EQ2EMu/EQ2/source/depends/boost_1_72_0/libs/outcome/test/tests/issue0010.cpp

/* Unit testing for outcomes
(C) 2013-2019 Niall Douglas <http://www.nedproductions.biz/> (9 commits)


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

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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(issues_0010_test, "Expected's operator->(), operator*() and .error() throw exceptions when they should not")
{
  using namespace BOOST_OUTCOME_V2_NAMESPACE;
  const char *a = "hi", *b = "bye";
  struct udt1  // NOLINT
  {
    const char *_v{nullptr};
    udt1() = default;
    constexpr explicit udt1(const char *v) noexcept : _v(v) {}
    constexpr udt1(udt1 &&o) noexcept : _v(o._v) { o._v = nullptr; }
    udt1(const udt1 &) = default;
    constexpr udt1 &operator=(udt1 &&o) noexcept
    {
      _v = o._v;
      o._v = nullptr;
      return *this;
    }
    udt1 &operator=(const udt1 &) = delete;
    constexpr const char *operator*() const noexcept { return _v; }
  };
  struct udt2  // NOLINT
  {
    const char *_v{nullptr};
    udt2() = default;
    constexpr explicit udt2(const char *v) noexcept : _v(v) {}
    constexpr udt2(udt2 &&o) noexcept : _v(o._v) { o._v = nullptr; }
    udt2(const udt2 &) = default;
    constexpr udt2 &operator=(udt2 &&o) noexcept
    {
      _v = o._v;
      o._v = nullptr;
      return *this;
    }
    udt1 &operator=(const udt1 &) = delete;
    constexpr const char *operator*() const noexcept { return _v; }
  };
  result<udt1, udt2> p(udt1{a});
  result<udt1, udt2> n(udt2{b});
  // State check
  BOOST_CHECK(p.has_value());
  BOOST_CHECK(!n.has_value());
  // These should behave as expected (!)
  // BOOST_CHECK_NO_THROW(p.value());
  // BOOST_CHECK_NO_THROW(n.value());
  // And state is not destroyed
  BOOST_CHECK(p.has_value() && *p.assume_value() == a);
  BOOST_CHECK(!n.has_value() && *n.assume_error() == b);
  // LEWG Expected provides rvalue ref semantics for operator*(), error() and error_or()
  udt1 a1(std::move(p.assume_value()));
  BOOST_CHECK(*a1 == a);
  BOOST_CHECK(*p.assume_value() == nullptr);
  udt2 e2(std::move(n).assume_error());
  BOOST_CHECK(*e2 == b);
  BOOST_CHECK(*n.assume_error() == nullptr);  // NOLINT
}