Am 2014-02-08 19:53, schrieb Florian Klämpfl:
> You didn't have only a question but you made also a proposal for a
> language change. And when proposing a change it is very usefull to have
> an example which demonstrates the reason for the change.
What code should I have written?
I was convinced
On 09.02.2014 03:48, leledumbo wrote:
http://wiki.freepascal.org/User_Changes_Trunk#Comparative_operators_can_have_any_result_type
Is this a preparation for LINQ-like functionality?
Delphi compatibility. But as the example shows you could use it for
LINQ-like functionality as well.
htt
On 2014-02-09 04:11, Jürgen Hestermann wrote:
Am 2014-02-08 19:53, schrieb Florian Klämpfl:
You didn't have only a question but you made also a proposal for a
language change. And when proposing a change it is very usefull to
have
an example which demonstrates the reason for the change.
[sni
Hello everybody.
Here next episode of the conversion of a useful fp unit into a universal
library...
After a hard battle, ... i win. But mainly because of the extremely high
quality of fpc. The compiler gives me useful tips to realise that unique
library.
Unique because that dynamic loaded
Hello everybody.
I have a question (maybe stupid) about dynamic arrays...
Usually, before to close the application, to avoid memory leak, i do :
if length(MyArray) > 0 then
for x := 0 to high(MyArray) do
MyArray[x].Free;
But, if i use :
setlength(MyArray, 0) ;
would it do the same job ?
Am 09.02.2014 13:05, schrieb Fred van Stappen:
> if length(MyArray) > 0 then
> for x := 0 to high(MyArray) do
> MyArray[x].Free;
>
> But, if i use :
>
> setlength(MyArray, 0) ;
>
> would it do the same job ?
No. Your array contains only references to the objects. The references
where del
> Date: Sun, 9 Feb 2014 13:08:16 +0100
> From: freepas...@ypa-software.de
> To: fpc-pascal@lists.freepascal.org
> Subject: Re: [fpc-pascal] High() and Low() for empty dynamic arrays
>
> Am 09.02.2014 13:05, schrieb Fred van Stappen:
> > if length(MyArray) > 0 then
> > for x := 0 to high(MyArray
There is another possible pitfall with dynamic arrays I trapped into which I
would like to share.
Those who handle dynamic arrays in a virtuoso manner daily may skip this
posting of course.
But I think for those who never used them before it may be of use.
Maybe it can be added to the Wiki (alth
Am 2014-02-09 15:10, schrieb Fred van Stappen:
> > if length(MyArray) > 0 then
> > for x := 0 to high(MyArray) do
> > MyArray[x].Free;
As I have learned just recently ;-) this code could be shortened by
for x := low(MyArray) to high(MyArray) do
MyArray[x].Free;
if x is a signed integer. S
> This won't have any negative impact on logical expressions
I expect that. I suppose the compiler has a mechanism for this such that "if
true then" would work.
--
View this message in context:
http://free-pascal-general.1045716.n5.nabble.com/Some-questions-regarding-language-changes-in-trunk-
On Sun, Feb 9, 2014 at 12:34 PM, Jürgen Hestermann
wrote:
> (...)
> With the following declaration and code:
>
> ---
> var A,B: array of integer;
> ...
> SetLength(A,10);
> B := A;
> SetLength(B,20);
> ---
>
> both variables A and B point to the same array with 20 E
On 09.02.2014 15:46, Jürgen Hestermann wrote:
Am 2014-02-09 15:10, schrieb Fred van Stappen:
> > if length(MyArray) > 0 then
> > for x := 0 to high(MyArray) do
> > MyArray[x].Free;
As I have learned just recently ;-) this code could be shortened by
for x := low(MyArray) to high(MyArray) d
On 09.02.2014 15:10, Fred van Stappen wrote:
> Date: Sun, 9 Feb 2014 13:08:16 +0100
> From: freepas...@ypa-software.de
> To: fpc-pascal@lists.freepascal.org
> Subject: Re: [fpc-pascal] High() and Low() for empty dynamic arrays
>
> Am 09.02.2014 13:05, schrieb Fred van Stappen:
> > if leng
On 09.02.2014 16:02, leledumbo wrote:
This won't have any negative impact on logical expressions
I expect that. I suppose the compiler has a mechanism for this such that "if
true then" would work.
I haven't explicitely checked it nor looked at the code (no time
currently), but it should eith
On 09.02.2014 15:34, Jürgen Hestermann wrote:
With the following declaration and code:
---
var A,B: array of integer;
...
SetLength(A,10);
B := A;
SetLength(B,20);
---
both variables A and B point to the same array with 20 Elements.
Changing A changes B and vice
On 09.02.2014 16:34, Flávio Etrusco wrote:
In other words: dynamic arrays are like AnsiStrings without the
copy-on-write semantics. I'd certainly wish Borland copied the COW
semantics :-/
Dynamic arrays have full COW semantics. If Jürgen would have provided a
full compilable example we could
Am 2014-02-09 16:34, schrieb Flávio Etrusco:
> In other words: dynamic arrays are like AnsiStrings without the
> copy-on-write semantics. I'd certainly wish Borland copied the COW
> semantics :-/
Yes. Therefore the issue that I described for dynamic arrays cannot occur for
ansistrings. But COW c
Am 2014-02-09 17:47, schrieb Sven Barth:
On 09.02.2014 16:34, Flávio Etrusco wrote:
In other words: dynamic arrays are like AnsiStrings without the
copy-on-write semantics. I'd certainly wish Borland copied the COW
semantics :-/
Dynamic arrays have full COW semantics.
Now I am fully confus
On 09/02/14 18:47, Sven Barth wrote:
On 09.02.2014 16:34, Flávio Etrusco wrote:
In other words: dynamic arrays are like AnsiStrings without the
copy-on-write semantics. I'd certainly wish Borland copied the COW
semantics :-/
Dynamic arrays have full COW semantics.
It seems not:
SetLength
Am 09.02.2014 18:41, schrieb Jürgen Hestermann:
> So it seems there is a copy-on-write *but* only when using SetLength.
No. There is no COW, only ref. counting. SetLength just forces an unique
instance of the array if needed.
> What a very consistent design!
There is a very good reason for this
On 09.02.2014 19:10, patspiper wrote:
On 09/02/14 18:47, Sven Barth wrote:
On 09.02.2014 16:34, Flávio Etrusco wrote:
In other words: dynamic arrays are like AnsiStrings without the
copy-on-write semantics. I'd certainly wish Borland copied the COW
semantics :-/
Dynamic arrays have full COW
> So: don't touch it! ;)
>
> Regards,
> Sven
Yep, many thanks for that clear answer.
;-)
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Hello list. I need to list all published properties declared in a class,
iow, removing properties inherited from the parent.
Up to now I am iterating typinfo.GetPropList, starting at:
GetTypeData(PTypeInfo(TheClass.ClassParent.ClassInfo))^.PropCount;
and it works (fpc 2.6.2). TheClass will n
You might have noticed that the FPC community site is already down for
some time. Since we are retiring the machine running the community site
we decided not to migrate the community but add some new boards to the
lazarus forum to reduce the need to maintain another bulletin board
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