etl/test/test_fixed_iterator.cpp

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

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

Copyright(c) 2014 John Wellbelove

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

#include "unit_test_framework.h"
#include <ostream>
#include <vector>

#include "etl/fixed_iterator.h"

template <typename TIterator>
std::ostream& operator<<(std::ostream& os, const etl::fixed_iterator<TIterator>& fi)
{
  os << TIterator(fi);

  return os;
}

namespace
{
  SUITE(test_fixed_iterator)
  {
    //*************************************************************************
    TEST(test_default_constructor)
    {
      etl::fixed_iterator<const int*> fi;

      CHECK_EQUAL((const int*)0, fi);
    }

    //*************************************************************************
    TEST(test_copy_constructor)
    {
      int a{};

      etl::fixed_iterator<const int*> fi1(&a);
      etl::fixed_iterator<const int*> fi2(fi1);

      CHECK_EQUAL(fi1, fi2);
    }

    //*************************************************************************
    TEST(test_constructor)
    {
      int a{};

      etl::fixed_iterator<const int*> fi(&a);

      CHECK_EQUAL(&a, fi);
    }

    //*************************************************************************
    TEST(test_make)
    {
      int a{};

      etl::fixed_iterator<const int*> fi = &a;

      CHECK_EQUAL(&a, fi);
    }

    //*************************************************************************
    TEST(test_increment)
    {
      int compare[] = {1, 2, 3, 4};

      etl::fixed_iterator<const int*> fi = &compare[1];

      for (int i = 0; i < 10; ++i)
      {
        CHECK_EQUAL(compare[1], *fi);
        ++fi;
        fi++;
      }
    }

    //*************************************************************************
    TEST(test_member_dereference_operator)
    {
      struct Object
      {
        int a;
        int b;
      } object = {1, 2};

      etl::fixed_iterator<Object*> fi(&object);

      CHECK_EQUAL(object.a, fi->a);
      CHECK_EQUAL(object.b, fi->b);

      *fi = {3, 4};

      CHECK_EQUAL(object.a, fi->a);
      CHECK_EQUAL(object.b, fi->b);
    }

    //*************************************************************************
    TEST(test_conversion_operator)
    {
      int a{};

      etl::fixed_iterator<const int*> fi(&a);

      CHECK_EQUAL(&a, fi);
    }

    //*************************************************************************
    TEST(test_operator_plus_equals)
    {
      int compare[] = {1, 2, 3, 4};

      etl::fixed_iterator<const int*> fi = &compare[1];

      for (int i = 0; i < 10; ++i)
      {
        CHECK_EQUAL(compare[1], *fi);
        fi += 1;
      }
    }

    //*************************************************************************
    TEST(test_operator_plus)
    {
      int compare[] = {1, 2, 3, 4};

      etl::fixed_iterator<const int*> fi = &compare[1];

      for (int i = 0; i < 10; ++i)
      {
        CHECK_EQUAL(compare[1], *fi);
        fi = fi + 1;
      }
    }

    //*************************************************************************
    TEST(test_decrement)
    {
      int compare[] = {1, 2, 3, 4};

      etl::fixed_iterator<const int*> fi = &compare[1];

      for (int i = 0; i < 10; ++i)
      {
        CHECK_EQUAL(compare[1], *fi);
        --fi;
        fi--;
      }
    }

    //*************************************************************************
    TEST(test_operator_minus_equals)
    {
      int compare[] = {1, 2, 3, 4};

      etl::fixed_iterator<const int*> fi = &compare[1];

      for (int i = 0; i < 10; ++i)
      {
        CHECK_EQUAL(compare[1], *fi);
        fi -= 1;
      }
    }

    //*************************************************************************
    TEST(test_operator_minus)
    {
      int compare[] = {1, 2, 3, 4};

      etl::fixed_iterator<const int*> fi = &compare[1];

      for (int i = 0; i < 10; ++i)
      {
        CHECK_EQUAL(compare[1], *fi);
        fi = fi - 1;
      }
    }

    //*************************************************************************
    TEST(test_assignment)
    {
      int a{};
      int b{};

      etl::fixed_iterator<int*> fi = &a;
      fi                           = &b;

      CHECK_EQUAL(&b, fi);

      fi = &a;

      CHECK_EQUAL(&a, fi);
    }

    //*************************************************************************
    TEST(test_equality)
    {
      int a{};
      int b{};

      etl::fixed_iterator<int*> fi1 = &a;
      etl::fixed_iterator<int*> fi2 = &a;
      etl::fixed_iterator<int*> fi3 = &b;

      CHECK(fi1 == fi2);
      CHECK(fi1 != fi3);
    }

    //*************************************************************************
    TEST(test_dereference_write_through)
    {
      int                       value = 42;
      etl::fixed_iterator<int*> fi(&value);

      // Writing through the dereferenced iterator should modify the underlying value.
      *fi = 99;
      CHECK_EQUAL(99, value);

      // Increment does nothing, so writing again still targets the same location.
      ++fi;
      *fi = 123;
      CHECK_EQUAL(123, value);
    }

#if ETL_USING_CPP14
    //*************************************************************************
    TEST(test_fixed_iterator_constexpr_ctor)
    {
      static constexpr int                      data[] = {1, 2, 3};
      constexpr etl::fixed_iterator<const int*> fi(&data[1]);
      static_assert(*fi == 2, "constexpr ctor and deref");
      CHECK(true);
    }

    //*************************************************************************
    TEST(test_fixed_iterator_constexpr_copy_ctor)
    {
      static constexpr int                      data[] = {1, 2, 3};
      constexpr etl::fixed_iterator<const int*> fi1(&data[0]);
      constexpr etl::fixed_iterator<const int*> fi2(fi1);
      static_assert(*fi2 == 1, "constexpr copy ctor");
      CHECK(true);
    }
#endif
  }
} // namespace