static void unref(MPI_Info info);
void set(const char* key, const char* value) { map_[key] = value; }
int get(const char* key, int valuelen, char* value, int* flag) const;
static void unref(MPI_Info info);
void set(const char* key, const char* value) { map_[key] = value; }
int get(const char* key, int valuelen, char* value, int* flag) const;