Re: [boost] [serialization] Inherited objects

From: Simon Buchan (simon_at_[hidden])
Date: 2005-10-11 01:36:52

Try not to reply to digests: we lose the Subject at minimum.

Jared McIntyre wrote:
>>Double check that a is polymorphic - that is, that it has at least one
>>virtual function. Then get back to us.
> 
> 
> Yup, the destructors are virtual (and dynamic_cast is working in both directions). However, it works now (see later 
> comment).
> 
> 
>>nope, its correct. This is a little known quirk of C++ syntax. Your second
>>version won't compile on the most conforming compilers.
> 
> 
> Nifty. I swear that didn't compile when I used it on Friday, but now it does. Now that I have changed it to that 
> format, ar.template register_type<derived_one>(), it works. Out of curiosity, what is the difference between calling 
> it that way and calling ar.register_type<derived_one>()? I've not seen that type of format and would be interested in 
> learning more about it.
> 
Here's a hint:
const int i = 2742;

struct foo1
{
        int bar;
};

struct foo2
{
        template <int sz>
        int bar(int i) {return sz + i;}
};

// unused template param
template <int sz>
void fn(foo1& f1, foo2& f2)
{	bool stupidbool = f1.bar<sz>(0);
        int  stupidint  = f2.bar<sz>(0);
}

int main()
{	fn<i>(foo1(), foo2());
}