moduleAbilities.h

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#ifndef FWCore_Framework_moduleAbilities_h
#define FWCore_Framework_moduleAbilities_h
// -*- C++ -*-
//
// Package:     FWCore/Framework
// Class  :     moduleAbilities
//
//
// Original Author:  Chris Jones
//         Created:  Tue, 07 May 2013 19:19:53 GMT
//

// system include files
#include <type_traits>

// user include files
#include "FWCore/Framework/interface/moduleAbilityEnums.h"

// forward declarations

namespace edm {
  namespace module {
    //Used in the case where ability is not available
    struct Empty{};
  }

  template<typename T>
  struct GlobalCache {
    static constexpr module::Abilities kAbilities=module::Abilities::kGlobalCache;
    typedef T Type;
  };

  template<typename T>
  struct StreamCache {
    static constexpr module::Abilities kAbilities=module::Abilities::kStreamCache;
    typedef T Type;
  };

  template<typename T>
  struct RunCache {
    static constexpr module::Abilities kAbilities=module::Abilities::kRunCache;
    typedef T Type;
  };

  template<typename T>
  struct LuminosityBlockCache {
    static constexpr module::Abilities kAbilities=module::Abilities::kLuminosityBlockCache;
    typedef T Type;
  };

  template<typename T>
  struct RunSummaryCache {
    static constexpr module::Abilities kAbilities=module::Abilities::kRunSummaryCache;
    typedef T Type;
  };

  template<typename T>
  struct LuminosityBlockSummaryCache {
    static constexpr module::Abilities kAbilities=module::Abilities::kLuminosityBlockSummaryCache;
    typedef T Type;
  };

  struct BeginRunProducer {
    static constexpr module::Abilities kAbilities=module::Abilities::kBeginRunProducer;
    typedef module::Empty Type;
  };

  struct EndRunProducer {
    static constexpr module::Abilities kAbilities=module::Abilities::kEndRunProducer;
    typedef module::Empty Type;
  };

  struct BeginLuminosityBlockProducer {
    static constexpr module::Abilities kAbilities=module::Abilities::kBeginLuminosityBlockProducer;
    typedef module::Empty Type;
  };

  struct EndLuminosityBlockProducer {
    static constexpr module::Abilities kAbilities=module::Abilities::kEndLuminosityBlockProducer;
    typedef module::Empty Type;
  };

  struct WatchInputFiles {
    static constexpr module::Abilities kAbilities=module::Abilities::kWatchInputFiles;
    typedef module::Empty Type;
  };

  struct ExternalWork {
    static constexpr module::Abilities kAbilities=module::Abilities::kExternalWork;
    typedef module::Empty Type;
  };

  //Recursively checks VArgs template arguments looking for the ABILITY
  template<module::Abilities ABILITY, typename... VArgs> struct CheckAbility;

  template<module::Abilities ABILITY, typename T, typename... VArgs>
  struct CheckAbility<ABILITY,T,VArgs...> {
    static constexpr bool kHasIt = (T::kAbilities==ABILITY) | CheckAbility<ABILITY,VArgs...>::kHasIt;
    typedef std::conditional_t<(T::kAbilities==ABILITY),
                               typename T::Type,
                               typename CheckAbility<ABILITY,VArgs...>::Type> Type;
  };

  //End of the recursion
  template<module::Abilities ABILITY>
  struct CheckAbility<ABILITY> {
    static constexpr bool kHasIt=false;
    typedef edm::module::Empty Type;
  };

  template<typename... VArgs>
  struct WantsGlobalRunTransitions {
    static constexpr bool value = CheckAbility<module::Abilities::kRunCache,VArgs...>::kHasIt or
    CheckAbility<module::Abilities::kRunSummaryCache,VArgs...>::kHasIt or
    CheckAbility<module::Abilities::kBeginRunProducer,VArgs...>::kHasIt or
    CheckAbility<module::Abilities::kEndRunProducer, VArgs...>::kHasIt;
  };
  
  template<typename... VArgs>
  struct WantsGlobalLuminosityBlockTransitions {
    static constexpr bool value = CheckAbility<module::Abilities::kLuminosityBlockCache,VArgs...>::kHasIt or
    CheckAbility<module::Abilities::kLuminosityBlockSummaryCache,VArgs...>::kHasIt or
    CheckAbility<module::Abilities::kBeginLuminosityBlockProducer,VArgs...>::kHasIt or
    CheckAbility<module::Abilities::kEndLuminosityBlockProducer, VArgs...>::kHasIt;
  };

  template<typename... VArgs>
  struct WantsStreamRunTransitions {
    static constexpr bool value = CheckAbility<module::Abilities::kStreamCache,VArgs...>::kHasIt or
    CheckAbility<module::Abilities::kRunSummaryCache,VArgs...>::kHasIt ;
  };
  
  template<typename... VArgs>
  struct WantsStreamLuminosityBlockTransitions {
    static constexpr bool value = CheckAbility<module::Abilities::kStreamCache,VArgs...>::kHasIt or
    CheckAbility<module::Abilities::kLuminosityBlockSummaryCache,VArgs...>::kHasIt;
  };

}

#endif