etl/test/test_closure_with_default_delegate.cpp

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

Embedded Template Library.
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https://www.etlcpp.com

Copyright(c) 2025 BMW AG, John Wellbelove

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#include "unit_test_framework.h"

#include "etl/closure.h"

#include <stdexcept>

namespace
{
  SUITE(test_closure_with_default_delegate)
  {
    int f1(int a1)
    {
      return a1 * 3;
    }

    int f1_throwing(int)
    {
      throw std::runtime_error("throwing function");
    }

    void f1_void(int) {}

    int f1_ref(int& a1)
    {
      return a1 * 3;
    }

    int f2(int a1, int a2)
    {
      return a1 * 3 + a2;
    }

    int f3(int a1, int a2, int a3)
    {
      return a1 * 3 + a2 * a3;
    }

    int f4(int a1, int a2, int a3, int a4)
    {
      return a1 * 3 + a2 * a3 + a4;
    }

    int f5(int a1, int a2, int a3, int a4, int a5)
    {
      return a1 * 3 + a2 * a3 + a4 * a5;
    }

    etl::delegate<int(int)>                     df1          = etl::delegate<int(int)>::create<&f1>();
    etl::delegate<int(int)>                     df1_throwing = etl::delegate<int(int)>::create<&f1_throwing>();
    etl::delegate<void(int)>                    df1_void     = etl::delegate<void(int)>::create<&f1_void>();
    etl::delegate<int(int, int)>                df2          = etl::delegate<int(int, int)>::create<&f2>();
    etl::delegate<int(int, int, int)>           df3          = etl::delegate<int(int, int, int)>::create<&f3>();
    etl::delegate<int(int, int, int, int)>      df4          = etl::delegate<int(int, int, int, int)>::create<&f4>();
    etl::delegate<int(int, int, int, int, int)> df5          = etl::delegate<int(int, int, int, int, int)>::create<&f5>();

    etl::delegate<int(int&)> df1_ref = etl::delegate<int(int&)>::create<&f1_ref>();

    //*************************************************************************
    TEST(test_1_arg)
    {
      etl::closure<int(int)> c1(df1, 4);
      CHECK_EQUAL(12, c1());
    }

    //*************************************************************************
    TEST(test_1_arg_reference)
    {
      int                     v1 = 4;
      etl::closure<int(int&)> c1_ref(df1_ref, v1);
      CHECK_EQUAL(12, c1_ref());
      v1 = 5;
      CHECK_EQUAL(15, c1_ref());
    }

    //*************************************************************************
    TEST(test_1_arg_lambda)
    {
      auto l = [](int a)
      {
        return a + 11;
      };
      etl::delegate<int(int)> df1_lambda(l);

      etl::closure<int(int)> c1_lambda(df1_lambda, 5);
      CHECK_EQUAL(16, c1_lambda());
    }

    //*************************************************************************
    TEST(test_throwing)
    {
      etl::closure<int(int)> c1(df1_throwing, 4);
      CHECK_THROW(c1(), std::runtime_error);
    }

    //*************************************************************************
    TEST(test_void)
    {
      etl::closure<void(int)> c1(df1_void, 4);
      c1();
    }

    //*************************************************************************
    TEST(test_2_args)
    {
      etl::closure<int(int, int)> c2(df2, 4, 3);
      CHECK_EQUAL(15, c2());
    }

#if ETL_USING_CPP11 && !defined(ETL_CLOSURE_FORCE_CPP03_IMPLEMENTATION)
    //*************************************************************************
    TEST(test_2_args_bind)
    {
      etl::closure<int(int, int)> c2(df2, 4, 3);
      CHECK_EQUAL(15, c2());

      c2.bind<0>(7);
      c2.bind<1>(8);
      CHECK_EQUAL(29, c2());
    }

    //*************************************************************************
    TEST(test_2_args_bind_all)
    {
      etl::closure<int(int, int)> c2(df2, 4, 3);
      CHECK_EQUAL(15, c2());

      c2.bind(7, 8);
      CHECK_EQUAL(29, c2());
    }
#endif

    //*************************************************************************
    TEST(test_3_args)
    {
      etl::closure<int(int, int, int)> c3(df3, 4, 3, 2);
      CHECK_EQUAL(18, c3());
    }

    //*************************************************************************
    TEST(test_4_args)
    {
      etl::closure<int(int, int, int, int)> c4(df4, 4, 3, 2, 1);
      CHECK_EQUAL(19, c4());
    }

    //*************************************************************************
    TEST(test_5_args)
    {
      etl::closure<int(int, int, int, int, int)> c5(df5, 4, 3, 2, 1, 5);
      CHECK_EQUAL(23, c5());
    }

    //*************************************************************************
    TEST(test_bind_static_assert)
    {
      etl::closure<int(int, int)> c(df2, 1, 2);

      // Uncomment to generate static_assert errors.
      // c.bind(1);                // Argument count mismatch
      // c.bind(1, 2, 3);          // Argument count mismatch
      // c.bind(1, std::string()); // Argument is not convertible
    }
  }
} // namespace