I'm playing with lists as an alternative to arrays and have come across a problem:

module people;
private import std.stdio;
private import list;

class Person
{
mixin List; // Turn the Person class into a linked list.

char[] name,tname;
ubyte age;

this(char[] name, ubyte age){this.name = name;this.age = age;}
}

int main()
{
Person.ListHead people,others;

foreach(Person p; people.each)
{
writefln("Person %s is %d years old", p.name, p.age);
}

writefln("---");

foreach(Person p; others.each.backwards)
{
writefln("Person %s is %d years old", p.name, p.age);
}

return 0;
}


produces:

C:\list21>testing6
---
Error: Access Violation

C:\list21>

So iterating over a list is OK provided you don't try to reverse it. I'm guessing this is an error in the library but not sure how to fix it.  Anyone got an idea?

Simon

On Tue, 20 Jun 2006 12:36:20 -0400, <simon.hodson@hssnet.com> wrote:
> So iterating over a list is OK provided you don't try to reverse it. I'm
> guessing this is an error in the library but not sure how to fix it.  Anyone got
> an idea?
>
> Simon

A fixed version is uploaded to http://www.dprogramming.com/list.php - thanks for letting me know about this. It was only an issue in a contract (debug only).

Thanks Chris,

I've found another similar assert issue where a filter is applied against an empty list and then the list be sorted backwards: -

module people;
private import std.stdio;
private import list;

class Person
{
mixin List; // Turn the Person class into a linked list.

char[] name,tname;
ubyte age;

this(char[] name, ubyte age){this.name = name;this.age = age;}
}

int main()
{
Person.ListHead people,others;

writefln("-start filter-");
others.filter(
delegate bool(Person f)
{
if(f.name is null)
{
others.remove(f);
}
return true;
}
);
writefln("-end filter-");

foreach(Person p; others.each.backwards)
{
writefln("Person %s is %d years old", p.name, p.age);
}
return 0;
}

produces: -

C:\list21>testing6
-start filter-
Error: AssertError Failure list.d(648)


Regards

Simon


In article <op.tbhrcyuppo9bzi@moe>, Chris Miller says...
>
>On Tue, 20 Jun 2006 12:36:20 -0400, <simon.hodson@hssnet.com> wrote:
>> So iterating over a list is OK provided you don't try to reverse it. I'm
>> guessing this is an error in the library but not sure how to fix it.
>> Anyone got
>> an idea?
>>
>> Simon
>
>A fixed version is uploaded to http://www.dprogramming.com/list.php - thanks for letting me know about this. It was only an issue in a contract (debug only).

On Wed, 21 Jun 2006 10:49:29 -0400, <simon.hodson@hssnet.com> wrote:
> I've found another similar assert issue where a filter is applied against an
> empty list and then the list be sorted backwards: -

Thanks, updated.