Dear Alfredo,
I think the problem lies in the initialization of the BoolVarArray.
Even for BoolVars, you have to give an initial domain, so you should
change the code to
m_vars = BoolVarArray(*this,900, 0,1);
The way you wrote it, you just allocated an array of size 900 with
uninitialized variables, that's probably why it crashed.
Hope this helps,
Guido
Alfredo Esteban wrote:
> Hello,
>
> I'm getting started with Gecode reading "Modeling with Gecode". I
> have experience in Constraint Programming using iLog software.
>
> I installed Gecode and I created a project to test it. I used
> SendMoreMoney example. Everything is ok and I can compile and
> execute this example.
>
> However, when I tried to build my own simple model, compilation is
> ok but I get a segmentation fault when posting a linear constraint.
> It is very strange because I imitated SendMoreMoney example. I
> searched in mailing list but I didn't find anything.
>
> I show you the code. In main.cpp we have:
>
> int main(int argc, char* argv[]) {
> SchoolTimeTable* problem = new SchoolTimeTable();
> [...]
> return 0;
> }
>
> In schoolTimeTable.h we have:
>
> #include <gecode/int.hh>
>
> using namespace Gecode;
>
> class SchoolTimeTable : public Space {
> protected:
> BoolVarArray m_vars;
> public:
> SchoolTimeTable(void);
> SchoolTimeTable(bool share, SchoolTimeTable& s);
> virtual Space* copy(bool share);
> void print(void) const;
> };
>
> In schoolTimeTable.cpp we have:
>
> #include "schoolTimeTable.h"
> #include <gecode/search.hh>
>
> SchoolTimeTable::SchoolTimeTable(void){
> m_vars = BoolVarArray(*this,900);
>
> BoolVarArgs borrame(3);
> for (int i=0; i<3; i++) borrame[i]=m_vars[i];
> linear(*this,borrame,IRT_EQ,2); // SIGSEGV IS HERE
> }
>
> SchoolTimeTable::SchoolTimeTable(bool share, SchoolTimeTable& s)
> : Space(share, s) {
> m_vars.update(*this, share, s.m_vars);
> }
>
> Space* SchoolTimeTable::copy(bool share) {
> return new SchoolTimeTable(share,*this);
> }
>
> Technical data:
>
> OS: Debian GNU/Linux Squeeze
> Gecode version: 3.1.0
> gcc version: 4.3.3
> gdb version: 6.8
>
> Thank you very much,
>
> Alfredo
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