On Dec 7, 3:17 pm, Michael Cumings <mcumi...@narrativescience.com>
wrote:
> I want to be able to build a parameterized class that represents each of
> our major services, and then use a define within that class that will make
> use of the parameters. For example, have a class that represents a
> complete application, which is a virtualenv python application. Then use a
> define within that application instance of the class to add pip installed
> packages to the virtualenv created by the parameterized class.
>
> Is this even possible? What would be the syntax?
I'm not sure whether that's possible, but in any event it's not
necessary. The class can always forward any of its own parameters to
a definition instance via its parameters, and the definition can
access the class's variables (including, I think, its parameters) by
their qualified names. I recommend you separate the class and
definition, and use those tools to provide data to definition
instances. It will be a lot clearer.
If you want to try what you described, however, then the syntax would
be something like this (might not work):
class example::foo ($p, $q) {
# the definition:
define bar ($r) {
# using a definition parameter:
notice { "example-${r}":
# using a class parameter:
message => "${q}"
}
# ...
}
# instantiate of the definition
example::foo::bar {
'baz': r => "$p"
}
}
I have no idea whether you could successfully instantiate the
definition from outside the class (making it function as a closure),
but if so then you would need to be sure to declare the class first.
Afterward, if it's possible to do this at all then the same
instantiation syntax I show above will work outside the class.
John
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