Le Sun, 01 Nov 2009 20:34:56 -0500,
Dave Angel <[email protected]> s'exprima ainsi:
> And from what you said earlier, you WILL need function objects, probably
> as parameters to the Simulation constructor. So each instance of
> Simulation will be given several function objects to specify the
> distribution functions for the parameters to be used when creating
> Applicants and Institutions.
A note on "function objects" (because you --Vincent-- seem to regard this
notion as impressive, but maybe I'm wrong).
In python, function objects are functions, no more; all functions (and methods)
are objects. Simply, the fact that they are objects, indeed, is revealed in the
cases where you bind them to a name like any other object.
to an ordinary variable:
if random_choice == GAUSS:
randomFunc = gaussRandom
or to a func parameter:
def produceDistribution(self, randomFunc, more_param):
...
random_results = randomFunc(more_param)
self.distrib = Distribution(results) # if you have type for distrib
This is not so often needed, but your case in the good one.
The feature is present in most high-level languages. But this has not been true
for a long time, especially for mainstream languages of the "imperative" field
(while it was more common, even required, for functional languages). So, this
feature has kept a kind of special prestige and "functions are first-class
objects" often comes early in a list of language features. But there is nothing
exceptional in this for a language like python that basically treats data as
objects, id est that accesses data through references.
Denis
------
la vita e estrany
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