GetPeriodicVertices in new interface

libsrc/general/array.hpp

@@ -394,6 +394,12 @@ namespace netgen
       Swap (ownmem, a2.ownmem);
       return *this;
     }
+
+    T * Release()
+    {
+      ownmem = false;
+      return data;
+    }
     
   private:
 

libsrc/include/nginterface_v2.hpp

@@ -30,6 +30,21 @@ namespace netgen
     int nr;    // 0-based
   };
 
+  template <typename T>
+  class Ng_Buffer
+  {
+    size_t s;
+    T * data;
+  public:
+    Ng_Buffer (size_t as, T * adata)
+      : s(as), data(adata) { ; }
+    Ng_Buffer (Ng_Buffer && buffer)
+      : s(buffer.Size()), data(buffer.Release()) { ; }
+    ~Ng_Buffer () { delete [] data; }
+    size_t Size() const { return s; }
+    T * Release() { T * hd = data; data = nullptr; return hd; }
+  };
+  
   class Ng_Element
   {
 
@@ -285,6 +300,7 @@ namespace netgen
     int GetParentElement (int ei) const;
     int GetParentSElement (int ei) const;
 
+    Ng_Buffer<int[2]> GetPeriodicVertices(int idnr) const;
 
     // Find element of point, returns local coordinates
     template <int DIM>

libsrc/include/nginterface_v2_impl.hpp

@@ -297,5 +297,14 @@ template <> NGX_INLINE DLL_HEADER const Ng_Node<2> Ngx_Mesh :: GetNode<2> (int n
 }
 
 
+NGX_INLINE DLL_HEADER Ng_Buffer<int[2]> Ngx_Mesh :: GetPeriodicVertices(int idnr) const
+{
+  Array<INDEX_2> apairs;
+  mesh->GetIdentifications().GetPairs (idnr, apairs);
+  typedef int ti2[2];
+  return { apairs.Size(), (ti2*)(void*)apairs.Release() };
+}
+
+
 
 inline auto Ngx_Mesh :: GetTimeStamp() const { return mesh->GetTimeStamp(); }