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From:	Ross Smith <rosss AT pharos DOT co DOT nz>
To:	"'Hans Horn'" <hannes AT 2horns DOT com>, cygwin AT cygwin DOT com
Subject:	RE: limit for # of items created with "new" ?
Date:	Wed, 25 Sep 2002 14:28:02 +1200
MIME-Version:	1.0

From: Hans Horn [mailto:hannes AT 2horns DOT com]
> 
> // an element of a linked list
> typedef struct node {
>   node (int _v, node* _n) : v(_v), next(_n) {}
>   int   v;
>   node* next;
> };

I'm surprised that compiled; the typedef shouldn't be there.

> int main (int argc, char** argv) {
>   // allocate descriptions of points
>   char** points = new char*[NUM_POINTS]; assert(points);

The assert is superfluous; new is guaranteed never to return null.

>   for (int i = 0; i < NUM_POINTS; i++) {
>     points[i] = new char[2800]; assert(points[i]);
>   }

You're allocating 2800 bytes for each of 85000 entries; that's 238
megabytes so far. You said earlier that it failed when you tried it
with 1.6 million objects (which I take to mean that was the value of
NUM_POINTS). I'm not surprised; that would have tried to allocate
four and a half gigabytes of memory!

> [ lots of code snipped ]

I also recommend that you start learning about the standard library;
you're reinventing a lot of wheels here.

-- 
Ross Smith ...................... Pharos Systems, Auckland, New Zealand

"C++ is to programming as sex is to reproduction. Better ways might
technically exist but they're not nearly as much fun." - Nikolai Irgens
 

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