From: Damian Yerrick <Bullcr_pd_yerrick AT hotmail DOT comRemoveBullcr_p>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: allocated memory size
Organization: Pin Eight Software  http://pineight.8m.com/
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NNTP-Posting-Date: Tue, 23 May 2000 03:01:12 GMT
Distribution: world
Date: Tue, 23 May 2000 03:01:12 GMT
To: djgpp AT delorie DOT com
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Reply-To: djgpp AT delorie DOT com

On 22 May 2000 12:57:37 GMT, Hans-Bernhard Broeker
<broeker AT physik DOT rwth-aachen DOT de> wrote:

>Kalum Somaratna aka Grendel <kalum AT lintux DOT cx> wrote:
>[...]
>> Actually Why would you need to know how much of bytes has been allocated
>> to a pointer...
>
>In a nutshell: dynmically sized arrays. 
>
>What a C++ programmer would implement using the 'vector<>' template
>can be implemented in C by a data structure containing a pointer to
>allocated memory, plus two variables: one to hold the current size of
>that array, and another that tells up to which place the array is
>currently filled.

// NOT ANSI C!!!
// This is GNU C and perhaps C99.  It uses zero-size arrays.

typedef struct vector_int
{
  int _sizeInMem; // the current size of the array in core
  int _numElems;  // up to which place the array is currently filled
  int v[0];       // the data
} vector_int;

-- 
Damian Yerrick
"I refuse to listen to those who refuse to listen to reason."
See the whole sig: http://www.rose-hulman.edu/~yerricde/sig.html

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