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pdd_linear_iterator

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This commit is contained in:
Jakob Rath 2023-07-08 20:08:03 +02:00
parent 397acd0089
commit 28810e55a0
2 changed files with 65 additions and 4 deletions
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30
src/math/dd/dd_pdd.cpp
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@ -1148,6 +1148,7 @@ namespace dd {
unsigned pdd_manager::max_pow2_divisor(PDD p) {
init_mark();
unsigned min_j = UINT_MAX;
SASSERT(m_todo.empty());
m_todo.push_back(p);
while (!m_todo.empty()) {
PDD r = m_todo.back();
@ -1986,5 +1987,32 @@ namespace dd {
return out;
}
void pdd_linear_iterator::first() {
m_next = m_pdd.root;
next();
}
}
void pdd_linear_iterator::next() {
SASSERT(m_next != pdd_manager::null_pdd);
auto& m = m_pdd.manager();
while (!m.is_val(m_next)) {
unsigned const var = m.var(m_next);
rational const val = m.offset(m.hi(m_next));
m_next = m.lo(m_next);
if (!val.is_zero()) {
m_mono = {val, var};
return;
}
}
m_next = pdd_manager::null_pdd;
}
pdd_linear_iterator pdd::pdd_linear_monomials::begin() const {
return pdd_linear_iterator(m_pdd, true);
}
pdd_linear_iterator pdd::pdd_linear_monomials::end() const {
return pdd_linear_iterator(m_pdd, false);
}
} // namespace dd