Re: Full Access to 2 GB memory RAM ?

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#5928

From: Thomas Maeder [TeamB]
Date: Sun, 26 Jun 2005 14:56

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"Deniel" <DenielMail@Internet.com> writes:

> Using Builder 4.0 C++ on XP computer, if my PC have 2 GB of RAM
> memory, can i write in my program - 
>
> int *MyBuffer = new int[0.85 * ( 2 ^ 31 )]; 

Yes. But it will not do why you expect it to do.

The operator ^ means 'exclusive or' in C and C++. Since the sets of
bits set in the representations of 2 and 31 are disjoint, the
expression 2^31 will thus evaluate to 33.

The new expression will therefore allocate an array of 28 ints.

> and expect that this buffer will sit whole on the RAM (without 
> paging to the Hard-Disk) and that i'll have full access to all 
> it's cells from  MyBuffer[0] till MyBuffer[1825361100] ? 

There is no portable way to achieve what you are looking for, and I
also wouldn't expect there to be a way at all on most common
platforms.

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Subject: Re: Full Access to 2 GB memory RAM ?
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