When compiling the program

//BEGIN
main()
{ int *a=new int[100];
  delete [100]a;
};
//END

with GNU's gcc under Unix, or djgpp under DOS, I receive the following
warning:

test.cc: In function `int  main ()':
test.cc:3: warning: use of array size with vector delete is anachronistic

Why? That warning was totally unexpected! If that's not the way to delete
dynamic arrays, -like the one declared in the second line-, how should it
then be done? Should I ignore the warning? If there isn't any better ways
to it, how do I get rid of the warning? Please help!

        --Morten S. M.

In <1992Aug9.220113.21125@daimi.aau.dk> sabroe@daimi.aau.dk (Morten Sabroe Mortensen) writes:

>When compiling the program

>//BEGIN
>main()
>{ int *a=new int[100];
>  delete [100]a;
>};
>//END

>with GNU's gcc under Unix, or djgpp under DOS, I receive the following
>warning:

>test.cc: In function `int  main ()':
>test.cc:3: warning: use of array size with vector delete is anachronistic

>Why? That warning was totally unexpected! If that's not the way to delete
>dynamic arrays, -like the one declared in the second line-, how should it
>then be done? Should I ignore the warning? If there isn't any better ways
>to it, how do I get rid of the warning? Please help!

*****> See: ARM, pp. 64-65; Stroustrup 2nd ed., pp. 176, 499-500; or
 Lippman 2nd. ed., p. 288.
--
 - Paul J. Lucas    University of Illinois
   AT&T Bell Laboratories  at Urbana-Champaign
   Naperville, IL   pjl@cs.uiuc.edu

In article <1992Aug9.220113.21125@daimi.aau.dk> sabroe@daimi.aau.dk (Morten Sabroe Mortensen) writes:
>When compiling the program
>
>//BEGIN
>main()
>{ int *a=new int[100];
>  delete [100]a;
>};
>//END
>
>with GNU's gcc under Unix, or djgpp under DOS, I receive the following
>warning:
>
>test.cc: In function `int  main ()':
>test.cc:3: warning: use of array size with vector delete is anachronistic

Correct warning (at least IMHO).  anachronistic = out of date, no
longer used.  It should work, but the correct deletion would simply
be:

delete a;

// pretty simple huh.

I say this is correct, because it is the way it is described in
Strousup (sp?) book.  Other  compilers may not be up to the standard
and use the old standard.

--Peter Kocks
  kocks@chemistry.stanford.edu

In article <1992Aug10.232800.2941@leland.Stanford.EDU> kocks@jessica.stanford.edu (Peter Kocks) writes:
>In article <1992Aug9.220113.21125@daimi.aau.dk> sabroe@daimi.aau.dk (Morten Sabroe Mortensen) writes:
>>When compiling the program
>>
>>//BEGIN
>>main()
>>{ int *a=new int[100];
>>  delete [100]a;
>>};
>>//END
>>
>>with GNU's gcc under Unix, or djgpp under DOS, I receive the following
>>warning:
>>
>>test.cc: In function `int  main ()':
>>test.cc:3: warning: use of array size with vector delete is anachronistic
>
>Correct warning (at least IMHO).  anachronistic = out of date, no
>longer used.  It should work, but the correct deletion would simply
>be:
>
>delete a;
>
>// pretty simple huh.
>
>I say this is correct, because it is the way it is described in
>Strousup (sp?) book.  Other  compilers may not be up to the standard
>and use the old standard.
>
>--Peter Kocks
>  kocks@chemistry.stanford.edu
>

No, the correct answer is:
delete []a;

Why?? Simple rule:
If you allocate with "ptr = new object[20];" delete with "delete [] ptr;".
If you allocate with "ptr = new object;" delete with "delete ptr;".

It makes no difference whether object is an internal type (char int long)
or some user type...

Andrew Walduck

P.S. This has *GOT* to be one of the most insidious bugs in C++...execpt
     its a design flaw!!
     On some architectures, it "does the right thing", on others, it silently
     corrupts memory...so...don't confuse delete and delete[].