CFSimpleIndexer.md

@@ -138,13 +138,14 @@ class MyCFArray : public hpg::CFArray {
 Finally, the values of `hpg::VisData<N>::m_cf_index` may be computed as in the following
 ```c++
   hpg::VisData<N> vis;
-  hpg::CellIndex cell_index;
   // initialize fields of cell_index using visibility metadata
-  cell_index.m_baseline_type = 0;
-  cell_index.m_time = /*... from visibility time */;
-  cell_index.m_w_plane = W_0;
-  cell_index.m_frequency = /*... from visibility frequency */;
-  cell_index.m_mueller = 0; // not significant, 0 is always valid
+  hpg::CellIndex cell_index(
+    0,       // baseline type
+    /*...*/, // time
+    W_0,     // w plane
+    /*...*/, // frequency
+    0        // mueller, not significant here, 0 is always valid
+  );
   auto [mueller, cube, group] = subset_indexer.cf_index(cell_index);
   vis.m_cf_index = {cube, group};
 ```
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