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From: Georg Maubach <mail2george@gmx-topmail.de>
Newsgroups: comp.lang.ada
Subject: Callback in Ada
Date: 27 Nov 2010 09:47:12 GMT
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Date: 2010-11-27T09:47:12+00:00
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Hi All,

today I learnt what a callback function is and also how it is used in 
Python. I have tested the following code which runs in Python:

def apply_to (function, valueList):
   resultList = []

   if __debug__: print "Calling function ", function
   
   for value in valueList:
      if __debug__: print "value: ", value
      r = function (value)
      if __debug__: print "result: ", r
      resultList.append(r)

   return resultList

def dublicate (value):
   return (value * 2)

def power (value):
   return (value * value)

valueList = [1, 2, 3, 4, 5]

double_values = apply_to(dublicate, valueList)
power_values = apply_to(power, valueList)

print "Values doubled: ", double_values
print "Values powered: ", power_values

Reference: http://en.wikipedia.org/wiki/Callback_(computer_science)

If put into a file called "callback-test-in-python.py" and called
python -O callback-test-in-python.py it will deliver the output

Values doubled: 2, 4, 6, 8, 10
Values powered: 1, 4, 9, 16, 25

How would I do that in Ada?

Regards

George