ClickHouse/dbms/include/DB/IO/WriteBufferFromFileBase.h

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#pragma once
#include <string>
#include <fcntl.h>
#include <DB/IO/WriteBuffer.h>
#include <DB/IO/BufferWithOwnMemory.h>
namespace DB
{
class WriteBufferFromFileBase : public BufferWithOwnMemory<WriteBuffer>
{
public:
WriteBufferFromFileBase(size_t buf_size, char * existing_memory, size_t alignment);
virtual ~WriteBufferFromFileBase();
off_t seek(off_t off, int whence = SEEK_SET);
virtual off_t getPositionInFile() = 0;
virtual void truncate(off_t length) = 0;
virtual void sync() = 0;
virtual std::string getFileName() const noexcept = 0;
virtual int getFD() const noexcept = 0;
protected:
virtual off_t doSeek(off_t off, int whence) = 0;
};
}