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Article View: borland.public.cppbuilder.nativeapi
Article #5830

Re: Full Access to 2 GB memory RAM ?

#5830
From: Deniel
Date: Sun, 26 Jun 2005 15:08
40 lines
1808 bytes
>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.

Sorry, i ment of cource to the folowing -

int MySize, *MyBuffer;

MySize = 0.85 * pow( 2, 31 ); // 2^31 = 2GB 
MyBuffer = new int[MySize ]; 


>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.

I don't understand, where exactly is the problem? 

If i whould wrtie this - 

MyBuffer = new int[200]; 

there whould be no problem right? 

but if i write this - 

MyBuffer = new int[0.85 * 0x80000000]; // 85% of 2GB 

Then THERE WILL be a problem.... right?

So where does the problem starts? what is the limit size that
start making problems?

Please describe,

Thanks.
Dani.
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