Plugins.h

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//==========================================================================
//  AIDA Detector description implementation 
//--------------------------------------------------------------------------
// Copyright (C) Organisation europeenne pour la Recherche nucleaire (CERN)
// All rights reserved.
//
// For the licensing terms see $DD4hepINSTALL/LICENSE.
// For the list of contributors see $DD4hepINSTALL/doc/CREDITS.
//
// Author     : M.Frank
//
//==========================================================================
#ifndef DD4HEP_PLUGINS_H
#define DD4HEP_PLUGINS_H
 
// Framework include files
#include <DD4hep/config.h>
 
// ROOT include files
#ifndef __CINT__
#include <string>
#include <typeinfo>
 
#include <any>
inline bool any_has_value(std::any a){ return a.has_value(); }
 
#ifndef DD4HEP_PARSERS_NO_ROOT
#include <RVersion.h>
#endif
 
namespace dd4hep {
 
  class Detector;
  class NamedObject;
  template <typename T> class Handle;
 
  struct PluginFactoryBase  {
    typedef std::string   str_t;
 
    template <typename T> static T* ptr(const T* _p)     { return (T*)_p;  }
    template <typename T> static T& ref(const T* _p)     { return *(T*)_p; }
    template <typename T> static T  val(const T* _p)     { return T(*_p);  }
    template <typename T> static T value(const void* _p) { return (T)_p;   }
    static const char*  value(const void* _p) { return (const char*)(_p);  }
  };
  template <> inline int PluginFactoryBase::value<int>(const void* _p) { return *(int*)(_p); }
  template <> inline long PluginFactoryBase::value<long>(const void* _p) { return *(long*)(_p); }
  template <> inline std::string PluginFactoryBase::value<std::string>(const void* _p) { return *(std::string*)(_p); }
  template <> inline const std::string& PluginFactoryBase::value<const std::string&>(const void* _p) { return *(std::string*)(_p); }
 
 
  struct PluginDebug {
    int m_debug;
    PluginDebug(int dbg = 2)  noexcept(false);
    ~PluginDebug()  noexcept(false);
    std::string missingFactory(const std::string& name) const;
  };
 
  class PluginService  {
  private:
  public:
    typedef std::any stub_t;
    template <typename R, typename... Args> static R Create(const std::string& id, Args... args)  {
      typedef R(*func)(Args...);
      std::any f;
      try   {
#if DD4HEP_PLUGINSVC_VERSION==1
        union { void* ptr; func fcn; } fptr;
        f = getCreator(id,typeid(R(Args...)));
        fptr.ptr = std::any_cast<void*>(f);
        if ( fptr.ptr )
          return (*fptr.fcn)(std::forward<Args>(args)...);
#elif DD4HEP_PLUGINSVC_VERSION==2
        f = getCreator(id,typeid(R(Args...)));
        if ( std::any_cast<func>(f) )
          return std::any_cast<func>(f)(std::forward<Args>(args)...);
#endif
      }
      catch(const std::bad_any_cast& e)   {
        print_bad_cast(id, f, typeid(R(Args...)), e.what());
      }
      return 0;
    }
    template <typename FUNCTION> static std::any function(FUNCTION func)  {
#if DD4HEP_PLUGINSVC_VERSION==1
      union { void* ptr; FUNCTION fcn; } fptr;
      fptr.fcn = func;
      return std::any(fptr.ptr);
#elif DD4HEP_PLUGINSVC_VERSION==2
      return std::any(func);
#endif
    }
    static bool debug();
    static bool setDebug(bool new_value);
    static stub_t getCreator(const std::string& id, const std::type_info& info);
    static void   addFactory(const std::string& id,
                             stub_t&& func,
                             const std::type_info& signature_type,
                             const std::type_info& return_type);
    static void print_bad_cast(const std::string& id, const stub_t& stub, const std::type_info& signature, const char* msg);
  };
 
  template <typename DD4HEP_SIGNATURE> class PluginRegistry {
  public:
    typedef PluginService svc_t;
    typedef DD4HEP_SIGNATURE signature_t;
    template <typename R, typename... Args>  static void add(const std::string& id, R(*func)(Args...))  {
      svc_t::addFactory(id,svc_t::function(func),typeid(R(Args...)),typeid(R));
    }
  };
} /* End namespace dd4hep      */
 
namespace {
  template <typename P, typename S> class Factory {};
}
 
#define DD4HEP_FACTORY_CALL(type,name,signature) dd4hep::PluginRegistry<signature>::add(name,Factory<type,signature>::call)
#define DD4HEP_IMPLEMENT_PLUGIN_REGISTRY(X,Y)
 
#define DD4HEP_OPEN_PLUGIN(ns,name)  namespace ns { namespace { struct name {}; } } namespace dd4hep
#define DD4HEP_PLUGINSVC_CNAME(name, serial)  name##_dict_##serial
#define DD4HEP_PLUGINSVC_FACTORY(type,name,signature,serial)            \
  namespace {                                                           \
    struct DD4HEP_PLUGINSVC_CNAME(__typeFactory__,serial)  {            \
      DD4HEP_PLUGINSVC_CNAME(__typeFactory__,serial)()  {               \
        DD4HEP_FACTORY_CALL(type,#name,signature); }};                  \
    static const DD4HEP_PLUGINSVC_CNAME(__typeFactory__,serial)         \
    DD4HEP_PLUGINSVC_CNAME(s____typeFactory__,serial);                  \
  }
 
 
#define DD4HEP_PLUGIN_FACTORY_ARGS_0(R)                                 \
  template <typename P> class Factory<P, R()>                           \
    : public dd4hep::PluginFactoryBase {                                \
  public:                                                               \
    static R call();                                                    \
  };                                                                    \
  template <typename P> inline R Factory<P,R()>::call()
  
#define DD4HEP_PLUGIN_FACTORY_ARGS_1(R,A0)                              \
  template <typename P> class Factory<P, R(A0)>                         \
    : public dd4hep::PluginFactoryBase  {                               \
  public:                                                               \
    static R call(A0 a0);                                               \
  };                                                                    \
  template <typename P> inline R Factory<P,R(A0)>::call(A0 a0)
 
#define DD4HEP_PLUGIN_FACTORY_ARGS_2(R,A0,A1)                           \
  template <typename P> class Factory<P, R(A0,A1)>                      \
    : public dd4hep::PluginFactoryBase  {                               \
  public:                                                               \
    static R call(A0 a0,A1 a1);                                         \
  };                                                                    \
  template <typename P> inline R Factory<P,R(A0,A1)>::call(A0 a0, A1 a1)
  
#define DD4HEP_PLUGIN_FACTORY_ARGS_3(R,A0,A1,A2)                        \
    template <typename P> class Factory<P, R(A0,A1,A2)>                 \
      : public dd4hep::PluginFactoryBase  {                             \
    public:                                                             \
      static R call(A0 a0,A1 a1,A2 a2);                                 \
    };                                                                  \
    template <typename P> inline R Factory<P,R(A0,A1,A2)>::call(A0 a0, A1 a1, A2 a2)
 
#define DD4HEP_PLUGIN_FACTORY_ARGS_4(R,A0,A1,A2,A3)                     \
    template <typename P> class Factory<P, R(A0,A1,A2,A3)>              \
      : public dd4hep::PluginFactoryBase  {                             \
    public:                                                             \
      static R call(A0 a0,A1 a1,A2 a2, A3 a3);                          \
    };                                                                  \
    template <typename P> inline R Factory<P,R(A0,A1,A2,A3)>::call(A0 a0, A1 a1, A2 a2, A3 a3)
  
#define DD4HEP_PLUGIN_FACTORY_ARGS_5(R,A0,A1,A2,A3,A4)                  \
    template <typename P> class Factory<P, R(A0,A1,A2,A3,A4)>           \
      : public dd4hep::PluginFactoryBase  {                             \
    public:                                                             \
      static R call(A0 a0,A1 a1,A2 a2, A3 a3, A4 a4);                   \
    };                                                                  \
    template <typename P> inline R Factory<P,R(A0,A1,A2,A3,A4)>::call(A0 a0, A1 a1, A2 a2, A3 a3, A4 a4)
  
#endif    /* __CINT__          */
#endif // DD4HEP_PLUGINS_H