1 files changed, 35 insertions, 0 deletions
diff --git a/src/Witness_complex/include/gudhi/Witness_complex/all_faces_in.h b/src/Witness_complex/include/gudhi/Witness_complex/all_faces_in.h
new file mode 100644
index 00000000..899022f8
--- /dev/null
+++ b/src/Witness_complex/include/gudhi/Witness_complex/all_faces_in.h
@@ -0,0 +1,35 @@
+#ifndef ALL_FACES_IN_H_
+#define ALL_FACES_IN_H_
+
+/* \brief Check if the facets of the k-dimensional simplex witnessed 
+ *  by witness witness_id are already in the complex.
+ *  inserted_vertex is the handle of the (k+1)-th vertex witnessed by witness_id
+ */
+template < typename SimplicialComplexForWitness,
+           typename Simplex >
+  bool all_faces_in(Simplex& simplex,
+                    double* filtration_value,
+                    SimplicialComplexForWitness& sc)
+  {
+    typedef typename SimplicialComplexForWitness::Simplex_handle Simplex_handle;
+
+    if (simplex.size() == 1)
+      return true;                  /* Add vertices unconditionally */
+    
+    Simplex facet;
+    for (typename Simplex::iterator not_it = simplex.begin(); not_it != simplex.end(); ++not_it)
+      {
+        facet.clear();
+        for (typename Simplex::iterator it = simplex.begin(); it != simplex.end(); ++it)
+          if (it != not_it)
+            facet.push_back(*it);
+        typename SimplicialComplexForWitness::Simplex_handle facet_sh = sc.find(facet);
+        if (facet_sh == sc.null_simplex())
+          return false;
+        else if (sc.filtration(facet_sh) > *filtration_value)
+          *filtration_value = sc.filtration(facet_sh);
+      }
+    return true;
+  }
+
+#endif