Re: [Boost-users] [serialization] how to serialize boost::function

15 Sep 2009

      An interesting topic which I've yet to find time to address.

You're trying to serialize a pointer to a function.  This is not implemented 
within the library.

I would suggest a couple of ideas.

Make each f1, f2...  a function object.
Make a boost::variant and serialize that.  The library already 
supports serialization of variants.

Another idea would be to dervive all function objects from a common base

struct fbase {
    virtual void operator()(int a) = 0; // makes fbase polymorphic
}

and serialize through a base class pointer

struct foo {
    fbase * f;
    std::vector functors_;
    void init(){
        functors_.pushback(& f1...);
};

Robert Ramey

Igor R wrote:
...
Hello,
Is it possible to serialize the following class:
struct foo
{
void f1(int a)
{}
void f2(const std::string& s)
{}
void init()
               {
using boost::bind;
functors_.push_back(bind(&foo::f1, this, 1));
functors_.push_back(bind(&foo::f2, this, "test"));
               }
std::vector > functors_;
};
That is, I'd like save the functors, in order to run them later, when
the object is loaded from the archive.
A straightforward attempt fails:
struct foo
{
//......
friend class boost::serialization::access;
template<class Archive> void serialize(Archive &ar, const unsigned
int version) {
ar & BOOST_SERIALIZATION_NVP(functors_);
}
};
1>d:\dev\servision\projects\windows\thirdparty\boost\boost\serialization\access.hpp(109)
...
error C2039: 'serialize' : is not a member of
'boost::function<Signature>'