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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include "memory.h"
namespace vespalib {
/**
* Interface used to abstract a source of input data. Note that the
* input data itself is owned by the object implementing this
* interface.
**/
struct Input
{
/**
* Obtain more input data. An empty Memory should be returned if
* and only if all input data has been exhausted.
*
* @return the obtained input data
**/
virtual Memory obtain() = 0;
/**
* Evict processed input data. Never evict more data than you have
* obtained.
*
* @return this object, for chaining
* @param bytes the number of bytes to evict
**/
virtual Input &evict(size_t bytes) = 0;
virtual ~Input();
};
} // namespace vespalib
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