Comments on: Implicit Fields and Inline Expressions in Delphi Prism Simplify Property Design

By: Olaf Monien

Olaf Monien — Thu, 08 Jan 2009 18:29:37 +0000

I basically meant that these implicit fields were introduced with one of Prism's earlier versions. Prism is a new name that what introduced between “the product's” version 3.0.14 and 3.0.15 (I believe). Somewhen earlier (from 2.0. to 3.0?) the product's name was “Chrome”. I'm not sure what name the product had in 2004, when implicit fields were introduced

By: Fritz

Fritz — Thu, 08 Jan 2009 18:18:56 +0000

The fixed text says: “Implicit Fields exist in Prism since 2004″? Delphi Prism was introduced in (exists since) 2008. Do you mean “Oxygene” instead of “Prism”? Or was there a related product called Prism before Delphi Prism?

By: Joe White

Joe White — Wed, 31 Dec 2008 02:02:42 +0000

Your first example is needlessly noisy — it's poor practice to make a setter method that just assigns the field. Just make the property say “read FHourlyRate write FHourlyRate”.

But yes, Prism's auto properties look nice.

Do you know offhand whether the auto properties can have different visibility for the setter — along the lines of C#'s “{get; private set;}”? I didn't see any examples of that on the wiki. It's really handy, but I'm not sure how their syntax would express it.

By: Mohammed Nasman

Mohammed Nasman — Tue, 16 Dec 2008 23:27:09 +0000

IMO, it's a very nice feature, and I wish CG add it to next Delphi Win32

By: Aleksander Oven

Aleksander Oven — Tue, 16 Dec 2008 21:59:50 +0000

While nice, it may be a bit of an exaggeration to say that inline expressions bring anything new to the table compared to C#. Delphi yes, but not C#. Consider this Oxygenene/Prism property declaration that you wrote:

property WeeklyRate: Double read HourlyRate * HoursPerWeek;

In C#, it would look like this:

double WeeklyRate { get { return HourlyRate * HoursPerWeek; } }

Given above, I think it is more apt to think of inline expressions as a sort of C#-ism in Oxygene/Prism than a genuine advantage over C#.

By: Olaf Monien

Olaf Monien — Tue, 16 Dec 2008 21:28:05 +0000

Oups
Guess the Delphi Prism Wiki needs a “History” …

By: marc hoffman

marc hoffman — Tue, 16 Dec 2008 21:25:56 +0000

“Implicit fields are not an invention of Delphi Prism though, but they were introduced with C# 3.0″

euhm… yes, they are. Oxygene/Prism has had those since 2004, while C# has added them only in 2008