Re: [fpc-pascal] Problems with generics

[bartek]

On Sunday 30 December 2007 07:32:22 Micha Nelissen wrote:
> bartek wrote:
> >                 function HashOf(const Key: ShortString): DWord;
> > 
> >                 function BucketNodeOf(const Hash: DWord): TBucket.PNode;
> > DataContainers.pp(104,66) Fatal: Syntax error, ";" expected but "." found
> 
> I'd say this is a bug, and your syntax is correct. Update the existing
> bug report, perhaps?
> 
> Micha
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> 

I am not quite sure whether my synatx is correct. IMHO explictly defining the 
type feels more pascalish. Having more time at hand i have written a much 
shorter example code which shows in what way such a type should be defined.

Now I get:

[1004] [EMAIL PROTECTED]:~/Dev/Tests
% fpc test3.pp
Free Pascal Compiler version 2.3.1 [2007/12/28] for i386
Copyright (c) 1993-2007 by Florian Klaempfl
Target OS: Linux for i386
Compiling test3.pp
test3.pp(18,32) Error: Error in type definition
test3.pp(26,34) Error: Type "TPT" is not completely defined
test3.pp(47,18) Error: Identifier not found "TPT"
test3.pp(49,24) Error: Identifier not found "Data"
test3.pp(54) Fatal: There were 4 errors compiling module, stopping
Fatal: Compilation aborted
Error: /usr/bin/ppc386 returned an error exitcode (normal if you did not 
specify a source file to be compiled)

"Error in a type definition". I do not know whether fpc is supposed to support 
this kind if structures. If it is than it is a bug otherwise, no.

Code:

{$mode objfpc}{$h+}
program test3;
uses classes, sysutils;
type
        generic TNode<T> = class
        type public
                PT = ^T;
        var private
                Data: T;
        public
                constructor Create;
                destructor Destroy; override;
        end;

        generic TContainer<T> = class
        type public
                TTNode = specialize TNode<T>;
                TPT = TTNode.PT;
        var
        private
                Data: TTNode;
        public
                constructor Create;
                destructor Destroy; override;

                function Get: TPT;
        end;

constructor TNode.Create;
begin
end;

destructor TNode.Destroy;
begin
        inherited Destroy;
end;

constructor TContainer.Create;
begin
end;

destructor TContainer.Destroy;
begin
        inherited Destroy;
end;

function Get: TPT;
begin
        result := @Data.Data;
end;

begin
end.
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