2021-12-10

Tech Programing

程式人小天地

Is there a way to have a stdarray the same size as MPI_Comm_size?

1 min read


I have a program where I am trying to gather up a set of data into an std::array however I cannot get this to work when the size of my array is set to the value of the world size. I get the following error:

MPITests.cpp:16:21: error: the value of ‘size’ is not usable in a constant expression
   16 |     std::array<int, size> gatheredRanks2;
      |                     ^~~~

here is a section of the relevant code:

int rank, size;

MPI_Init(NULL, NULL);
MPI_Comm_size(MPI_COMM_WORLD, &size);
MPI_Comm_rank(MPI_COMM_WORLD, &rank);

std::array<int, size> gatheredRanks2;

If I simply set the value of this size to a number the program works.
Is there a workaround for this?



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資料來源:Stackoverflow

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