ceph/src/boost/libs/leaf/test/preload_nested_new_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 A>
  14 struct info
  15 {
  16     int value;
  17 };
  18
  19 leaf::error_id f0()
  20 {
  21     auto load = leaf::on_error( info<0>{-1} );
  22     return leaf::new_error( info<1>{-1} );
  23 }
  24
  25 leaf::error_id f1()
  26 {
  27     auto load = leaf::on_error(info<0>{}, info<1>{1}, info<2>{2} );
  28     (void) f0();
  29     return leaf::new_error();
  30 }
  31
  32 leaf::error_id f2()
  33 {
  34     return f1().load( info<3>{3} );
  35 }
  36
  37 int main()
  38 {
  39     int r = leaf::try_handle_all(
  40         []() -> leaf::result<int>
  41         {
  42             return f2();
  43         },
  44         []( info<0> i0, info<1> i1, info<2> i2, info<3> i3 )
  45         {
  46             BOOST_TEST_EQ(i0.value, 0);
  47             BOOST_TEST_EQ(i1.value, 1);
  48             BOOST_TEST_EQ(i2.value, 2);
  49             BOOST_TEST_EQ(i3.value, 3);
  50             return 1;
  51         },
  52         []
  53         {
  54             return 2;
  55         } );
  56     BOOST_TEST_EQ(r, 1);
  57
  58     return boost::report_errors();
  59 }