MonGroupBuilder.h

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/*
 * Copyright (C) 2002-2019 CERN for the benefit of the ATLAS collaboration
 */
 
/******************************************************************************
 * @package Trigger/TrigAlgorithms/TrigEFMissingET
 * @class   MonGroupBuilder
 *
 * @brief Class to help with building monitoring groups
 * @author Jon Burr
 *****************************************************************************/
 
#ifndef TRIGEFMISSINGET_MONGROUPBUILDER_H
#define TRIGEFMISSINGET_MONGROUPBUILDER_H 1
 
#include "AthenaMonitoringKernel/MonitoredGroup.h"
#include <type_traits>
#include <memory>
 
 
namespace HLT { namespace MET {
  /****************************************************************************
  * @class MonGroupBuilder
  *
  * Class allowing incremental building of Monitored::Groups.
  *
  * Currently, it's only possible to load all members of a single
  * Monitored::Group simultaneously, i.e. it's not possible to build up the
  * group a few members at a time. However in these algorithms I found times
  * where I wanted to monitor several variables at the same time, but trigger
  * these from different locations.
  ***************************************************************************/
  class MonGroupBuilder {
    public:
      void add(Monitored::IMonitoredVariable& variable);

      template <typename T,
                typename = std::enable_if_t<
                  !std::is_lvalue_reference_v<T> &&
                  std::is_base_of_v<Monitored::IMonitoredVariable, T>>>
        void add(T&& variable)
        {
          m_ptrs.push_back(std::make_unique<T>(std::move(variable) ) );
          add(*m_ptrs.back() );
        }

      Monitored::Group build(
          const ToolHandle<GenericMonitoringTool>& tool) const;

      void increaseCapacity(std::size_t value, bool owned=false);
    private:
      std::vector<std::reference_wrapper<Monitored::IMonitoredVariable>> m_references;
      std::vector<std::unique_ptr<Monitored::IMonitoredVariable>> m_ptrs;
  }; //> end class MonGroupBuilder
} } //> end namespace HLT::MET
 
#endif //> !TRIGEFMISSINGET_MONGROUPBUILDER_H