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

   1 // Copyright (c) 2018-2020 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 #include <boost/leaf/on_error.hpp>
   7 #include <boost/leaf/handle_errors.hpp>
   8 #include <boost/leaf/result.hpp>
   9 #include "lightweight_test.hpp"
  10
  11 namespace leaf = boost::leaf;
  12
  13 struct info { int value; };
  14
  15 leaf::result<void> g1()
  16 {
  17     auto load = leaf::on_error( info{1} );
  18     return { };
  19 }
  20
  21 leaf::result<void> g2()
  22 {
  23     return leaf::new_error();
  24 }
  25
  26 leaf::result<void> f()
  27 {
  28     auto load = leaf::on_error( info{2} );
  29     BOOST_LEAF_CHECK(g1());
  30     return g2();
  31 }
  32
  33 int main()
  34 {
  35     int r = leaf::try_handle_all(
  36         []() -> leaf::result<int>
  37         {
  38             BOOST_LEAF_CHECK(f());
  39             return 1;
  40         },
  41         []( info x )
  42         {
  43             BOOST_TEST_EQ(x.value, 2);
  44             return 2;
  45         },
  46         []
  47         {
  48             return 3;
  49          } );
  50     BOOST_TEST_EQ(r, 2);
  51
  52     return boost::report_errors();
  53 }