ceph/src/boost/boost/stacktrace/detail/void_ptr_cast.hpp

   1 // Copyright 2014 Renato Tegon Forti, Antony Polukhin.
   2 // Copyright 2015-2019 Antony Polukhin.
   3 //
   4 // Distributed under the Boost Software License, Version 1.0.
   5 // (See accompanying file LICENSE_1_0.txt
   6 // or copy at http://www.boost.org/LICENSE_1_0.txt)
   7
   8 #ifndef BOOST_STACKTRACE_DETAIL_VOID_PTR_CAST_HPP
   9 #define BOOST_STACKTRACE_DETAIL_VOID_PTR_CAST_HPP
  10
  11 #include <boost/config.hpp>
  12 #ifdef BOOST_HAS_PRAGMA_ONCE
  13 #   pragma once
  14 #endif
  15
  16 #include <boost/static_assert.hpp>
  17 #include <boost/type_traits/is_pointer.hpp>
  18
  19 #if defined(__GNUC__) && defined(__GNUC_MINOR__) && (__GNUC__ * 100 + __GNUC_MINOR__ > 301)
  20 #   pragma GCC system_header
  21 #endif
  22
  23 namespace boost { namespace stacktrace { namespace detail {
  24
  25 // GCC warns when reinterpret_cast between function pointer and object pointer occur.
  26 // This functionsuppress the warnings and ensures that such casts are safe.
  27 template <class To, class From>
  28 To void_ptr_cast(From* v) BOOST_NOEXCEPT {
  29     BOOST_STATIC_ASSERT_MSG(
  30         boost::is_pointer<To>::value,
  31         "`void_ptr_cast` function must be used only for casting to or from void pointers."
  32     );
  33
  34     BOOST_STATIC_ASSERT_MSG(
  35         sizeof(From*) == sizeof(To),
  36         "Pointer to function and pointer to object differ in size on your platform."
  37     );
  38
  39     return reinterpret_cast<To>(v);
  40 }
  41
  42
  43 }}} // boost::stacktrace::detail
  44
  45 #endif // BOOST_STACKTRACE_DETAIL_VOID_PTR_CAST_HPP
  46