Is it possible to have a non-const reference variable as an OPTIONAL/DEFAULT parameter to c++ function
ex
void read(string &data,int &type=0 /*or something*/) ;
so i will call
read(data);
//or
int type;
read(data,type);
printf("Type =%d",type);
I found one dirty workaround
... (2 Replies)
field 12345 12345
field 12345
field 12345 123456
last fleld (from three) is optional, but if it occures It has to be composed only of nummbers and maximum 5 positions long.
If I use:
grep "^field \{5\}"
I get:
field 12345 12345
field 12345
field 12345 123456
But I wont... (11 Replies)
Hello,
On Aix 5.2, we changed the parameters tcp_keepinit, tcp_keepintvl and tcp_keepidle with the no command.
tunrestore -R is present in inittab
in the directory /etc/tunables we can clearly see the inclusion of parameters during reboot, including the file lastboot.log
... (0 Replies)
Hello,
I have a shell script "Test.ksh" and I need to pass 8 parameters/arguments while executing the script
./Test.ksh 1 2 3 4 5 6 7 8
Out of these I want first 3 to be compulsory and rest 5 to be optional. Can you suggest the way to do this like and also how to pass these optional... (3 Replies)
In the below code
while getopts :rfw:d:s:a: options
do
case "$options" in
r) echo reverse;;
f) echo forward;;
w) window=$OPTARG;;
d) duration=$OPTARG;;
s) search=$OPTARG;;
a) value=$OPTARG;;
*) help; exit;;
esac
done
... (2 Replies)
How to declare the two argument for optional switch ?
I have a script that search for a string in current or old zipped log file.
Im using a option something like this
${basename}
Since $1 can have only one argument should be passed when user select swicth -c and -o need to... (3 Replies)
Here is my script:
#!/bin/ksh
usage ()
{
echo " Usage: $0 <opt1> <opt2> <opt3> <opt4>"
}
if ; then
usage
exit;
fi
prog -a $1 -b $2 -c $3 -d $4 2>&1 | tee -a ~/$1.log
I want argument 4 to be optional, so if there's no argument for opt4, that it doesn't... (8 Replies)
Hi Friends,
I have the following input parameters file
name
input
err1
out1
1
40G
DET
sylamer
dir1
dir2
123456
I want to make the following script
#!/bin/bash
# (5 Replies)
Please forgive but I am new to Linux and still learning. When installing Linux (any flavor) over PXE, it asks if you want to customize which packages to install. Most engineers ask us to install all packages but this entails A LOT of clicking. Is there a way to "select all" packages by using a... (3 Replies)
Hi Unix Gurus,
i am on learning path of unix, and yet to discover many things. I came across with this requirement where i need to pass parameters but the position of parameters is not fixed so after doing some google search got to know "getopts" can handle that. So here is my code:
function... (3 Replies)
Discussion started by: gnnsprapa
3 Replies
LEARN ABOUT DEBIAN
autouse
autouse(3perl) Perl Programmers Reference Guide autouse(3perl)NAME
autouse - postpone load of modules until a function is used
SYNOPSIS
use autouse 'Carp' => qw(carp croak);
carp "this carp was predeclared and autoused ";
DESCRIPTION
If the module "Module" is already loaded, then the declaration
use autouse 'Module' => qw(func1 func2($;$));
is equivalent to
use Module qw(func1 func2);
if "Module" defines func2() with prototype "($;$)", and func1() has no prototypes. (At least if "Module" uses "Exporter"'s "import",
otherwise it is a fatal error.)
If the module "Module" is not loaded yet, then the above declaration declares functions func1() and func2() in the current package. When
these functions are called, they load the package "Module" if needed, and substitute themselves with the correct definitions.
WARNING
Using "autouse" will move important steps of your program's execution from compile time to runtime. This can
o Break the execution of your program if the module you "autouse"d has some initialization which it expects to be done early.
o hide bugs in your code since important checks (like correctness of prototypes) is moved from compile time to runtime. In particular,
if the prototype you specified on "autouse" line is wrong, you will not find it out until the corresponding function is executed. This
will be very unfortunate for functions which are not always called (note that for such functions "autouse"ing gives biggest win, for a
workaround see below).
To alleviate the second problem (partially) it is advised to write your scripts like this:
use Module;
use autouse Module => qw(carp($) croak(&$));
carp "this carp was predeclared and autoused ";
The first line ensures that the errors in your argument specification are found early. When you ship your application you should comment
out the first line, since it makes the second one useless.
AUTHOR
Ilya Zakharevich (ilya@math.ohio-state.edu)
SEE ALSO perl(1).
perl v5.14.2 2011-09-19 autouse(3perl)