cpp-ch/local-engine/Common/BlockIterator.h

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
#pragma once

#include <Core/Block.h>

namespace local_engine
{
class BlockIterator
{
protected:
    void checkNextValid() const;
    // make current block available
    void produce();
    // consume current block
    void consume();
    bool isConsumed() const;
    DB::Block & currentBlock();
    void setCurrentBlock(DB::Block & block);

private:
    DB::Block cached_block;
    bool consumed = true;
};
}