Boost C++ Libraries

boost/stacktrace/detail/void_ptr_cast.hpp

// Copyright 2014 Renato Tegon Forti, Antony Polukhin.
// Copyright 2015-2019 Antony Polukhin.
//
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt
// or copy at http://www.boost.org/LICENSE_1_0.txt)

#ifndef BOOST_STACKTRACE_DETAIL_VOID_PTR_CAST_HPP
#define BOOST_STACKTRACE_DETAIL_VOID_PTR_CAST_HPP

#include <boost/config.hpp>
#ifdef BOOST_HAS_PRAGMA_ONCE
#   pragma once
#endif

#include <boost/static_assert.hpp>
#include <boost/type_traits/is_pointer.hpp>

#if defined(__GNUC__) && defined(__GNUC_MINOR__) && (__GNUC__ * 100 + __GNUC_MINOR__ > 301)
#   pragma GCC system_header
#endif

namespace boost { namespace stacktrace { namespace detail {

// GCC warns when reinterpret_cast between function pointer and object pointer occur.
// This functionsuppress the warnings and ensures that such casts are safe.
template <class To, class From>
To void_ptr_cast(From* v) BOOST_NOEXCEPT {
    BOOST_STATIC_ASSERT_MSG(
        boost::is_pointer<To>::value,
        "`void_ptr_cast` function must be used only for casting to or from void pointers."
    );

    BOOST_STATIC_ASSERT_MSG(
        sizeof(From*) == sizeof(To),
        "Pointer to function and pointer to object differ in size on your platform."
    );

    return reinterpret_cast<To>(v);
}


}}} // boost::stacktrace::detail

#endif // BOOST_STACKTRACE_DETAIL_VOID_PTR_CAST_HPP