ceph/src/boost/libs/leaf/test/defer_basic_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/on_error.hpp>
  10 #   include <boost/leaf/handle_errors.hpp>
  11 #   include <boost/leaf/result.hpp>
  12 #endif
  13
  14 #include "lightweight_test.hpp"
  15 #include <sstream>
  16
  17 namespace leaf = boost::leaf;
  18
  19 int global;
  20
  21 int get_global() noexcept
  22 {
  23     return global;
  24 }
  25
  26 template <int>
  27 struct info
  28 {
  29     int value;
  30 };
  31
  32 leaf::error_id g()
  33 {
  34     global = 0;
  35     auto load = leaf::on_error( []{ return info<42>{get_global()}; }, []{ return info<-42>{-42}; } );
  36     global = 42;
  37     return leaf::new_error();
  38 }
  39
  40 leaf::error_id f()
  41 {
  42     return g();
  43 }
  44
  45 int main()
  46 {
  47     int r = leaf::try_handle_all(
  48         []() -> leaf::result<int>
  49         {
  50             return f();
  51         },
  52         []( info<42> const & i42, leaf::diagnostic_info const & di )
  53         {
  54             BOOST_TEST_EQ(i42.value, 42);
  55 #if BOOST_LEAF_CFG_STD_STRING
  56             std::stringstream ss; ss << di;
  57             std::string s = ss.str();
  58             std::cout << s;
  59 #if BOOST_LEAF_CFG_DIAGNOSTICS
  60             BOOST_TEST(s.find("info<-42>")!=s.npos);
  61 #else
  62             BOOST_TEST(s.find("BOOST_LEAF_CFG_DIAGNOSTICS")!=s.npos);
  63 #endif
  64 #endif
  65             return 1;
  66         },
  67         []
  68         {
  69             return 2;
  70         } );
  71     BOOST_TEST_EQ(r, 1);
  72     return boost::report_errors();
  73 }