[Lazarus] How to cast a Interface to a Object in Lazaeus
Michael Van Canneyt
michael at freepascal.org
Fri Mar 13 11:34:09 CET 2015
On Fri, 13 Mar 2015, Martin Schreiber wrote:
> On Friday 13 March 2015 11:06:19 Michael Van Canneyt wrote:
>> On Fri, 13 Mar 2015, Martin Schreiber wrote:
>>> On Friday 13 March 2015 10:49:43 aradeonas wrote:
>>>> OK,So in the end how can I cast a Interface to a Object in Lazarus?
>>> I usually add a "function getinstance(): <theBaseImplemetationClass>" to
>>> the interface definition.
>> Which goes completely against the very purpose of interfaces.
>> If you need this, you should not be using interfaces to begin with.
>> The only possible excuse is an external requirement to use interfaces.
> I do not agree.
No surprise there, I assume you would not have done it otherwise.
It is a free world, after all.
I consider that very wrong design, and this is the reason the OP had to wait
for his answer so long; I tried to provide alternatives for what is in my
personal opinion a unnecessarily complicated and convoluted design.
The fact that no-one else bothered to (or could) reply is IMHO enough of a
hint that the design is maybe not optimal ?
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