Using expanded types for enumerations or aliased type names:

expanded class MY_ENUMERATION
convert
 value: {INTEGER_32}
feature
 make (value_a: INTEGER_32)
  do
   value := value_a
  end
feature
 value: INTEGER_32
end

It's as simple as that.

This request is retracted, see http://www.eiffelroom.org/node/467 for a demonstration of an Object Oriented way of doing output and byref parameters.

I'm trying to lay out a case for adding parameter passing by value and/or output parameters.

Someone recently asked me how to create a .NET delegate from an Eiffel routine. Ideally it would be nice to simply do:

	my_delegate := (agent my_routine).to_delegate

where `to_delegate' is a query from the ROUTINE class. However this feature does not yet exist.

1. Make sure you have installed Eiffel Studio 6.4 or greater.

2. Check out Eiffel SVN trunk repository and Eweasel SVN repository (https://svn.eiffel.com/eiffelstudio/trunk/eweasel)

3.

Most existing examples on how to do external calls contain a lot of English explanation which can distract people, like myself, who learn by example.

The result

First let's see the results of images in different quality levels.

Intro

We all know about generics as a wonderful help to implement container data structures like lists, sets, bags etc. Much later than Eiffel, object-oriented programming languages like Java and C# have understood that generic parameters are a powerful extension to the type system and remove the need for many casts. So, what else can we do with generics beyond containers?

Sometimes in an application, some actions have to be repeatedly performed in a certain interval. This could for example be some cleanup of external data. To do this I wrote a small class that takes an agent and an interval.

indexing
	description: "Execute an action every interval until stopped."
	author: "Patrick Ruckstuhl <patrick@tario.org>"
	date: "$Date$"

.NET properties are a fundamental part of the CLR and CTS. They are used in a plethora of ways by Microsoft, ISVs and your other developers. For a number of users .NET properties are just a syntactical sugar unifying a getter function and setter routine, and opening up access to encapsulated internal fields.

Introduction

The goal of this tutorial is to show you how you can harness the power of multi-constraint generic type parameters to implement versatile numerical algorithms.