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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/vespalib/stllike/string.h>
namespace vespalib { class Stash; }
namespace search::fef {
class FeatureType;
class FeatureExecutor;
class IQueryEnvironment;
class IObjectStore;
}
namespace search::features::rankingexpression {
/**
* Interface representing an intrinsic expression replacing the
* calculation of a ranking expression and its inputs.
**/
struct IntrinsicExpression {
using FeatureType = search::fef::FeatureType;
using FeatureExecutor = search::fef::FeatureExecutor;
using QueryEnv = search::fef::IQueryEnvironment;
using UP = std::unique_ptr<IntrinsicExpression>;
virtual vespalib::string describe_self() const = 0;
virtual const FeatureType &result_type() const = 0;
virtual void prepare_shared_state(const QueryEnv & env, fef::IObjectStore & store) const = 0;
virtual FeatureExecutor &create_executor(const QueryEnv &queryEnv, vespalib::Stash &stash) const = 0;
virtual ~IntrinsicExpression();
};
} // namespace search::features::rankingexpression
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