void dependencies(Gecode::Space& home, MPG::CPRelVar installation, MPG::CPRelVar dependencies) {
if (home.failed()) return;
MPG::CPRel::CPRelView inst(installation);
MPG::CPRel::CPRelView deps(dependencies);
GECODE_ES_FAIL((Dependencies::post(home,inst,deps)));
}
void exclude(Gecode::Space& home, CPRelVar A, GRelation r) {
if (home.failed()) return;
if (r.arity() != A.arity())
throw ArityMissmatch("Exclude constraint");
CPRelView a(A);
auto me = a.exclude(home,r);
if (me == Gecode::ES_FAILED) {
home.fail();
}
}
void projection(Gecode::Space& home, int p, CPRelVar A, CPRelVar B) {
if (home.failed()) return;
typedef boost::error_info<struct tag_proj_descriptor,std::string>
proj_descriptor;
if (p > A.arity())
throw InvalidProjection()
<< errno_code(errno)
<< proj_descriptor("Invalid projection description when posting projection constraint: p has to be valid for A");
CPRelView left(A);
CPRelView right(B);
GECODE_ES_FAIL((Project<CPRelView,CPRelView>::post(home,p,left,right)));
}