32template<
class T,
class BinaryOp>
static int & msgType() noexcept
Message tag of standard messages.
void reduce()
Sum element counts across all processes.
virtual label comm() const =0
Return communicator used for parallel communication.
void reduce(const List< UPstream::commsStruct > &comms, T &value, const BinaryOp &bop, const int tag, const label comm)