EDPutToken.h

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#ifndef FWCore_Utilities_EDPutToken_h
#define FWCore_Utilities_EDPutToken_h
// -*- C++ -*-
//
// Package:     FWCore/Utilities
// Class  :     EDPutToken
// 
//
// Original Author:  Chris Jones
//         Created:  Mon, 18 Sep 2017 17:54:11 GMT
//

// system include files

// user include files

// forward declarations
namespace edm {
  class ProductRegistryHelper;
  template <typename T> class EDPutTokenT;
  
  class EDPutToken
  {
    friend class ProductRegistryHelper;
    
  public:
    using value_type = unsigned int;
    
    EDPutToken() : m_value{s_uninitializedValue} {}

    template<typename T>
    EDPutToken(EDPutTokenT<T> iOther): m_value{iOther.m_value} {}

    // ---------- const member functions ---------------------
    value_type index() const { return m_value; }
    bool isUninitialized() const { return m_value == s_uninitializedValue; }

  private:
    //for testing
    friend class TestEDPutToken;
    
    static const unsigned int s_uninitializedValue = 0xFFFFFFFF;

    explicit EDPutToken(unsigned int iValue) : m_value(iValue) { }

    // ---------- member data --------------------------------
    value_type m_value;
  };

  template<typename T>
  class EDPutTokenT
  {
    friend class ProductRegistryHelper;
    friend class EDPutToken;

  public:
    using value_type = EDPutToken::value_type;

    
    EDPutTokenT() : m_value{s_uninitializedValue} {}
  
    // ---------- const member functions ---------------------
    value_type index() const { return m_value; }
    bool isUninitialized() const { return m_value == s_uninitializedValue; }

  private:
    //for testing
    friend class TestEDPutToken;

    static const unsigned int s_uninitializedValue = 0xFFFFFFFF;

    explicit EDPutTokenT(unsigned int iValue) : m_value(iValue) { }

    // ---------- member data --------------------------------
    value_type m_value;
  };
}

#endif