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C++ Amp のindexクラスについて、の簡単明瞭サンプル。

#include 

using namespace concurrency;
void test1()

{

     std::vector data(10);    

     for (int count = 0; count < 5; count++)

     {

          data[count] = count; // 0,1,2,3,4

     }

         

     concurrency::array a(2,5, data.begin(), data.end()); // 2x5


     parallel_for_each(         

          a.extent,

          [=, &a](index<2> idx) restrict(amp) // 2 is two dimension.

          {                                            

               int x = idx[0]; // 0-1 (2)

               int y = idx[1]; // 0-4 (5)

              

               UINT sum = 0;
               for( auto i = 0; i <= y; i++ )

                    sum += a[ index<2>(0,i) ]; // sum input value
               a[ index<2>(1,y) ] = sum;
          }

     );
     data = a;

    

     for (int i = 0; i < 10; i++)

     {         

          std::cout << data[i] << "\n"; // 0,1,2,3,4,0,1,3,6,10

     }

}