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/*
Copyright (C) 2002 Brad King (brad.king@kitware.com)
                   Douglas Gregor (gregod@cs.rpi.edu)

Copyright (C) 2002, 2008, 2013 Peter Dimov

Copyright (C) 2017 Glen Joseph Fernandes (glenjofe@gmail.com)

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_CORE_ADDRESSOF_HPP
#define BOOST_CORE_ADDRESSOF_HPP

#include <boost/config.hpp>

#if defined(BOOST_MSVC_FULL_VER) && BOOST_MSVC_FULL_VER >= 190024215
#define BOOST_CORE_HAS_BUILTIN_ADDRESSOF
#elif defined(BOOST_GCC) && BOOST_GCC >= 70000
#define BOOST_CORE_HAS_BUILTIN_ADDRESSOF
#elif defined(__has_builtin)
#if __has_builtin(__builtin_addressof)
#define BOOST_CORE_HAS_BUILTIN_ADDRESSOF
#endif
#endif

#if defined(BOOST_CORE_HAS_BUILTIN_ADDRESSOF)
#if defined(BOOST_NO_CXX11_CONSTEXPR)
#define BOOST_CORE_NO_CONSTEXPR_ADDRESSOF
#endif

namespace boost {

template<class T>
BOOST_CONSTEXPR inline T*
addressof(T& o) BOOST_NOEXCEPT
{
    return __builtin_addressof(o);
}

} /* boost */
#else
#include <boost/config/workaround.hpp>
#include <cstddef>

namespace boost {
namespace detail {

template<class T>
class addrof_ref {
public:
    BOOST_FORCEINLINE addrof_ref(T& o) BOOST_NOEXCEPT
        : o_(o) { }
    BOOST_FORCEINLINE operator T&() const BOOST_NOEXCEPT {
        return o_;
    }
private:
    addrof_ref& operator=(const addrof_ref&);
    T& o_;
};

template<class T>
struct addrof {
    static BOOST_FORCEINLINE T* get(T& o, long) BOOST_NOEXCEPT {
        return reinterpret_cast<T*>(&
            const_cast<char&>(reinterpret_cast<const volatile char&>(o)));
    }
    static BOOST_FORCEINLINE T* get(T* p, int) BOOST_NOEXCEPT {
        return p;
    }
};

#if !defined(BOOST_NO_CXX11_NULLPTR)
#if !defined(BOOST_NO_CXX11_DECLTYPE) && \
    (defined(__INTEL_COMPILER) || \
        (defined(__clang__) && !defined(_LIBCPP_VERSION)))
typedef decltype(nullptr) addrof_null_t;