diff --git a/third-party/akantu_iterators/test/test_iterators.cc b/third-party/akantu_iterators/test/test_iterators.cc
index 360e6e6ff..3b19ca799 100644
--- a/third-party/akantu_iterators/test/test_iterators.cc
+++ b/third-party/akantu_iterators/test/test_iterators.cc
@@ -1,387 +1,374 @@
 /**
  * @file   test_zip_iterator.cc
  *
  * @author Nicolas Richart <nicolas.richart@epfl.ch>
  *
  * @date creation: Fri Jul 21 2017
  * @date last modification: Fri Dec 08 2017
  *
  * @brief  test the zip container and iterator
  *
  * @section LICENSE
  *
  * Copyright (©) 2016-2018 EPFL (Ecole Polytechnique Fédérale de Lausanne)
  * Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
  *
  * Akantu is free  software: you can redistribute it and/or  modify it under the
  * terms  of the  GNU Lesser  General Public  License as published by  the Free
  * Software Foundation, either version 3 of the License, or (at your option) any
  * later version.
  *
  * Akantu is  distributed in the  hope that it  will be useful, but  WITHOUT ANY
  * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
  * A PARTICULAR PURPOSE. See  the GNU  Lesser General  Public License  for more
  * details.
  *
  * You should  have received  a copy  of the GNU  Lesser General  Public License
  * along with Akantu. If not, see <http://www.gnu.org/licenses/>.
  *
  */
 
 /* -------------------------------------------------------------------------- */
 #include "aka_iterators.hh"
 /* -------------------------------------------------------------------------- */
 #include <gtest/gtest.h>
 #include <vector>
 /* -------------------------------------------------------------------------- */
 
 using namespace akantu;
 
 /* -------------------------------------------------------------------------- */
 
 // Non Trivial class that counts moves and copies
 template <class T> class A {
 public:
   A() = default;
   A(T a) : a(a){};
   A(const A & other)
       : a(other.a), copy_counter(other.copy_counter + 1),
         move_counter(other.move_counter) {}
   A & operator=(const A & other) {
     if (this != &other) {
       a = other.a;
       copy_counter = other.copy_counter + 1;
     }
     return *this;
   }
 
   A(A && other)
       : a(std::move(other.a)), copy_counter(std::move(other.copy_counter)),
         move_counter(std::move(other.move_counter) + 1) {}
 
   A & operator=(A && other) {
     if (this != &other) {
       a = std::move(other.a);
       copy_counter = std::move(other.copy_counter);
       move_counter = std::move(other.move_counter) + 1;
     }
     return *this;
   }
 
   A & operator*=(const T & b) {
     a *= b;
     return *this;
   }
 
   T a;
   size_t copy_counter{0};
   size_t move_counter{0};
 };
 
 template <typename T> struct C {
   struct iterator {
     using reference = A<T>;
     using difference_type = void;
     using iterator_category = std::input_iterator_tag;
     using value_type = A<T>;
     using pointer = A<T> *;
 
     iterator(T pos) : pos(std::move(pos)) {}
 
     A<T> operator*() { return A<int>(pos); }
     bool operator!=(const iterator & other) const { return pos != other.pos; }
     bool operator==(const iterator & other) const { return pos == other.pos; }
     iterator & operator++() {
       ++pos;
       return *this;
     }
     T pos;
   };
 
   C(T begin_, T end_) : begin_(std::move(begin_)), end_(std::move(end_)) {}
 
   iterator begin() { return iterator(begin_); }
   iterator end() { return iterator(end_); }
 
   T begin_, end_;
 };
 
 class TestZipFixutre : public ::testing::Test {
 protected:
   void SetUp() override {
     a.reserve(size);
     b.reserve(size);
 
     for (size_t i = 0; i < size; ++i) {
       a.emplace_back(i);
       b.emplace_back(i + size);
     }
   }
 
   template <typename A, typename B>
   void check(A && a, B && b, size_t pos, size_t nb_copy, size_t nb_move) {
     EXPECT_EQ(pos, a.a);
     EXPECT_EQ(nb_copy, a.copy_counter);
     EXPECT_EQ(nb_move, a.move_counter);
 
     EXPECT_FLOAT_EQ(pos + this->size, b.a);
     EXPECT_EQ(nb_copy, b.copy_counter);
     EXPECT_EQ(nb_move, b.move_counter);
   }
 
 protected:
   size_t size{20};
   std::vector<A<int>> a;
   std::vector<A<float>> b;
 };
 
 TEST_F(TestZipFixutre, SimpleTest) {
   size_t i = 0;
   for (auto && pair : zip(this->a, this->b)) {
     this->check(std::get<0>(pair), std::get<1>(pair), i, 0, 0);
     ++i;
   }
 }
 
 TEST_F(TestZipFixutre, ConstTest) {
   size_t i = 0;
   const auto & ca = this->a;
   const auto & cb = this->b;
   for (auto && pair : zip(ca, cb)) {
     this->check(std::get<0>(pair), std::get<1>(pair), i, 0, 0);
     EXPECT_EQ(true,
               std::is_const<
                   std::remove_reference_t<decltype(std::get<0>(pair))>>::value);
     EXPECT_EQ(true,
               std::is_const<
                   std::remove_reference_t<decltype(std::get<1>(pair))>>::value);
     ++i;
   }
 }
 
 TEST_F(TestZipFixutre, MixteTest) {
   size_t i = 0;
   const auto & cb = this->b;
   for (auto && pair : zip(a, cb)) {
     this->check(std::get<0>(pair), std::get<1>(pair), i, 0, 0);
     EXPECT_EQ(false,
               std::is_const<
                   std::remove_reference_t<decltype(std::get<0>(pair))>>::value);
     EXPECT_EQ(true,
               std::is_const<
                   std::remove_reference_t<decltype(std::get<1>(pair))>>::value);
     ++i;
   }
 }
 
 TEST_F(TestZipFixutre, MoveTest) {
   size_t i = 0;
   for (auto && pair :
        zip(C<int>(0, this->size), C<int>(this->size, 2 * this->size))) {
     this->check(std::get<0>(pair), std::get<1>(pair), i, 0, 1);
     ++i;
   }
 }
 
 TEST_F(TestZipFixutre, Bidirectional) {
   auto _zip = zip(a, b);
   auto begin = _zip.begin();
   auto end = _zip.end();
 
   auto it = begin;
   ++it;
   EXPECT_EQ(begin, --it);
 
   it = begin;
   EXPECT_EQ(begin, it++);
   EXPECT_EQ(begin, --it);
 
   auto it2 = it = begin;
   ++it; ++it2;
   EXPECT_EQ(it2, it--);
   EXPECT_EQ(begin, it);
 }
 
 TEST_F(TestZipFixutre, RandomAccess) {
   auto _zip = zip(a, b);
   auto begin = _zip.begin();
   auto end = _zip.end();
 
   auto && val5 = begin[5];
   this->check(std::get<0>(val5), std::get<1>(val5), 5, 0, 0);
 
   auto && val13 = begin[13];
   this->check(std::get<0>(val13), std::get<1>(val13), 13, 0, 0);
 
   EXPECT_EQ(end - begin, a.size());
   auto it = ++begin;
   EXPECT_EQ(begin + 1, ++it);
   EXPECT_EQ(begin, it - 1);
 }
 
 TEST_F(TestZipFixutre, Cat) {
   size_t i = 0;
   for (auto && data : make_zip_cat(zip(a, b), zip(a, b))) {
     this->check(std::get<0>(data), std::get<1>(data), i, 0, 0);
     this->check(std::get<2>(data), std::get<3>(data), i, 0, 0);
     ++i;
   }
 }
 
 /* -------------------------------------------------------------------------- */
 TEST(TestArangeIterator, Stop) {
   size_t ref_i = 0;
   for (auto i : arange(10)) {
     EXPECT_EQ(ref_i, i);
     ++ref_i;
   }
 }
 
 TEST(TestArangeIterator, StartStop) {
   size_t ref_i = 1;
   for (auto i : arange(1, 10)) {
     EXPECT_EQ(ref_i, i);
     ++ref_i;
   }
 }
 
 TEST(TestArangeIterator, StartStopStep) {
   size_t ref_i = 1;
   for (auto i : arange(1, 22, 2)) {
     EXPECT_EQ(ref_i, i);
     ref_i += 2;
   }
 }
 
 TEST(TestArangeIterator, StartStopStepZipped) {
   int ref_i1 = -1, ref_i2 = 1;
   for (auto && i : zip(arange(-1, -10, -1), arange(1, 18, 2))) {
     EXPECT_EQ(ref_i1, std::get<0>(i));
     EXPECT_EQ(ref_i2, std::get<1>(i));
     ref_i1 += -1;
     ref_i2 += 2;
   }
 }
 
 /* -------------------------------------------------------------------------- */
 TEST(TestEnumerateIterator, SimpleTest) {
   std::vector<int> a {0, 10, 20, 30, 40};
   std::vector<int> b {0, 2, 4, 6, 8};
   for (auto && data : enumerate(a, b)) {
     EXPECT_EQ(std::get<0>(data) * 10, std::get<1>(data));
     EXPECT_EQ(std::get<0>(data) * 2, std::get<2>(data));
   }
 }
 
 
 
 /* -------------------------------------------------------------------------- */
 TEST(TestTransformAdaptor, Keys) {
   std::map<std::string, int> map{
       {"1", 1}, {"2", 2}, {"3", 3}, {"3", 3}, {"4", 4}};
 
   char counter = '1';
   for (auto && key : make_keys_adaptor(map)) {
     EXPECT_EQ(counter, key[0]);
     ++counter;
   }
 }
 
 TEST(TestTransformAdaptor, Values) {
   std::map<std::string, int> map{
       {"1", 1}, {"2", 2}, {"3", 3}, {"3", 3}, {"4", 4}};
 
   int counter = 1;
   for (auto && value : make_values_adaptor(map)) {
     EXPECT_EQ(counter, value);
     ++counter;
   }
 }
 
 static int plus1(int value) { return value + 1; }
 
 struct Plus {
   Plus(int a) : a(a) {}
   int operator()(int b) { return a + b; }
 
 private:
   int a{0};
 };
 
 TEST(TestTransformAdaptor, Lambda) {
   auto && container = arange(10);
 
   for (auto && data :
        zip(container, make_transform_adaptor(container, [](auto && value) {
              return value + 1;
            }))) {
     EXPECT_EQ(std::get<0>(data) + 1, std::get<1>(data));
   }
 }
 
 TEST(TestTransformAdaptor, LambdaLambda) {
   std::map<std::string, int> map{
       {"1", 1}, {"2", 2}, {"3", 3}, {"3", 3}, {"4", 4}};
 
   int counter = 1;
   for (auto && data : make_transform_adaptor(
            make_values_adaptor(map), [](auto && value) { return value + 1; })) {
     EXPECT_EQ(counter + 1, data);
     ++counter;
   }
 
   auto && container = arange(10);
 
   for (auto && data :
        zip(container, make_transform_adaptor(container, [](auto && value) {
              return value + 1;
            }))) {
     EXPECT_EQ(std::get<0>(data) + 1, std::get<1>(data));
   }
 }
 
 TEST(TestTransformAdaptor, Function) {
   auto && container = arange(10);
 
   for (auto && data :
        zip(container, make_transform_adaptor(container, plus1))) {
     EXPECT_EQ(std::get<0>(data) + 1, std::get<1>(data));
   }
 }
 
 TEST(TestTransformAdaptor, Functor) {
   auto && container = arange(10);
 
   for (auto && data :
        zip(container, make_transform_adaptor(container, Plus(1)))) {
     EXPECT_EQ(std::get<0>(data) + 1, std::get<1>(data));
   }
 }
 
 /* -------------------------------------------------------------------------- */
 TEST(TestFilteredIterator, Simple) {
   std::vector<int> values{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
-  std::vector<int> filter{0, 2, 4, 10, 8, 6};
-  for (auto && data : zip(filter, make_filtered_adaptor(filter, values))) {
+  std::vector<int> filter_{0, 2, 4, 10, 8, 6};
+  for (auto && data : zip(filter_, filter(filter_, values))) {
     EXPECT_EQ(std::get<0>(data), std::get<1>(data));
   }
 }
 
-/* -------------------------------------------------------------------------- */
-TEST(TestFilteredIterator, Zip) {
-  std::vector<int> a{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
-  auto b = a;
-  std::vector<int> filter{0, 2, 4, 10, 8, 6};
-  for (auto && data : zip(filter, make_filtered_adaptor(filter, a, b))) {
-    EXPECT_EQ(std::get<0>(data), std::get<0>(std::get<1>(data)));
-    EXPECT_EQ(std::get<0>(data), std::get<1>(std::get<1>(data)));
-  }
-}
-
-
-
 /* -------------------------------------------------------------------------- */
 int main(int argc, char **argv) {
   ::testing::InitGoogleTest(&argc, argv);
   return RUN_ALL_TESTS();
 }