[fpc-devel] Parameters must match exactly?

[Martin]

On 17/05/2010 22:10, Marcos Douglas wrote:
> On Mon, May 17, 2010 at 4:24 PM, Florian Klaempfl
> <florian at freepascal.org>  wrote:
>    
>> ... and one uses normally a function and not a var/out parameter.
>>      
> No... If you forget to put a variable to receive the function result
> (a object created), a memory leak will happen.
> The "out" parameter requires a variable.
>    

I am sorry, am I missing the point? The idea is to have a factoruy method
procedure xxx(var SomeFoo: TFooType): Boolean;

so it will return in SomeFoo a newly created object?

As far as I can see that still works very well.

The type *declaration* of the var param and the variable passed in must 
match 100%; so what


var
   FooToBeCreated: TFooType;
begin
   if  xxx(FooToBeCreated) then ...;

that should to nice.
FooToBeCreated can be assigtne a value of TFooType, or any descendant of 
TFooType; which is exactly what a factory is there fore.


Martin