_GTestEnumMapper.cxx

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/* Copyright (C) 2025 GSI Helmholtzzentrum fuer Schwerionenforschung, Darmstadt
   SPDX-License-Identifier: GPL-3.0-only
   Authors: Sergei Zharko [committer] */

 
#include "CbmEnumKeySet.h"
#include "CbmEnumMap.h"
#include "gtest/gtest.h"
 
#include <type_traits>
 
// Some enumeration
enum class ESomeEnum
{
  A,
  B,
  C,
  D,
  E,
  F
};
 
using SomeKeySet_t = cbm::util::EnumKeySet<ESomeEnum::B, ESomeEnum::D, ESomeEnum::E>;
 
template<typename T>
using SomeMap_t = cbm::util::EnumMap<T, SomeKeySet_t>;
 
TEST(_GTestEnumMapper, CanInstantiateMapper)
{
  SCOPED_TRACE("CanInstantiateMapper");
 
  // Check keys
  EXPECT_EQ(SomeKeySet_t::CheckKey(ESomeEnum::B), true);   // the key is in the mapper
  EXPECT_EQ(SomeKeySet_t::CheckKey(ESomeEnum::F), false);  // the key is not in the mapper
  EXPECT_EQ(SomeKeySet_t::Index(ESomeEnum::B), 0);
  EXPECT_EQ(SomeKeySet_t::Index(ESomeEnum::D), 1);
  EXPECT_EQ(SomeKeySet_t::Index(ESomeEnum::E), 2);
  EXPECT_EQ(SomeKeySet_t::Index<ESomeEnum::B>(), 0);
  EXPECT_EQ(SomeKeySet_t::Index<ESomeEnum::D>(), 1);
  EXPECT_EQ(SomeKeySet_t::Index<ESomeEnum::E>(), 2);
  EXPECT_EQ(std::is_trivially_copyable_v<SomeMap_t<double>>, true);
 
  // Instantiate some map
  SomeMap_t<int> myMap = {{ESomeEnum::B, 10}, {ESomeEnum::D, 20}, {ESomeEnum::E, 30}};
 
  // Loop over keys and make an operation on values
  int res = 0;
  for (ESomeEnum key : SomeKeySet_t::kKeys) {
    myMap[key] *= 2;
    res += myMap[key];
  }
 
  EXPECT_EQ(res, 120);
 
  // Test constant-expression instantiation
  constexpr SomeMap_t<int> constexprMap1 = {{ESomeEnum::B, 1}, {ESomeEnum::D, 2}};
  constexpr SomeMap_t<int> constexprMap2 = {{ESomeEnum::B, 1}, {ESomeEnum::D, 2}, {ESomeEnum::E, 3}};
}