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//                        Kokkos v. 2.0
//              Copyright (2014) Sandia Corporation
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#include <Kokkos_Core.hpp>

#ifndef TESTCXX11DEDUCTION_HPP
#define TESTCXX11DEDUCTION_HPP

namespace TestCXX11 {

struct TestReductionDeductionTagA {};
struct TestReductionDeductionTagB {};

template < class ExecSpace >
struct TestReductionDeductionFunctor {

  // KOKKOS_INLINE_FUNCTION
  // void operator()( long i , long & value ) const
  // { value += i + 1 ; }

  KOKKOS_INLINE_FUNCTION
  void operator()( TestReductionDeductionTagA , long i , long & value ) const
  { value += ( 2 * i + 1 ) + ( 2 * i + 2 ); }

  KOKKOS_INLINE_FUNCTION
  void operator()( const TestReductionDeductionTagB & , const long i , long & value ) const
  { value += ( 3 * i + 1 ) + ( 3 * i + 2 ) + ( 3 * i + 3 ) ; }

};

template< class ExecSpace >
void test_reduction_deduction()
{
  typedef TestReductionDeductionFunctor< ExecSpace > Functor ;

  const long N = 50 ;
  // const long answer  = N % 2 ? ( N * ((N+1)/2 )) : ( (N/2) * (N+1) );
  const long answerA = N % 2 ? ( (2*N) * (((2*N)+1)/2 )) : ( ((2*N)/2) * ((2*N)+1) );
  const long answerB = N % 2 ? ( (3*N) * (((3*N)+1)/2 )) : ( ((3*N)/2) * ((3*N)+1) );
  long result = 0 ;

  // Kokkos::parallel_reduce( Kokkos::RangePolicy<ExecSpace>(0,N) , Functor() , result );
  // ASSERT_EQ( answer , result );
  
  Kokkos::parallel_reduce( Kokkos::RangePolicy<ExecSpace,TestReductionDeductionTagA>(0,N) , Functor() , result );
  ASSERT_EQ( answerA , result );
  
  Kokkos::parallel_reduce( Kokkos::RangePolicy<ExecSpace,TestReductionDeductionTagB>(0,N) , Functor() , result );
  ASSERT_EQ( answerB , result );
}

}

#endif