fsfw/contrib/fsfw_contrib/etl-20.39.4/test/test_mem_cast_ptr.cpp

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

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

Copyright(c) 2021 John Wellbelove

Permission is hereby granted, free of charge, to any person obtaining a copy
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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******************************************************************************/

#include "unit_test_framework.h"

#include "etl/mem_cast.h"
#include "etl/largest.h"

#include <array>
#include <vector>
#include <algorithm>
#include <string>

namespace
{
  struct Data
  {
    Data()
      : c(0)
      , d(0)
      , a()
    {
    }

    Data(char c_, double d_, std::array<int, 3> a_)
      : c(c_)
      , d(d_)
      , a(a_)
    {
    }

    char c;
    double d;
    std::array<int, 3> a;
  };

  constexpr size_t Size      = etl::largest<char, double, Data>::size;
  constexpr size_t Alignment = etl::largest<char, double, Data>::alignment;

  // Test variant types.
  using MemCast = etl::mem_cast_ptr;
  
  Data   data;

  char* Ptr(int i)
  {
    return reinterpret_cast<char*>(uintptr_t(i));
  }

  typename std::aligned_storage<Size, Alignment>::type buffer;
  
  SUITE(test_mem_cast_ptr)
  {
    //*************************************************************************
    TEST(test_alignment)
    {
      MemCast memCast;

      memCast.data(Ptr(1));
      CHECK_EQUAL(1U , memCast.alignment());

      memCast.data(Ptr(2));
      CHECK_EQUAL(2U , memCast.alignment());

      memCast.data(Ptr(3));
      CHECK_EQUAL(1U , memCast.alignment());

      memCast.data(Ptr(4));
      CHECK_EQUAL(4U , memCast.alignment());

      memCast.data(Ptr(5));
      CHECK_EQUAL(1U , memCast.alignment());

      memCast.data(Ptr(6));
      CHECK_EQUAL(2U , memCast.alignment());

      memCast.data(Ptr(7));
      CHECK_EQUAL(1U , memCast.alignment());

      memCast.data(Ptr(8));
      CHECK_EQUAL(8U , memCast.alignment());

      memCast.data(Ptr(9));
      CHECK_EQUAL(1U , memCast.alignment());

      memCast.data(Ptr(10));
      CHECK_EQUAL(2U , memCast.alignment());

      memCast.data(Ptr(11));
      CHECK_EQUAL(1U , memCast.alignment());

      memCast.data(Ptr(12));
      CHECK_EQUAL(4U , memCast.alignment());

      memCast.data(Ptr(13));
      CHECK_EQUAL(1U , memCast.alignment());

      memCast.data(Ptr(14));
      CHECK_EQUAL(2U , memCast.alignment());

      memCast.data(Ptr(15));
      CHECK_EQUAL(1U , memCast.alignment());

      memCast.data(Ptr(16));
      CHECK_EQUAL(16U , memCast.alignment());

      memCast.data(Ptr(17));
      CHECK_EQUAL(1U , memCast.alignment());

      memCast.data(Ptr(18));
      CHECK_EQUAL(2U , memCast.alignment());

      memCast.data(Ptr(19));
      CHECK_EQUAL(1U , memCast.alignment());

      memCast.data(Ptr(20));
      CHECK_EQUAL(4U , memCast.alignment());

      memCast.data(Ptr(21));
      CHECK_EQUAL(1U , memCast.alignment());

      memCast.data(Ptr(22));
      CHECK_EQUAL(2U , memCast.alignment());

      memCast.data(Ptr(23));
      CHECK_EQUAL(1U , memCast.alignment());

      memCast.data(Ptr(24));
      CHECK_EQUAL(8U , memCast.alignment());

      memCast.data(Ptr(25));
      CHECK_EQUAL(1U , memCast.alignment());

      memCast.data(Ptr(26));
      CHECK_EQUAL(2U , memCast.alignment());

      memCast.data(Ptr(27));
      CHECK_EQUAL(1U , memCast.alignment());

      memCast.data(Ptr(28));
      CHECK_EQUAL(4U , memCast.alignment());

      memCast.data(Ptr(29));
      CHECK_EQUAL(1U , memCast.alignment());

      memCast.data(Ptr(30));
      CHECK_EQUAL(2U , memCast.alignment());

      memCast.data(Ptr(31));
      CHECK_EQUAL(1U , memCast.alignment());

      memCast.data(Ptr(32));
      CHECK_EQUAL(32U , memCast.alignment());
    }

    //*************************************************************************
    TEST(test_mem_cast_assign_type)
    {
      char* pbuffer = reinterpret_cast<char*>(&buffer);

      using Array = std::array<int, 3>;

      MemCast memCast(pbuffer); 

      memCast.assign<char>(123);
      CHECK_EQUAL(123, memCast.ref<char>());

      memCast.assign<double>(1.23);
      CHECK_EQUAL(1.23, memCast.ref<double>());

      Data data(123, 1.23, std::array<int, 3>{ 1, 2, 3 });
      memCast.assign<Data>(data);
      CHECK_EQUAL(123, memCast.ref<Data>().c);
      CHECK_EQUAL(1.23, memCast.ref<Data>().d);
      CHECK((Array{ 1, 2, 3 }) == memCast.ref<Data>().a);
    }

    //*************************************************************************
    TEST(test_mem_cast_assign_type_at_dynamic_offset)
    {
      char* pbuffer = reinterpret_cast<char*>(&buffer);

      MemCast memCast(pbuffer); 

      using Array = std::array<int, 3>;
      Array a{ 1, 2, 3 };

      size_t offset = offsetof(Data, a);

      memCast.assign_at_offset<Array>(offset, a);
      CHECK(a == memCast.ref<Data>().a);
    }

    //*************************************************************************
    TEST(test_mem_cast_assign_type_at_static_offset)
    {
      char* pbuffer = reinterpret_cast<char*>(&buffer);

      MemCast memCast(pbuffer); 

      using Array = std::array<int, 3>;
      Array a{ 1, 2, 3 };

      constexpr size_t Offset = offsetof(Data, a);

      memCast.assign_at_offset<Array, Offset>(a);
      CHECK(a == memCast.ref<Data>().a);
    }

    //*************************************************************************
    TEST(test_mem_cast_emplace_type)
    {
      char* pbuffer = reinterpret_cast<char*>(&buffer);

      using Array = std::array<int, 3>;

      MemCast memCast(pbuffer); 

      memCast.emplace<char>(123);
      CHECK_EQUAL(123, memCast.ref<char>());

      memCast.emplace<double>(1.23);
      CHECK_EQUAL(1.23, memCast.ref<double>());

      memCast.emplace<Data>(123, 1.23, std::array<int, 3>{ 1, 2, 3 });
      CHECK_EQUAL(123, memCast.ref<Data>().c);
      CHECK_EQUAL(1.23, memCast.ref<Data>().d);
      CHECK((Array{ 1, 2, 3 }) == memCast.ref<Data>().a);
    }

    //*************************************************************************
    TEST(test_mem_cast_emplace_type_at_dynamic_offset)
    {
      char* pbuffer = reinterpret_cast<char*>(&buffer);

      MemCast memCast(pbuffer); 

      using Array = std::array<int, 3>;
      Array a{ 1, 2, 3 };

      size_t offset = offsetof(Data, a);

      memCast.emplace_at_offset<Array>(offset, a);
      CHECK(a == memCast.ref<Data>().a);
    }

    //*************************************************************************
    TEST(test_mem_cast_emplace_type_at_static_offset)
    {
      char* pbuffer = reinterpret_cast<char*>(&buffer);

      MemCast memCast(pbuffer);

      using Array = std::array<int, 3>;
      Array a{ 1, 2, 3 };

      constexpr size_t Offset = offsetof(Data, a);

      memCast.emplace_at_offset<Array, Offset>(a);
      CHECK(a == memCast.ref<Data>().a);
    }

    //*************************************************************************
    TEST(test_mem_cast_to_type)
    {
      char* pbuffer = reinterpret_cast<char*>(&buffer);

      using Array = std::array<int, 3>;

      MemCast memCast(pbuffer); 

      pbuffer = memCast.data();
      *pbuffer = 123;
      CHECK_EQUAL(123, memCast.ref<char>());

      *reinterpret_cast<double*>(pbuffer) = 1.23;
      CHECK_EQUAL(1.23, memCast.ref<double>());

      *reinterpret_cast<Data*>(pbuffer) = { 123, 1.23, { 1, 2, 3 } };
      CHECK_EQUAL(123, memCast.ref<Data>().c);
      CHECK_EQUAL(1.23, memCast.ref<Data>().d);
      CHECK((Array{ 1, 2, 3 }) == memCast.ref<Data>().a);
    }

    //*************************************************************************
    TEST(test_const_mem_cast_to_type)
    {
      char* pbuffer = reinterpret_cast<char*>(&buffer);

      using Array = std::array<int, 3>;

      const MemCast memCast(pbuffer); 

      *pbuffer = 123;
      CHECK_EQUAL(123, memCast.ref<char>());

      *reinterpret_cast<double*>(pbuffer) = 1.23;
      CHECK_EQUAL(1.23, memCast.ref<double>());

      *reinterpret_cast<Data*>(pbuffer) = { 123, 1.23, { 1, 2, 3 } };
      CHECK_EQUAL(123, memCast.ref<Data>().c);
      CHECK_EQUAL(1.23, memCast.ref<Data>().d);
      CHECK((Array{ 1, 2, 3 }) == memCast.ref<Data>().a);
    }

    //*************************************************************************
    TEST(test_mem_cast_to_type_no_buffer)
    {
      MemCast memCast; 
      char c = 0;

      CHECK_THROW(c = memCast.ref<char>(), etl::mem_cast_nullptr_exception);
      CHECK(c == 0);
    }

    //*************************************************************************
    TEST(test_const_mem_cast_to_type_no_buffer)
    {
      const MemCast memCast; 
      char c = 0;
      
      CHECK_THROW(c = memCast.ref<char>(), etl::mem_cast_nullptr_exception);
      CHECK(c == 0);
    }
  };
}