etl/test/test_multi_loop.cpp

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

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

Copyright(c) 2014 jwellbelove

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

#include "UnitTest++/UnitTest++.h"

#include "etl/multi_loop.h"

#include <array>
#include <fstream>

namespace
{
  class Index
  {
  public:

    Index()
      : index(0)
    {
    }

    Index(int i)
      : index(i)
    {
    }

    Index& operator ++()
    {
      ++index;
      return *this;
    }

    Index& operator = (int i)
    {
      index = i;
      return *this;
    }

    bool operator = (const Index& other)
    {
      index = other.index;

      return *this;
    }

    bool operator < (const Index& other) const
    {
      return index < other.index;
    }

    operator int() const
    {
      return index;
    }

    friend bool operator == (const Index& lhs, const Index& rhs)
    {
      return lhs.index == rhs.index;
    }

    friend bool operator != (const Index& lhs, const Index& rhs)
    {
      return !(lhs == rhs);
    }

    int index;
  };

  std::ostream& operator << (std::ostream& os, const Index& index)
  {
    os << int(index);
    return os;
  }

  constexpr size_t N_LOOPS = 3;

  using MultiLoop = etl::multi_loop<Index, N_LOOPS>;

  SUITE(test_multi_loop)
  {
    //*************************************************************************
    TEST(default_constructor)
    {
      MultiLoop loops;

      CHECK_EQUAL(N_LOOPS, loops.max_number_of_loops());
      CHECK_EQUAL(0U, loops.number_of_loops());
      CHECK(loops.completed());
    }

    //*************************************************************************
    TEST(create_three_loops)
    {
      MultiLoop loops;

      CHECK_EQUAL(N_LOOPS, loops.max_number_of_loops());

      loops.add_outer(Index(-2), Index(2)); // Middle loop
      loops.add_outer(Index(0),  Index(4)); // Outer loop
      loops.add_inner(Index(2),  Index(6)); // Inner loop

      CHECK_EQUAL(3U, loops.number_of_loops());
      CHECK(!loops.completed());

      CHECK_EQUAL(Index(0),       loops.begin(0));
      CHECK_EQUAL(Index(4),       loops.end(0));
      CHECK_EQUAL(loops.begin(0), loops.index(0));

      CHECK_EQUAL(Index(-2),      loops.begin(1));
      CHECK_EQUAL(Index(2),       loops.end(1));
      CHECK_EQUAL(loops.begin(1), loops.index(1));

      CHECK_EQUAL(Index(2),       loops.begin(2));
      CHECK_EQUAL(Index(6),       loops.end(2));
      CHECK_EQUAL(loops.begin(2), loops.index(2));
    }

    //*************************************************************************
    TEST(run_three_loops)
    {
      MultiLoop loops;

      CHECK_EQUAL(N_LOOPS, loops.max_number_of_loops());

      loops.add_outer(Index(-2), Index(2)); // Middle loop
      loops.add_outer(Index(0),  Index(4)); // Outer loop
      loops.add_inner(Index(2),  Index(6)); // Inner loop
      
      struct result
      {
        Index index0;
        Index index1;
        Index index2;
      };

      std::array results
      {       
          result{ 0, -2, 2 }, result{ 0, -2, 3 }, result{ 0, -2, 4 }, result{ 0, -2, 5 },
          result{ 0, -1, 2 }, result{ 0, -1, 3 }, result{ 0, -1, 4 }, result{ 0, -1, 5 },
          result{ 0,  0, 2 }, result{ 0,  0, 3 }, result{ 0,  0, 4 }, result{ 0,  0, 5 },
          result{ 0,  1, 2 }, result{ 0,  1, 3 }, result{ 0,  1, 4 }, result{ 0,  1, 5 },
          result{ 1, -2, 2 }, result{ 1, -2, 3 }, result{ 1, -2, 4 }, result{ 1, -2, 5 },
          result{ 1, -1, 2 }, result{ 1, -1, 3 }, result{ 1, -1, 4 }, result{ 1, -1, 5 },
          result{ 1,  0, 2 }, result{ 1,  0, 3 }, result{ 1,  0, 4 }, result{ 1,  0, 5 },
          result{ 1,  1, 2 }, result{ 1,  1, 3 }, result{ 1,  1, 4 }, result{ 1,  1, 5 },
          result{ 2, -2, 2 }, result{ 2, -2, 3 }, result{ 2, -2, 4 }, result{ 2, -2, 5 },
          result{ 2, -1, 2 }, result{ 2, -1, 3 }, result{ 2, -1, 4 }, result{ 2, -1, 5 },
          result{ 2,  0, 2 }, result{ 2,  0, 3 }, result{ 2,  0, 4 }, result{ 2,  0, 5 },
          result{ 2,  1, 2 }, result{ 2,  1, 3 }, result{ 2,  1, 4 }, result{ 2,  1, 5 },
          result{ 3, -2, 2 }, result{ 3, -2, 3 }, result{ 3, -2, 4 }, result{ 3, -2, 5 },
          result{ 3, -1, 2 }, result{ 3, -1, 3 }, result{ 3, -1, 4 }, result{ 3, -1, 5 },
          result{ 3,  0, 2 }, result{ 3,  0, 3 }, result{ 3,  0, 4 }, result{ 3,  0, 5 },
          result{ 3,  1, 2 }, result{ 3,  1, 3 }, result{ 3,  1, 4 }, result{ 3,  1, 5 }       
      };

      size_t i = 0U;

      for (loops.start(); loops.completed() == false; loops.next())
      {
        CHECK_EQUAL(results[i].index0, loops.index(0));
        CHECK_EQUAL(results[i].index1, loops.index(1));
        CHECK_EQUAL(results[i].index2, loops.index(2));

        if ((results[i].index0 != loops.index(0)) ||
            (results[i].index1 != loops.index(1)) ||
            (results[i].index2 != loops.index(2)))
        {
          CHECK_EQUAL(UINT_MAX, i);
        }

        ++i;
      }

      CHECK(loops.completed());

      // Do it again to make sure things have been reset correctly.
      i = 0U;

      for (loops.start(); loops.completed() == false; loops.next())
      {
        CHECK_EQUAL(results[i].index0, loops.index(0));
        CHECK_EQUAL(results[i].index1, loops.index(1));
        CHECK_EQUAL(results[i].index2, loops.index(2));

        if ((results[i].index0 != loops.index(0)) ||
          (results[i].index1 != loops.index(1)) ||
          (results[i].index2 != loops.index(2)))
        {
          CHECK_EQUAL(UINT_MAX, i);
        }

        ++i;
      }

      CHECK(loops.completed());
    }
  };
}