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https://github.com/Z3Prover/z3
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77 lines
2.1 KiB
C++
77 lines
2.1 KiB
C++
/*++
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Copyright (c) 2017 Microsoft Corporation
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Abstract:
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justifications for upper or lower bounds
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Author:
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Lev Nachmanson (levnach)
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--*/
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#pragma once
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#include "util/vector.h"
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#include "util/dependency.h"
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#include <string>
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#include <algorithm>
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#include <utility>
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#include "math/lp/column_info.h"
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#include "math/lp/lp_types.h"
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namespace lp {
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inline bool kind_is_strict(lconstraint_kind kind) { return kind == LT || kind == GT;}
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inline std::ostream& operator<<(std::ostream& out, lconstraint_kind k) {
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switch (k) {
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case LE: return out << "<=";
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case LT: return out << "<";
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case GE: return out << ">=";
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case GT: return out << ">";
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case EQ: return out << "=";
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case NE: return out << "!=";
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}
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return out << "??";
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}
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inline bool compare(const std::pair<mpq, var_index> & a, const std::pair<mpq, var_index> & b) {
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return a.second < b.second;
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}
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class ul_pair {
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u_dependency* m_lower_bound_witness = nullptr;
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u_dependency* m_upper_bound_witness = nullptr;
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bool m_associated_with_row = false;
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public:
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// TODO - seems more straight-forward to just expose ul_pair as a struct with direct access to attributes.
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u_dependency*& lower_bound_witness() { return m_lower_bound_witness; }
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u_dependency* lower_bound_witness() const { return m_lower_bound_witness; }
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u_dependency*& upper_bound_witness() { return m_upper_bound_witness; }
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u_dependency* upper_bound_witness() const { return m_upper_bound_witness; }
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// equality is used by stackedvector operations.
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// this appears to be a low level reason
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bool operator!=(const ul_pair & p) const {
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return !(*this == p);
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}
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bool operator==(const ul_pair & p) const {
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return m_lower_bound_witness == p.m_lower_bound_witness
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&& m_upper_bound_witness == p.m_upper_bound_witness
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&& m_associated_with_row == p.m_associated_with_row;
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}
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// empty constructor
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ul_pair() {}
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ul_pair(bool associated_with_row) :
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m_associated_with_row(associated_with_row) {}
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bool associated_with_row() const { return m_associated_with_row; }
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};
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}
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