Re: [Lazarus] array[0..n] of class of TSomething
On Wed, Jul 13, 2011 at 6:36 AM, Hans-Peter Diettrich drdiettri...@aol.com wrote: Flávio Etrusco schrieb: Err, why pollute the namespace with an identifier you'll only refer once? For clarity? Code is not only written for the compiler, but also for human readers. Look at the C syntax for type declarations, where some constructs are nearly unparsable by humans (without pen and paper). The name also may be useful in debugging and RTTI, and with every usage of an array element in code. Pascal is a strongly typed language, where e.g. for local variables or parameter types a unique type name is a must! DoDi I agree with on your principles - and your observation on C syntax ;-) - but disagree this specific case goes against these principles. Best regards, Flávio -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] array[0..n] of class of TSomething
Hans-Peter Diettrich wrote: Flávio Etrusco schrieb: Err, why pollute the namespace with an identifier you'll only refer once? For clarity? Code is not only written for the compiler, but also for human readers. As are comments. Particularly for a rarely-used construct like 'class of' I think it's reasonable to split it out and say why it's there. (* An element is either a scalar or a column in a (row in a) table, and is *) (* directly associated with the action of getting or setting a value via SNMP. *) typeCNodeContent= class of TNodeContent; TNodeContentArray= array of CNodeContent; CNode= class of TNode; TNodeArray= array of CNode; TNodeContent= class(TObject) public Also (as shown above) there's the potential for forward references, in which case I suggest it's good practice to be consistent. -- Mark Morgan Lloyd markMLl .AT. telemetry.co .DOT. uk [Opinions above are the author's, not those of his employers or colleagues] -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] array[0..n] of class of TSomething
Seems like codetools parser bug. Try writing it type by type: type Tp2pMessageClass = class of Tp2pMessage; Tp2pMessageClassArray = array [0 .. 1] of Tp2pMessageClass; const MsgTypes: Tp2pMessageClassArray = ( ... ); -- View this message in context: http://free-pascal-lazarus.989080.n3.nabble.com/Lazarus-array-0-n-of-class-of-TSomething-tp3162813p3163033.html Sent from the Free Pascal - Lazarus mailing list archive at Nabble.com. -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] array[0..n] of class of TSomething
On 12.07.2011 18:38, leledumbo wrote: Seems like codetools parser bug. Try writing it type by type: type Tp2pMessageClass = class of Tp2pMessage; Tp2pMessageClassArray = array [0 .. 1] of Tp2pMessageClass; const MsgTypes: Tp2pMessageClassArray = ( ... ); Free Pascal supports class of in declarations while Delphi does not, but it's a seldom used feature so the developers of the code tools might not have noticed that problem at all :) @Bernd: Would you create a bug report, please? Regards, Sven -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] array[0..n] of class of TSomething
Sven Barth schrieb: On 12.07.2011 18:38, leledumbo wrote: Seems like codetools parser bug. Try writing it type by type: type Tp2pMessageClass = class of Tp2pMessage; Tp2pMessageClassArray = array [0 .. 1] of Tp2pMessageClass; const MsgTypes: Tp2pMessageClassArray = ( ... ); Free Pascal supports class of in declarations while Delphi does not, but it's a seldom used feature so the developers of the code tools might not have noticed that problem at all :) IMO this comfort is a misfeature, that bloats the compiler and all other parsers. It has not been introduced in Delphi for good reason. DoDi -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] array[0..n] of class of TSomething
On Tue, Jul 12, 2011 at 7:53 PM, Hans-Peter Diettrich drdiettri...@aol.com wrote: Sven Barth schrieb: On 12.07.2011 18:38, leledumbo wrote: Seems like codetools parser bug. Try writing it type by type: type Tp2pMessageClass = class of Tp2pMessage; Tp2pMessageClassArray = array [0 .. 1] of Tp2pMessageClass; const MsgTypes: Tp2pMessageClassArray = ( ... ); Free Pascal supports class of in declarations while Delphi does not, but it's a seldom used feature so the developers of the code tools might not have noticed that problem at all :) IMO this comfort is a misfeature, that bloats the compiler and all other parsers. It has not been introduced in Delphi for good reason. DoDi Err, why pollute the namespace with an identifier you'll only refer once? It's hardly essential but surely not a misfeature either. -Flávio -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
