IsSTLSequence.h

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// Yo emacs, this is -*- c++ -*-
 
/*
  Copyright (C) 2002-2017 CERN for the benefit of the ATLAS collaboration
*/
 
/***************************************************************************
 determines whether CONTAINER is one of supported ATLAS sequences Requires
 CONTAINER to define value_type
 ----------------------------------------------------------------
 ATLAS Collaboration
 ***************************************************************************/
 
// $Id: IsSTLSequence.h,v 1.5 2008-11-17 19:24:52 ssnyder Exp $
 
#ifndef ATHLINKS_TOOLS_ISSTLSEQUENCE_H
# define ATHLINKS_TOOLS_ISSTLSEQUENCE_H
 
#include <vector>
#include <list>
#include <deque>
#include <type_traits>
 
 
 
// CLASS DECLARATIONS
namespace SG {
  // Some parts of Athena define FLAG as a macro.
  template <class CONTAINER, class FLAG_>
  struct TestSequenceTag
  {
    typedef std::false_type type;
  };
 
  template <class CONTAINER>
  struct TestSequenceTag<CONTAINER, typename CONTAINER::isSequence>
  {
    typedef typename CONTAINER::isSequence type;
  };
 
  template <class CONTAINER>
  struct IsSTLSequence {
  private:
    // Causes trouble with fwd decls?  cf xAODTruth?
    //BOOST_CONCEPT_ASSERT((boost::ContainerConcept<CONTAINER>));
    typedef typename CONTAINER::value_type value_type;
 
    // vectors
    typedef typename std::is_base_of< std::vector<value_type>, CONTAINER> isVector;
 
    // lists
    typedef typename std::is_base_of< std::list<value_type>, CONTAINER> isList;
 
    // queues
    typedef typename std::is_base_of< std::deque<value_type>, CONTAINER> isDeque;
 
    // explicit tag, by adding
    //   typedef type_tools::true_tag isSequence;
    // to a class.
    typedef typename TestSequenceTag<CONTAINER, std::true_type>::type hasSequenceTag;
 
  public:
    //putting it all together
    static const bool value =
      isDeque::value ||
      isList::value ||
      isVector::value ||
      hasSequenceTag::value;
  };
}
#endif // ATHLINKS_TOOLS_ISSTLSEQUENCE_H