ClickHouse/dbms/DataStreams/OwningBlockInputStream.h

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#pragma once
#include <memory>
#include <DataStreams/IBlockInputStream.h>
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namespace DB
{
/** Provides reading from a Buffer, taking exclusive ownership over it's lifetime,
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* simplifies usage of ReadBufferFromFile (no need to manage buffer lifetime) etc.
*/
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template <typename OwnType>
class OwningBlockInputStream : public IBlockInputStream
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{
public:
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OwningBlockInputStream(const BlockInputStreamPtr & stream_, std::unique_ptr<OwnType> own_)
: stream{stream_}, own{std::move(own_)}
{
children.push_back(stream);
}
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Block getHeader() const override { return children.at(0)->getHeader(); }
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private:
Block readImpl() override { return stream->read(); }
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String getName() const override { return "Owning"; }
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protected:
BlockInputStreamPtr stream;
std::unique_ptr<OwnType> own;
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};
}