From 6655623425548406437 X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: f78e5,8366734ec6aad121 X-Google-Attributes: gidf78e5,public X-Google-ArrivalTime: 1994-06-14 08:38:19 PST Newsgroups: comp.std.c++ Path: nntp.gmd.de!xlink.net!howland.reston.ans.net!swrinde!ihnp4.ucsd.edu!munnari.oz.au!cs.mu.OZ.AU!munta.cs.mu.OZ.AU!fjh From: fjh@munta.cs.mu.OZ.AU (Fergus Henderson) Subject: Re: new foo[0] Message-ID: <9416600.27801@mulga.cs.mu.OZ.AU> Sender: news@cs.mu.OZ.AU Organization: Computer Science, University of Melbourne, Australia References: <1994Jun6.152021.20287@cs.wm.edu> <2tk0dq$6ej@hpsystem1.informatik.tu-muenchen.de> Date: Tue, 14 Jun 1994 14:40:41 GMT Lines: 29 schuenem@Informatik.TU-Muenchen.DE (Ulf Schuenemann) writes: >To implement the delete[]-operator new[] must store information about >size of the array somewhere (Is there a way to do without it?). >I would appreciate if there were a STANDARD for obtaining this >information at runtime (with a new keyword - oh, how ugly. I'll >call it XXX here): I agree that this would be a good idea, but it shouldn't be a new keyword, it should be a library function. >With pa being a kind of reference(pointer) to an array: > > XXX(pa) > >returns the number of elements in the array refered to by pa. >To work in C++ pa must not be a pointer to an element (single object >or somewhere in an array), but a refenence to (the beginning of) >an array. Nah, just make `pa' a pointer and require that it point to the first element of an array allocated using new[], otherwise the behaviour is undefined. template size_t dynamic_array_size(T* pointer_to_first_element); -- Fergus Henderson - fjh@munta.cs.mu.oz.au