github.com/searKing/golang/go@v1.2.117/os/signal/cgo/include/boost/stacktrace/detail/void_ptr_cast.hpp (about)

     1  // Copyright 2014 Renato Tegon Forti, Antony Polukhin.
     2  // Copyright Antony Polukhin, 2015-2023.
     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 <type_traits>
    17  
    18  #if defined(__GNUC__) && defined(__GNUC_MINOR__) && (__GNUC__ * 100 + __GNUC_MINOR__ > 301)
    19  #   pragma GCC system_header
    20  #endif
    21  
    22  namespace boost { namespace stacktrace { namespace detail {
    23  
    24  // GCC warns when reinterpret_cast between function pointer and object pointer occur.
    25  // This functionsuppress the warnings and ensures that such casts are safe.
    26  template <class To, class From>
    27  To void_ptr_cast(From* v) noexcept {
    28      static_assert(
    29          std::is_pointer<To>::value,
    30          "`void_ptr_cast` function must be used only for casting to or from void pointers."
    31      );
    32  
    33      static_assert(
    34          sizeof(From*) == sizeof(To),
    35          "Pointer to function and pointer to object differ in size on your platform."
    36      );
    37  
    38      return reinterpret_cast<To>(v);
    39  }
    40  
    41  
    42  }}} // boost::stacktrace::detail
    43  
    44  #endif // BOOST_STACKTRACE_DETAIL_VOID_PTR_CAST_HPP
    45