etl/test/test_flat_multiset.cpp

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

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

Copyright(c) 2015 John Wellbelove

Permission is hereby granted, free of charge, to any person obtaining a copy
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******************************************************************************/

#include "unit_test_framework.h"

#include <set>
#include <array>
#include <algorithm>
#include <utility>
#include <iterator>
#include <string>
#include <vector>

#include "data.h"

#include "etl/flat_multiset.h"

namespace
{
  static const size_t SIZE = 10UL;

  typedef TestDataDC<std::string>  DC;
  typedef TestDataNDC<std::string> NDC;
  typedef TestDataM<std::string>   MC;

  typedef etl::flat_multiset<DC, SIZE>  DataDC;
  typedef etl::flat_multiset<NDC, SIZE> DataNDC;
  typedef etl::iflat_multiset<NDC>      IDataNDC;

  typedef etl::flat_multiset<int, SIZE> DataInt;

  typedef etl::flat_multiset<MC, SIZE>  DataM;
  typedef etl::iflat_multiset<MC>       IDataM;

  typedef std::multiset<DC>  Compare_DataDC;
  typedef std::multiset<NDC> Compare_DataNDC;

  struct D1
  {
    D1()
      : a("a")
    {
    }

    D1(const std::string& a_)
      : a(a_)
    {
    }

    std::string a;
  };

  struct D2
  {
    D2()
      : a("a")
      , b("b")
    {
    }

    D2(const std::string& a_, const std::string& b_)
      : a(a_)
      , b(b_)
    {
    }

    std::string a;
    std::string b;
  };

  struct D3
  {
    D3()
      : a("a")
      , b("b")
      , c("c")
    {
    }

    D3(const std::string& a_, const std::string& b_, const std::string& c_)
      : a(a_)
      , b(b_)
      , c(c_)
    {
    }

    std::string a;
    std::string b;
    std::string c;
  };

  struct D4
  {
    D4()
      : a("a")
      , b("b")
      , c("c")
      , d("d")
    {
    }

    D4(const std::string& a_, const std::string& b_, const std::string& c_, const std::string& d_)
      : a(a_)
      , b(b_)
      , c(c_)
      , d(d_)
    {
    }

    std::string a;
    std::string b;
    std::string c;
    std::string d;
  };

  bool operator == (const D1& lhs, const D1& rhs)
  {
    return (lhs.a == rhs.a);
  }

  bool operator == (const D2& lhs, const D2& rhs)
  {
    return (lhs.a == rhs.a) && (lhs.b == rhs.b);
  }

  bool operator == (const D3& lhs, const D3& rhs)
  {
    return (lhs.a == rhs.a) && (lhs.b == rhs.b) && (lhs.c == rhs.c);
  }

  bool operator == (const D4& lhs, const D4& rhs)
  {
    return (lhs.a == rhs.a) && (lhs.b == rhs.b) && (lhs.c == rhs.c) && (lhs.d == rhs.d);
  }

  bool operator < (const D1& lhs, const D1& rhs)
  {
    return (lhs.a < rhs.a);
  }

  bool operator < (const D2& lhs, const D2& rhs)
  {
    return (lhs.a < rhs.a) && (lhs.b < rhs.b);
  }

  bool operator < (const D3& lhs, const D3& rhs)
  {
    return (lhs.a < rhs.a) && (lhs.b < rhs.b) && (lhs.c < rhs.c);
  }

  bool operator < (const D4& lhs, const D4& rhs)
  {
    return (lhs.a < rhs.a) && (lhs.b < rhs.b) && (lhs.c < rhs.c) && (lhs.d < rhs.d);
  }

  typedef etl::flat_multiset<D1, SIZE> Data1;
  typedef etl::flat_multiset<D2, SIZE> Data2;
  typedef etl::flat_multiset<D3, SIZE> Data3;
  typedef etl::flat_multiset<D4, SIZE> Data4;

  typedef std::multiset<D1> Compare1;
  typedef std::multiset<D2> Compare2;
  typedef std::multiset<D3> Compare3;
  typedef std::multiset<D4> Compare4;

  struct Key
  {
    Key(const NDC& k_)
      : k(k_)
    {
    }

    NDC k;
  };

  bool operator <(const Key& lhs, const NDC& rhs)
  {
    return (lhs.k.value < rhs.value);
  }

  bool operator <(const NDC& lhs, const Key& rhs)
  {
    return (lhs.value < rhs.k.value);
  }

  SUITE(test_flat_multiset)
  {
    NDC NX = NDC("@");
    NDC NY = NDC("[");

    NDC N0 = NDC("A");
    NDC N1 = NDC("B");
    NDC N2 = NDC("C");
    NDC N3 = NDC("D");
    NDC N4 = NDC("E");
    NDC N5 = NDC("F");
    NDC N6 = NDC("G");
    NDC N7 = NDC("H");
    NDC N8 = NDC("I");
    NDC N9 = NDC("J");
    NDC N10 = NDC("K");
    NDC N11 = NDC("L");
    NDC N12 = NDC("M");
    NDC N13 = NDC("N");
    NDC N14 = NDC("O");
    NDC N15 = NDC("P");
    NDC N16 = NDC("Q");
    NDC N17 = NDC("R");
    NDC N18 = NDC("S");
    NDC N19 = NDC("T");

    std::vector<NDC> initial_data;
    std::vector<NDC> excess_data;
    std::vector<NDC> different_data;
    std::vector<NDC> multi_data;

    std::vector<int> int_data;

    //*************************************************************************
    struct SetupFixture
    {
      SetupFixture()
      {
        NDC n[] =
        {
          N0, N1, N2, N3, N4, N5, N6, N7, N8, N9
        };

        NDC n2[] =
        {
          N0, N1, N2, N3, N4, N5, N6, N7, N8, N9, N10
        };

        NDC n3[] =
        {
          N10, N11, N12, N13, N14, N15, N16, N17, N18, N19
        };

        NDC n4[] =
        {
          N0, N0, N1, N2, N3, N1, N3, N3, N4, N2
        };

        int n5[] =
        {
          10, 11, 12, 13, 14, 15, 16, 17, 18, 19
        };

        initial_data.assign(std::begin(n), std::end(n));
        excess_data.assign(std::begin(n2), std::end(n2));
        different_data.assign(std::begin(n3), std::end(n3));
        multi_data.assign(std::begin(n4), std::end(n4));
        int_data.assign(std::begin(n5), std::end(n5));
      }
    };

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_default_constructor)
    {
      DataDC data;

      CHECK_EQUAL(data.size(), size_t(0UL));
      CHECK(data.empty());
      CHECK_EQUAL(data.capacity(), SIZE);
      CHECK_EQUAL(data.max_size(), SIZE);
      CHECK(data.begin() == data.end());
    }

#if ETL_USING_CPP17 && ETL_HAS_INITIALIZER_LIST && !defined(ETL_TEMPLATE_DEDUCTION_GUIDE_TESTS_DISABLED)
    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_cpp17_deduced_constructor)
    {
      etl::flat_multiset data{ N0, N1, N2, N3, N4, N5, N6, N7, N8, N9 };
      etl::flat_multiset<NDC, 10U> check = { N0, N1, N2, N3, N4, N5, N6, N7, N8, N9 };

      CHECK(!data.empty());
      CHECK(data.full());
      CHECK(data.begin() != data.end());
      CHECK_EQUAL(10U, data.size());
      CHECK_EQUAL(0U, data.available());
      CHECK_EQUAL(10U, data.capacity());
      CHECK_EQUAL(10U, data.max_size());
      CHECK(data == check);
    }
#endif

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_destruct_via_iflat_multiset)
    {
      int current_count = NDC::get_instance_count();

      DataNDC* pdata = new DataNDC(initial_data.begin(), initial_data.end());
      CHECK_EQUAL(int(current_count + initial_data.size()), NDC::get_instance_count());

      IDataNDC* pidata = pdata;
      delete pidata;
      CHECK_EQUAL(current_count, NDC::get_instance_count());
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_constructor_range)
    {
      Compare_DataNDC compare_data(initial_data.begin(), initial_data.end());

      DataNDC data(compare_data.begin(), compare_data.end());

      CHECK(data.size() == SIZE);
      CHECK(!data.empty());
    }

#if ETL_HAS_INITIALIZER_LIST
    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_constructor_initializer_list)
    {
      Compare_DataNDC compare_data = { N0, N0, N1, N2, N3, N1, N3, N3, N4, N2 };

      DataNDC data = { N0, N0, N1, N2, N3, N1, N3, N3, N4, N2 };

      CHECK_EQUAL(compare_data.size(), data.size());
      CHECK(!data.empty());

      bool isEqual = std::equal(data.begin(),
                                data.end(),
                                compare_data.begin());
      CHECK(isEqual);
    }
#endif

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_move_constructor)
    {
      using Item = MC;

      Item p1(Item("1"));
      Item p2a("2a");
      Item p2b("2b");
      Item p3("3");
      Item p4(Item("4"));

      DataM data1;
      data1.insert(std::move(p1));
      data1.insert(std::move(p2a));
      data1.insert(std::move(p3));
      data1.insert(std::move(p4));
      data1.insert(std::move(p2b));

      CHECK(!bool(p1));
      CHECK(!bool(p2a));
      CHECK(!bool(p2b));
      CHECK(!bool(p3));
      CHECK(!bool(p4));

      DataM data2(std::move(data1));

      CHECK_EQUAL(5U, data1.size());  // Move does not clear the source.
      CHECK_EQUAL(5U, data2.size());

      DataM::iterator itr = data2.begin();

      Item pr = std::move(*itr++);

      CHECK_EQUAL("1", pr.value);
      CHECK_EQUAL("2a", (*itr++).value);
      CHECK_EQUAL("2b", (*itr++).value);
      CHECK_EQUAL("3", (*itr++).value);
      CHECK_EQUAL("4", (*itr++).value);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_assignment)
    {
      DataNDC data(initial_data.begin(), initial_data.end());
      DataNDC other_data;

      other_data = data;

      bool isEqual = std::equal(data.begin(),
                                 data.end(),
                                 other_data.begin());

      CHECK(isEqual);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_assignment_interface)
    {
      DataNDC data1(initial_data.begin(), initial_data.end());
      DataNDC data2;

      IDataNDC& idata1 = data1;
      IDataNDC& idata2 = data2;

      idata2 = idata1;

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

      CHECK(isEqual);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_self_assignment)
    {
      DataNDC data(initial_data.begin(), initial_data.end());
      DataNDC other_data(data);

#include "etl/private/diagnostic_self_assign_overloaded_push.h" 
      other_data = other_data;
#include "etl/private/diagnostic_pop.h" 

      bool isEqual = std::equal(data.begin(),
                                 data.end(),
                                 other_data.begin());

      CHECK(isEqual);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_begin)
    {
      DataNDC data(initial_data.begin(), initial_data.end());
      const DataNDC constData(data);

      CHECK(data.begin() == std::begin(data));
      CHECK(constData.begin() == std::begin(constData));
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_end)
    {
      DataNDC data(initial_data.begin(), initial_data.end());
      const DataNDC constData(data);

      CHECK(data.end() == std::end(data));
      CHECK(constData.end() == std::end(constData));
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_empty)
    {
      DataNDC data;
      data.insert(initial_data.begin(), initial_data.end());

      CHECK(data.full());
      CHECK(!data.empty());
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_full)
    {
      DataNDC data;

      CHECK(!data.full());
      CHECK(data.empty());
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_assign_range)
    {
      Compare_DataNDC compare_data(initial_data.begin(), initial_data.end());

      DataNDC data;

      data.assign(compare_data.begin(), compare_data.end());

      bool isEqual = std::equal(data.begin(),
                                 data.end(),
                                 compare_data.begin());

      CHECK(isEqual);

      CHECK(std::is_sorted(data.begin(), data.end()));
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_insert_value)
    {
      Compare_DataNDC compare_data;
      DataNDC data;

      data.insert(N0);
      compare_data.insert(N0);

      bool isEqual = std::equal(data.begin(),
                                 data.end(),
                                 compare_data.begin());

      CHECK(isEqual);

      data.insert(N2);
      compare_data.insert(N2);

      isEqual = std::equal(data.begin(),
                            data.end(),
                            compare_data.begin());

      CHECK(isEqual);

      data.insert(N1);
      compare_data.insert(N1);

      isEqual = std::equal(data.begin(),
                            data.end(),
                            compare_data.begin());

      CHECK(isEqual);

      CHECK(std::is_sorted(data.begin(), data.end()));
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_insert_value_multiple)
    {
      Compare_DataNDC compare_data;
      DataNDC data;

      data.insert(N0);
      compare_data.insert(N0);

      data.insert(N1);
      compare_data.insert(N1);

      data.insert(N2);
      compare_data.insert(N2);

      // Do it again.
      data.insert(N0);
      compare_data.insert(N0);

      data.insert(N1);
      compare_data.insert(N1);

      data.insert(N2);
      compare_data.insert(N2);

      CHECK_EQUAL(compare_data.size(), data.size());

      bool isEqual = std::equal(data.begin(),
                                data.end(),
                                compare_data.begin());

      CHECK(isEqual);

      CHECK(std::is_sorted(data.begin(), data.end()));
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_insert_value_excess)
    {
      DataNDC data(initial_data.begin(), initial_data.end());

      CHECK_THROW(data.insert(N10), etl::flat_multiset_full);

      CHECK(std::is_sorted(data.begin(), data.end()));
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_insert_range)
    {
      Compare_DataNDC compare_data;
      DataNDC data;

      data.insert(initial_data.begin(), initial_data.end());
      compare_data.insert(initial_data.begin(), initial_data.end());

      bool isEqual = std::equal(data.begin(),
                                 data.end(),
                                 compare_data.begin());

      CHECK(isEqual);

      CHECK(std::is_sorted(data.begin(), data.end()));
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_insert_range_excess)
    {
      DataNDC data;

      CHECK_THROW(data.insert(excess_data.begin(), excess_data.end()), etl::flat_multiset_full);

      CHECK(std::is_sorted(data.begin(), data.end()));
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_emplace_default_value)
    {
      Compare1 compare;
      Data1 data;

      data.emplace();
      compare.emplace();

      data.emplace();
      compare.emplace();

      data.emplace();
      compare.emplace();

      // Do it again.
      data.emplace();
      compare.emplace();

      data.emplace();
      compare.emplace();

      data.emplace();
      compare.emplace();

      CHECK_EQUAL(compare.size(), data.size());

      bool isEqual = std::equal(data.begin(), data.end(), compare.begin());
      CHECK(isEqual);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_emplace_value1)
    {
      Compare1 compare;
      Data1 data;

      data.emplace("0");
      compare.emplace("0");

      data.emplace("1");
      compare.emplace("1");

      data.emplace("2");
      compare.emplace("2");

      // Do it again.
      data.emplace("0");
      compare.emplace("0");

      data.emplace("1");
      compare.emplace("1");

      data.emplace("2");
      compare.emplace("2");

      CHECK_EQUAL(compare.size(), data.size());

      bool isEqual = std::equal(data.begin(), data.end(), compare.begin());
      CHECK(isEqual);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_emplace_value2)
    {
      Compare2 compare;
      Data2 data;

      data.emplace("0", "1");
      compare.emplace("0", "1");

      data.emplace("1", "2");
      compare.emplace("1", "2");

      data.emplace("2", "3");
      compare.emplace("2", "3");

      // Do it again.
      data.emplace("0", "1");
      compare.emplace("0", "1");

      data.emplace("1", "2");
      compare.emplace("1", "2");

      data.emplace("2", "3");
      compare.emplace("2", "3");

      CHECK_EQUAL(compare.size(), data.size());

      bool isEqual = std::equal(data.begin(), data.end(), compare.begin());
      CHECK(isEqual);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_emplace_value3)
    {
      Compare3 compare;
      Data3 data;

      data.emplace("0", "1", "2");
      compare.emplace("0", "1", "2");

      data.emplace("1", "2", "3");
      compare.emplace("1", "2", "3");

      data.emplace("2", "3", "4");
      compare.emplace("2", "3", "4");

      // Do it again.
      data.emplace("0", "1", "2");
      compare.emplace("0", "1", "2");

      data.emplace("1", "2", "3");
      compare.emplace("1", "2", "3");

      data.emplace("2", "3", "4");
      compare.emplace("2", "3", "4");

      CHECK_EQUAL(compare.size(), data.size());

      bool isEqual = std::equal(data.begin(), data.end(), compare.begin());
      CHECK(isEqual);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_emplace_value4)
    {
      Compare4 compare;
      Data4 data;

      data.emplace("0", "1", "2", "3");
      compare.emplace("0", "1", "2", "3");

      data.emplace("1", "2", "3", "4");
      compare.emplace("1", "2", "3", "4");

      data.emplace("2", "3", "4", "5");
      compare.emplace("2", "3", "4", "5");

      // Do it again.
      data.emplace("0", "1", "2", "3");
      compare.emplace("0", "1", "2", "3");

      data.emplace("1", "2", "3", "4");
      compare.emplace("1", "2", "3", "4");

      data.emplace("2", "3", "4", "5");
      compare.emplace("2", "3", "4", "5");

      CHECK_EQUAL(compare.size(), data.size());

      bool isEqual = std::equal(data.begin(), data.end(), compare.begin());
      CHECK(isEqual);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_erase_key)
    {
      Compare_DataNDC compare_data(initial_data.begin(), initial_data.end());
      DataNDC data(initial_data.begin(), initial_data.end());

      size_t count_compare = compare_data.erase(N5);
      size_t count         = data.erase(N5);

      CHECK_EQUAL(count_compare, count);

      bool isEqual = std::equal(data.begin(),
                                 data.end(),
                                 compare_data.begin());

      CHECK(isEqual);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_erase_key_using_transparent_comparator)
    {
      using CSet = std::multiset<NDC>;
      CSet compare_data(initial_data.begin(), initial_data.end());

      using ESet = etl::flat_multiset<NDC, SIZE, etl::less<>>;
      ESet data(initial_data.begin(), initial_data.end());

      size_t count_compare = compare_data.erase(N5);
      size_t count = data.erase(Key(N5));

      CHECK_EQUAL(count_compare, count);

      bool isEqual = std::equal(data.begin(),
        data.end(),
        compare_data.begin());

      CHECK(isEqual);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_erase_single_iterator)
    {
      Compare_DataNDC compare_data(initial_data.begin(), initial_data.end());
      DataNDC data(initial_data.begin(), initial_data.end());

      Compare_DataNDC::iterator i_compare_begin = compare_data.begin();
      DataNDC::iterator         i_data_begin    = data.begin();

      Compare_DataNDC::iterator i_compare = i_compare_begin;
      DataNDC::iterator         i_data    = i_data_begin;

      Compare_DataNDC::iterator i_compare_expected = i_compare_begin;
      DataNDC::iterator         i_data_expected    = i_data_begin;

      std::advance(i_compare, 2);
      std::advance(i_data, 2);

      std::advance(i_compare_expected, 3);
      std::advance(i_data_expected, 3);

      NDC compare_expected = *i_compare_expected;
      NDC data_expected    = *i_data_expected;

      Compare_DataNDC::iterator i_compare_result = compare_data.erase(i_compare);
      DataNDC::iterator         i_data_result    = data.erase(i_data);

      CHECK(compare_expected == *i_compare_result);
      CHECK(data_expected    == *i_data_result);

      bool isEqual = std::equal(data.begin(),
                                data.end(),
                                compare_data.begin());

      CHECK(isEqual);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_erase_single_const_iterator)
    {
      Compare_DataNDC compare_data(initial_data.begin(), initial_data.end());
      DataNDC data(initial_data.begin(), initial_data.end());

      Compare_DataNDC::iterator i_compare_begin = compare_data.begin();
      DataNDC::iterator         i_data_begin    = data.begin();

      Compare_DataNDC::const_iterator i_compare = i_compare_begin;
      DataNDC::const_iterator         i_data    = i_data_begin;

      Compare_DataNDC::iterator i_compare_expected = i_compare_begin;
      DataNDC::iterator         i_data_expected    = i_data_begin;

      std::advance(i_compare, 2);
      std::advance(i_data, 2);

      std::advance(i_compare_expected, 3);
      std::advance(i_data_expected, 3);

      NDC compare_expected = *i_compare_expected;
      NDC data_expected    = *i_data_expected;

      Compare_DataNDC::iterator i_compare_result = compare_data.erase(i_compare);
      DataNDC::iterator         i_data_result    = data.erase(i_data);

      CHECK(compare_expected == *i_compare_result);
      CHECK(data_expected    == *i_data_result);

      bool isEqual = std::equal(data.begin(),
                                data.end(),
                                compare_data.begin());

      CHECK(isEqual);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_erase_range)
    {
      Compare_DataNDC compare_data(initial_data.begin(), initial_data.end());
      DataNDC data(initial_data.begin(), initial_data.end());

      Compare_DataNDC::const_iterator i_compare = compare_data.begin();
      DataNDC::const_iterator         i_data    = data.begin();

      Compare_DataNDC::const_iterator i_compare_end = compare_data.begin();
      DataNDC::const_iterator         i_data_end    = data.begin();

      std::advance(i_compare, 2);
      std::advance(i_data, 2);

      std::advance(i_compare_end, 4);
      std::advance(i_data_end, 4);

      NDC compare_expected = *i_compare_end;
      NDC data_expected    = *i_data_end;

      Compare_DataNDC::iterator i_compare_result = compare_data.erase(i_compare, i_compare_end);
      DataNDC::iterator         i_data_result    = data.erase(i_data, i_data_end);

      CHECK(compare_expected == *i_compare_result);
      CHECK(data_expected    == *i_data_result);

      bool isEqual = std::equal(data.begin(),
                                data.end(),
                                compare_data.begin());

      CHECK(isEqual);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_clear)
    {
      Compare_DataNDC compare_data(initial_data.begin(), initial_data.end());

      DataNDC data(compare_data.begin(), compare_data.end());
      data.clear();
      CHECK_EQUAL(data.size(), size_t(0UL));

      // Do it again to check that clear() didn't screw up the internals.
      data.assign(compare_data.begin(), compare_data.end());
      CHECK_EQUAL(data.size(), compare_data.size());
      data.clear();
      CHECK_EQUAL(data.size(), size_t(0UL));
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_clear_pod)
    {
      DataInt data(int_data.begin(), int_data.end());

      data.clear();
      CHECK_EQUAL(data.size(), size_t(0UL));

      // Do it again to check that clear() didn't screw up the internals.
      data.assign(int_data.begin(), int_data.end());
      CHECK_EQUAL(data.size(), int_data.size());
      data.clear();
      CHECK_EQUAL(data.size(), size_t(0UL));
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_iterator)
    {
      Compare_DataNDC compare_data(initial_data.begin(), initial_data.end());

      DataNDC data(compare_data.begin(), compare_data.end());

      bool isEqual = std::equal(data.begin(),
                                data.end(),
                                compare_data.begin());

      CHECK(isEqual);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_const_iterator)
    {
      Compare_DataNDC compare_data(initial_data.begin(), initial_data.end());

      DataNDC data(compare_data.begin(), compare_data.end());

      bool isEqual = std::equal(data.cbegin(),
                                data.cend(),
                                compare_data.cbegin());

      CHECK(isEqual);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_reverse_iterator)
    {
      Compare_DataNDC compare_data(initial_data.begin(), initial_data.end());

      DataNDC data(compare_data.begin(), compare_data.end());

      bool isEqual = std::equal(data.rbegin(),
                                data.rend(),
                                compare_data.rbegin());

      CHECK(isEqual);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_const_reverse_iterator)
    {
      Compare_DataNDC compare_data(initial_data.begin(), initial_data.end());

      DataNDC data(compare_data.begin(), compare_data.end());

      bool isEqual = std::equal(data.crbegin(),
                                data.crend(),
                                compare_data.crbegin());

      CHECK(isEqual);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_find)
    {
      DataNDC data(initial_data.begin(), initial_data.end());

      DataNDC::iterator it = data.find(N3);
      CHECK_EQUAL(N3, *it);

      it = data.find(N19);
      CHECK(data.end() == it);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_find_using_transparent_comparator)
    {
      using ESet = etl::flat_multiset<NDC, SIZE, etl::less<>>;
      ESet data(initial_data.begin(), initial_data.end());

      ESet::iterator it = data.find(Key(N3));
      CHECK_EQUAL(N3, *it);

      it = data.find(N19);
      CHECK(data.end() == it);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_find_not_present)
    {
      DataNDC data(initial_data.begin(), initial_data.end());

      DataNDC::iterator it = data.find(NX);
      CHECK(data.end() == it);

      it = data.find(NY);
      CHECK(data.end() == it);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_find_not_present_using_transparent_comparator)
    {
      using ESet = etl::flat_multiset<NDC, SIZE, etl::less<>>;
      ESet data(initial_data.begin(), initial_data.end());

      ESet::iterator it = data.find(Key(NX));
      CHECK(data.end() == it);

      it = data.find(Key(NY));
      CHECK(data.end() == it);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_find_const)
    {
      const DataNDC data(initial_data.begin(), initial_data.end());

      DataNDC::const_iterator it = data.find(N3);
      CHECK_EQUAL(N3, *it);

      it = data.find(N19);
      CHECK(data.end() == it);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_find_const_using_transparent_comparator)
    {
      using ESet = etl::flat_multiset<NDC, SIZE, etl::less<>>;
      const ESet data(initial_data.begin(), initial_data.end());

      ESet::const_iterator it = data.find(Key(N3));
      CHECK_EQUAL(N3, *it);

      it = data.find(Key(N19));
      CHECK(data.end() == it);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_find_const_not_present)
    {
      const DataNDC data(initial_data.begin(), initial_data.end());

      DataNDC::const_iterator it = data.find(NX);
      CHECK(data.end() == it);

      it = data.find(NY);
      CHECK(data.end() == it);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_find_const_not_present_using_transparent_comparator)
    {
      using ESet = etl::flat_multiset<NDC, SIZE, etl::less<>>;
      const ESet data(initial_data.begin(), initial_data.end());

      ESet::const_iterator it = data.find(Key(NX));
      CHECK(data.end() == it);

      it = data.find(Key(NY));
      CHECK(data.end() == it);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_lower_bound)
    {
      Compare_DataNDC compare_data(initial_data.begin(), initial_data.end());
      DataNDC data(initial_data.begin(), initial_data.end());

      Compare_DataNDC::iterator i_compare = compare_data.lower_bound(N5);
      DataNDC::iterator         i_data    = data.lower_bound(N5);

      CHECK_EQUAL(std::distance(compare_data.begin(), i_compare), std::distance(data.begin(), i_data));
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_lower_bound_using_transparent_comparator)
    {
      using CSet = std::multiset<NDC>;
      CSet compare_data(initial_data.begin(), initial_data.end());

      using ESet = etl::flat_multiset<NDC, SIZE, etl::less<>>;
      ESet data(initial_data.begin(), initial_data.end());

      CSet::iterator i_compare = compare_data.lower_bound(N5);
      ESet::iterator i_data    = data.lower_bound(Key(N5));

      CHECK_EQUAL(std::distance(compare_data.begin(), i_compare), std::distance(data.begin(), i_data));
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_upper_bound)
    {
      Compare_DataNDC compare_data(initial_data.begin(), initial_data.end());
      DataNDC data(initial_data.begin(), initial_data.end());

      Compare_DataNDC::iterator i_compare = compare_data.upper_bound(N5);
      DataNDC::iterator         i_data    = data.upper_bound(N5);

      CHECK_EQUAL(std::distance(compare_data.begin(), i_compare), std::distance(data.begin(), i_data));
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_upper_bound_using_transparent_comparator)
    {
      using CSet = std::multiset<NDC>;
      CSet compare_data(initial_data.begin(), initial_data.end());

      using ESet = etl::flat_multiset<NDC, SIZE, etl::less<>>;
      ESet data(initial_data.begin(), initial_data.end());

      CSet::iterator i_compare = compare_data.upper_bound(N5);
      ESet::iterator i_data = data.upper_bound(Key(N5));

      CHECK_EQUAL(std::distance(compare_data.begin(), i_compare), std::distance(data.begin(), i_data));
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_equal_range)
    {
      Compare_DataNDC compare_data(initial_data.begin(), initial_data.end());
      DataNDC data(initial_data.begin(), initial_data.end());

      ETL_OR_STD::pair<Compare_DataNDC::iterator, Compare_DataNDC::iterator> i_compare = compare_data.equal_range(N5);
      ETL_OR_STD::pair<DataNDC::iterator, DataNDC::iterator> i_data = data.equal_range(N5);

      CHECK_EQUAL(std::distance(compare_data.begin(), i_compare.first),  std::distance(data.begin(), i_data.first));
      CHECK_EQUAL(std::distance(compare_data.begin(), i_compare.second), std::distance(data.begin(), i_data.second));
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_equal_range_using_transparent_comparator)
    {
      using CSet = std::multiset<NDC>;
      CSet compare_data(initial_data.begin(), initial_data.end());

      using ESet = etl::flat_multiset<NDC, SIZE, etl::less<>>;
      ESet data(initial_data.begin(), initial_data.end());

      ETL_OR_STD::pair<CSet::iterator, CSet::iterator> i_compare = compare_data.equal_range(N5);
      ETL_OR_STD::pair<ESet::iterator, ESet::iterator> i_data = data.equal_range(Key(N5));

      CHECK_EQUAL(std::distance(compare_data.begin(), i_compare.first), std::distance(data.begin(), i_data.first));
      CHECK_EQUAL(std::distance(compare_data.begin(), i_compare.second), std::distance(data.begin(), i_data.second));
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_equal_range_not_present)
    {
      DataNDC data(initial_data.begin(), initial_data.end());

      ETL_OR_STD::pair<DataNDC::iterator, DataNDC::iterator> i_data;

      i_data = data.equal_range(NX);
      CHECK(data.begin() == i_data.first);
      CHECK(data.begin() == i_data.second);

      i_data = data.equal_range(NY);
      CHECK(data.end() == i_data.first);
      CHECK(data.end() == i_data.second);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_equal_range_not_present_using_transparent_comparator)
    {
      using ESet = etl::flat_multiset<NDC, SIZE, etl::less<>>;
      ESet data(initial_data.begin(), initial_data.end());

      ETL_OR_STD::pair<ESet::iterator, ESet::iterator> i_data;

      i_data = data.equal_range(Key(NX));
      CHECK(data.begin() == i_data.first);
      CHECK(data.begin() == i_data.second);

      i_data = data.equal_range(Key(NY));
      CHECK(data.end() == i_data.first);
      CHECK(data.end() == i_data.second);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_equal)
    {
      const DataNDC initial1(initial_data.begin(), initial_data.end());
      const DataNDC initial2(initial_data.begin(), initial_data.end());

      CHECK(initial1 == initial2);

      const DataNDC different(different_data.begin(), different_data.end());

      CHECK(!(initial1 == different));
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_not_equal)
    {
      const DataNDC initial1(initial_data.begin(), initial_data.end());
      const DataNDC initial2(initial_data.begin(), initial_data.end());

      CHECK(!(initial1 != initial2));

      const DataNDC different(different_data.begin(), different_data.end());

      CHECK(initial1 != different);
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_multi)
    {
      Compare_DataNDC compare_data(multi_data.begin(), multi_data.end());
      DataNDC data(multi_data.begin(), multi_data.end());

      ETL_OR_STD::pair<Compare_DataNDC::iterator, Compare_DataNDC::iterator> compare_range;
      ETL_OR_STD::pair<DataNDC::iterator, DataNDC::iterator> test_range;

      compare_range = compare_data.equal_range(N0);
      test_range = data.equal_range(N0);
      CHECK_EQUAL(std::distance(compare_range.first, compare_range.second), std::distance(test_range.first, test_range.second));

      compare_range = compare_data.equal_range(N1);
      test_range = data.equal_range(N1);
      CHECK_EQUAL(std::distance(compare_range.first, compare_range.second), std::distance(test_range.first, test_range.second));

      compare_range = compare_data.equal_range(N2);
      test_range = data.equal_range(N2);
      CHECK_EQUAL(std::distance(compare_range.first, compare_range.second), std::distance(test_range.first, test_range.second));

      compare_range = compare_data.equal_range(N3);
      test_range = data.equal_range(N3);
      CHECK_EQUAL(std::distance(compare_range.first, compare_range.second), std::distance(test_range.first, test_range.second));

      compare_range = compare_data.equal_range(N4);
      test_range = data.equal_range(N4);
      CHECK_EQUAL(std::distance(compare_range.first, compare_range.second), std::distance(test_range.first, test_range.second));
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_count)
    {
      Compare_DataNDC compare_data(multi_data.begin(), multi_data.end());
      DataNDC data(multi_data.begin(), multi_data.end());

      CHECK_EQUAL(compare_data.count(N0), data.count(N0));
      CHECK_EQUAL(compare_data.count(N1), data.count(N1));
      CHECK_EQUAL(compare_data.count(N2), data.count(N2));
      CHECK_EQUAL(compare_data.count(N3), data.count(N3));
      CHECK_EQUAL(compare_data.count(N4), data.count(N4));
    }

    //*************************************************************************
#if ETL_USING_CPP17 && ETL_HAS_INITIALIZER_LIST && !defined(ETL_TEMPLATE_DEDUCTION_GUIDE_TESTS_DISABLED)
    TEST_FIXTURE(SetupFixture, test_flat_set_template_deduction)
    {
      etl::flat_multiset data{ NDC("A"), NDC("B"), NDC("B2"), NDC("C"), NDC("D"), NDC("E"), NDC("F") };

      auto v = *data.begin();
      using Type = decltype(v);
      CHECK((std::is_same_v<NDC, Type>));

      decltype(data)::const_iterator itr = data.begin();

      CHECK_EQUAL(NDC("A"), *itr);
      ++itr;
      CHECK_EQUAL(NDC("B"), *itr);
      ++itr;
      CHECK_EQUAL(NDC("B2"), *itr);
      ++itr;
      CHECK_EQUAL(NDC("C"), *itr);
      ++itr;
      CHECK_EQUAL(NDC("D"), *itr);
      ++itr;
      CHECK_EQUAL(NDC("E"), *itr);
      ++itr;
      CHECK_EQUAL(NDC("F"), *itr);
    }
#endif

    //*************************************************************************
#if ETL_HAS_INITIALIZER_LIST
    TEST_FIXTURE(SetupFixture, test_make_flat_multiset)
    {
      auto data = etl::make_flat_multiset<NDC>(NDC("A"), NDC("B"), NDC("B2"), NDC("C"), NDC("D"), NDC("E"), NDC("F"));

      auto v = *data.begin();
      using Type = decltype(v);
      CHECK((std::is_same<NDC, Type>::value));

      decltype(data)::const_iterator itr = data.begin();

      CHECK_EQUAL(NDC("A"), *itr);
      ++itr;
      CHECK_EQUAL(NDC("B"), *itr);
      ++itr;
      CHECK_EQUAL(NDC("B2"), *itr);
      ++itr;
      CHECK_EQUAL(NDC("C"), *itr);
      ++itr;
      CHECK_EQUAL(NDC("D"), *itr);
      ++itr;
      CHECK_EQUAL(NDC("E"), *itr);
      ++itr;
      CHECK_EQUAL(NDC("F"), *itr);
    }
#endif

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_contains)
    {
      DataNDC data(initial_data.begin(), initial_data.end());

      CHECK(data.contains(N5));
      CHECK(!data.contains(NX));
    }

    //*************************************************************************
    TEST_FIXTURE(SetupFixture, test_contains_with_transparent_comparator)
    {
      using EMap = etl::flat_multiset<NDC, SIZE, etl::less<>>;
      EMap data(initial_data.begin(), initial_data.end());

      CHECK(data.contains(Key(N5)));
      CHECK(!data.contains(Key(NX)));
    }
  };
}