SerializeSTL.h

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/***********************************************************************************\
* (c) Copyright 1998-2019 CERN for the benefit of the LHCb and ATLAS collaborations *
*                                                                                   *
* This software is distributed under the terms of the Apache version 2 licence,     *
* copied verbatim in the file "LICENSE".                                            *
*                                                                                   *
* In applying this licence, CERN does not waive the privileges and immunities       *
* granted to it by virtue of its status as an Intergovernmental Organization        *
* or submit itself to any jurisdiction.                                             *
\***********************************************************************************/
#ifndef GAUDIKERNEL_SERIALIZESTL_H_
#define GAUDIKERNEL_SERIALIZESTL_H_

#include "GaudiKernel/HashMap.h"
#include "GaudiKernel/Map.h"
#include <array>
#include <list>
#include <map>
#include <ostream>
#include <utility>
#include <vector>

namespace GaudiUtils {
  template <class T1, class T2>
  std::ostream& operator<<( std::ostream& s, const std::pair<T1, T2>& p );

  template <class T, class ALLOC>
  std::ostream& operator<<( std::ostream& s, const std::vector<T, ALLOC>& v );

  template <class T, std::size_t N>
  std::ostream& operator<<( std::ostream& s, const std::array<T, N>& v );

  template <class T, class ALLOC>
  std::ostream& operator<<( std::ostream& s, const std::list<T, ALLOC>& l );

  template <class T1, class T2, class COMP, class ALLOC>
  std::ostream& operator<<( std::ostream& s, const std::map<T1, T2, COMP, ALLOC>& m );

  template <class K, class T, class M>
  std::ostream& operator<<( std::ostream& s, const GaudiUtils::Map<K, T, M>& m );

  template <class K, class T, class H, class M>
  std::ostream& operator<<( std::ostream& s, const GaudiUtils::HashMap<K, T, H, M>& m );

  namespace details {

    struct IdentityOutputter {
      template <typename T>
      std::ostream& operator()( std::ostream& os, T&& t ) const {
        return os << std::forward<T>( t );
      }
    };

    template <typename Stream, typename Iterator, typename Separator, typename OutputElement = IdentityOutputter>
    Stream& ostream_joiner( Stream& os, Iterator first, Iterator last, Separator sep,
                            OutputElement output = OutputElement{} ) {
      if ( first != last ) output( os, *first++ );
      while ( first != last ) output( os << sep, *first++ );
      return os;
    }

    template <typename Stream, typename Container, typename Separator, typename OutputElement = IdentityOutputter>
    Stream& ostream_joiner( Stream& os, const Container& c, Separator sep, OutputElement output = OutputElement{} ) {
      using std::begin, std::end;
      return ostream_joiner( os, begin( c ), end( c ), sep, output );
    }
  } // namespace details

  template <class T1, class T2>
  std::ostream& operator<<( std::ostream& s, const std::pair<T1, T2>& p ) {
    return s << '(' << p.first << ", " << p.second << ')';
  }

  template <class T, class ALLOC>
  std::ostream& operator<<( std::ostream& s, const std::vector<T, ALLOC>& v ) {
    return details::ostream_joiner( s << '[', v, ", " ) << ']';
  }

  template <class T, std::size_t N>
  std::ostream& operator<<( std::ostream& s, const std::array<T, N>& v ) {
    return details::ostream_joiner( s << '[', v, ", " ) << ']';
  }

  template <class T, class ALLOC>
  std::ostream& operator<<( std::ostream& s, const std::list<T, ALLOC>& l ) {
    return details::ostream_joiner( s << '[', l, ", " ) << ']';
  }

  template <class T1, class T2, class COMP, class ALLOC>
  std::ostream& operator<<( std::ostream& s, const std::map<T1, T2, COMP, ALLOC>& m ) {
    return details::ostream_joiner( s << "{", m, ", ",
                                    []( std::ostream& os, const std::pair<const T1, T2>& p ) -> std::ostream& {
                                      return os << p.first << ": " << p.second;
                                    } )
           << "}";
  }

  template <class K, class T, class M>
  std::ostream& operator<<( std::ostream& s, const GaudiUtils::Map<K, T, M>& m ) {
    // Serialize the internal map.
    return s << static_cast<const M&>( m );
  }

  template <class K, class T, class H, class M>
  std::ostream& operator<<( std::ostream& s, const GaudiUtils::HashMap<K, T, H, M>& m ) {
    // Copy the hash map into a map to have it ordered by key.
    return s << GaudiUtils::Map<K, T>( m.begin(), m.end() );
  }

} // namespace GaudiUtils

#endif /*GAUDIKERNEL_SERIALIZESTL_H_*/