Originally posted by: bendinio

Hi!

I'm about to implement an algorithm using ILOBRANCHCALLBACK with passing
NodeData through the search-tree. I defined my NodeData class as follows:

class passNext : public IloCplex::MIPCallbackI::NodeData {
public:
IloInt level;
IloIntArray sel_vars;
IloIntArray sel_vals;

passNext();

passNext(IloInt lvl, IloIntArray vars, IloIntArray vals) {
level = lvl + 1;
sel_vars = vars;
sel_vals = vals;}

passNext(IloInt lvl, IloInt var, IloInt val) {
level = lvl + 1;
sel_vars.add(var);
sel_vals.add(val);}

~passNext(){}; };

I'm compiling under Microsoft Visual Studio 2008 (C++) and there occurs no
error while compiling, though the execution fails on creating an object
of passNext. Visual Studio redirects me to the osfinfo.c file.

I did a lot of searching for real examples of NodeData being used to pass
information to subnodes, but i can't find anything. So I would be glad if
somebody could at least give his opinion or maybe the solution.

Thanks for reading.

bendinio
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Originally posted by: bendinio

just figured it out, forgot the IloEnv.
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Originally posted by: bendinio

i'm sorry, there still remains a problem.

i want to access the data passed in NodeData, this seems not so simply as you think.
Here's the code:
NodeData *nd = getNodeData();
if( nd != 0 ) {
passNext *node_data = dynamic_cast<passNext*> (nd);
}

It doesn't work since the cast is not welldefined. But are there any alternatives?

Thanks in advance!
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Originally posted by: SystemAdmin

As far as I can see that is exactly what I would do.
What is the exact problem you are facing? Does your code compile? If not, what is the error message? Does your code crash at run-time? If so, were does it crash?
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Originally posted by: SystemAdmin

I have a similar problem: when compiling the code (written in Concert) with Visual Studio 2008, I get this compilation error:

"error C2352: 'IloCplex::ControlCallbackI::getNodeData' : illegal call of non-static member function C:\ILOG\CPLEX121\include\ilcplex/ilocplexi.h(2015) : see declaration of 'IloCplex::ControlCallbackI::getNodeData'"
My piece of code is

NodeData *nd = IloCplex::ControlCallbackI::getNodeData();
if( nd != 0 ) nodenumber *node_data = dynamic_cast<nodenumber*> (nd);

and the nodenumber structure has been defined as follows:

struct nodenumber : public IloCplex::MIPCallbackI::NodeData
{
IloInt nn;

nodenumber() {nn=-1;}
nodenumber(IloInt a) {nn=a;}
};
What should I do to correctly get the NodeData information I have already stored? Thanks.

Sergio.
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Originally posted by: SystemAdmin

You can invoke getNodeData() only from callback member functions (it is a non-static member function as correctly indicated by your compiler).
So, for example in the main() function of your callback you can do:

void MyCallback::main() {
   nodenumber *node_data = dynamic_cast<nodenumber *>(getNodeData());
}

This will return the node data for the node at which the callback is currently being invoked.
Did you try to invoke getNodeData() from a non-member or a static member function?
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Originally posted by: SystemAdmin

After trying your suggestion, I've realized that I was using a MIPCallback instead of a CutCallback. Now it works. Thanks.

Sergio.
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