ContainerRangeGuard.h

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/*
  Copyright (C) 2002-2026 CERN for the benefit of the ATLAS collaboration
  */
#ifndef PHASEII_CONTAINERRANGEGUARD_H
#define PHASEII_CONTAINERRANGEGUARD_H
 
namespace PhaseII {
 
// test whether the given container collection allows to ask for a new container
template <typename T_ContainerCollection>
concept hasDynamicContainerList = requires(T_ContainerCollection &a) { a.getNewContainerPtr(); };
 
// test whether the given container ptr has an associated container id.
template <typename T_ContainerPtr>
concept hasContainerId = requires(T_ContainerPtr &a) { a.containerId(); };
   
template <typename T_RangeType, typename T_ContainerPtr>
class ContainerRangeGuard {
public:
   ContainerRangeGuard(T_ContainerPtr ptr) : m_ptr(ptr), m_startIndex(m_ptr->size()) {}
   T_RangeType range() const {
      if constexpr(hasContainerId<T_ContainerPtr>) {
         return T_RangeType::makeDataRange(m_startIndex, m_ptr->size(),m_ptr.containerId());
      }
      else {
         return T_RangeType::makeDataRange(m_startIndex, m_ptr->size(),0u);
      }
   }
   std::size_t startIndex() const {
      return m_startIndex;
   }

   T_ContainerPtr &ptr() {
      return m_ptr;
   }

   const T_ContainerPtr &ptr() const {
      return m_ptr;
   }

   bool empty() const {
      return m_ptr->size() == m_startIndex;
   }
private:
   T_ContainerPtr m_ptr;
   std::size_t m_startIndex;
};
}
 
#endif