Ralf A. Quint wrote:
At 11:52 AM 10/23/2011, Frank Peelo wrote:
If I recall corerctly, that Modula-2 value for nil was the address the
8086 jumped to when released from RESET. So jumping through a pointer
with value nil would be something you would notice pretty much
immediately.
Certainly
On 22/10/11 10:01, Mark Morgan Lloyd wrote:
Felipe Monteiro de Carvalho wrote:
Free is how you release the memory allocated for a object. Free calls
Destroy. Never call Destroy manually. When you implement the
destructor you always implement Destroy, never change Free.
A number of years ago,
At 11:52 AM 10/23/2011, Frank Peelo wrote:
If I recall corerctly, that Modula-2 value for nil was the address
the 8086 jumped to when released from RESET. So jumping through a
pointer with value nil would be something you would notice pretty
much immediately.
Certainly not. Modula-2 was/is
I understand Assigned as being the same as nil, so Assigned(Object)
= Object nil
I vaguely remember that it could be safer in some corner case, but I
don't remember ever meting that.
Free is how you release the memory allocated for a object. Free calls
Destroy. Never call Destroy manually.
22.10.2011 10:20, Felipe Monteiro de Carvalho пишет:
I understand Assigned as being the same as nil, so Assigned(Object)
= Object nil
I vaguely remember that it could be safer in some corner case, but I
don't remember ever meting that.
Method pointers?
On 22 October 2011 07:20, Felipe Monteiro de Carvalho
felipemonteiro.carva...@gmail.com wrote:
I understand Assigned as being the same as nil, so Assigned(Object)
= Object nil
I vaguely remember that it could be safer in some corner case, but I
don't remember ever meting that.
Free is
Nil is not a routine, it is a value, it means that the object
is empty, it does not exist / is not allocated. Nil in
existing implementations that I know is represented by the value zero.
The typical life-cycle of a object is:
MyObject := TMyObject.Create;
try
When the loop runs again Assigned in InitVars is false so as soon as those
FBreakStrings and SCStrings are accessed within the loop a SIGSEGV occurs.
So what I want to know is whether Assigned remains true when Free is
executed.
See my previous answer.
There is a helper function
On 22 October 2011 08:14, Ludo Brands ludo.bra...@free.fr wrote:
Nil is not a routine, it is a value, it means that the object
is empty, it does not exist / is not allocated. Nil in
existing implementations that I know is represented by the value zero.
The typical life-cycle of a object
this helps,
Thierry
- Mail Original -
De: Frank Church vfcli...@gmail.com
À: FPC-Pascal users discussions fpc-pascal@lists.freepascal.org
Envoyé: Samedi 22 Octobre 2011 09h08:17 GMT +01:00 Amsterdam / Berlin / Berne /
Rome / Stockholm / Vienne
Objet: Re: [fpc-pascal] How are Assigned, Free
Does that mean that Free itself reclaims the memory used by the object's
fields and properties but does not release the memory used by the TObject or
pointer itself, where as setting it to nil or executing Destroy does, or
does Destroy do something different?
All memory is released
On Sat, Oct 22, 2011 at 9:36 AM, Frank Church vfcli...@gmail.com wrote:
Does that mean that Free itself reclaims the memory used by the object's
fields and properties but does not release the memory used by the TObject or
pointer itself, where as setting it to nil or executing Destroy does, or
Felipe Monteiro de Carvalho wrote:
Free is how you release the memory allocated for a object. Free calls
Destroy. Never call Destroy manually. When you implement the
destructor you always implement Destroy, never change Free.
A number of years ago, Matthew Jones's wife looked over his
In our previous episode, Felipe Monteiro de Carvalho said:
Nil is not a routine, it is a value, it means that the object is
empty, it does not exist / is not allocated. Nil in existing
implementations that I know is represented by the value zero.
Look better in, euh, Free Pascal, and see what
This is one question I have wanted to ask for a long time.
How are Assigned, Free, Nil and Destroy related, and when is one or another
appropriate? What other procedure have I missed?
There are so many articles and mailing list threads on this issue that I
don't think asking it makes me sound
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