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// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
/**
* @class vespalib::Cloneable
* @brief Superclass for objects implementing clone() deep copy.
*/
#include <memory>
namespace vespalib {
class Cloneable {
public:
/**
* @brief Creates a clone of this instance.
*
* Note that the caller takes ownership of the returned object. It
* is not an unique_ptr since that would not support covariant
* return types. A class T that inherits this interface should
* define T* clone() const, such that people cloning a T object
* don't need to cast it to get the correct type.
*/
virtual Cloneable* clone() const = 0;
virtual ~Cloneable() {}
};
} // namespace vespalib
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