[gecode-users] Using AFC in Gecode 4
kisshen at cisco.com
Tue Jul 9 19:08:57 CEST 2013
Thanks for your help!
On 09/07/2013 14:59, Christian Schulte wrote:
> The afc() member function now requires a space argument, see:
Thanks. I have added this, and it now compiles.
This probably reflects my unfamiliarity with C++, but I did look at the
reference documentation for IntVar, and found that afc() was not there,
as it is in VarImpVar<int:IntVarImp>, and I didn't know I should look
somewhere other than the IntVar section.
> Before using afc, you have to call
> for some decay value to enable support for afc (if not doing that, things
> will go kaboom). This method also changes the afc-decay for all variables.
I assume this only has to be done with the first space I create, and not
any subsequent clones of the space?
I tried adding the afc_decay(1U) call just after the first time a space
is created. The space I use is of class GecodeSpace, and I get an error
void Gecode::Space::afc_decay(double) is private within this context
the code I have is essentially:
solver = new GecodeSpace();
Do I need to do something in the definition of GecodeSpace to make
afc_decay() public? (I guess this is again my unfamiliarity with C++)
Finally, as I mentioned in my previous message, I got the impression
from reading the MPG (section 8.5.2, Selection using accumulated failure
count), that you need to create a IntAFC object on an integer variable
array in order to use AFC. Did I miss something in this section, or
should the above usage of AFC be mentioned in the section?
Thanks and cheers,
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