etl/test/test_no_stl_algorithm.cpp

/******************************************************************************
The MIT License(MIT)

Embedded Template Library.
https://github.com/ETLCPP/etl
https://www.etlcpp.com

Copyright(c) 2018 jwellbelove

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******************************************************************************/

#include "UnitTest++.h"

#undef min
#undef max

#include "etl/stl/algorithm.h"
#include "etl/stl/alternate/algorithm.h"

#include <algorithm>
#include <vector>
#include <array>
#include <list>
#include <memory>

#include "no_stl_test_iterators.h"

namespace
{
  const size_t SIZE = 10;

  int dataEQ[SIZE] = { 1, 1, 3, 3, 5, 5, 7, 7, 9, 9 };
  std::list<int> dataEQL = { 1, 1, 3, 3, 5, 5, 7, 7, 9, 9 };

  int dataS[SIZE] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
  std::list<int> dataSL = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };

  int dataA[SIZE] = { 2, 1, 4, 3, 6, 5, 8, 7, 10, 9 };

  typedef std::vector<int> Vector;
  Vector dataV = { 2, 1, 4, 3, 6, 5, 8, 7, 10, 9 };

  typedef std::list<int> List;
  List dataL = { 2, 1, 4, 3, 6, 5, 8, 7, 10, 9 };

  int dataD1[SIZE] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
  int dataD2[SIZE] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };

  class Data
  {
  public:

    Data()
      : a(0),
        b(0)
    {
    }

    Data(int a, int b)
      : a(a),
        b(b)
    {
    }

    int a;
    int b;
  };

  Data dataD[10] = { Data(1, 2), Data(2, 1), Data(3, 4), Data(4, 3), Data(5, 6), Data(6, 5), Data(7, 8), Data(8, 7), Data(9, 10), Data(10, 9) };

  bool operator ==(const Data& lhs, const Data& rhs)
  {
    return (lhs.a == rhs.a) && (lhs.b == rhs.b);
  }

  struct StructDataPredicate
  {
    bool operator ()(const Data& lhs, const Data& rhs) const
    {
      return lhs.a < rhs.a;
    }
  };

  struct StructDataEquality
  {
    bool operator ()(const Data& lhs, const Data& rhs) const
    {
      return lhs.a == rhs.a;
    }
  };

//  std::ostream& operator << (std::ostream& os, const Data& data_)
//  {
//    os << data_.a << "," << data_.b;
//    return os;
//  }

  struct Greater : public etlstd::binary_function<int, int, bool>
  {
    bool operator()(int a, int b) const
    {
      return a > b;
    }
  };

  SUITE(test_no_stl_algorithm)
  {
    //*************************************************************************
    TEST(min)
    {
      int a = 1;
      int b = 2;

      CHECK_EQUAL((std::min(a, b)), (etlstd::min(a, b)));
      CHECK_EQUAL((std::min(b, a)), (etlstd::min(b, a)));
    }

    //*************************************************************************
    TEST(min_compare)
    {
      int a = 1;
      int b = 2;

      CHECK_EQUAL((std::min(a, b, Greater())), (etlstd::min(a, b, Greater())));
      CHECK_EQUAL((std::min(b, a, Greater())), (etlstd::min(b, a, Greater())));
    }

    //*************************************************************************
    TEST(max)
    {
      int a = 1;
      int b = 2;

      CHECK_EQUAL((std::max(a, b)), (etlstd::max(a, b)));
      CHECK_EQUAL((std::max(b, a)), (etlstd::max(b, a)));
    }

    //*************************************************************************
    TEST(max_compare)
    {
      int a = 1;
      int b = 2;

      CHECK_EQUAL((std::max(a, b, Greater())), (etlstd::max(a, b, Greater())));
      CHECK_EQUAL((std::max(b, a, Greater())), (etlstd::max(b, a, Greater())));
    }

    //*************************************************************************
    TEST(copy_pod_pointer)
    {
      int data1[10];
      int data2[10];

      int* pstl = std::copy(std::begin(dataA), std::end(dataA), std::begin(data1));
      int* petl = etlstd::copy(std::begin(dataA), std::end(dataA), std::begin(data2));

      using difference_type_t = std::iterator_traits<int*>::difference_type;

      difference_type_t dstl = std::distance(data1, pstl);
      difference_type_t detl = std::distance(data2, petl);

      CHECK_EQUAL(dstl, detl);

      bool isEqual = std::equal(std::begin(data1), std::end(data1), std::begin(data2));
      CHECK(isEqual);
    }

    //*************************************************************************
    TEST(copy_non_pod_pointer)
    {
      Data data1[10];
      Data data2[10];

      Data* pstl = std::copy(std::begin(dataD), std::end(dataD), std::begin(data1));
      Data* petl = etlstd::copy(std::begin(dataD), std::end(dataD), std::begin(data2));

      using difference_type_t = std::iterator_traits<Data*>::difference_type;

      difference_type_t dstl = std::distance(data1, pstl);
      difference_type_t detl = std::distance(data2, petl);

      CHECK_EQUAL(dstl, detl);

      bool isEqual = std::equal(std::begin(data1), std::end(data1), std::begin(data2));
      CHECK(isEqual);
    }

    //*************************************************************************
    TEST(copy_non_random_iterator)
    {
      List data1(dataL.size());
      List data2(dataL.size());

      List::iterator pstl = std::copy(std::begin(dataA), std::end(dataA), std::begin(data1));
      List::iterator petl = etlstd::copy(std::begin(dataA), std::end(dataA), std::begin(data2));

      using difference_type_t = List::difference_type;

      difference_type_t dstl = std::distance(data1.begin(), pstl);
      difference_type_t detl = std::distance(data2.begin(), petl);

      CHECK_EQUAL(dstl, detl);

      bool isEqual = std::equal(std::begin(data1), std::end(data1), std::begin(data2));
      CHECK(isEqual);
    }

    //*************************************************************************
    TEST(reverse_copy_pod_pointer)
    {
      int data1[10];
      int data2[10];

      int* pstl = std::reverse_copy(std::begin(dataA), std::end(dataA), std::begin(data1));
      int* petl = etlstd::reverse_copy(std::begin(dataA), std::end(dataA), std::begin(data2));

      using difference_type_t = std::iterator_traits<int*>::difference_type;

      difference_type_t dstl = std::distance(data1, pstl);
      difference_type_t detl = std::distance(data2, petl);

      CHECK_EQUAL(dstl, detl);

      bool isEqual = std::equal(std::begin(data1), std::end(data1), std::begin(data2));
      CHECK(isEqual);
    }

    //*************************************************************************
    TEST(copy_n_pod_pointer)
    {
      int data1[10];
      int data2[10];

      int* pstl = std::copy_n(std::begin(dataA), 10, std::begin(data1));
      int* petl = etlstd::copy_n(std::begin(dataA), 10, std::begin(data2));

      using difference_type_t = std::iterator_traits<int*>::difference_type;

      difference_type_t dstl = std::distance(data1, pstl);
      difference_type_t detl = std::distance(data2, petl);

      CHECK_EQUAL(dstl, detl);

      bool isEqual = std::equal(std::begin(data1), std::end(data1), std::begin(data2));
      CHECK(isEqual);
    }

    //*************************************************************************
    TEST(copy_n_non_pod_pointer)
    {
      Data data1[10];
      Data data2[10];

      Data* pstl = std::copy_n(std::begin(dataD), 10, std::begin(data1));
      Data* petl = etlstd::copy_n(std::begin(dataD), 10, std::begin(data2));

      using difference_type_t = std::iterator_traits<Data*>::difference_type;

      difference_type_t dstl = std::distance(data1, pstl);
      difference_type_t detl = std::distance(data2, petl);

      CHECK_EQUAL(dstl, detl);

      bool isEqual = std::equal(std::begin(data1), std::end(data1), std::begin(data2));
      CHECK(isEqual);
    }

    //*************************************************************************
    TEST(copy_n_non_random_iterator)
    {
      List data1(dataL.size());
      List data2(dataL.size());

      List::iterator pstl = std::copy_n(std::begin(dataA), 10, std::begin(data1));
      List::iterator petl = etlstd::copy_n(std::begin(dataA), 10, std::begin(data2));

      using difference_type_t = List::difference_type;

      difference_type_t dstl = std::distance(data1.begin(), pstl);
      difference_type_t detl = std::distance(data2.begin(), petl);

      CHECK_EQUAL(dstl, detl);

      bool isEqual = std::equal(std::begin(data1), std::end(data1), std::begin(data2));
      CHECK(isEqual);
    }

    //*************************************************************************
    TEST(copy_backward_pod_pointer)
    {
      int data1[10];
      int data2[10];

      int* pstl = std::copy_backward(std::begin(dataA), std::end(dataA), std::end(data1));
      int* petl = etlstd::copy_backward(std::begin(dataA), std::end(dataA), std::end(data2));

      using difference_type_t = std::iterator_traits<int*>::difference_type;

      difference_type_t dstl = std::distance(data1, pstl);
      difference_type_t detl = std::distance(data2, petl);

      CHECK_EQUAL(dstl, detl);

      bool isEqual = std::equal(std::begin(data1), std::end(data1), std::begin(data2));
      CHECK(isEqual);
    }

    //*************************************************************************
    TEST(copy_backward_non_pod_pointer)
    {
      Data data1[10];
      Data data2[10];

      Data* pstl = std::copy_backward(std::begin(dataD), std::end(dataD), std::end(data1));
      Data* petl = etlstd::copy_backward(std::begin(dataD), std::end(dataD), std::end(data2));

      using difference_type_t = std::iterator_traits<Data*>::difference_type;

      difference_type_t dstl = std::distance(data1, pstl);
      difference_type_t detl = std::distance(data2, petl);

      CHECK_EQUAL(dstl, detl);

      bool isEqual = std::equal(std::begin(data1), std::end(data1), std::begin(data2));
      CHECK(isEqual);
    }

    //*************************************************************************
    TEST(copy_backward_non_random_iterator)
    {
      List data1(dataL.size());
      List data2(dataL.size());

      List::iterator pstl = copy_backward(std::begin(dataA), std::end(dataA), std::end(data1));
      List::iterator petl = etlstd::copy_backward(std::begin(dataA), std::end(dataA), std::end(data2));

      using difference_type_t = std::iterator_traits<List::iterator>::difference_type;

      difference_type_t dstl = std::distance(data1.begin(), pstl);
      difference_type_t detl = std::distance(data2.begin(), petl);

      CHECK_EQUAL(dstl, detl);

      bool isEqual = std::equal(std::begin(data1), std::end(data1), std::begin(data2));
      CHECK(isEqual);
    }

    //*************************************************************************
    TEST(test_reverse_even_non_pointer)
    {
      std::array<int, 10> data1 = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
      std::array<int, 10> data2 = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };

      std::reverse(data1.begin(), data1.end());
      etlstd::reverse(data2.begin(), data2.end());

      bool isEqual = std::equal(data1.begin(), data1.end(), data2.begin());
      CHECK(isEqual);
    }

    //*************************************************************************
    TEST(test_reverse_odd_non_pointer)
    {
      std::array<int, 9> data1 = { 0, 1, 2, 3, 4, 5, 6, 7, 8 };
      std::array<int, 9> data2 = { 0, 1, 2, 3, 4, 5, 6, 7, 8 };

      std::reverse(data1.begin(), data1.end());
      etlstd::reverse(data2.begin(), data2.end());

      bool isEqual = std::equal(data1.begin(), data1.end(), data2.begin());
      CHECK(isEqual);
    }

    //*************************************************************************
    TEST(test_reverse_even_pointer)
    {
      int data1[10] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
      int data2[10] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };

      std::reverse(std::begin(data1), std::end(data1));
      etlstd::reverse(std::begin(data2), std::end(data2));

      bool isEqual = std::equal(std::begin(data1), std::end(data1), std::begin(data2));
      CHECK(isEqual);
    }

    //*************************************************************************
    TEST(test_reverse_odd_pointer)
    {
      int data1[9] = { 0, 1, 2, 3, 4, 5, 6, 7, 8 };
      int data2[9] = { 0, 1, 2, 3, 4, 5, 6, 7, 8 };

      std::reverse(std::begin(data1), std::end(data1));
      etlstd::reverse(std::begin(data2), std::end(data2));

      bool isEqual = std::equal(std::begin(data1), std::end(data1), std::begin(data2));
      CHECK(isEqual);
    }

    //*************************************************************************
    TEST(lower_bound_random_iterator)
    {
      for (int i = 0; i < 11; ++i)
      {
        int* lb1 = std::lower_bound(std::begin(dataS), std::end(dataS), i);
        int* lb2 = etlstd::lower_bound(random_iterator<int>(std::begin(dataS)), random_iterator<int>(std::end(dataS)), i);

        CHECK_EQUAL(lb1, lb2);
      }
    }

    //*************************************************************************
    TEST(lower_bound_non_random_iterator)
    {
      for (int i = 0; i < 11; ++i)
      {
        int* lb1 = std::lower_bound(std::begin(dataS), std::end(dataS), i);
        int* lb2 = etlstd::lower_bound(non_random_iterator<int>(std::begin(dataS)), non_random_iterator<int>(std::end(dataS)), i);

        CHECK_EQUAL(std::distance(std::begin(dataS), lb1), std::distance(std::begin(dataS), lb2));
      }
    }

    //*************************************************************************
    TEST(upper_bound_random_iterator)
    {
      for (int i = 0; i < 11; ++i)
      {
        int* lb1 = std::upper_bound(std::begin(dataS), std::end(dataS), i);
        int* lb2 = etlstd::upper_bound(random_iterator<int>(std::begin(dataS)), random_iterator<int>(std::end(dataS)), i);

        CHECK_EQUAL(std::distance(std::begin(dataS), lb1), std::distance(std::begin(dataS), lb2));
      }
    }

    //*************************************************************************
    TEST(upper_bound_non_random_iterator)
    {
      for (int i = 0; i < 11; ++i)
      {
        int* lb1 = std::upper_bound(std::begin(dataS), std::end(dataS), i);
        int* lb2 = etlstd::upper_bound(non_random_iterator<int>(std::begin(dataS)), non_random_iterator<int>(std::end(dataS)), i);

        CHECK_EQUAL(std::distance(std::begin(dataS), lb1), std::distance(std::begin(dataS), lb2));
      }
    }

    //*************************************************************************
    TEST(equal_range_random_iterator)
    {
      for (int i = 0; i < 11; ++i)
      {
        ETL_PAIR<int*, int*>    lb1 = std::equal_range(std::begin(dataEQ), std::end(dataEQ), i);
        ETL_PAIR<random_iterator<int>, random_iterator<int>> lb2 = etlstd::equal_range(random_iterator<int>(std::begin(dataEQ)), random_iterator<int>(std::end(dataEQ)), i);

        CHECK_EQUAL(std::distance(std::begin(dataEQ), lb1.first), std::distance<int*>(std::begin(dataEQ), lb2.first));
        CHECK_EQUAL(std::distance(lb1.first, lb1.second), std::distance<int*>(lb2.first, lb2.second));
      }
    }

    //*************************************************************************
    TEST(equal_range_non_random_iterator)
    {
      for (int i = 0; i < 11; ++i)
      {
        ETL_PAIR<int*, int*>    lb1 = std::equal_range(std::begin(dataEQ), std::end(dataEQ), i);
        ETL_PAIR<non_random_iterator<int>, non_random_iterator<int>> lb2 = etlstd::equal_range(non_random_iterator<int>(std::begin(dataEQ)), non_random_iterator<int>(std::end(dataEQ)), i);

        CHECK_EQUAL(std::distance(std::begin(dataEQ), lb1.first), std::distance<int*>(std::begin(dataEQ), lb2.first));
        CHECK_EQUAL(std::distance(lb1.first, lb1.second), std::distance<int*>(lb2.first, lb2.second));
      }
    }

    //*************************************************************************
    TEST(fill_non_char)
    {
      int data1[10];
      int data2[10];

      std::fill(std::begin(data1), std::end(data1), 0x12345678);
      etlstd::fill(std::begin(data2), std::end(data2), 0x12345678);

      bool isEqual = std::equal(std::begin(data1), std::end(data1), std::begin(data2));
      CHECK(isEqual);
    }

    //*************************************************************************
    TEST(fill_char)
    {
      unsigned char data1[10];
      unsigned char data2[10];

      std::fill(std::begin(data1), std::end(data1), char(0x12));
      etlstd::fill(std::begin(data2), std::end(data2), char(0x12));

      bool isEqual = std::equal(std::begin(data1), std::end(data1), std::begin(data2));
      CHECK(isEqual);
    }

    //*************************************************************************
    TEST(swap)
    {
      int a = 1;
      int b = 2;

      etlstd::swap(a, b);
      CHECK_EQUAL(2, a);
      CHECK_EQUAL(1, b);
    }

    //*************************************************************************
    TEST(iter_swap)
    {
      int a = 1;
      int b = 2;

      etlstd::iter_swap(&a, &b);
      CHECK_EQUAL(2, a);
      CHECK_EQUAL(1, b);
    }

    //*************************************************************************
    TEST(equal)
    {
      CHECK(etlstd::equal(std::begin(dataV), std::end(dataV), std::begin(dataL)));
      CHECK(!etlstd::equal(std::begin(dataSL), std::end(dataSL), std::begin(dataL)));
    }

    //*************************************************************************
    TEST(lexicographical_compare)
    {
      std::string text1("Hello World");
      std::string text2("Hello Xorld");

      bool t1 = std::lexicographical_compare(text1.begin(), text1.end(), text2.begin(), text2.begin() + 7);
      bool t2 = etlstd::lexicographical_compare(text1.begin(), text1.end(), text2.begin(), text2.begin() + 7);

      CHECK(t1 == t2);
    }

    //*************************************************************************
    TEST(lexicographical_compare_greater)
    {
      std::string text1("Hello World");
      std::string text2("Hello Xorld");

      bool t1 = std::lexicographical_compare(text1.begin(), text1.end(), text2.begin(), text2.begin() + 7, Greater());
      bool t2 = etlstd::lexicographical_compare(text1.begin(), text1.end(), text2.begin(), text2.begin() + 7, Greater());

      CHECK(t1 == t2);
    }

    //*************************************************************************
    TEST(search)
    {
      std::string haystack = "ABCDFEGHIJKLMNOPQRSTUVWXYZ";
      std::string needle   = "KLMNO";

      std::string::iterator itr1 = std::search(haystack.begin(), haystack.end(), needle.begin(), needle.begin());
      std::string::iterator itr2 = etlstd::search(haystack.begin(), haystack.end(), needle.begin(), needle.begin());

      CHECK(itr1 == itr2);
    }

    //*************************************************************************
    TEST(search_predicate)
    {
      std::string haystack = "ABCDFEGHIJKLMNOPQRSTUVWXYZ";
      std::string needle   = "KLMNO";

      std::string::iterator itr1 = std::search(haystack.begin(), haystack.end(), needle.begin(), needle.begin(), std::equal_to<char>());
      std::string::iterator itr2 = etlstd::search(haystack.begin(), haystack.end(), needle.begin(), needle.begin(), std::equal_to<char>());

      CHECK(itr1 == itr2);
    }

    //*************************************************************************
    TEST(heap)
    {
      Vector data1 = dataV;
      Vector data2 = dataV;

      std::make_heap(data1.begin(), data1.end());
      etlstd::make_heap(data2.begin(), data2.end());

      bool isEqual;

      CHECK(std::is_heap(data2.begin(), data2.end()));

      isEqual = std::equal(std::begin(data1), std::end(data1), std::begin(data2));
      CHECK(isEqual);

      std::pop_heap(data1.begin(), data1.end());
      etlstd::pop_heap(data2.begin(), data2.end());

      data1.pop_back();
      data2.pop_back();

      CHECK(std::is_heap(data1.begin(), data1.end()));
      CHECK(std::is_heap(data2.begin(), data2.end()));

      isEqual = std::equal(std::begin(data1), std::end(data1), std::begin(data2));
      CHECK(isEqual);

      CHECK(std::is_heap(data2.begin(), data2.end()));

      isEqual = std::equal(std::begin(data1), std::end(data1), std::begin(data2));
      CHECK(isEqual);

      data1.push_back(5);
      data2.push_back(5);

      std::push_heap(data1.begin(), data1.end());
      etlstd::push_heap(data2.begin(), data2.end());

      CHECK(std::is_heap(data2.begin(), data2.end()));

      isEqual = std::equal(std::begin(data1), std::end(data1), std::begin(data2));
      CHECK(isEqual);
    }

    //*************************************************************************
    TEST(heap_greater)
    {
      Vector data1 = dataV;
      Vector data2 = dataV;

      std::make_heap(data1.begin(), data1.end(), Greater());
      etlstd::make_heap(data2.begin(), data2.end(), Greater());

      bool isEqual;

      CHECK(std::is_heap(data2.begin(), data2.end(), Greater()));

      isEqual = std::equal(std::begin(data1), std::end(data1), std::begin(data2));
      CHECK(isEqual);

      std::pop_heap(data1.begin(), data1.end(), Greater());
      etlstd::pop_heap(data2.begin(), data2.end(), Greater());

      data1.pop_back();
      data2.pop_back();

      CHECK(std::is_heap(data1.begin(), data1.end(), Greater()));
      CHECK(std::is_heap(data2.begin(), data2.end(), Greater()));

      isEqual = std::equal(std::begin(data1), std::end(data1), std::begin(data2));
      CHECK(isEqual);

      CHECK(std::is_heap(data2.begin(), data2.end(), Greater()));

      isEqual = std::equal(std::begin(data1), std::end(data1), std::begin(data2));
      CHECK(isEqual);

      data1.push_back(5);
      data2.push_back(5);

      std::push_heap(data1.begin(), data1.end(), Greater());
      etlstd::push_heap(data2.begin(), data2.end(), Greater());

      CHECK(std::is_heap(data2.begin(), data2.end(), Greater()));

      isEqual = std::equal(std::begin(data1), std::end(data1), std::begin(data2));
      CHECK(isEqual);
    }

    //*************************************************************************
    TEST(find)
    {
      int* itr1 = std::find(std::begin(dataA), std::end(dataA), 5);
      int* itr2 = etlstd::find(std::begin(dataA), std::end(dataA), 5);

      CHECK(itr1 == itr2);
    }

    //*************************************************************************
    TEST(find_if)
    {
      struct predicate
      {
        bool operator()(int i) const
        {
          return (i == 5);
        }
      };

      int* itr1 = std::find_if(std::begin(dataA), std::end(dataA), predicate());
      int* itr2 = etlstd::find_if(std::begin(dataA), std::end(dataA), predicate());

      CHECK(itr1 == itr2);
    }

    //*************************************************************************
    TEST(count)
    {
      size_t c1 = std::count(std::begin(dataEQ), std::end(dataEQ), 5);
      size_t c2 = etlstd::count(std::begin(dataEQ), std::end(dataEQ), 5);

      CHECK(c1 == c2);
    }

    //*************************************************************************
    TEST(count_if)
    {
      struct predicate
      {
        bool operator()(int i) const
        {
          return (i == 5);
        }
      };

      size_t c1 = std::count_if(std::begin(dataEQ), std::end(dataEQ), predicate());
      size_t c2 = etlstd::count_if(std::begin(dataEQ), std::end(dataEQ), predicate());

      CHECK(c1 == c2);
    }

    //*************************************************************************
    TEST(fill_n)
    {
      int* p1 = std::fill_n(std::begin(dataD1), SIZE, 5);
      int* p2 = etlstd::fill_n(std::begin(dataD2), SIZE, 5);

      CHECK(p2 == std::end(dataD2));

      bool isEqual = std::equal(std::begin(dataD1), std::end(dataD1), std::begin(dataD2));
      CHECK(isEqual);
    }

    //*************************************************************************
    TEST(transform1)
    {
      struct Function
      {
        int operator()(int d) const
        {
          return d * 2;
        }
      };

      int* p1 = std::transform(std::begin(dataS), std::end(dataS), std::begin(dataD1), Function());
      int* p2 = etlstd::transform(std::begin(dataS), std::end(dataS), std::begin(dataD2), Function());

      CHECK(p2 == std::end(dataD2));

      bool isEqual = std::equal(std::begin(dataD1), std::end(dataD1), std::begin(dataD2));
      CHECK(isEqual);
    }

    //*************************************************************************
    TEST(transform2)
    {
      struct Function
      {
        int operator()(int d1, int d2) const
        {
          return d1 + d2;
        }
      };

      int* p1 = std::transform(std::begin(dataS), std::end(dataS), std::begin(dataA), std::begin(dataD1), Function());
      int* p2 = etlstd::transform(std::begin(dataS), std::end(dataS), std::begin(dataA), std::begin(dataD2), Function());

      CHECK(p2 == std::end(dataD2));

      bool isEqual = std::equal(std::begin(dataD1), std::end(dataD1), std::begin(dataD2));
      CHECK(isEqual);
    }

    //*************************************************************************
    TEST(move)
    {
      typedef std::vector<std::unique_ptr<unsigned>> Data;

      Data data1;

      // Create some data.
      std::unique_ptr<uint32_t> p1(new uint32_t(1U));
      std::unique_ptr<uint32_t> p2(new uint32_t(2U));
      std::unique_ptr<uint32_t> p3(new uint32_t(3U));
      std::unique_ptr<uint32_t> p4(new uint32_t(4U));
      std::unique_ptr<uint32_t> p5(new uint32_t(5U));

      // Fill data1.
      data1.push_back(std::move(p1));
      data1.push_back(std::move(p2));
      data1.push_back(std::move(p3));
      data1.push_back(std::move(p4));
      data1.push_back(std::move(p5));

      Data data2;

      // Move to data2.
      etlstd::move(data1.begin(), data1.end(), std::back_inserter(data2));

      // Old data now empty.
      CHECK(!bool(p1));
      CHECK(!bool(p2));
      CHECK(!bool(p3));
      CHECK(!bool(p4));
      CHECK(!bool(p5));

      CHECK_EQUAL(1U, *(data2[0]));
      CHECK_EQUAL(2U, *(data2[1]));
      CHECK_EQUAL(3U, *(data2[2]));
      CHECK_EQUAL(4U, *(data2[3]));
      CHECK_EQUAL(5U, *(data2[4]));
    }

    //*************************************************************************
    TEST(move_backward)
    {
      typedef std::vector<std::unique_ptr<unsigned>> Data;

      Data data1;

      // Create some data.
      std::unique_ptr<uint32_t> p1(new uint32_t(1U));
      std::unique_ptr<uint32_t> p2(new uint32_t(2U));
      std::unique_ptr<uint32_t> p3(new uint32_t(3U));
      std::unique_ptr<uint32_t> p4(new uint32_t(4U));
      std::unique_ptr<uint32_t> p5(new uint32_t(5U));

      // Fill data1.
      data1.push_back(std::move(p1));
      data1.push_back(std::move(p2));
      data1.push_back(std::move(p3));
      data1.push_back(std::move(p4));
      data1.push_back(std::move(p5));

      Data data2;

      // Create some data.
      std::unique_ptr<uint32_t> p6(new uint32_t(6U));
      std::unique_ptr<uint32_t> p7(new uint32_t(7U));
      std::unique_ptr<uint32_t> p8(new uint32_t(8U));
      std::unique_ptr<uint32_t> p9(new uint32_t(9U));
      std::unique_ptr<uint32_t> p10(new uint32_t(10U));

      // Fill data2.
      data2.push_back(std::move(p6));
      data2.push_back(std::move(p7));
      data2.push_back(std::move(p8));
      data2.push_back(std::move(p9));
      data2.push_back(std::move(p10));

      // Overwrite data2 with data1.
      etlstd::move_backward(data1.begin(), data1.end(), data2.end());

      // Old data now empty.
      CHECK(!bool(p1));
      CHECK(!bool(p2));
      CHECK(!bool(p3));
      CHECK(!bool(p4));
      CHECK(!bool(p5));

      CHECK_EQUAL(1U, *(data2[0]));
      CHECK_EQUAL(2U, *(data2[1]));
      CHECK_EQUAL(3U, *(data2[2]));
      CHECK_EQUAL(4U, *(data2[3]));
      CHECK_EQUAL(5U, *(data2[4]));
    }

    //*************************************************************************
    TEST(rotate)
    {
      std::vector<int> initial_data = { 1, 2, 3, 4, 5, 6, 7 };

      for (size_t i = 0; i < initial_data.size(); ++i)
      {
        std::vector data1(initial_data);
        std::vector data2(initial_data);

        std::rotate(data1.data(), data1.data() + i, data1.data() + data1.size());
        etlstd::rotate(data2.data(), data2.data() + i, data2.data() + data2.size());

        bool isEqual = std::equal(std::begin(data1), std::end(data1), std::begin(data2));
        CHECK(isEqual);
      }
    }
  };
}