Program Listing for File null_types.hpp
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// Copyright 2010, Willow Garage, Inc. All rights reserved.
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#ifndef MESSAGE_FILTERS__NULL_TYPES_HPP_
#define MESSAGE_FILTERS__NULL_TYPES_HPP_
#include <memory>
#include <rclcpp/rclcpp.hpp>
#include "message_filters/connection.hpp"
#include "message_filters/message_traits.hpp"
namespace message_filters
{
struct NullType
{
};
typedef std::shared_ptr<NullType const> NullTypeConstPtr;
template<class M>
struct NullFilter
{
template<typename C>
Connection registerCallback(const C &)
{
return Connection();
}
template<typename P>
Connection registerCallback(const std::function<void(P)> &)
{
return Connection();
}
};
namespace message_traits
{
template<>
struct TimeStamp<message_filters::NullType>
{
static rclcpp::Time value(const message_filters::NullType &)
{
return rclcpp::Time();
}
};
} // namespace message_traits
} // namespace message_filters
#endif // MESSAGE_FILTERS__NULL_TYPES_HPP_