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https://github.com/Z3Prover/z3
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introdure lar_term.ext_coeffs(), dio passes some tests
Signed-off-by: Lev Nachmanson <levnach@hotmail.com>
This commit is contained in:
Lev Nachmanson
Lev Nachmanson
parent
083926c658
commit
9a9ccf19c5
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@ -174,8 +174,6 @@ namespace lp {
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else if (val != numeric_traits<mpq>::one())
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out << T_to_string(val);
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out << "x";
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if (is_fresh_var(j))
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out << "~";
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out << j;
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}
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@ -374,7 +372,7 @@ namespace lp {
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void register_columns_to_term(const lar_term& t) {
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TRACE("dioph_eq", tout << "register term:"; lra.print_term(t, tout););
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for (const auto &p: t) {
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for (const auto &p: t.ext_coeffs()) {
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auto it = m_columns_to_terms.find(p.var());
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if (it != m_columns_to_terms.end()) {
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it->second.insert(t.j());
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@ -405,7 +403,7 @@ namespace lp {
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m_e_matrix.add_row();
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SASSERT(m_e_matrix.row_count() == m_entries.size());
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for (const auto& p : t) {
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for (const auto& p : t.ext_coeffs()) {
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SASSERT(p.coeff().is_int());
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if (is_fixed(p.var()))
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e.m_c += p.coeff() * lia.lower_bound(p.var()).x;
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@ -415,13 +413,6 @@ namespace lp {
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m_e_matrix.add_new_element(entry_index, lj, p.coeff());
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}
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}
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if (is_fixed(t.j())) {
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e.m_c -= lia.lower_bound(t.j()).x;
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} else {
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unsigned lj = add_var(t.j());
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m_e_matrix.add_columns_up_to(lj);
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m_e_matrix.add_new_element(entry_index, lj, -mpq(1));
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}
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SASSERT(entry_invariant(entry_index));
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}
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@ -866,7 +857,7 @@ namespace lp {
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print_lar_term_L(term_to_tighten, tout) << std::endl;
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tout << "m_tmp_l:"; print_lar_term_L(m_tmp_l, tout) << std::endl;
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tout << "open_ml:";
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print_term_o(open_ml(m_tmp_l), tout) << std::endl;
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print_lar_term_L(open_ml(m_tmp_l), tout) << std::endl;
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tout << "term_to_tighten + open_ml:";
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print_term_o(term_to_tighten + open_ml(m_tmp_l), tout)
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<< std::endl;
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@ -1307,7 +1298,7 @@ namespace lp {
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for (unsigned k = 0; k < lra.terms().size(); k ++ ) {
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const lar_term* t = lra.terms()[k];
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if (!all_vars_are_int(*t)) continue;
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for (const auto& p: *t) {
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for (const auto& p: (*t).ext_coeffs()) {
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unsigned j = p.var();
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auto it = c2t.find(j);
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if (it == c2t.end()) {
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@ -1317,7 +1308,8 @@ namespace lp {
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} else {
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it->second.insert(t->j());
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}
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}
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}
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for (const auto & p : c2t) {
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@ -1502,14 +1494,14 @@ namespace lp {
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{
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tout << "get_term_from_entry(" << ei << "):";
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print_term_o(get_term_from_entry(ei), tout) << std::endl;
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tout << "remove_fresh_vars:";
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tout << "ls:";
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print_term_o(remove_fresh_vars(get_term_from_entry(ei)), tout)
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<< std::endl;
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tout << "e.m_l:"; print_lar_term_L(l_term_from_row(ei), tout) << std::endl;
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tout << "open_ml(e.m_l):";
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print_term_o(open_ml(l_term_from_row(ei)), tout) << std::endl;
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tout << "fix_vars(open_ml(e.m_l)):";
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print_term_o(fix_vars(open_ml(l_term_from_row(ei))), tout) << std::endl;
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print_lar_term_L(open_ml(l_term_from_row(ei)), tout) << std::endl;
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tout << "rs:";
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print_term_o(fix_vars(open_ml(m_l_matrix.m_rows[ei])), tout) << std::endl;
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}
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);
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return ret;
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@ -1544,7 +1536,7 @@ namespace lp {
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std::ostream& print_ml(const lar_term& ml, std::ostream& out) {
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term_o opened_ml = open_ml(ml);
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return print_term_o(opened_ml, out);
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return print_lar_term_L(opened_ml, out);
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}
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template <typename T> term_o open_ml(const T& ml) const {
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@ -1564,7 +1556,7 @@ namespace lp {
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m_indexed_work_vector.clear();
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for (const auto & p: m_l_matrix.m_rows[ei]) {
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const lar_term& t = lra.get_term(p.var());
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for (const auto & q: t) {
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for (const auto & q: t.ext_coeffs()) {
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if (is_fixed(q.var())) {
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c += p.coeff()*q.coeff()*lia.lower_bound(q.var()).x;
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} else {
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@ -1572,13 +1564,6 @@ namespace lp {
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m_indexed_work_vector.add_value_at_index(q.var(), p.coeff() * q.coeff());
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}
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}
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if (is_fixed(t.j())) {
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c -= lia.lower_bound(t.j()).x;
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}
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else {
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make_space_in_work_vector(t.j());
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m_indexed_work_vector.add_value_at_index(t.j(), -p.coeff());
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}
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}
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}
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@ -30,6 +30,8 @@ protected:
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// the column index related to the term
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lpvar m_j = -1;
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public:
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// the column index related to the term
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lpvar j() const { return m_j; }
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void set_j(unsigned j) {
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@ -92,8 +94,6 @@ public:
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}
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// constructors
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lar_term() = default;
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<<<<<<< HEAD
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=======
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lar_term(lar_term&& other) noexcept = default;
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// copy assignment operator
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lar_term& operator=(const lar_term& other) = default;
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@ -106,7 +106,6 @@ public:
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}
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}
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>>>>>>> 956229fb6 (test that pivoting is correct in dioph_eq.cpp)
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lar_term(const vector<std::pair<mpq, unsigned>>& coeffs) {
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for (auto const& p : coeffs) {
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add_monomial(p.first, p.second);
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@ -257,10 +256,9 @@ public:
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m_coeffs.reset();
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}
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class ival {
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struct ival {
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lpvar m_var;
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const mpq & m_coeff;
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public:
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ival(lpvar var, const mpq & val) : m_var(var), m_coeff(val) { }
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lpvar j() const { return m_var; }
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lpvar var() const { return m_var; }
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@ -274,7 +272,12 @@ public:
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const_iterator operator++() { const_iterator i = *this; m_it++; return i; }
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const_iterator operator++(int) { m_it++; return *this; }
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const_iterator(u_map<mpq>::iterator it) : m_it(it) {}
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bool operator!=(const const_iterator &other) const { return m_it != other.m_it; }
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bool operator==(const const_iterator &other) const { return m_it == other.m_it; }
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bool operator!=(const const_iterator &other) const { return !(*this == other); }
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// Return a pointer to the same object returned by operator*.
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const ival* operator->() const {
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return &(**this);
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}
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};
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bool is_normalized() const {
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@ -316,5 +319,101 @@ public:
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}
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const_iterator begin() const { return m_coeffs.begin();}
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const_iterator end() const { return m_coeffs.end(); }
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// This iterator yields all (coefficient, variable) pairs
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// plus one final pair: (mpq(-1), j()).
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class ext_const_iterator {
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// We'll store a reference to the lar_term, and an
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// iterator into m_coeffs. Once we reach end of m_coeffs,
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// we'll yield exactly one extra pair, then we are done.
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const lar_term& m_term;
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lar_term::const_iterator m_it;
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bool m_done; // Have we gone past m_coeffs?
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public:
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// Construct either a "begin" iterator (end=false) or "end" iterator (end=true).
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ext_const_iterator(const lar_term& t, bool is_end)
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: m_term(t)
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, m_it(is_end ? t.end() : t.begin())
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, m_done(false)
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{
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// If it is_end == true, we represent a genuine end-iterator.
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if (is_end) {
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m_done = true;
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}
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}
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// Compare iterators. Two iterators are equal if both are "done" or hold the same internal iterator.
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bool operator==(ext_const_iterator const &other) const {
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// They are equal if they are both at the special extra pair or both at the same spot in m_coeffs.
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if (m_done && other.m_done) {
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return true;
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}
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return (!m_done && !other.m_done && m_it == other.m_it);
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}
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bool operator!=(ext_const_iterator const &other) const {
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return !(*this == other);
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}
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// Return the element we point to:
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// 1) If we haven't finished m_coeffs, yield (coefficient, var).
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// 2) If we've iterated past m_coeffs exactly once, return (mpq(-1), j()).
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auto operator*() const {
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if (!m_done && m_it != m_term.end()) {
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// Normal monomial from m_coeffs
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// Each entry is of type { m_value, m_key } in this context
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return *m_it;
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}
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else {
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// We've gone past normal entries, so return the extra pair
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// (mpq(-1), j()).
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return ival(m_term.j(), rational::minus_one());
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}
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}
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// Pre-increment
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ext_const_iterator& operator++() {
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if (!m_done && m_it != m_term.end()) {
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++m_it;
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}
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else {
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// We were about to return that extra pair:
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// after we move once more, we are done.
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m_done = true;
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}
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return *this;
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}
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// Post-increment
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ext_const_iterator operator++(int) {
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ext_const_iterator temp(*this);
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++(*this);
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return temp;
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}
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};
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// Return the begin/end of our extended iteration.
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// begin: starts at first real monomial
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// end: marks a finalized end of iteration
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ext_const_iterator ext_coeffs_begin() const {
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return ext_const_iterator(*this, /*is_end=*/false);
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}
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ext_const_iterator ext_coeffs_end() const {
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return ext_const_iterator(*this, /*is_end=*/true);
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}
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// Provide a small helper for "range-based for":
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// for (auto & [coef, var] : myTerm.ext_coeffs()) { ... }
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struct ext_range {
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ext_const_iterator b, e;
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ext_const_iterator begin() const { return b; }
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ext_const_iterator end() const { return e; }
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};
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// return an object that can be used in range-based for loops
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ext_range ext_coeffs() const {
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return { ext_coeffs_begin(), ext_coeffs_end() };
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}
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};
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}
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