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CrazyCat
Revered One
Joined: 13 Jan 2002
Posts: 1032
Location: France
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 Posted: Wed Mar 23, 2022 11:36 am Post subject: Accessing a [namespace current] variable |
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Hi there,
I've a little trouble with a script I'm writing. I'm trying to do it really modular with the minimum of hardcoded things.
The code looks like (just an example):
| Code: | namespace eval myns {
variable v
proc doit {} {
# This works
incr [namespace current]::v 1
}
proc readit {} {
# this fails
putlog "v is now $[namespace current]::v"
}
} |
The proc readit doesn't work, I can't figure out how to access $::myns::v using [namespace current]. All ideas are welcome 
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caesar
Mint Rubber
Joined: 14 Oct 2001
Posts: 3741
Location: Mint Factory
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| Posted: Wed Mar 23, 2022 12:29 pm Post subject: |
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| Code: |
namespace eval myns {
variable v
proc doit {} {
incr [namespace current]::v
}
proc readit {} {
variable v
putlog "v is now $v"
}
}
|
Or you can use upvar:
| Code: |
namespace eval myns {
variable v
proc doit {} {
incr [namespace current]::v 1
}
proc readit {} {
upvar 1 [namespace current]::v v
putlog "v is now $v"
}
}
|
Btw, there's no need for the '1' in the incr line as by default it increments with one.
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Once the game is over, the king and the pawn go back in the same box. |
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SpiKe^^
Owner
Joined: 12 May 2006
Posts: 792
Location: Tennessee, USA
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| Posted: Wed Mar 23, 2022 12:38 pm Post subject: |
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The common method using [variable] similar to [global].... | Code: | proc readit {} { ;# common method
variable v
putlog "v is now $v"
} |
Another method I find handy....
| Code: | proc readit {} {
# another method
putlog "v is now [set [namespace current]::v]"
} |
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SpiKe^^
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CrazyCat
Revered One
Joined: 13 Jan 2002
Posts: 1032
Location: France
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| Posted: Wed Mar 23, 2022 1:22 pm Post subject: |
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Thanks guys.
I'll probably use the last method from SpiKe^^ as I'll have to use [namespace parent] sometimes.
Using upvar is a way I'd looked, but it's less flexible imho
_________________
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Offer me a coffee - Do not ask me help in PM, we are a community. |
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