1 // (C) Copyright John Maddock 2014-9.
2 // (C) Copyright Andrey Semashev 2017.
3 // Use, modification and distribution are subject to the
4 // Boost Software License, Version 1.0. (See accompanying file
5 // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
7 #include <boost/config.hpp>
9 int test_fallthrough(int n)
23 int test_unreachable(int i)
25 if(BOOST_LIKELY(i)) return i;
28 BOOST_UNREACHABLE_RETURN(0) // NOTE: no semicolon afterwards!!
31 BOOST_FORCEINLINE int always_inline(int i){ return ++i; }
32 BOOST_NOINLINE int never_inline(int i){ return ++i; }
34 BOOST_NORETURN void always_throw()
39 struct BOOST_MAY_ALIAS aliasing_struct {};
40 typedef unsigned int BOOST_MAY_ALIAS aliasing_uint;
42 struct BOOST_ATTRIBUTE_NODISCARD nodiscard_struct {};
45 #define test_fallthrough(x) foobar(x)
51 BOOST_ATTRIBUTE_NO_UNIQUE_ADDRESS empty b;
57 typedef int unused_type BOOST_ATTRIBUTE_UNUSED;
60 int result = test_fallthrough BOOST_PREVENT_MACRO_SUBSTITUTION(0);
61 BOOST_STATIC_CONSTANT(bool, value = 0);
62 result += test_unreachable(1);
63 result += always_inline(2);
64 result += never_inline(3);
65 if(BOOST_UNLIKELY(!result))