Hi,
I just tried to use the ppl to work with integer polyhedron, however I
am stuck with the examples in the documentation for the
Partial_Reduced_Product:
http://www.cs.unipr.it/ppl/Documentation/user/ppl-user-0.10.2-html/classPar…
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In all the examples it is assumed that the template R is the
No_Reduction<D1, D2> class and that variables x and y are defined (where
they are used) as follows:
Variable x(0);
Variable y(1);
Example 1
The following code builds a direct product of a Grid and NNC
Polyhedron, corresponding to the positive even integer pairs in
R^2, given as a system of congruences:
Congruence_System cgs;
cgs.insert((x %= 0) / 2);
cgs.insert((y %= 0) / 2);
Partially_Reduced_Product<Grid, NNC_Polyhedron, No_Reduction<D1, D2> >
dp(cgs);
dp.add_constraint(x >= 0);
dp.add_constraint(y >= 0);
Example 2
The following code builds the same product in R^2:
Partially_Reduced_Product<Grid, NNC_Polyhedron, No_Reduction<D1, D2> > dp(2);
dp.add_constraint(x >= 0);
dp.add_constraint(y >= 0);
dp.add_congruence((x %= 0) / 2);
dp.add_congruence((y %= 0) / 2);
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I would like to create the set of even positive integer pairs, so I
tried Example 1 and 2. With both I have the same problems.
1. D1 and D2 are not defined:
test.cpp:9: error: 'D1' was not declared in this scope
test.cpp:9: error: 'D2' was not declared in this scope
So I replace D1 with "Grid" and D2 with "NNC_Polyhedron"
2. An exception when adding constrains:
terminate called after throwing an instance of 'std::invalid_argument'
what(): PPL::Grid::add_constraint(c):
c is not an equality constraint.
So I removed the positive constraints.
3. An exception when adding congruences:
terminate called after throwing an instance of 'std::invalid_argument'
what(): PPL::NNC_Polyhedron::add_congruence(cg):
cg is a non-trivial, proper congruence.
Do you have any idea what I did wrong?
Tobias
