Hi Giovanni On Nov 18, 2007 1:59 PM, Giovanni Piero Deretta <gpderetta@gmail.com> wrote:
Maybe you can use SFINAE to detect if a class implements operator new. I'm not sure if it can be done for operator new, it certainly can be done for other member functions.
-- gpd
I think SFINAE is not enough to replicate faithfully the rules employed by the compiler to select the which operator new is called for an expression like new T(a1,..,an) . It will look not only in T, but also in its base classes. I solved differently, by writing an adapter around in_place_factory (that can be found attached). Basically, I create a set of classes typed_out_of_place_factory##N, each inheriting from typed_in_place_factory##N, that provide me the correct apply overload, and a template function to ease the conversion (out_of_place: typed_in_place_factory##N -> typed_out_of_place_factory##N). The only drawback of this, w.r.t. changing in_place_factory to provide this behavior, is that I have to include it always, so the preprocessor magic overhead is always paid. The other solution, the client code would include it only when it is actually used. -- __________________________________________________________________________ dott. Corrado Zoccolo mailto:zoccolo@di.unipi.it PhD - Department of Computer Science - University of Pisa, Italy -------------------------------------------------------------------------- The self-confidence of a warrior is not the self-confidence of the average man. The average man seeks certainty in the eyes of the onlooker and calls that self-confidence. The warrior seeks impeccability in his own eyes and calls that humbleness. Tales of Power - C. Castaneda