GitSharp.Core.WorkDirCheckout.CheckoutOutIndexNoHead C# (CSharp) Method

        private void CheckoutOutIndexNoHead()
        {
            var visitor = new AbstractIndexTreeVisitor
                              {
                                  VisitEntry = (m, i, f) =>
                                                   {
                                                       if (m == null)
                                                       {
                                                           _index.remove(_root, f);
                                                           return;
                                                       }

                                                       bool needsCheckout = false;
                                                       if (i == null)
                                                       {
                                                           needsCheckout = true;
                                                       }
                                                       else if (i.ObjectId.Equals(m.Id))
                                                       {
                                                           if (i.IsModified(_root, true))
                                                           {
                                                               needsCheckout = true;
                                                           }
                                                       }
                                                       else
                                                       {
                                                           needsCheckout = true;
                                                       }

                                                       if (needsCheckout)
                                                       {
                                                           GitIndex.Entry newEntry = _index.addEntry(m);
                                                           _index.checkoutEntry(_root, newEntry);
                                                       }
                                                   }
                              };

            new IndexTreeWalker(_index, _merge, _root, visitor).Walk();
        }