ceph/src/boost/libs/core/test/uncaught_exceptions_np.cpp

   1 /*
   2  *             Copyright Andrey Semashev 2018.
   3  * Distributed under the Boost Software License, Version 1.0.
   4  *    (See accompanying file LICENSE_1_0.txt or copy at
   5  *          https://www.boost.org/LICENSE_1_0.txt)
   6  */
   7 /*!
   8  * \file   uncaught_exceptions_np.cpp
   9  * \author Andrey Semashev
  10  * \date   2018-11-10
  11  *
  12  * \brief  This file contains tests for the uncaught_exceptions function.
  13  *
  14  * This file contains checks that are compiler specific and not quite portable or require C++17.
  15  */
  16
  17 #include <boost/core/uncaught_exceptions.hpp>
  18
  19 #if !defined(BOOST_CORE_UNCAUGHT_EXCEPTIONS_EMULATED)
  20
  21 #include <boost/core/lightweight_test.hpp>
  22
  23 struct my_exception1 {};
  24 struct my_exception2 {};
  25
  26 class exception_watcher2
  27 {
  28     unsigned int& m_count;
  29
  30 public:
  31     explicit exception_watcher2(unsigned int& count) : m_count(count) {}
  32     ~exception_watcher2() { m_count = boost::core::uncaught_exceptions(); }
  33 };
  34
  35 class exception_watcher1
  36 {
  37     unsigned int& m_count1;
  38     unsigned int& m_count2;
  39
  40 public:
  41     exception_watcher1(unsigned int& count1, unsigned int& count2) : m_count1(count1), m_count2(count2) {}
  42     ~exception_watcher1()
  43     {
  44         m_count1 = boost::core::uncaught_exceptions();
  45         try
  46         {
  47             exception_watcher2 watcher2(m_count2);
  48             throw my_exception2();
  49         }
  50         catch (...)
  51         {
  52         }
  53     }
  54 };
  55
  56 // Tests for uncaught_exceptions when used in nested destructors while an exception propagates
  57 void test_in_nested_destructors()
  58 {
  59     const unsigned int root_count = boost::core::uncaught_exceptions();
  60
  61     unsigned int level1_count = root_count, level2_count = root_count;
  62     try
  63     {
  64         exception_watcher1 watcher1(level1_count, level2_count);
  65         throw my_exception1();
  66     }
  67     catch (...)
  68     {
  69     }
  70
  71     BOOST_TEST_NE(root_count, level1_count);
  72     BOOST_TEST_NE(root_count, level2_count);
  73     BOOST_TEST_NE(level1_count, level2_count);
  74 }
  75
  76 int main()
  77 {
  78     test_in_nested_destructors();
  79
  80     return boost::report_errors();
  81 }
  82
  83 #else
  84
  85 int main()
  86 {
  87     return 0;
  88 }
  89
  90 #endif