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//                        Kokkos v. 2.0
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#include <cstdio>

#include <gtest/gtest.h>

#include <Kokkos_Core.hpp>
#include <Kokkos_DynRankView.hpp>

#include <type_traits>
#include <typeinfo>

namespace Test {

namespace {

template <typename ExecSpace >
struct TestViewCtorProp_EmbeddedDim {

  using ViewIntType     = typename Kokkos::View< int**, ExecSpace >;
  using ViewDoubleType     = typename Kokkos::View< double*, ExecSpace >;

  using DynRankViewIntType     = typename Kokkos::DynRankView< int, ExecSpace >;
  using DynRankViewDoubleType     = typename Kokkos::DynRankView< double, ExecSpace >;

  // Cuda 7.0 has issues with using a lamda in parallel_for to initialize the view - replace with this functor
  template < class ViewType >
  struct Functor {

    ViewType v;

    Functor( const ViewType & v_ ) : v(v_) {}

    KOKKOS_INLINE_FUNCTION
    void operator()( const int i ) const {
      v(i) = i;
    }

  };


  static void test_vcpt( const int N0, const int N1 )
  {

    // Create two views to test
    {
      using VIT = typename TestViewCtorProp_EmbeddedDim::ViewIntType ;
      using VDT = typename TestViewCtorProp_EmbeddedDim::ViewDoubleType ;

      VIT vi1("vi1", N0, N1);
      VDT vd1("vd1", N0);

      // TEST: Test for common type between two views, one with type double, other with type int
      // Deduce common value_type and construct a view with that type
      {
        // Two views
        auto view_alloc_arg = Kokkos::common_view_alloc_prop(vi1, vd1);
        typedef typename decltype( view_alloc_arg )::value_type                    CommonViewValueType;
        typedef typename Kokkos::View< CommonViewValueType*, ExecSpace >  CVT;
        typedef typename CVT::HostMirror                                           HostCVT;

        // Construct View using the common type; for case of specialization, an 'embedded_dim' would be stored by view_alloc_arg
        CVT cv1( Kokkos::view_alloc( "cv1", view_alloc_arg ), N0*N1 );

        Kokkos::parallel_for( Kokkos::RangePolicy< ExecSpace >(0, N0*N1), 
          Functor<CVT>(cv1)
        );

        HostCVT hcv1 = Kokkos::create_mirror_view( cv1 );
        Kokkos::deep_copy( hcv1, cv1 );

        ASSERT_EQ( (std::is_same< CommonViewValueType, double >::value) , true ) ;
      #if 0
      // debug output
      for ( int i = 0; i < N0*N1; ++i ) {
        printf(" Output check: hcv1(%d) = %lf\n ", i, hcv1(i) );
      }

      printf( " Common value type view: %s \n", typeid( CVT() ).name() );
      printf( " Common value type: %s \n", typeid( CommonViewValueType() ).name() );
      if ( std::is_same< CommonViewValueType, double >::value == true ) {
        printf("Proper common value_type\n");
      }
      else {
        printf("WRONG common value_type\n");
      }
      // end debug output
      #endif
      }

      {
        // Single view
        auto view_alloc_arg = Kokkos::common_view_alloc_prop(vi1);
        typedef typename decltype( view_alloc_arg )::value_type                    CommonViewValueType;
        typedef typename Kokkos::View< CommonViewValueType*, ExecSpace >  CVT;
        typedef typename CVT::HostMirror                                           HostCVT;

        // Construct View using the common type; for case of specialization, an 'embedded_dim' would be stored by view_alloc_arg
        CVT cv1( Kokkos::view_alloc( "cv1", view_alloc_arg ), N0*N1 );

        Kokkos::parallel_for( Kokkos::RangePolicy< ExecSpace >(0, N0*N1), 
          Functor<CVT>(cv1)
        );

        HostCVT hcv1 = Kokkos::create_mirror_view( cv1 );
        Kokkos::deep_copy( hcv1, cv1 );

        ASSERT_EQ( (std::is_same< CommonViewValueType, int>::value) , true ) ;
      }

    }

    // Create two dynamic rank views to test
    {
      using VIT = typename TestViewCtorProp_EmbeddedDim::DynRankViewIntType ;
      using VDT = typename TestViewCtorProp_EmbeddedDim::DynRankViewDoubleType ;

      VIT vi1("vi1", N0, N1);
      VDT vd1("vd1", N0);

      // TEST: Test for common type between two views, one with type double, other with type int
      // Deduce common value_type and construct a view with that type
      {
        // Two views
        auto view_alloc_arg = Kokkos::common_view_alloc_prop( vi1, vd1 );
        typedef typename decltype( view_alloc_arg )::value_type                    CommonViewValueType;
        typedef typename Kokkos::View< CommonViewValueType*, ExecSpace >  CVT;
        typedef typename CVT::HostMirror                                           HostCVT;

        // Construct View using the common type; for case of specialization, an 'embedded_dim' would be stored by view_alloc_arg
        CVT cv1( Kokkos::view_alloc( "cv1", view_alloc_arg ), N0*N1 );


        Kokkos::parallel_for( Kokkos::RangePolicy< ExecSpace >(0, N0*N1), 
          Functor<CVT>(cv1)
        );

        HostCVT hcv1 = Kokkos::create_mirror_view( cv1 );
        Kokkos::deep_copy( hcv1, cv1 );

        ASSERT_EQ( (std::is_same< CommonViewValueType, double >::value) , true ) ;
      }

      {
        // Single views
        auto view_alloc_arg = Kokkos::common_view_alloc_prop( vi1 );
        typedef typename decltype( view_alloc_arg )::value_type                    CommonViewValueType;
        typedef typename Kokkos::View< CommonViewValueType*, ExecSpace >  CVT;
        typedef typename CVT::HostMirror                                           HostCVT;

        // Construct View using the common type; for case of specialization, an 'embedded_dim' would be stored by view_alloc_arg
        CVT cv1( Kokkos::view_alloc( "cv1", view_alloc_arg ), N0*N1 );

        Kokkos::parallel_for( Kokkos::RangePolicy< ExecSpace >(0, N0*N1), 
          Functor<CVT>(cv1)
        );

        HostCVT hcv1 = Kokkos::create_mirror_view( cv1 );
        Kokkos::deep_copy( hcv1, cv1 );

        ASSERT_EQ( (std::is_same< CommonViewValueType, int>::value) , true ) ;
      }
    }


  } // end test_vcpt

}; // end struct

} // namespace

} // namespace Test
