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eMag Sep 2010 Issue - Prism Edition

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Each month on or after the 1st, and only once a month, we will send you content from up to 5 community groups. If you select this Prism group, you'll receive the following content below mixed in with the other groups you elect to include.

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  September 2010 - Prism Edition Year 12 Issue 9  
I.T. Discussion Community!


Expert guidance from working professionals!
Help Wanted! topic:
Contribute To The Prestwood Community
by Mike Prestwood
We are always looking for talented developers to participate in our message boards, post articles, etc.

IT Water-Cooler for Power-Users topic:
Windows GREP - Great Tool
by Wes Peterson

You know (or think) the file is out there.  You have a pretty good idea about one or two things that are (or ought) to be in it.  Find it fast with Windows GREP.






 Prism Group Top 
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Language Details topic (classic post):
Delphi Prism Overloading (implicit)
by Mike Prestwood

Like Delphi, Prism supports overloading. However, Prism supports implicit overloading (no need for an overload keyword).


OOP topic (classic post):
Delphi Prism Constructors (constructor + class name)
by Mike Prestwood

Prism uses unnamed constructor methods for constructors. Prism also supports a Create constructor method for backward compatibility with Delphi for Win32.


 Monthly Prism Lesson
Language Basics Topic:
Code Snippet of the Month

Prism allows parameters of the same type to be listed together, separated by commas, and followed with a single data type (more params of different data types can follow, after a semi-colon). The default for parameters is by value. For by reference, add var in front of the parameter. Prism also offers constant parameters where you add const in front of the parameter. A constant parameter is like a local constant or read-only parameter the compiler can optimize.

function Add(a, b: integer) : integer; 

begin
  Result := a + b;
end;
 
procedure ReplaceTime(var pDT: TDateTime; const pNewDT: TDateTime);
begin
end;
Tool Basics Topic:
Download of the Month: ShineOn

A Delphi Prism implementation of the Delphi for Win32 RTL.

Language Details Topic:
Resource Link of the Month: The Delphi Prism Primer

Comprehensive introduction by Christian Stelzmann.

Delphi Prism Topic:
Question:

What is the difference between a partial method and an abstract method?


Answer:

Both are very similar in usage. However, a partial method is a callable empty method whereas an abstract method is a defined method in a parent class that must be implemented in a child class. Contrast this with a partial method which can be implemented in a child class but does not have to be. Partial methods are common with code generators for managing events.




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