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Subject: Re: [Boost-users] [serialization] compile-time detection of whether serialization is implemented for a class
From: Nelson, Erik - 2 (erik.l.nelson_at_[hidden])
Date: 2012-02-16 13:26:11

Robert Ramey wrote:
> Nelson, Erik - 2 wrote:
> > What I'd like is a compile-time way of detecting that 'A' is not
> > serializable, maybe Boost Type Traits-style, something like
> >
> > is_serializable<A>::value or is_serializable<binary_oarchive,
> > A>::value that can detect whether or not the object has serialization
> > available.
> >
> > If it could work for testing pointer serialization as well
> > (is_serializable<A*>::value or is_ptr_serializable<A>::value) that
> > would be doubly super.
> >
> >
> I'm sure this would be possible and probably not all that hard but
> would likely require a tweak in the serialization library.
> Add a trac item so the idea doesn't get forgotten.

Okay, thanks- I gave that a shot, got a Trac error

Trac detected an internal error: OperationalError: database is locked
The action that triggered the error was:
POST: /newticket

I'll try again later.

In the meantime, I was thinking something along the lines of

template<typename Archive, typename T>
struct HasSerializeOperator
   typedef boost::archive::detail::interface_oarchive<Archive> interface_t;
   template<typename U, Archive& (interface_t::*)(U &)> struct SFINAE {};
   template<typename U> static char Test(SFINAE<U, &interface_t::operator<< >*);
   template<typename U> static int Test(...);
   static const bool value = sizeof(Test<T>(0)) == sizeof(char);

might work, but

HasSerializeOperator<boost::archive::binary_oarchive, A>::value

is always always 'true'... do you think this approach has any merit?



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