
> 
>       de(int, const double&   = 0.8, const double&   = 0.9, int = 2);
>       base_ptr clone() const;
>       void evolve(population&) const;
>       std::string get_name() const;
> 
>   protected:
> 
>       std::string human_readable_extra() const;
> 
>   private:
> 
>       friend class boost::serialization::access;
>       template<class Archive>
>       void serialize(Archive&ar, const unsigned int version){
>       std::cout<<   "Serializing de algorithm"<<   version<<   std::endl;;
>       ar&   boost::serialization::base_object<base>(*this);
>       ar&   m_gen;
>       ar&   m_f;
>       ar&   m_cr;
>       ar&   m_strategy;
>       }
> 
>       const int m_gen;
>       const double m_f;
>       const double m_cr;
>       const int m_strategy;
> };
> 
> }} //namespaces
> ------------------------------
> 
> Saving works fine (and as far as I can tell, based on the documentation 
> examples the information is saved correctly in the text archive). This 
> is the program that I am using to save and restore from archive:

Looks like you are trying to modify const members when de-serializing. 
Can you remove the const's? Again, this is just a quick perusal of your 
posting. You should provide a paired down example demonstrating you 
problem, which will probably lead you to your problems.

Jeff

Jeff