text: #ifndef UNITTEST_GUNIT_FAKE_INTEGER_ITERATOR_H_
  #define UNITTEST_GUNIT_FAKE_INTEGER_ITERATOR_H_
  
  /* Copyright (c) 2019, 2020, Oracle and/or its affiliates.
  
     This program is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License, version 2.0,
     as published by the Free Software Foundation.
  
     This program is also distributed with certain software (including
     but not limited to OpenSSL) that is licensed under separate terms,
     as designated in a particular file or component or in included license
     documentation.  The authors of MySQL hereby grant you an additional
     permission to link the program and your derivative works with the
     separately licensed software that they have included with MySQL.
  
     This program is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU General Public License, version 2.0, for more details.
  
     You should have received a copy of the GNU General Public License
     along with this program; if not, write to the Free Software
     Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA  */
  
  #include <random>
  #include <string>
  #include <vector>
  
  #include "sql/field.h"
  #include "sql/row_iterator.h"
  #include "sql/sql_class.h"
  
  // An implementation of a RowIterator that contains a user-defined set of
  // integer values, without having to set up the entire SQL machinery. It works
  // just like any other iterator; you call Init() before doing any reads, and you
  // call Read() until it returns -1 (no more data).
  //
  // The iterator is expected to only work on a single-column table, and the
  // column must be given to the iterator constructor.
  class FakeIntegerIterator final : public TableRowIterator {
   public:
    FakeIntegerIterator(THD *thd, TABLE *table, Field_long *field,
                        std::vector<int> dataset)
        : TableRowIterator(thd, table),
          m_field(field),
          m_dataset(move(dataset)) {}
  
    bool Init() override {
      m_current_index = 0;
      return false;
    }
  
    int Read() override {
      if (m_current_index == m_dataset.size()) {
        return -1;
      }
  
      m_field->store(m_dataset[m_current_index++], /* is_unsigned */ false);
      return 0;
    }
  
   private:
    size_t m_current_index{0};
    Field_long *m_field;
    std::vector<int> m_dataset;
  };
  
  #endif  // UNITTEST_GUNIT_FAKE_INTEGER_ITERATOR_H_
  