Signal.hpp

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#ifndef DART_COMMON_SIGNAL_HPP_
#define DART_COMMON_SIGNAL_HPP_
 
#include <functional>
#include <memory>
#include <set>
 
#include "dart/common/detail/ConnectionBody.hpp"
 
namespace dart {
namespace common {
 
class Connection
{
public:
  Connection();
 
  Connection(const Connection& _other);
 
  Connection(Connection&& _other);
 
  Connection& operator=(const Connection& _other);
 
  Connection& operator=(Connection&& _other);
 
  virtual ~Connection();
 
  bool isConnected() const;
 
  void disconnect() const;
 
  template <typename _Signature, template<class> class Combiner>
  friend class Signal;
 
protected:
  Connection(
      const std::weak_ptr<signal::detail::ConnectionBodyBase>& _connectionBody);
 
  Connection(
      std::weak_ptr<signal::detail::ConnectionBodyBase>&& _connectionBody);
 
private:
  std::weak_ptr<signal::detail::ConnectionBodyBase> mWeakConnectionBody;
};
 
class ScopedConnection : public Connection
{
public:
  ScopedConnection(const Connection& _other);
 
  ScopedConnection(Connection&& _other);
 
  virtual ~ScopedConnection();
};
 
template <typename _Signature,
          template<class> class Combiner = signal::detail::DefaultCombiner>
class Signal;
 
template <typename _Res, typename... _ArgTypes, template<class> class Combiner>
class Signal<_Res(_ArgTypes...), Combiner>
{
public:
  using ResultType    = _Res;
  using SlotType      = std::function<ResultType(_ArgTypes...)>;
  using SignalType    = Signal<_Res(_ArgTypes...), Combiner>;
 
  using ConnectionBodyType = signal::detail::ConnectionBody<SlotType>;
  using ConnectionSetType
    = std::set<std::shared_ptr<ConnectionBodyType>,
               std::owner_less<std::shared_ptr<ConnectionBodyType>>>;
 
  Signal();
 
  virtual ~Signal();
 
  Connection connect(const SlotType& _slot);
 
  Connection connect(SlotType&& _slot);
 
  void disconnect(const Connection& _connection) const;
 
  void disconnectAll();
 
  void cleanupConnections();
 
  std::size_t getNumConnections() const;
 
  template <typename... ArgTypes>
  ResultType raise(ArgTypes&&... _args);
 
  template <typename... ArgTypes>
  ResultType operator()(ArgTypes&&... _args);
 
private:
  ConnectionSetType mConnectionBodies;
};
 
template <typename... _ArgTypes>
class Signal<void(_ArgTypes...)>
{
public:
  using SlotType   = std::function<void(_ArgTypes...)>;
  using SignalType = Signal<void(_ArgTypes...)>;
 
  using ConnectionBodyType = signal::detail::ConnectionBody<SlotType>;
  using ConnectionSetType
    = std::set<std::shared_ptr<ConnectionBodyType>,
               std::owner_less<std::shared_ptr<ConnectionBodyType>>>;
 
  Signal();
 
  virtual ~Signal();
 
  Connection connect(const SlotType& _slot);
 
  Connection connect(SlotType&& _slot);
 
  void disconnect(const Connection& _connection) const;
 
  void disconnectAll();
 
  void cleanupConnections();
 
  std::size_t getNumConnections() const;
 
  template <typename... ArgTypes>
  void raise(ArgTypes&&... _args);
 
  template <typename... ArgTypes>
  void operator()(ArgTypes&&... _args);
 
private:
  ConnectionSetType mConnectionBodies;
};
 
template <typename T>
class SlotRegister
{
public:
  using SlotType   = typename T::SlotType;
  using SignalType = typename T::SignalType;
 
  SlotRegister(typename T::SignalType& _signal);
 
  Connection connect(const SlotType& _slot);
 
private:
  typename T::SignalType& mSignal;
};
 
}  // namespace common
}  // namespace dart
 
#include "dart/common/detail/Signal.hpp"
 
#endif  // DART_COMMON_SIGNAL_HPP_