cpp-reflection/test/typecast_test.cxx

//
//  typecast_test.cxx
//  reflection-test
//
//  Created by Sam Jaffe on 7/5/22.
//  Copyright © 2022 Sam Jaffe. All rights reserved.
//

#define REFLECTION_TYPE_CAST_IMPLEMENTATION
#include "reflection/typecast.h"

#include "xcode_gtest_helper.h"

using reflection::Object;
using reflection::TypeCast;

using testing::Eq;
using testing::NotNull;

enum class Status { OK, BAD_INPUT, INTERNAL_ERROR };

std::string status_to_string(Status status) {
  switch (status) {
  case Status::OK:
    return "OK";
  case Status::BAD_INPUT:
    return "BAD";
  case Status::INTERNAL_ERROR:
    return "ERROR";
  }
}

Status status_from_string(std::string const & str) {
  if (str == "OK")
    return Status::OK;
  else if (str == "BAD")
    return Status::BAD_INPUT;
  else if (str == "ERROR")
    return Status::INTERNAL_ERROR;
  throw std::invalid_argument(str);
}

namespace reflection {
INSTANTIATE_REFLECTION_TYPECAST(Status);
REFLECTION_TYPE_CAST(Status).bind<int>().bind(&status_from_string,
                                              &status_to_string);
}

TEST(TypeCastTest, CanPerformTypeCoercion) {
  Object stat(Status::OK);

  EXPECT_THAT(Status(stat), Eq(Status::OK));
  EXPECT_THAT(int(stat), Eq(0));
  std::string str(stat);
  EXPECT_THAT(str, Eq("OK"));
}