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https://github.com/Z3Prover/z3
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48 lines
1.4 KiB
C++
48 lines
1.4 KiB
C++
/*++
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Copyright (c) 2017 Microsoft Corporation
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Module Name:
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<name>
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Abstract:
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<abstract>
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Author:
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Lev Nachmanson (levnach)
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Revision History:
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--*/
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#pragma once
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#include "util/vector.h"
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#include <unordered_set>
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namespace lp {
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class lar_solver; // forward definition
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class quick_xplain {
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std::unordered_set<unsigned> m_x; // the minimal set of constraints, the core - it is empty at the begining
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vector<lar_constraint> m_constraints_in_local_vars;
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vector<std::pair<mpq, constraint_index>> & m_explanation;
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const lar_solver& m_parent_solver;
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lar_solver & m_qsol;
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vector<constraint_index> m_local_constraint_offset_to_external_ci;
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std::unordered_map<constraint_index, unsigned> m_local_ci_to_constraint_offsets;
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quick_xplain(vector<std::pair<mpq, constraint_index>> & explanation, const lar_solver & parent_lar_solver, lar_solver & qsol);
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void minimize(const vector<unsigned> & u);
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void add_constraint_to_qsol(unsigned j);
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void copy_constraint_and_add_constraint_vars(const lar_constraint& lar_c);
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void copy_constraints_to_local_constraints();
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bool infeasible();
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bool is_feasible(const vector<unsigned> & x, unsigned k) const;
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bool x_is_minimal() const;
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public:
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static void run(vector<std::pair<mpq, constraint_index>> & explanation,const lar_solver & ls);
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void solve();
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};
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}
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