Re: [Lazarus] record literal in FPC?
On 01/09/2013 07:48 PM, Hans-Peter Diettrich wrote: A with should evaluate to an address IMHO this is an implementation detail, that any compiler can handle as it likes to. It also could just work as if in the source the appropriate record elements code are prefixed by the with argument. That does not prevent that during compilation as well a code using with as a fully expanded code can be optimized to use a pointer to the record. (I in fact never use with as with Delphi 7 - which I last tested on that behalf - the debugger does not easily show record elements that are defined in a with clause. Moreover more often than not the code with (nested) with can get rather ambiguous and confusing.) -Michael -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] record literal in FPC?
Hi, you could also use the with-statement, that is pretty handy in such cases: |with Edit1.CaretPos do begin X := 0; Y := 0; end;| Best Regards, Andreas On 08.01.2013 16:30, xrfang wrote: Hi, Is there record literal in FPC? e.g. normally, you do: var cp : TPoint; cp.X := 0; cp.Y := 0; Edit1.CaretPos := cp; I would like to use literal directly, such as: Edit1.CaretPos := (X: 0, Y: 0); But the above syntax is wrong. Is there such thing exists? Thanks, Shannon -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] record literal in FPC?
As far as I know pascal inline directive only affect the compiler, not how you write code. Could you please give an example how inline function helps in my question? Yes it does, what I mean is to create something that Point() function does and using inline directive it's nearly the same as assigning record via literal. Well, if you know how it's done by other compilers, record literal assignment is actually broken down into field by field assignment. So if you make a function that returns the record with given arguments as record fields, with inline directive the final code would be the same. Well... maybe you'll need some other directives as well, but it's just my thought. I never really compare the generated code... -- View this message in context: http://free-pascal-lazarus.989080.n3.nabble.com/Lazarus-record-literal-in-FPC-tp4028464p4028478.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] record literal in FPC?
Well, my purpose is to make the source code look comfortable, not how the binary code is generated :) Well, again, I got a good idea from Andreas. Thanks to all of you. 在 三, 1月 9, 2013 at 7:45 下午，leledumbo leledumbo_c...@yahoo.co.id 写道： As far as I know pascal inline directive only affect the compiler, not how you write code. Could you please give an example how inline function helps in my question? Yes it does, what I mean is to create something that Point() function does and using inline directive it's nearly the same as assigning record via literal. Well, if you know how it's done by other compilers, record literal assignment is actually broken down into field by field assignment. So if you make a function that returns the record with given arguments as record fields, with inline directive the final code would be the same. Well... maybe you'll need some other directives as well, but it's just my thought. I never really compare the generated code... -- View this message in context: http://free-pascal-lazarus.989080.n3.nabble.com/Lazarus-record-literal-in-FPC-tp4028464p4028478.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 -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] record literal in FPC?
Hi Adreas, I just tried, your method did not work as expected. It compiled ok, but didn't put the cursor at the end of the line as I wanted. However, assign CaretPos a new TPoint worked. Regards, 在 三, 1月 9, 2013 at 4:47 下午，Andreas Schneider ak...@gmx.de 写道： Hi, you could also use the with-statement, that is pretty handy in such cases: with Edit1.CaretPos do begin X := 0; Y := 0; end; Best Regards, Andreas On 08.01.2013 16:30, xrfang wrote: Hi, Is there record literal in FPC? e.g. normally, you do: var cp : TPoint; cp.X := 0; cp.Y := 0; Edit1.CaretPos := cp; I would like to use literal directly, such as: Edit1.CaretPos := (X: 0, Y: 0); But the above syntax is wrong. Is there such thing exists? Thanks, Shannon -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] record literal in FPC?
On Wed, 09 Jan 2013 12:27:33 +0008 xrfang xrf...@gmail.com wrote: Hi Adreas, I just tried, your method did not work as expected. It compiled ok, but didn't put the cursor at the end of the line as I wanted. However, assign CaretPos a new TPoint worked. Regards, 在 三, 1月 9, 2013 at 4:47 下午，Andreas Schneider ak...@gmx.de 写道： Hi, you could also use the with-statement, that is pretty handy in such cases: with Edit1.CaretPos do begin X := 0; Y := 0; end; With does not work with record properties. Mattias -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] record literal in FPC?
Interesting. IIRC that worked correctly in Delphi 2010 (it's been a while ...). This /might /be a bug in FPC. The root of the problem is how properties are handled. Afaics however, the use of /with/ should cause it to assign the final record afterwards. Apparently it doesn't - at least not always. Could be by design, could be a bug. I'll check the bug tracker later and may report that. (You can do that yourself, if you want, but sooner or later I would like that functionality to work too, so I've a personal interest in this and therefore would not mind to report it :-)) Greetings, Andreas On 09.01.2013 13:19, xrfang wrote: Hi Adreas, I just tried, your method did not work as expected. It compiled ok, but didn't put the cursor at the end of the line as I wanted. However, assign CaretPos a new TPoint worked. Regards, ? ?, 1? 9, 2013 at 4:47 ??,Andreas Schneider ak...@gmx.de ??: Hi, you could also use the with-statement, that is pretty handy in such cases: |with Edit1.CaretPos do begin X := 0; Y := 0; end;| Best Regards, Andreas On 08.01.2013 16:30, xrfang wrote: Hi, Is there record literal in FPC? e.g. normally, you do: var cp : TPoint; cp.X := 0; cp.Y := 0; Edit1.CaretPos := cp; I would like to use literal directly, such as: Edit1.CaretPos := (X: 0, Y: 0); But the above syntax is wrong. Is there such thing exists? Thanks, Shannon -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] record literal in FPC?
I don't know if it's related to the fact that TEdit.CaretPos.X (or Y) is read only, or as Mattias said, the with syntax cannot work with record anyway... :-) This should be a problem (if any) with lazarus not fpc. Shannon 在 三, 1月 9, 2013 at 8:27 下午，Andreas Schneider ak...@gmx.de 写道： Interesting. IIRC that worked correctly in Delphi 2010 (it's been a while ...). This might be a bug in FPC. The root of the problem is how properties are handled. Afaics however, the use of with should cause it to assign the final record afterwards. Apparently it doesn't - at least not always. Could be by design, could be a bug. I'll check the bug tracker later and may report that. (You can do that yourself, if you want, but sooner or later I would like that functionality to work too, so I've a personal interest in this and therefore would not mind to report it :-)) Greetings, Andreas On 09.01.2013 13:19, xrfang wrote: Hi Adreas, I just tried, your method did not work as expected. It compiled ok, but didn't put the cursor at the end of the line as I wanted. However, assign CaretPos a new TPoint worked. Regards, 在 三, 1月 9, 2013 at 4:47 下午，Andreas Schneider ak...@gmx.de 写道： Hi, you could also use the with-statement, that is pretty handy in such cases: with Edit1.CaretPos do begin X := 0; Y := 0; end; Best Regards, Andreas On 08.01.2013 16:30, xrfang wrote: Hi, Is there record literal in FPC? e.g. normally, you do: var cp : TPoint; cp.X := 0; cp.Y := 0; Edit1.CaretPos := cp; I would like to use literal directly, such as: Edit1.CaretPos := (X: 0, Y: 0); But the above syntax is wrong. Is there such thing exists? Thanks, Shannon -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] record literal in FPC?
On Wed, 09 Jan 2013 13:27:50 +0100 Andreas Schneider ak...@gmx.de wrote: Interesting. IIRC that worked correctly in Delphi 2010 (it's been a while ...). This /might /be a bug in FPC. The root of the problem is how properties are handled. Afaics however, the use of /with/ should cause it to assign the final record afterwards. That would be nice. At the moment fpc does not do that. Apparently it doesn't - at least not always. Could be by design, could be a bug. I'll check the bug tracker later and may report that. (You can do that yourself, if you want, but sooner or later I would like that functionality to work too, so I've a personal interest in this and therefore would not mind to report it :-)) Feel free to submit a feature request to the fpc bug tracker. Mattias -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] record literal in FPC?
09.01.13, 20:34, Mattias Gaertner пишет: Apparently it doesn't - at least not always. Could be by design, could be a bug. I'll check the bug tracker later and may report that. (You can do that yourself, if you want, but sooner or later I would like that functionality to work too, so I've a personal interest in this and therefore would not mind to report it :-)) Feel free to submit a feature request to the fpc bug tracker. First check whether it works delphi mode. Best regards, Paul Ishenin -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] record literal in FPC?
On Wednesday, January 9, 2013, 01:40pm Paul Ishenin wrote: First check whether it works delphi mode. Apparently, it even works in mode objfpc. But only when the property directly reads/writes a member. If there is a setter method, it will still compile but NOT actually change the record. Neither in mode objfpc nor in mode delphi. Example attached. I will also open a bug report. -- Best Regards, Andreas fpcwith.lpr Description: Binary data -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] record literal in FPC?
xrfang schrieb: I don't know if it's related to the fact that TEdit.CaretPos.X (or Y) is read only, or as Mattias said, the with syntax cannot work with record anyway... :-) A with should evaluate to an address, but a Delphi compatible *property* doesn't have an address. DoDi -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
[Lazarus] record literal in FPC?
Hi, Is there record literal in FPC? e.g. normally, you do: var cp : TPoint; cp.X := 0; cp.Y := 0; Edit1.CaretPos := cp; I would like to use literal directly, such as: Edit1.CaretPos := (X: 0, Y: 0); But the above syntax is wrong. Is there such thing exists? Thanks, Shannon-- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] record literal in FPC?
On Tue, Jan 8, 2013 at 5:30 PM, xrfang xrf...@gmail.com wrote: Hi, Is there record literal in FPC? e.g. normally, you do: var cp : TPoint; cp.X := 0; cp.Y := 0; Edit1.CaretPos := cp; I would like to use literal directly, such as: Edit1.CaretPos := (X: 0, Y: 0); But the above syntax is wrong. Is there such thing exists? no, but try the point function Thanks, Shannon -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] record literal in FPC?
On 08/1/13 3:30, xrfang wrote: I would like to use literal directly, such as: Edit1.CaretPos := (X: 0, Y: 0); You can use a typed constant thus: const Origin: TPoint = (x:0; y:0); begin ... Edit1.CaretPos := Origin; ... -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] record literal in FPC?
Thanks, but what I want is to AVOID any kind of declarations. So I will use the Point() function suggested by ik. 在 三, 1月 9, 2013 at 12:26 上午，Howard Page-Clark h...@talktalk.net 写道： On 08/1/13 3:30, xrfang wrote: I would like to use literal directly, such as: Edit1.CaretPos := (X: 0, Y: 0); You can use a typed constant thus: const Origin: TPoint = (x:0; y:0); begin .. Edit1.CaretPos := Origin; .. -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] record literal in FPC?
If you declare an inline function producing the record, the effect would be the same with that literal record. -- View this message in context: http://free-pascal-lazarus.989080.n3.nabble.com/Lazarus-record-literal-in-FPC-tp4028464p4028474.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] record literal in FPC?
Hi leledumbo, As far as I know pascal inline directive only affect the compiler, not how you write code. Could you please give an example how inline function helps in my question? Thanks 2013/1/9 leledumbo leledumbo_c...@yahoo.co.id If you declare an inline function producing the record, the effect would be the same with that literal record. -- View this message in context: http://free-pascal-lazarus.989080.n3.nabble.com/Lazarus-record-literal-in-FPC-tp4028464p4028474.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 -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
