EngineId.h

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#ifndef NURANDOM_RANDOMUTILS_PROVIDERS_ENGINEID_H
#define NURANDOM_RANDOMUTILS_PROVIDERS_ENGINEID_H 1

#include <string>
#include <ostream>

namespace rndm {

  namespace SeedMasterHelper {
    
    struct EngineId {
      
      struct Global_t {};
      
      static constexpr Global_t global{};
      
      EngineId(std::string const& mod, std::string const& inst = std::string()):
        moduleLabel(mod),
        instanceName(inst)
        {}
      
      EngineId(std::string const& inst, Global_t):
        moduleLabel(),
        instanceName(inst)
        {}
      
      // Accept compiler written d'tor, copy c'tor, copy and move assignments.
      
      bool isGlobal() const { return moduleLabel.empty(); }
      
      bool hasInstanceName() const { return !instanceName.empty(); }
      
      void setGlobal(std::string inst)
        { moduleLabel.clear(); instanceName = inst; }
      
      
      bool operator== (EngineId const& rhs) const
        {
          if ( moduleLabel  != rhs.moduleLabel  ) return false;
          if ( instanceName != rhs.instanceName ) return false;
          return true;
        } // operator== ()
      
      bool operator< (EngineId const& rhs) const
        {
          if (moduleLabel  < rhs.moduleLabel) return true;
          if (moduleLabel == rhs.moduleLabel) {
            if (instanceName < rhs.instanceName) return true;
          }
          return false;
        } // operator< ()
      
      operator std::string() const
        {
          std::string id = moduleLabel;
          if (hasInstanceName()) id.append(1, '.').append(instanceName);
          return id;
        } // operator std::string()
      
      std::string artName() const { return moduleLabel + ':' + instanceName; }
      
      std::string moduleLabel; 
      std::string instanceName; 
      
    }; // end class EngineId
    
    inline std::ostream& operator<<
      (std::ostream& ost, const EngineId& id )
      { return ost << std::string(id); }
    
  } // end namespace SeedMasterHelper
  
} // namespace sim

#endif // NURANDOM_RANDOMUTILS_PROVIDERS_ENGINEID_H