Class scope

relmodel.hh:79–115

};

struct scope {
  struct scope *parent;
  /// available to table_ref productions
  vector<named_relation*> tables;
 /// available to column_ref productions
  vector<named_relation*> refs;
  struct schema *schema;
  /// Counters for prefixed stmt-unique identifiers
  shared_ptr<map<string,unsigned int> > stmt_seq;
  scope(struct scope *parent = 0) : parent(parent) {
    if (parent) {
      schema = parent->schema;
      tables = parent->tables;
      refs = parent->refs;
      stmt_seq = parent->stmt_seq;
    }
  }
  vector<pair<named_relation*, column> > refs_of_type(sqltype *t) {
    vector<pair<named_relation*, column> > result;
    for (auto r : refs)
      for (auto c : r->columns())
	if (t->consistent(c.type))
	  result.push_back(make_pair(r,c));
    return result;
  }
  /** Generate unique identifier with prefix. */
  string stmt_uid(const char* prefix) {
    string result(prefix);
    result += "_";
    result += std::to_string((*stmt_seq)[result]++);
    return result;
  }
  /** Reset unique identifier counters. */
  void new_stmt() {
    stmt_seq = std::make_shared<map<string,unsigned int> >();
  }
};

struct op {
  string name;