mirrors/z3
3
0
Fork 0
mirror of https://github.com/Z3Prover/z3 synced 2025-06-27 08:28:44 +00:00
Code Activity

experimental feature to access congruence closure of SimpleSolver

Browse source 
This update includes an experimental feature to access a congruence closure data-structure after search.
It comes with several caveats as pre-processing is free to eliminate terms. It is therefore necessary to use a solver that does not eliminate the terms you want to track for congruence of. This is partially addressed by using SimpleSolver or incremental mode solving.

```python
from z3 import *
s = SimpleSolver()
x, y, z = Ints('x y z')
s.add(x == y)
s.add(y == z)
s.check()
print(s.root(x), s.root(y), s.root(z))
print(s.next(x), s.next(y), s.next(z))
```
This commit is contained in:
Nikolaj Bjorner 2022-12-30 21:41:27 -08:00
parent c0f1f33898
commit f6d411d54b
21 changed files with 145 additions and 12 deletions
Download patch file Download diff file Expand all files Collapse all files

20
src/api/api_solver.cpp
View file

@ -903,6 +903,26 @@ extern "C" {
Z3_CATCH_RETURN(nullptr);
}
Z3_ast Z3_API Z3_solver_congruence_root(Z3_context c, Z3_solver s, Z3_ast a) {
Z3_TRY;
LOG_Z3_solver_congruence_root(c, s, a);
RESET_ERROR_CODE();
init_solver(c, s);
expr* r = to_solver_ref(s)->congruence_root(to_expr(a));
RETURN_Z3(of_expr(r));
Z3_CATCH_RETURN(nullptr);
}
Z3_ast Z3_API Z3_solver_congruence_next(Z3_context c, Z3_solver s, Z3_ast a) {
Z3_TRY;
LOG_Z3_solver_congruence_next(c, s, a);
RESET_ERROR_CODE();
init_solver(c, s);
expr* sib = to_solver_ref(s)->congruence_next(to_expr(a));
RETURN_Z3(of_expr(sib));
Z3_CATCH_RETURN(nullptr);
}
class api_context_obj : public user_propagator::context_obj {
api::context* c;
public: