[SMPI] Added comment regard Datatype::keyvals

diff --git a/src/smpi/mpi/smpi_datatype.cpp b/src/smpi/mpi/smpi_datatype.cpp
index 7f5470a..5beb552 100644 (file)
--- a/src/smpi/mpi/smpi_datatype.cpp
+++ b/src/smpi/mpi/smpi_datatype.cpp
@@ -97,8 +97,8 @@ CREATE_MPI_DATATYPE(MPI_PTR, void*);
 namespace simgrid{
 namespace smpi{
 
 namespace simgrid{
 namespace smpi{
 

-std::unordered_map<int, smpi_key_elem> Datatype::keyvals_;
-int Datatype::keyval_id_=0;
+std::unordered_map<int, smpi_key_elem> Datatype::keyvals_; // required by the Keyval class implementation
+int Datatype::keyval_id_=0; // required by the Keyval class implementation

 
 Datatype::Datatype(int size,MPI_Aint lb, MPI_Aint ub, int flags) : name_(nullptr), size_(size), lb_(lb), ub_(ub), flags_(flags), refcount_(1){
 #if SIMGRID_HAVE_MC
 
 Datatype::Datatype(int size,MPI_Aint lb, MPI_Aint ub, int flags) : name_(nullptr), size_(size), lb_(lb), ub_(ub), flags_(flags), refcount_(1){
 #if SIMGRID_HAVE_MC