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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 "writable_memory.h"
namespace vespalib {
/**
* Interface used to abstract a destination for output data. Note that
* the output data itself is owned by the object implementing this
* interface.
**/
struct Output
{
/**
* Reserve space for more output data. The returned WritableMemory
* must contain at least the requested number of bytes.
*
* @return the reserved output data
* @param bytes number of bytes to reserve
**/
virtual WritableMemory reserve(size_t bytes) = 0;
/**
* Commit produced output data. Never commit more data than you
* have reserved.
*
* @return this object, for chaining
* @param bytes number of bytes to commit
**/
virtual Output &commit(size_t bytes) = 0;
virtual ~Output();
};
} // namespace vespalib
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