ceph/src/boost/libs/leaf/test/result_implicit_conversion_test.cpp

   1 // Copyright 2018-2022 Emil Dotchevski and Reverge Studios, Inc.
   2
   3 // Distributed under the Boost Software License, Version 1.0. (See accompanying
   4 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   5
   6 #ifdef BOOST_LEAF_TEST_SINGLE_HEADER
   7 #   include "leaf.hpp"
   8 #else
   9 #   include <boost/leaf/result.hpp>
  10 #endif
  11
  12 #include "lightweight_test.hpp"
  13
  14 namespace leaf = boost::leaf;
  15
  16 struct A
  17 {
  18     int x;
  19     A() noexcept:
  20         x(0)
  21     {
  22     }
  23
  24     A( int x ) noexcept:
  25         x(x)
  26     {
  27     }
  28 };
  29
  30 leaf::result<int> f()
  31 {
  32     return 42;
  33 }
  34
  35 leaf::result<A> g()
  36 {
  37     return f();
  38 }
  39
  40 int main()
  41 {
  42     BOOST_TEST_EQ(g().value().x, 42);
  43     {
  44         leaf::result<int> r1(42);
  45         leaf::result<A> r2(std::move(r1));
  46         BOOST_TEST_EQ(r2.value().x, 42);
  47     }
  48     {
  49         leaf::result<int> r1(42);
  50         leaf::result<A> r2;
  51         r2 = std::move(r1);
  52         BOOST_TEST_EQ(r2.value().x, 42);
  53     }
  54     return boost::report_errors();
  55 }