ceph/src/boost/libs/leaf/test/preload_nested_error_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 template <int>
  14 struct info
  15 {
  16     int value;
  17 };
  18
  19 leaf::error_id f0()
  20 {
  21     auto load = leaf::on_error(info<0>{});
  22     return leaf::new_error( info<2>{2} );
  23 }
  24
  25 leaf::error_id f1()
  26 {
  27     auto load = leaf::on_error( info<0>{-1}, info<1>{1}, info<2>{-1} );
  28     return f0();
  29 }
  30
  31 leaf::error_id f2()
  32 {
  33     return f1().load( info<3>{3} );
  34 }
  35
  36 int main()
  37 {
  38     int r = leaf::try_handle_all(
  39         []() -> leaf::result<int>
  40         {
  41             return f2();
  42         },
  43         []( info<0> i0, info<1> i1, info<2> i2, info<3> i3 )
  44         {
  45             BOOST_TEST_EQ(i0.value, 0);
  46             BOOST_TEST_EQ(i1.value, 1);
  47             BOOST_TEST_EQ(i2.value, 2);
  48             BOOST_TEST_EQ(i3.value, 3);
  49             return 1;
  50         },
  51         []
  52         {
  53             return 2;
  54         } );
  55     BOOST_TEST_EQ(r, 1);
  56
  57     return boost::report_errors();
  58 }