IntSeqSplit.hpp

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#ifndef _INTSEQSPLIT_HPP
#define _INTSEQSPLIT_HPP

/// \file IntSeqSplit.hpp
///
/// \brief Take portions of integer sequences

#include <ints/IntSeq.hpp>

namespace SUNphi
{
  /// Returns the first N components of an IntSeq
  ///
  /// Internal implementation
  template <int N,       // Number of id to take
        typename ISeq, // IntSeq to operate upon
        typename=ConstrainIsIntSeq<ISeq>>
  struct _IntSeqFirstN
  {
    /// Internal type
    using type=typename IntSeq<>::AppendFirstN<N,ISeq>;
  };

  /// Returns the first N components of an IntSeq
  ///
  /// Gives visibility to internal implementation
  template <int N,
        typename ISeq,
        typename=EnableIf<isIntSeq<ISeq>>>
  using IntSeqFirstN=typename _IntSeqFirstN<N,ISeq>::type;

  /////////////////////////////////////////////////////////////////

  /// Filter an IntSeq according to another one
  ///
  /// Internal implementation, forward declaration
  template <typename Is,
        typename Fi>
  struct _IntSeqFilter;

  /// Filter an IntSeq according to another one
  ///
  /// Internal implementation
  template <int...Ints,
        int...Ids>
  struct _IntSeqFilter<IntSeq<Ints...>,IntSeq<Ids...>>
  {
    /// Internal type
    using type=IntSeq<getIntOfList<Ids,Ints...>...>;
  };

  /// Filter an IntSeq according to another one
  template <typename Is,
        typename Fi>
  using IntSeqFilter=typename _IntSeqFilter<Is,Fi>::type;
}

#endif