Vista - passing [switch] parameters

On Jul 28, 1:24 pm, <VR...@newsgroup.nospam> wrote:
> Please help!
>
> So, I have this function X, which among other parameters accepts a switch.
> It also calls another function, say Y, with exactly same set of
> parameters/switches. The trick is that each one of those functions ensures
> there are no additional arguments passed to it.
>
> So, calling X is easy: it's either X or X -mySwitch
> The question is how to call Y from X, in such way so that if mySwitch is
> true, it gets passed to Y, if false it doesn't.
>
> I am looking to do it in one line, since there another 5-10 parameters and
> if I use an 'if' clause, things get messy.
>
> So, what I am looking for is the replacement for this:
> if ($mySwitch) {Y -mySwitch} else {Y}
>
> Thanks in advance for any help.
> VR
>
> Example:
>
> function X([switch] $mySwitch)
> {
> if ($args.Count -ne 0) {throw "no additional arguments allowed";}
>
> # do whatever ...
>
> # the line below is incorrect and causes the problem !!!!
> # what is the correct way of passing that switch on, when the local
> $mySwitch is true and not to pass it, when it's false?
> Y -mySwitch $mySwitch }
>
> function Y([switch] $mySwitch)
> {
> # the line below will throw, since $args.Count is 1
> if ($args.Count -ne 0) {throw "no additional arguments allowed";}
>
> # do whatever ...
>
> }
>
> # call X
> X -mySwitch

Depending on the other parameters, this might get you what you want:

Invoke-Expression ($MyInvocation.Line -replace "X", "Y")

This calls Y in exactly the same way X was called. As long as Y is in
the same scope as X, any non-switch parameters passed to X should be
evaluated accurately in the call to Y.

Good luck.

Jeff

<VRSki@newsgroup.nospam> wrote in message
news:uIy9OaB0HHA.1168@TK2MSFTNGP02.phx.gbl...
> Please help!
>
> So, I have this function X, which among other parameters accepts a switch.
> It also calls another function, say Y, with exactly same set of
> parameters/switches. The trick is that each one of those functions ensures
> there are no additional arguments passed to it.
>
> So, calling X is easy: it's either X or X -mySwitch
> The question is how to call Y from X, in such way so that if mySwitch is
> true, it gets passed to Y, if false it doesn't.
>
> I am looking to do it in one line, since there another 5-10 parameters and
> if I use an 'if' clause, things get messy.

Switch parameters were meant to make it very simple:

function X ([switch]$mySwitch) {
Y -mySwitch:$mySwitch
}

Hope that helps,
Jacques

Please help!

So, I have this function X, which among other parameters accepts a switch.
It also calls another function, say Y, with exactly same set of
parameters/switches. The trick is that each one of those functions ensures
there are no additional arguments passed to it.

So, calling X is easy: it's either X or X -mySwitch
The question is how to call Y from X, in such way so that if mySwitch is
true, it gets passed to Y, if false it doesn't.

I am looking to do it in one line, since there another 5-10 parameters and
if I use an 'if' clause, things get messy.

So, what I am looking for is the replacement for this:
if ($mySwitch) {Y -mySwitch} else {Y}

Thanks in advance for any help.
VR

Example:

function X([switch] $mySwitch)
{
if ($args.Count -ne 0) {throw "no additional arguments allowed";}

# do whatever ...

# the line below is incorrect and causes the problem !!!!
# what is the correct way of passing that switch on, when the local
$mySwitch is true and not to pass it, when it's false?
Y -mySwitch $mySwitch }

function Y([switch] $mySwitch)
{
# the line below will throw, since $args.Count is 1
if ($args.Count -ne 0) {throw "no additional arguments allowed";}

# do whatever ...
}


# call X
X -mySwitch

Of course! I am an iditiot -- I completely forgot about the good old colon!
Thanks Jacues.


"Jacques Barathon [MS]" <jbaratho@online.microsoft.com> wrote in message
news:uZMcJtC0HHA.5772@TK2MSFTNGP02.phx.gbl...
> <VRSki@newsgroup.nospam> wrote in message
> news:uIy9OaB0HHA.1168@TK2MSFTNGP02.phx.gbl...
>> Please help!
>>
>> So, I have this function X, which among other parameters accepts a
>> switch. It also calls another function, say Y, with exactly same set of
>> parameters/switches. The trick is that each one of those functions
>> ensures there are no additional arguments passed to it.
>>
>> So, calling X is easy: it's either X or X -mySwitch
>> The question is how to call Y from X, in such way so that if mySwitch is
>> true, it gets passed to Y, if false it doesn't.
>>
>> I am looking to do it in one line, since there another 5-10 parameters
>> and if I use an 'if' clause, things get messy.
>
> Switch parameters were meant to make it very simple:
>
> function X ([switch]$mySwitch) {
> Y -mySwitch:$mySwitch
> }
>
> Hope that helps,
> Jacques

Jeff,

Thanks for the post.

VR
"Jeff" <jeff.hillman@gmail.com> wrote in message
news:1185523190.063165.182320@k79g2000hse.googlegroups.com...
> On Jul 28, 1:24 pm, <VR...@newsgroup.nospam> wrote:
>> Please help!
>>
>> So, I have this function X, which among other parameters accepts a
>> switch.
>> It also calls another function, say Y, with exactly same set of
>> parameters/switches. The trick is that each one of those functions
>> ensures
>> there are no additional arguments passed to it.
>>
>> So, calling X is easy: it's either X or X -mySwitch
>> The question is how to call Y from X, in such way so that if mySwitch is
>> true, it gets passed to Y, if false it doesn't.
>>
>> I am looking to do it in one line, since there another 5-10 parameters
>> and
>> if I use an 'if' clause, things get messy.
>>
>> So, what I am looking for is the replacement for this:
>> if ($mySwitch) {Y -mySwitch} else {Y}
>>
>> Thanks in advance for any help.
>> VR
>>
>> Example:
>>
>> function X([switch] $mySwitch)
>> {
>> if ($args.Count -ne 0) {throw "no additional arguments allowed";}
>>
>> # do whatever ...
>>
>> # the line below is incorrect and causes the problem !!!!
>> # what is the correct way of passing that switch on, when the local
>> $mySwitch is true and not to pass it, when it's false?
>> Y -mySwitch $mySwitch }
>>
>> function Y([switch] $mySwitch)
>> {
>> # the line below will throw, since $args.Count is 1
>> if ($args.Count -ne 0) {throw "no additional arguments allowed";}
>>
>> # do whatever ...
>>
>> }
>>
>> # call X
>> X -mySwitch
>
> Depending on the other parameters, this might get you what you want:
>
> Invoke-Expression ($MyInvocation.Line -replace "X", "Y")
>
> This calls Y in exactly the same way X was called. As long as Y is in
> the same scope as X, any non-switch parameters passed to X should be
> evaluated accurately in the call to Y.
>
> Good luck.
>
> Jeff
>