G'day all! I'm a C++ beginner so perhaps I'm missing something obvious, but this is some code I'm writing to loop through all the subgroups of a group.

            H5::Group shapes_g = file.openGroup("shapes");
            hsize_t total_shapes = shapes_g.getNumObjs();

            for (hsize_t i = 0; i < total_shapes; ++i) {
                std::string shapeName = shapes_g.getObjnameByIdx(i);
                H5::Group shapeGroup = shapes_g.openGroup(shapeName);
                // ... etc
            }

When profiling, I've found that shapes_g.getObjnameByIdx(i) is very slow and actually makes my execution time significantly higher (e.g. 5x). Is there a more efficient way to loop through subgroups? In some of the sample data I'm working with there are 60,000 subgroups.