Parameter passing to function with void * as Argument Post: 302903260

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Top Forums Programming Parameter passing to function with void * as Argument Post 302903260 by Corona688 on Monday 26th of May 2014 12:33:06 PM

05-26-2014

Registered User

I repeat, unions do not work that way.

CS and DS were separate structure members originally. Putting them in a union like you suggest, means they will occupy the same memory! Alter CS and DS will change with it.

Furthermore, you say: "An unrequired additional member needlessly increases storage requirements." And then you suggest a structure that still has the "pointless" type element instead! Perhaps you didn't realize that elements in a union occupy the same place in memory... Meaning the "type" I put in the union wasn't an extra element, it was the same element.

The scheme I suggested is the one I see in use in practice in many libraries. I have never seen anyone use a scheme like yours (probably because it wouldn't work).

It comes down to this:

Code:

typedef struct mystr1 {
        int type;
        int payload;
} mystr;


typedef struct mystr2 {
        int type;
        char payload[64];
} mystr2;

typedef union mystr {
        int type;
        mystr1 t1;
        mystr2 t2;
} mystr;

The member labelled in red occupies the same area in memory always. It is not duplicated.

Last edited by Corona688; 05-26-2014 at 01:41 PM..

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LEARN ABOUT DEBIAN

colors

COLORS(3)						   libbash colors Library Manual						 COLORS(3)

NAME

     colors -- libbash library for setting tty colors.

SYNOPSIS

     colorSet	  <color>
     colorReset
     colorPrint   [<indent>] <color> <text>
     colorPrintN  [<indent>] <color> <text>

DESCRIPTION

   General
     colors is a collection of functions that make it very easy to put colored text on tty.

     The function list:
	   colorSet	    Sets the color of the prints to the tty to COLOR
	   colorReset	    Resets current tty color back to normal
	   colorPrint	    Prints TEXT in the color COLOR indented by INDENT (without adding a newline)
	   colorPrintN	    The same as colorPrint, but trailing newline is added

     Detailed interface description follows.

   Available colors:
	   Green
	   Red
	   Yellow
	   White
     The color parameter is non-case-sensitive (i.e. RED, red, ReD, and all the other forms are valid and are the same as Red).

FUNCTIONS DESCRIPTIONS

   colorSet <color>
     Sets the current printing color to color.

   colorReset
     Resets current tty color back to normal.

   colorPrint [<indent>] <color>
     Prints text using the color color indented by indent (without adding a newline).

     Parameters:

       <indent>
	 The column to move to before start printing.  This parameter is optional. If ommitted - start output from current cursor position.

       <color>
	 The color to use.

       <color>
	 The text to print.

   colorPrintN [<indent>] <color>
     The same as colorPrint, except a trailing newline is added.

EXAMPLES

     Printing a green 'Hello World' with a newline:

	  Using colorSet:
		  $ colorSet green
		  $ echo 'Hello World'
		  $ colorReset

	  Using colorPrint:
		  $ colorPrint 'Hello World'; echo

	  Using colorPrintN:
		  $ colorPrintN 'Hello World'

AUTHORS

     Hai Zaar <haizaar@haizaar.com>
     Gil Ran <gil@ran4.net>

SEE ALSO

     ldbash(1), libbash(1)

Linux								       Epoch								     Linux