On Tue, Jun 26, 2012 at 6:43 AM, Barrett, Brian W <[email protected]>wrote:

In MPI-2, we supported float, double, and long double as the underlying type for std::complex with MPI::COMPLEX, MPI::DOUBLE_COMPLEX, and MPI::LONG_DOUBLE_COMPLEX, respectively. That seems like a good middle ground...

It's not a middle ground, it's everything supported by the C++ standard.