clonable.h

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#ifndef META_UTIL_CLONABLE_H_
#define META_UTIL_CLONABLE_H_

#include <memory>
#include "util/shim.h"

namespace meta
{
namespace util
{

template <class Root, class Base, class Derived>
class multilevel_clonable : public Base
{
  public:
    using Base::Base;

    virtual std::unique_ptr<Root> clone() const
    {
        return make_unique<Derived>(static_cast<const Derived&>(*this));
    }
};

template <class Base, class Derived>
using clonable = multilevel_clonable<Base, Base, Derived>;
}
}
#endif