etl/test/test_functional.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/functional.h"

#include <list>
#include <vector>
#include <numeric>

namespace
{
  template <typename TCompare>
  bool compare(int a, int b)
  {
    return TCompare()(a, b);
  }

  struct test : etl::binary_function<int, int, bool>
  {
    bool operator()(int a, int b) const
    {
      return a < b;
    }
  };

  SUITE(test_functional)
  {
    //*************************************************************************
    TEST(test_less)
    {
      CHECK((compare<etl::less<int>>(1, 2)));
      CHECK(!(compare<etl::less<int>>(2, 1)));
      CHECK(!(compare<etl::less<int>>(1, 1)));
    }

    //*************************************************************************
    TEST(test_greater)
    {
      CHECK(!(compare<etl::greater<int>>(1, 2)));
      CHECK((compare<etl::greater<int>>(2, 1)));
      CHECK(!(compare<etl::greater<int>>(1, 1)));
    }

    //*************************************************************************
    TEST(test_equal_to)
    {
      CHECK((compare<etl::equal_to<int>>(1, 1)));
      CHECK(!(compare<etl::equal_to<int>>(1, 2)));
      CHECK(!(compare<etl::equal_to<int>>(2, 1)));
    }

    //*************************************************************************
    TEST(test_not_equal_to)
    {
      CHECK(!(compare<etl::not_equal_to<int>>(1, 1)));
      CHECK((compare<etl::not_equal_to<int>>(1, 2)));
      CHECK((compare<etl::not_equal_to<int>>(2, 1)));
    }

    //*************************************************************************
    TEST(test_bind1st)
    {
      CHECK((etl::bind1st(test(), 1)(2)));
      CHECK(!(etl::bind1st(test(), 2)(1)));
    }

    //*************************************************************************
    TEST(test_bind2nd)
    {
      CHECK(!(etl::bind2nd(test(), 1)(2)));
      CHECK((etl::bind2nd(test(), 2)(1)));
    }

    //*************************************************************************
    TEST(test_reference_wrapper)
    {
      int a = 0;
      etl::reference_wrapper<int> ra(a);

      ra.get() = 1;
      CHECK_EQUAL(1, a);
      CHECK_EQUAL(1, ra);

      a = 2;
      CHECK_EQUAL(2, a);
      CHECK_EQUAL(2, ra);
    }

    //*************************************************************************
    TEST(test_reference_wrapper_container)
    {
      std::list<int> test    = { 0, 1, 2, 3, 4 };
      std::list<int> compare = { 0, 1, 2, 3, 4 };
      std::vector<etl::reference_wrapper<int>> test_ref(test.begin(), test.end());

      std::list<int>::const_iterator itest    = test.begin();
      std::list<int>::const_iterator icompare = compare.begin();

      while (icompare != compare.end())
      {
        CHECK_EQUAL(*icompare, *itest);
        ++itest;
        ++icompare;
      }
    }

    //*************************************************************************
    TEST(test_ref)
    {
      int a = 0;
      etl::reference_wrapper<int> ra = etl::ref(a);

      ra.get() = 1;
      CHECK_EQUAL(1, a);
      CHECK_EQUAL(1, ra);
    }

    //*************************************************************************
    TEST(test_cref)
    {
      int a = 0;
      etl::reference_wrapper<const int> ra = etl::cref(a);

      a = 1;
      CHECK_EQUAL(1, a);
      CHECK_EQUAL(1, ra);
    }

    //*************************************************************************
    TEST(test_pre_increment)
    {
      etl::pre_increment<int> pi;

      int i = 0;
      int j = 0;
      
      pi(i);
      j = pi(i);

      CHECK_EQUAL(2, i);
      CHECK_EQUAL(2, j);
    }

    //*************************************************************************
    TEST(test_post_increment)
    {
      etl::post_increment<int> pi;

      int i = 0;
      int j = 0;

      pi(i);
      j = pi(i);

      CHECK_EQUAL(2, i);
      CHECK_EQUAL(1, j);
    }

    //*************************************************************************
    TEST(test_pre_decrement)
    {
      etl::pre_decrement<int> pi;

      int i = 0;
      int j = 0;

      pi(i);
      j = pi(i);

      CHECK_EQUAL(-2, i);
      CHECK_EQUAL(-2, j);
    }

    //*************************************************************************
    TEST(test_post_decrement)
    {
      etl::post_decrement<int> pi;

      int i = 0;
      int j = 0;

      pi(i);
      j = pi(i);

      CHECK_EQUAL(-2, i);
      CHECK_EQUAL(-1, j);
    }
  };
}