/*
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//                        Kokkos v. 2.0
//              Copyright (2014) Sandia Corporation
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// Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
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#include <gtest/gtest.h>

#include <Kokkos_Core.hpp>
#include <stdexcept>
#include <sstream>
#include <iostream>

namespace Test {

template< class Space >
struct NestedView {
  Kokkos::View< int*, Space > member;

public:
  KOKKOS_INLINE_FUNCTION
  NestedView() : member() {}

  KOKKOS_INLINE_FUNCTION
  NestedView & operator=( const Kokkos::View< int*, Space > & lhs )
  {
    member = lhs;
    if ( member.extent(0) ) Kokkos::atomic_add( & member( 0 ), 1 );
    return *this;
  }

  KOKKOS_INLINE_FUNCTION
  ~NestedView()
  {
    if ( member.extent(0) ) {
      Kokkos::atomic_add( & member( 0 ), -1 );
    }
  }
};

template< class Space >
struct NestedViewFunctor {

  Kokkos::View< NestedView<Space> *, Space > nested;
  Kokkos::View< int*, Space >                array;

  NestedViewFunctor(
    const Kokkos::View< NestedView<Space> *, Space > & arg_nested,
    const Kokkos::View< int*, Space >                & arg_array )
  : nested( arg_nested )
  , array(  arg_array )
  {}

  KOKKOS_INLINE_FUNCTION
  void operator()( int i ) const { nested[i] = array; }
};

template< class Space >
void view_nested_view()
{
  Kokkos::View< int*, Space > tracking( "tracking", 1 );

  typename Kokkos::View< int*, Space >::HostMirror host_tracking = Kokkos::create_mirror( tracking );

  {
    Kokkos::View< NestedView<Space> *, Space > a( "a_nested_view", 2 );

    Kokkos::parallel_for( Kokkos::RangePolicy< Space >( 0, 2 ), NestedViewFunctor< Space >( a, tracking ) );
    Kokkos::deep_copy( host_tracking, tracking );
    ASSERT_EQ( 2, host_tracking( 0 ) );

    Kokkos::View< NestedView<Space> *, Space > b( "b_nested_view", 2 );
    Kokkos::parallel_for( Kokkos::RangePolicy< Space >( 0, 2 ), NestedViewFunctor< Space >( b, tracking ) );
    Kokkos::deep_copy( host_tracking, tracking );
    ASSERT_EQ( 4, host_tracking( 0 ) );

  }

  Kokkos::deep_copy( host_tracking, tracking );

  ASSERT_EQ( 0, host_tracking( 0 ) );
}

TEST_F( TEST_CATEGORY, view_nested_view )
{
  view_nested_view< TEST_EXECSPACE >();
}

} // namespace Test
