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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 "node_visitor.h"
namespace vespalib {
namespace eval {
namespace nodes {
/**
* A templated visitor used to check if the visited node matches any
* of the given types.
**/
template <typename... TYPES> struct CheckTypeVisitor;
template <>
struct CheckTypeVisitor<> : EmptyNodeVisitor {
bool result = false;
};
template <typename HEAD, typename... TAIL>
struct CheckTypeVisitor<HEAD, TAIL...> : CheckTypeVisitor<TAIL...> {
virtual void visit(const HEAD &) override { this->result = true; }
};
template <typename... TYPES>
bool check_type(const nodes::Node &node) {
CheckTypeVisitor<TYPES...> check;
node.accept(check);
return check.result;
}
} // namespace vespalib::eval::nodes
} // namespace vespalib::eval
} // namespace vespalib
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