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RE: limit for # of items created with "new" ?
- From: Ross Smith <rosss at pharos dot co dot nz>
- To: 'Hans Horn' <hannes at 2horns dot com>, cygwin at cygwin dot com
- Date: Wed, 25 Sep 2002 14:28:02 +1200
- Subject: RE: limit for # of items created with "new" ?
From: Hans Horn [mailto:hannes@2horns.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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