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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 <vespa/vespalib/stllike/string.h>
#include <memory>
namespace document {
struct SpanTreeVisitor;
struct SpanNode {
using UP = std::unique_ptr<SpanNode>;
virtual ~SpanNode() = default;
vespalib::string toString() const;
virtual void accept(SpanTreeVisitor &visitor) const = 0;
};
std::ostream & operator << (std::ostream & os, const SpanNode & node);
} // namespace document
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