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

Sponsored Content

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..

Corona688

View Public Profile for Corona688

Visit Corona688's homepage!

Find all posts by Corona688

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

Passing Argument to Function

May i know how to pass an argument to a function in a shell script? Sorry, i din stated that it is in a shell script in my previous post. Means: checkStatus() { ........... } read status; I wanna use the status in the function checkstatus, how...

2. Shell Programming and Scripting

Passing a string parameter to a function

I need to pass a parameter to a function in a script. My parameter is a string. When I display the parameter within my function, I only get the first word from string I pass in. How can I make the function receive the whole string (and not terminate at the first space it encounters)?. part of...

3. UNIX for Advanced & Expert Users

Parameter passing in a function

4. Programming

How to return void function pointer

Hello all im trying to build function that will return void function pointer what is mean is ( not working ) the main function void * myClass::getFunction(int type){ if(type==1) return &myClass::Test1; if(type==2) return &myClass::Test2; } void myClass::Test1(){...

5. Shell Programming and Scripting

Passing more than one argument in a function

Hi All, Calling a function with one argument and storing the return value in a shell script is as below:( so far I know) value="`fun_1 "argument1"`" Its working perfectly for me. Can u help me with passing more than one argument and storing the return value Thnaks in advance JS

6. Shell Programming and Scripting

Passing commandline argument to a function

Hi, I have 2 ksh scripts. Script1.ksh contains function definition. script1.ksh function f1() { while getopts a:c: args do case $args in a) ARG1=$OPTARG ;; c) ARG2=$OPTARG ;; \?) echo "Error no valid Arguments passed" esac done echo $ARG1 echo $ARG2 script2.sh

7. Shell Programming and Scripting

Passing sql as parameter to unix function

Hi, I have a function which connects to the db and runs the sql. it works fine when I run it like: function "select empname from emp;" but when I try to pass the sql string to a variable which in turn in fed to the function , it throws error. please advise. Thanks, Arnie.

8. Shell Programming and Scripting

passing argument from one function to another

Hi all, In the given script code . I want to pass the maximum value that variable "i" will have in function DivideJobs () to variable $max of function SubmitCondorJob(). Any help? Thanks #!/bin/bash ...

9. Shell Programming and Scripting

Passing parameter to script, and split the parameter

i am passing input parameter 'one_two' to the script , the script output should display the result as below one_1two one_2two one_3two if then echo " Usage : <$0> <DATABASE> " exit 0 else for DB in 1 2 3 do DBname=`$DATABASE | awk -F "_" '{print $1_${DB}_$2}` done fi

10. Shell Programming and Scripting

Passing command as a function parameter

Hi All, Just trying to implement the below shell script using AIX ksh shell. myfunc { eval "$*" } CMD='ls -la /etc/hosts | awk '{print $9"|"$5}'' myfunc $CMD Keeping getting "|}: not found" errors, any pointers would greatly be appreciated. Kind Regards Ed Please...

LEARN ABOUT CENTOS

set_color

set_color(1)							       fish							      set_color(1)

NAME

       set_color - set_color - set the terminal color

set_color - set the terminal color
   Synopsis
       set_color [-v --version] [-h --help] [-b --background COLOR] [COLOR]

   Description
       Change the foreground and/or background color of the terminal. COLOR is one of black, red, green, brown, yellow, blue, magenta, purple,
       cyan, white and normal.

       o -b, --background Set the background color

       o -c, --print-colors Prints a list of all valid color names

       o -h, --help Display help message and exit

       o -o, --bold Set bold or extra bright mode

       o -u, --underline Set underlined mode

       o -v, --version Display version and exit

       Calling set_color normal will set the terminal color to whatever is the default color of the terminal.

       Some terminals use the --bold escape sequence to switch to a brighter color set. On such terminals, set_color white will result in a grey
       font color, while set_color --bold white will result in a white font color.

       Not all terminal emulators support all these features. This is not a bug in set_color but a missing feature in the terminal emulator.

       set_color uses the terminfo database to look up how to change terminal colors on whatever terminal is in use. Some systems have old and
       incomplete terminfo databases, and may lack color information for terminals that support it. Download and install the latest version of
       ncurses and recompile fish against it in order to fix this issue.

Version 1.23.1							  Sun Jan 8 2012						      set_color(1)