Path: utzoo!attcan!uunet!tut.cis.ohio-state.edu!rutgers!mcnc!palmer
From: palmer@mcnc.org (Thomas C. Palmer)
Newsgroups: comp.lang.c++
Subject: Problem resizing array of pointer to class
Message-ID: <6831@alvin.mcnc.org>
Date: 5 Jul 90 14:10:11 GMT
Organization: MCNC; RTP, NC
Lines: 44


I'm having a problem resizing an array of pointers.  I have a class
Array that has members:

    Type** ary;
    int sz;

The constructor allocates the array with:

    ...
    ary = new Type*[sz = size];
    ...

If the array needs to be resized I call the following:

void Array::resize(int newsz) {
    Type** oldary = ary;
    int i, oldsz = sz;

    sz = ((newsz != 0) ? newsz : (sz < 2 ? (2) : (sz+sz/2)));
    ary = new Type*[sz];

    for(i=0; i<oldsz; i++) ary[i] = oldary[i];
    for(; i<sz; i++) ary[i] = 0;

    delete oldary;
}

The delete statement seems to hose the free store; if removed, everything
works.  I've tried the following replacements with no success:

    delete *oldary;
    delete [oldsz] oldary;
    delete [oldsz] *oldary;

What am I doing wrong?  I'm using g++ 1.37.0 on a Sun 4 (4.0.3).

-Tom

Thomas C. Palmer		North Carolina Supercomputing Center
Cray Research, Inc.		Phone: (919) 248-1117
PO Box 12889			Arpanet: palmer@ncsc.org
3021 Cornwallis Road
Research Triangle Park, NC 27709