Re: AW: More on RPG style

Personally I don't care for the linked list or vector solution - same thing with an array. The second argument to the function has to be populated outside the function call. Of course, that second parameter could be a pointer by value, and then you pass whatever data types you want to it. Not sure whether a pointer can hold operational descriptor info for the underlying variable.

To "look" like the SQL equivalent of IN, I'd want a varying-parameter list. This is pretty easy in C - is it called vararg? It's been too long. But it is there. It's not simple, maybe not even possible, in RPG, since everything has to be explicitly declared.

Vern

Schmidt, Mihael wrote:

One could also use a linked list or vector (take any implementation, f.
e. at www.rpgnextgen.com, www.tools400.de or www.bender-dv.de). Most
implementations have a procedure like list_contains(list :
search_argument).

-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx
[mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of Terrence Enger
Sent: Friday, March 05, 2010 9:22 PM
To: RPG programming on the IBM i / System i
Subject: Re: AW: More on RPG style

On Thu, 2010-03-04 at 15:04 -0600, Vern Hamberg wrote:

Boy, I wonder if it weren't possible to write and IN() function in

RPG.

Maybe pass in the variable you are testing and have an array of the values to test, use some way to vary the count, and return an

indicator.

Woohoo!!!

I think that the best you can do is a function working for one type, and
only allowing up to some fixed maximum number of values to test.

Meanwhile, and expression like "0 < %lookup( ... )" can sometimes
approximate what you want. Of course, sometimes you would rather have
the test values manifest in-line.

Cheers,
Terry.