Observable.h

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// Copyright (c) Fraunhofer MEVIS, Germany. All rights reserved.
// **InsertLicense** code
 
#pragma once
 
#include <asio/Processor.h>
#include <asio/Signal.h>
 
 
namespace asio {
 
  template<typename... Args>
  class ObservableType;
 
  // see Executable.h for explanation of the vtordisp pragma
 
#ifdef _MSC_VER
#pragma vtordisp(push, 2)
#endif
  template<typename... Args>
  class ObservableType<ParameterPack<Args...>> : public virtual Processor
  {
  public:
 
    using OutputSignature = ParameterPack<Args...>;
 
    Signal<void(Args...)> signal;
  };
#ifdef _MSC_VER
#pragma vtordisp(pop)
#endif
 
  template<typename... Args>
  using ConstRefObservable = ObservableType<ParameterPack<const Args&...>>;
 
  template<typename... Args>
  using NonConstRefObservable = ObservableType<ParameterPack<Args&...>>;
 
  template<typename... Args>
  using Observable = ConstRefObservable<Args...>;
 
  using Trigger = Observable<>;
 
  template<typename... Args>
  class VoidOrArgsObservable
  {
  public:
    using Type = Observable<Args...>;
  };
 
  template<>
  class VoidOrArgsObservable<void>
  {
  public:
    using Type = Trigger;
  };
}