On Jan 10, 2013, at 1:56 PM, Markos Zaharioudakis <[email protected]> wrote:
> Here is the 1st problem: inside mem_sizeof(const XmlNode& t), sizeof(T) (or
> sizeof(t)) should return 52 if t is actually an ElementNode. Of course, this
> is not possible since sizeof(T) is computed statically (i.e., at compile
> time).
Oh. I get it now. That's a serious problem. One solution I can think of is
to have size_traits<T> have another member function... something like
static_sizeof(T const&). Unfortunately the only way that can work is if every
class in a class hierarchy implements a virtual member function static_size()
whose implementation is ALWAYS:
size_t static_size() const {
return sizeof( *this );
}
As for why the template trick doesn't work, I don't know yet. Perhaps it's
because XmlNode doesn't implement its own alloc_size() but instead inherits it
from Item (though I could have sworn I tested this and it worked).
- Paul
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