// return true if n contains a variable in the range [begin, end]
bool operator()(expr * n, unsigned begin = 0, unsigned end = UINT_MAX) {
m_contains = false;
m_window = end - begin;
m_todo.reset();
m_cache.reset();
m_todo.push_back(expr_delta_pair(n, begin));
while (!m_todo.empty()) {
expr_delta_pair e = m_todo.back();
if (visit_children(e.m_node, e.m_delta)) {
m_cache.insert(e);
m_todo.pop_back();
}
if (m_contains) {
return true;
}
}
SASSERT(!m_contains);
return false;
}
