ceph/src/boost/libs/stacktrace/example/throwing_st.cpp

   1 // Copyright Antony Polukhin, 2016-2019.
   2 //
   3 // Distributed under the Boost Software License, Version 1.0. (See
   4 // accompanying file LICENSE_1_0.txt or copy at
   5 // http://www.boost.org/LICENSE_1_0.txt)
   6
   7 #include <boost/config.hpp>
   8
   9 ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
  10
  11 //[getting_started_class_traced
  12 #include <boost/stacktrace.hpp>
  13 #include <boost/exception/all.hpp>
  14
  15 typedef boost::error_info<struct tag_stacktrace, boost::stacktrace::stacktrace> traced;
  16 //]
  17
  18 //[getting_started_class_with_trace
  19 template <class E>
  20 void throw_with_trace(const E& e) {
  21     throw boost::enable_error_info(e)
  22         << traced(boost::stacktrace::stacktrace());
  23 }
  24 //]
  25
  26 ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
  27
  28 BOOST_NOINLINE void oops(int i);
  29 BOOST_NOINLINE void foo(int i);
  30 BOOST_NOINLINE void bar(int i);
  31
  32 #include <stdexcept>
  33 BOOST_NOINLINE void oops(int i) {
  34     //[getting_started_throwing_with_trace
  35     if (i >= 4)
  36         throw_with_trace(std::out_of_range("'i' must be less than 4 in oops()"));
  37     if (i <= 0)
  38         throw_with_trace(std::logic_error("'i' must be greater than zero in oops()"));
  39     //]
  40     foo(i);
  41     std::exit(1);
  42 }
  43
  44 #include <boost/array.hpp>
  45 BOOST_NOINLINE void bar(int i) {
  46     boost::array<int, 5> a = {{0, 0, 0, 0, 0}};
  47     if (i < 5) {
  48         if (i >= 0) {
  49             foo(a[i]);
  50         } else {
  51             oops(i);
  52         }
  53     }
  54     std::exit(2);
  55 }
  56
  57 BOOST_NOINLINE void foo(int i) {
  58     bar(--i);
  59 }
  60
  61 #include <iostream>
  62 int main() {
  63
  64     //[getting_started_catching_trace
  65     try {
  66         foo(5); // testing assert handler
  67     } catch (const std::exception& e) {
  68         std::cerr << e.what() << '\n';
  69         const boost::stacktrace::stacktrace* st = boost::get_error_info<traced>(e);
  70         if (st) {
  71             std::cerr << *st << '\n'; /*<-*/ return 0; /*->*/
  72         } /*<-*/ return 3; /*->*/
  73     }
  74     //]
  75
  76     return 5;
  77 }
  78