Program Listing for File synchronizer.h

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#ifndef MESSAGE_FILTERS__SYNCHRONIZER_H_
#define MESSAGE_FILTERS__SYNCHRONIZER_H_

#include <deque>
#include <string>
#include <tuple>
#include <type_traits>
#include <vector>

#include "message_filters/connection.h"
#include "message_filters/null_types.h"
#include "message_filters/message_event.h"
#include "message_filters/signal9.h"

namespace message_filters
{

template<class Policy>
class Synchronizer : public noncopyable, public Policy
{
public:
  typedef typename Policy::Messages Messages;
  typedef typename Policy::Events Events;
  typedef typename Policy::Signal Signal;

  typedef typename std::tuple_element<0, Messages>::type M0;
  typedef typename std::tuple_element<1, Messages>::type M1;
  typedef typename std::tuple_element<2, Messages>::type M2;
  typedef typename std::tuple_element<3, Messages>::type M3;
  typedef typename std::tuple_element<4, Messages>::type M4;
  typedef typename std::tuple_element<5, Messages>::type M5;
  typedef typename std::tuple_element<6, Messages>::type M6;
  typedef typename std::tuple_element<7, Messages>::type M7;
  typedef typename std::tuple_element<8, Messages>::type M8;


  typedef typename std::tuple_element<0, Events>::type M0Event;
  typedef typename std::tuple_element<1, Events>::type M1Event;
  typedef typename std::tuple_element<2, Events>::type M2Event;
  typedef typename std::tuple_element<3, Events>::type M3Event;
  typedef typename std::tuple_element<4, Events>::type M4Event;
  typedef typename std::tuple_element<5, Events>::type M5Event;
  typedef typename std::tuple_element<6, Events>::type M6Event;
  typedef typename std::tuple_element<7, Events>::type M7Event;
  typedef typename std::tuple_element<8, Events>::type M8Event;

  static const uint8_t MAX_MESSAGES = 9;

  template<class F0, class F1>
  Synchronizer(F0& f0, F1& f1)
  {
    connectInput(f0, f1);
    init();
  }

  template<class F0, class F1, class F2>
  Synchronizer(F0& f0, F1& f1, F2& f2)
  {
    connectInput(f0, f1, f2);
    init();
  }

  template<class F0, class F1, class F2, class F3>
  Synchronizer(F0& f0, F1& f1, F2& f2, F3& f3)
  {
    connectInput(f0, f1, f2, f3);
    init();
  }

  template<class F0, class F1, class F2, class F3, class F4>
  Synchronizer(F0& f0, F1& f1, F2& f2, F3& f3, F4& f4)
  {
    connectInput(f0, f1, f2, f3, f4);
    init();
  }

  template<class F0, class F1, class F2, class F3, class F4, class F5>
  Synchronizer(F0& f0, F1& f1, F2& f2, F3& f3, F4& f4, F5& f5)
  {
    connectInput(f0, f1, f2, f3, f4, f5);
    init();
  }

  template<class F0, class F1, class F2, class F3, class F4, class F5, class F6>
  Synchronizer(F0& f0, F1& f1, F2& f2, F3& f3, F4& f4, F5& f5, F6& f6)
  {
    connectInput(f0, f1, f2, f3, f4, f5, f6);
    init();
  }

  template<class F0, class F1, class F2, class F3, class F4, class F5, class F6, class F7>
  Synchronizer(F0& f0, F1& f1, F2& f2, F3& f3, F4& f4, F5& f5, F6& f6, F7& f7)
  {
    connectInput(f0, f1, f2, f3, f4, f5, f6, f7);
    init();
  }

  template<class F0, class F1, class F2, class F3, class F4, class F5, class F6, class F7, class F8>
  Synchronizer(F0& f0, F1& f1, F2& f2, F3& f3, F4& f4, F5& f5, F6& f6, F7& f7, F8& f8)
  {
    connectInput(f0, f1, f2, f3, f4, f5, f6, f7, f8);
    init();
  }

  Synchronizer()
  {
    init();
  }

  template<class F0, class F1>
  Synchronizer(const Policy& policy, F0& f0, F1& f1)
  : Policy(policy)
  {
    connectInput(f0, f1);
    init();
  }

  template<class F0, class F1, class F2>
  Synchronizer(const Policy& policy, F0& f0, F1& f1, F2& f2)
  : Policy(policy)
  {
    connectInput(f0, f1, f2);
    init();
  }

  template<class F0, class F1, class F2, class F3>
  Synchronizer(const Policy& policy, F0& f0, F1& f1, F2& f2, F3& f3)
  : Policy(policy)
  {
    connectInput(f0, f1, f2, f3);
    init();
  }

  template<class F0, class F1, class F2, class F3, class F4>
  Synchronizer(const Policy& policy, F0& f0, F1& f1, F2& f2, F3& f3, F4& f4)
  : Policy(policy)
  {
    connectInput(f0, f1, f2, f3, f4);
    init();
  }

  template<class F0, class F1, class F2, class F3, class F4, class F5>
  Synchronizer(const Policy& policy, F0& f0, F1& f1, F2& f2, F3& f3, F4& f4, F5& f5)
  : Policy(policy)
  {
    connectInput(f0, f1, f2, f3, f4, f5);
    init();
  }

  template<class F0, class F1, class F2, class F3, class F4, class F5, class F6>
  Synchronizer(const Policy& policy, F0& f0, F1& f1, F2& f2, F3& f3, F4& f4, F5& f5, F6& f6)
  : Policy(policy)
  {
    connectInput(f0, f1, f2, f3, f4, f5, f6);
    init();
  }

  template<class F0, class F1, class F2, class F3, class F4, class F5, class F6, class F7>
  Synchronizer(const Policy& policy, F0& f0, F1& f1, F2& f2, F3& f3, F4& f4, F5& f5, F6& f6, F7& f7)
  : Policy(policy)
  {
    connectInput(f0, f1, f2, f3, f4, f5, f6, f7);
    init();
  }

  template<class F0, class F1, class F2, class F3, class F4, class F5, class F6, class F7, class F8>
  Synchronizer(const Policy& policy, F0& f0, F1& f1, F2& f2, F3& f3, F4& f4, F5& f5, F6& f6, F7& f7, F8& f8)
  : Policy(policy)
  {
    connectInput(f0, f1, f2, f3, f4, f5, f6, f7, f8);
    init();
  }

  Synchronizer(const Policy& policy)
  : Policy(policy)
  {
    init();
  }

  ~Synchronizer()
  {
    disconnectAll();
  }

  void init()
  {
    Policy::initParent(this);
  }

  template<class F0, class F1>
  void connectInput(F0& f0, F1& f1)
  {
    NullFilter<M2> f2;
    connectInput(f0, f1, f2);
  }

  template<class F0, class F1, class F2>
  void connectInput(F0& f0, F1& f1, F2& f2)
  {
    NullFilter<M3> f3;
    connectInput(f0, f1, f2, f3);
  }

  template<class F0, class F1, class F2, class F3>
  void connectInput(F0& f0, F1& f1, F2& f2, F3& f3)
  {
    NullFilter<M4> f4;
    connectInput(f0, f1, f2, f3, f4);
  }

  template<class F0, class F1, class F2, class F3, class F4>
  void connectInput(F0& f0, F1& f1, F2& f2, F3& f3, F4& f4)
  {
    NullFilter<M5> f5;
    connectInput(f0, f1, f2, f3, f4, f5);
  }

  template<class F0, class F1, class F2, class F3, class F4, class F5>
  void connectInput(F0& f0, F1& f1, F2& f2, F3& f3, F4& f4, F5& f5)
  {
    NullFilter<M6> f6;
    connectInput(f0, f1, f2, f3, f4, f5, f6);
  }

  template<class F0, class F1, class F2, class F3, class F4, class F5, class F6>
  void connectInput(F0& f0, F1& f1, F2& f2, F3& f3, F4& f4, F5& f5, F6& f6)
  {
    NullFilter<M7> f7;
    connectInput(f0, f1, f2, f3, f4, f5, f6, f7);
  }

  template<class F0, class F1, class F2, class F3, class F4, class F5, class F6, class F7>
  void connectInput(F0& f0, F1& f1, F2& f2, F3& f3, F4& f4, F5& f5, F6& f6, F7& f7)
  {
    NullFilter<M8> f8;
    connectInput(f0, f1, f2, f3, f4, f5, f6, f7, f8);
  }

  template<class F0, class F1, class F2, class F3, class F4, class F5, class F6, class F7, class F8>
  void connectInput(F0& f0, F1& f1, F2& f2, F3& f3, F4& f4, F5& f5, F6& f6, F7& f7, F8& f8)
  {
    disconnectAll();

    input_connections_[0] = f0.registerCallback(std::function<void(const M0Event&)>(std::bind(&Synchronizer::template cb<0>, this, std::placeholders::_1)));
    input_connections_[1] = f1.registerCallback(std::function<void(const M1Event&)>(std::bind(&Synchronizer::template cb<1>, this, std::placeholders::_1)));
    input_connections_[2] = f2.registerCallback(std::function<void(const M2Event&)>(std::bind(&Synchronizer::template cb<2>, this, std::placeholders::_1)));
    input_connections_[3] = f3.registerCallback(std::function<void(const M3Event&)>(std::bind(&Synchronizer::template cb<3>, this, std::placeholders::_1)));
    input_connections_[4] = f4.registerCallback(std::function<void(const M4Event&)>(std::bind(&Synchronizer::template cb<4>, this, std::placeholders::_1)));
    input_connections_[5] = f5.registerCallback(std::function<void(const M5Event&)>(std::bind(&Synchronizer::template cb<5>, this, std::placeholders::_1)));
    input_connections_[6] = f6.registerCallback(std::function<void(const M6Event&)>(std::bind(&Synchronizer::template cb<6>, this, std::placeholders::_1)));
    input_connections_[7] = f7.registerCallback(std::function<void(const M7Event&)>(std::bind(&Synchronizer::template cb<7>, this, std::placeholders::_1)));
    input_connections_[8] = f8.registerCallback(std::function<void(const M8Event&)>(std::bind(&Synchronizer::template cb<8>, this, std::placeholders::_1)));
  }

  template<class C>
  Connection registerCallback(C& callback)
  {
    return signal_.addCallback(callback);
  }

  template<class C>
  Connection registerCallback(const C& callback)
  {
    return signal_.addCallback(callback);
  }

  template<class C, typename T>
  Connection registerCallback(const C& callback, T* t)
  {
    return signal_.addCallback(callback, t);
  }

  template<class C, typename T>
  Connection registerCallback(C& callback, T* t)
  {
    return signal_.addCallback(callback, t);
  }

  void setName(const std::string& name) { name_ = name; }
  const std::string& getName() { return name_; }


  void signal(const M0Event& e0, const M1Event& e1, const M2Event& e2, const M3Event& e3, const M4Event& e4,
              const M5Event& e5, const M6Event& e6, const M7Event& e7, const M8Event& e8)
  {
    signal_.call(e0, e1, e2, e3, e4, e5, e6, e7, e8);
  }

  Policy* getPolicy() { return static_cast<Policy*>(this); }

  using Policy::add;

  template<int i>
  void add(const std::shared_ptr<typename std::tuple_element<i, Messages>::type const>& msg)
  {
    this->template add<i>(typename std::tuple_element<i, Events>::type(msg));
  }

private:

  void disconnectAll()
  {
    for (int i = 0; i < MAX_MESSAGES; ++i)
    {
      input_connections_[i].disconnect();
    }
  }

  template<int i>
  void cb(const typename std::tuple_element<i, Events>::type& evt)
  {
    this->template add<i>(evt);
  }

  uint32_t queue_size_;

  Signal signal_;

  Connection input_connections_[MAX_MESSAGES];

  std::string name_;
};

template<class... T> struct mp_plus;
template<> struct mp_plus<>
{
  using type = std::integral_constant<int, 0>;
};
template<class T1, class... T> struct mp_plus<T1, T...>
{
  static constexpr auto _v = !T1::value + mp_plus<T...>::type::value;
  using type = std::integral_constant<
    typename std::remove_const<decltype(_v)>::type, _v>;
};

template<class L, class V> struct mp_count;
template<template<class...> class L, class... T, class V>
  struct mp_count<L<T...>, V>
{
  using type = typename mp_plus<std::is_same<T, V>...>::type;
};

template<typename M0, typename M1, typename M2, typename M3, typename M4,
         typename M5, typename M6, typename M7, typename M8>
struct PolicyBase
{
  typedef typename mp_count<std::tuple<M0, M1, M2, M3, M4, M5, M6, M7, M8>, NullType>::type RealTypeCount;
  typedef std::tuple<M0, M1, M2, M3, M4, M5, M6, M7, M8> Messages;
  typedef Signal9<M0, M1, M2, M3, M4, M5, M6, M7, M8> Signal;
  typedef std::tuple<MessageEvent<M0 const>, MessageEvent<M1 const>, MessageEvent<M2 const>,
                     MessageEvent<M3 const>, MessageEvent<M4 const>, MessageEvent<M5 const>,
                     MessageEvent<M6 const>, MessageEvent<M7 const>, MessageEvent<M8 const> > Events;

  typedef typename std::tuple_element<0, Events>::type M0Event;
  typedef typename std::tuple_element<1, Events>::type M1Event;
  typedef typename std::tuple_element<2, Events>::type M2Event;
  typedef typename std::tuple_element<3, Events>::type M3Event;
  typedef typename std::tuple_element<4, Events>::type M4Event;
  typedef typename std::tuple_element<5, Events>::type M5Event;
  typedef typename std::tuple_element<6, Events>::type M6Event;
  typedef typename std::tuple_element<7, Events>::type M7Event;
  typedef typename std::tuple_element<8, Events>::type M8Event;
};

}  // namespace message_filters

#endif  // MESSAGE_FILTERS__SYNCHRONIZER_H_