EQ2EMu/EQ2/source/depends/boost_1_72_0/libs/outcome/test/tests/issue0210.cpp

/* Unit testing for outcomes
(C) 2013-2019 Niall Douglas <http://www.nedproductions.biz/> (1 commit)


Boost Software License - Version 1.0 - August 17th, 2003

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*/

#include <boost/outcome/outcome.hpp>
#include <boost/outcome/try.hpp>
#include <boost/test/unit_test.hpp>
#include <boost/test/unit_test_monitor.hpp>

namespace issues210
{
  namespace outcome = BOOST_OUTCOME_V2_NAMESPACE;

  struct error
  {
    boost::system::error_code code;
  };

  // say that my custom error code type is error code compatible
  inline boost::system::error_code make_error_code(error error) noexcept { return error.code; }

  template <typename T> using custom_result = outcome::basic_result<T, error, outcome::policy::default_policy<T, error, void>>;

  // source of custom result type with error code compatible error type
  inline custom_result<int> funcA(int x) { return x; }

  // Is the custom result type explicitly constructible to an ordinary result type?
  inline outcome::result<int> funcB(int x) { return outcome::result<int>(funcA(x)); }

  // Does the custom result type TRY-convert to an ordinary result type?
  inline outcome::result<int> func1(int x)
  {
    BOOST_OUTCOME_TRY(y, funcA(x));
    return funcB(y);
  }

  // Is the custom result type explicitly constructible to an ordinary outcome type?
  inline outcome::outcome<int> funcC(int x) { return outcome::outcome<int>(funcA(x)); }

  // Does the custom result type TRY-convert to an ordinary outcome type?
  inline outcome::outcome<int> func2(int x)
  {
    BOOST_OUTCOME_TRY(y, funcA(x));
    return funcC(y);
  }
}  // namespace issues210


BOOST_OUTCOME_AUTO_TEST_CASE(issues_0210_test, "result<int, E> with error code compatible custom E does not TRY into a result<int, boost::system::error_code> function")
{
  BOOST_CHECK(issues210::func1(5).value() == 5);
  BOOST_CHECK(issues210::func2(5).value() == 5);
}