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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include <memory>
#include <vespa/eval/eval/cell_type.h>
#include <vespa/eval/eval/typed_cells.h>
#include <vespa/vespalib/util/arrayref.h>
#include "distance_function.h"
namespace vespalib::eval { struct TypedCells; }
namespace search::tensor {
/**
* Interface used to calculate the distance from a prebound n-dimensional vector.
*
* Use from a single thread only - not required to be thread safe.
* The actual implementation may keep state about the prebound vector and
* mutable temporary storage.
*/
class BoundDistanceFunction : public DistanceConverter {
public:
using UP = std::unique_ptr<BoundDistanceFunction>;
BoundDistanceFunction() = default;
virtual ~BoundDistanceFunction() = default;
// calculate internal distance (comparable)
virtual double calc(const vespalib::eval::TypedCells& rhs) const = 0;
// calculate internal distance, early return allowed if > limit
virtual double calc_with_limit(const vespalib::eval::TypedCells& rhs,
double limit) const = 0;
};
}
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