ceph/src/boost/libs/config/test/helper_macro_test.cpp

   1 //  Use, modification and distribution are subject to the
   2 //  Boost Software License, Version 1.0. (See accompanying file
   3 //  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   4
   5 #include <boost/config.hpp>
   6
   7 int test_fallthrough(int n)
   8 {
   9    switch (n)
  10    {
  11    case 0:
  12       n++;
  13       BOOST_FALLTHROUGH;
  14    case 1:
  15       n++;
  16       break;
  17    }
  18    return n;
  19 }
  20
  21 int test_unreachable(int i)
  22 {
  23    if(BOOST_LIKELY(i)) return i;
  24
  25    throw i;
  26    BOOST_UNREACHABLE_RETURN(0);
  27 }
  28
  29 BOOST_FORCEINLINE int always_inline(int i){ return ++i; }
  30 BOOST_NOINLINE int never_inline(int i){ return ++i; }
  31
  32 BOOST_NORETURN void always_throw()
  33 {
  34    throw 0;
  35 }
  36
  37 struct BOOST_MAY_ALIAS aliasing_struct {};
  38 typedef unsigned int BOOST_MAY_ALIAS aliasing_uint;
  39
  40
  41 #define test_fallthrough(x) foobar(x)
  42
  43
  44 int main()
  45 {
  46    typedef int unused_type BOOST_ATTRIBUTE_UNUSED;
  47    try
  48    {
  49       int result = test_fallthrough BOOST_PREVENT_MACRO_SUBSTITUTION(0);
  50       BOOST_STATIC_CONSTANT(bool, value = 0);
  51       result += test_unreachable(1);
  52       result += always_inline(2);
  53       result += never_inline(3);
  54       if(BOOST_UNLIKELY(!result))
  55          always_throw();
  56    }
  57    catch(int)
  58    {
  59       return 1;
  60    }
  61    return 0;
  62 }
  63