ceph/src/boost/libs/leaf/test/defer_basic_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 #include <sstream>
  11
  12 namespace leaf = boost::leaf;
  13
  14 int global;
  15
  16 int get_global() noexcept
  17 {
  18     return global;
  19 }
  20
  21 template <int>
  22 struct info
  23 {
  24     int value;
  25 };
  26
  27 leaf::error_id g()
  28 {
  29     global = 0;
  30     auto load = leaf::on_error( []{ return info<42>{get_global()}; }, []{ return info<-42>{-42}; } );
  31     global = 42;
  32     return leaf::new_error();
  33 }
  34
  35 leaf::error_id f()
  36 {
  37     return g();
  38 }
  39
  40 int main()
  41 {
  42     int r = leaf::try_handle_all(
  43         []() -> leaf::result<int>
  44         {
  45             return f();
  46         },
  47         []( info<42> const & i42, leaf::diagnostic_info const & di )
  48         {
  49             BOOST_TEST_EQ(i42.value, 42);
  50             std::stringstream ss; ss << di;
  51             std::string s = ss.str();
  52             std::cout << s;
  53 #if BOOST_LEAF_DIAGNOSTICS
  54             BOOST_TEST(s.find("info<-42>")!=s.npos);
  55 #else
  56             BOOST_TEST(s.find("BOOST_LEAF_DIAGNOSTICS")!=s.npos);
  57 #endif
  58             return 1;
  59         },
  60         []
  61         {
  62             return 2;
  63         } );
  64     BOOST_TEST_EQ(r, 1);
  65     return boost::report_errors();
  66 }