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Free Pascal => Beginners => Topic started by: quantumfoam on October 27, 2021, 02:49:22 pm

Title: Redefine interface
Post by: quantumfoam on October 27, 2021, 02:49:22 pm

I'm trying to translate C++ header files into Pascal. There is lot of cases where interface (just name) is defined:

Code: Pascal  [Select][+][-]

1. INTF1 = interface;

Then it is used in some completely defined interface:

Code: Pascal  [Select][+][-]

1. INTF2 = interface(INTF_BASE)
2.  function intf2_a(p:INTF1):int; stdcall;
3. end;
4.  

And lastly, the interface is fully defined:

Code: Pascal  [Select][+][-]

1. INTF1 = interface(INTF_BASE)
2.  function intf1_x:int; stdcall;
3. end;
4.  

When I try to do this in Free Pascal, I get Duplicate identifier error. How can I redefine interface?

Title: Re: Redefine interface
Post by: marcov on October 27, 2021, 04:19:06 pm

The first declaration is a forward define, and the INTF1 declaration later is fine.

If not, what is your exact code, and what exact error do you get?

Title: Re: Redefine interface
Post by: quantumfoam on October 27, 2021, 04:53:06 pm

The error was "Duplicate identifier". And the reason was, I had the forward declaration in reality defined like

Code: Pascal  [Select][+][-]

1. INTF1 = interface end;

not as actually wrote in question

Code: Pascal  [Select][+][-]

1. INTF1 = interface;

These damn Pascal beginners. :) Thanks.