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introduce factor

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Signed-off-by: Lev <levnach@hotmail.com>
This commit is contained in:
Lev 2018-11-28 09:50:11 -08:00 • committed by Lev Nachmanson
parent c5c89704a6
commit f211be1e49
2 changed files with 45 additions and 26 deletions
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32
src/util/lp/factorization.h
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@ -26,16 +26,30 @@ namespace nla {
struct factorization_factory;
typedef unsigned lpvar;
enum class factor_type { VAR, RM}; // RM stands for rooted monomial
class factor {
unsigned m_index;
factor_type m_type;
public:
factor() {}
factor(unsigned i, factor_type t) : m_index(i), m_type(t) {}
unsigned index() const {return m_index;}
unsigned& index() {return m_index;}
factor_type type() const {return m_type;}
factor_type& type() {return m_type;}
};
class factorization {
svector<lpvar> m_vars;
vector<factor> m_vars;
public:
bool is_empty() const { return m_vars.empty(); }
svector<lpvar> & vars() { return m_vars; }
const svector<lpvar> & vars() const { return m_vars; }
unsigned operator[](unsigned k) const { return m_vars[k]; }
const vector<factor> & vars() const { return m_vars; }
factor operator[](unsigned k) const { return m_vars[k]; }
size_t size() const { return m_vars.size(); }
const lpvar* begin() const { return m_vars.begin(); }
const lpvar* end() const { return m_vars.end(); }
const factor* begin() const { return m_vars.begin(); }
const factor* end() const { return m_vars.end(); }
void push_back(factor v) {m_vars.push_back(v);}
};
struct const_iterator_mon {
@ -53,7 +67,7 @@ struct const_iterator_mon {
void init_vars_by_the_mask(unsigned_vector & k_vars, unsigned_vector & j_vars) const;
bool get_factors(unsigned& k, unsigned& j, rational& sign) const;
bool get_factors(factor& k, factor& j, rational& sign) const;
reference operator*() const;
void advance_mask();
@ -66,7 +80,7 @@ struct const_iterator_mon {
bool operator==(const self_type &other) const;
bool operator!=(const self_type &other) const;
factorization create_binary_factorization(lpvar j, lpvar k) const;
factorization create_binary_factorization(factor j, factor k) const;
factorization create_full_factorization() const;
};
@ -74,7 +88,7 @@ struct const_iterator_mon {
struct factorization_factory {
const svector<lpvar>& m_vars;
// returns true if found
virtual bool find_monomial_of_vars(const svector<lpvar>& vars, monomial& m, rational & sign) const = 0;
virtual bool find_monomial_of_vars(const svector<lpvar>& vars, unsigned& i) const = 0;
factorization_factory(const svector<lpvar>& vars) :
m_vars(vars) {