AMDG On 11/29/2012 01:47 AM, Anton Daneyko wrote:

Hi, I have a two variables: boost::array my_boost_array_variable_1; boost::array my_boost_array_variable_2;

now I want to call a C function with the following signature: int MPI_Allreduce ( void *sendbuf, void *recvbuf, ...);

I want to pass the address of a particular element of my my_boost_array_variable_1 and my_boost_array_variable_2 as a first and second parameter of MPI_Allreduce: MPI_Allreduce(&my_boost_array_variable_1[2], &my_boost_array_variable_2[2], ...

Yes, this is legal. A pointer is a pointer, regardless of how you get it and all of the intermediate expressions are legal too.

or should I rather do: MPI_Allreduce(my_boost_array_variable_1.c_array() + 2, my_boost_array_variable_2.c_array() + 2, ...

In Christ, Steven Watanabe