EDGetToken.h

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#ifndef FWCore_Utilities_EDGetToken_h
#define FWCore_Utilities_EDGetToken_h
// -*- C++ -*-
//
// Package:     FWCore/Utilities
// Class  :     EDGetToken
// 
//
// Original Author:  Chris Jones
//         Created:  Wed, 03 Apr 2013 17:54:11 GMT
//

// system include files

// user include files

// forward declarations
namespace edm {
  class EDConsumerBase;
  template <typename T> class EDGetTokenT;
  
  class EDGetToken
  {
    friend class EDConsumerBase;
    
  public:
    
    EDGetToken() : m_value{s_uninitializedValue} {}

    template<typename T>
    EDGetToken(EDGetTokenT<T> iOther): m_value{iOther.m_value} {}

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

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

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

    // ---------- member data --------------------------------
    unsigned int m_value;
  };

  template<typename T>
  class EDGetTokenT
  {
    friend class EDConsumerBase;
    friend class EDGetToken;

  public:

    EDGetTokenT() : m_value{s_uninitializedValue} {}
  
    // ---------- const member functions ---------------------
    unsigned int index() const { return m_value; }
    bool isUninitialized() const { return m_value == s_uninitializedValue; }

  private:
    //for testing
    friend class TestEDGetToken;

    static const unsigned int s_uninitializedValue = 0xFFFFFFFF;

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

    // ---------- member data --------------------------------
    unsigned int m_value;
  };
}

#endif