import quincy beta 17.1.0

[ceph.git] / ceph / src / boost / libs / outcome / test / tests / value-or-error.cpp

/* Unit testing for outcomes
(C) 2013-2020 Niall Douglas <http://www.nedproductions.biz/> (3 commits)


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

Permission is hereby granted, free of charge, to any person or organization
obtaining a copy of the software and accompanying documentation covered by
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the above license grant, this restriction and the following disclaimer,
must be included in all copies of the Software, in whole or in part, and
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FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
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*/

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

BOOST_OUTCOME_AUTO_TEST_CASE(works_outcome_valueorerror, "Tests that outcome constructs from value_or_error and value_or_none concept inputs")
{
  using namespace BOOST_OUTCOME_V2_NAMESPACE;
  {
    struct value_or_error
    {
      using value_type = int;
      using error_type = void;
      bool has_value() const { return true; }
      int value() const { return 78; }
      void error() const {}
    } a;
    static_assert(concepts::value_or_none<value_or_error>, "");
    static_assert(concepts::value_or_error<value_or_error>, "");
    static_assert(!concepts::basic_result<value_or_error>, "");
    static_assert(!concepts::basic_outcome<value_or_error>, "");
    BOOST_CHECK((convert::value_or_error<result<long>, value_or_error>{}(a).value() == 78));

    result<long> b(a);
    BOOST_CHECK(b.has_value());
    BOOST_CHECK(b.value() == 78);

    struct local_basic_result1 : result<int>
    {
    };
    static_assert(concepts::value_or_none<local_basic_result1>, "");
    static_assert(concepts::value_or_error<local_basic_result1>, "");
    static_assert(concepts::basic_result<result<int>>, "");
    static_assert(concepts::basic_result<local_basic_result1>, "");
    static_assert(!concepts::basic_outcome<result<int>>, "");
    static_assert(!concepts::basic_outcome<local_basic_result1>, "");

    struct local_basic_result2 : protected result<int>
    {
      using _base = result<int>;
      using value_type = _base::value_type;
      using error_type = _base::error_type;
      using _base::has_value;
      using _base::value;
      using _base::error;
    };
    static_assert(concepts::value_or_none<local_basic_result2>, "");
    static_assert(concepts::value_or_error<local_basic_result2>, "");
    static_assert(!concepts::basic_result<local_basic_result2>, "");
    static_assert(!concepts::basic_outcome<local_basic_result2>, "");

    struct local_basic_outcome1 : outcome<int>
    {
    };
    static_assert(!std::is_convertible<outcome<int>, result<int>>::value, "");
    static_assert(!std::is_convertible<local_basic_outcome1, result<int>>::value, "");
    static_assert(concepts::value_or_none<local_basic_outcome1>, "");
    static_assert(concepts::value_or_error<local_basic_outcome1>, "");
    static_assert(!concepts::basic_result<outcome<int>>, "");
    static_assert(!concepts::basic_result<local_basic_outcome1>, "");
    static_assert(concepts::basic_outcome<local_basic_outcome1>, "");

    struct local_basic_outcome2 : protected outcome<int>
    {
      using _base = outcome<int>;
      using value_type = _base::value_type;
      using error_type = _base::error_type;
      using exception_type = _base::exception_type;
      using _base::error;
      using _base::has_value;
      using _base::value;
    };
    static_assert(concepts::value_or_none<local_basic_outcome2>, "");
    static_assert(concepts::value_or_error<local_basic_outcome2>, "");
    static_assert(!concepts::basic_result<local_basic_outcome2>, "");
    static_assert(!concepts::basic_outcome<local_basic_outcome2>, "");
  }
}