afb81b8278
Some checks failed
Docker. / Ubuntu (push) Has been cancelled
User-agent updater. / User-agent (push) Failing after 15s
Lock Threads / lock (push) Failing after 10s
Waiting for answer. / waiting-for-answer (push) Failing after 22s
Needs user action. / needs-user-action (push) Failing after 8s
Can't reproduce. / cant-reproduce (push) Failing after 8s
Close stale issues and PRs / stale (push) Has been cancelled
79 lines
1.8 KiB
C++
79 lines
1.8 KiB
C++
// Range v3 library
|
|
//
|
|
// Copyright Eric Niebler 2013-present
|
|
//
|
|
// Use, modification and distribution is subject to 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)
|
|
//
|
|
// Project home: https://github.com/ericniebler/range-v3
|
|
//
|
|
#ifndef RANGES_V3_UTILITY_ADDRESSOF_HPP
|
|
#define RANGES_V3_UTILITY_ADDRESSOF_HPP
|
|
|
|
#include <memory>
|
|
#include <type_traits>
|
|
|
|
#include <concepts/concepts.hpp>
|
|
|
|
#include <range/v3/range_fwd.hpp>
|
|
|
|
#include <range/v3/detail/config.hpp>
|
|
|
|
#include <range/v3/detail/prologue.hpp>
|
|
|
|
namespace ranges
|
|
{
|
|
/// \cond
|
|
namespace detail
|
|
{
|
|
#ifdef __cpp_lib_addressof_constexpr
|
|
using std::addressof;
|
|
#else
|
|
namespace check_addressof
|
|
{
|
|
inline ignore_t operator&(ignore_t)
|
|
{
|
|
return {};
|
|
}
|
|
template<typename T>
|
|
auto addressof(T & t)
|
|
{
|
|
return &t;
|
|
}
|
|
} // namespace check_addressof
|
|
|
|
template<typename T>
|
|
constexpr bool has_bad_addressof()
|
|
{
|
|
return !std::is_scalar<T>::value &&
|
|
!RANGES_IS_SAME(decltype(check_addressof::addressof(*(T *)nullptr)),
|
|
ignore_t);
|
|
}
|
|
|
|
template(typename T)(
|
|
requires(has_bad_addressof<T>()))
|
|
T * addressof(T & arg) noexcept
|
|
{
|
|
return std::addressof(arg);
|
|
}
|
|
|
|
template(typename T)(
|
|
requires (!has_bad_addressof<T>()))
|
|
constexpr T * addressof(T & arg) noexcept
|
|
{
|
|
return &arg;
|
|
}
|
|
|
|
template<typename T>
|
|
T const * addressof(T const &&) = delete;
|
|
#endif
|
|
} // namespace detail
|
|
/// \endcond
|
|
} // namespace ranges
|
|
|
|
#include <range/v3/detail/epilogue.hpp>
|
|
|
|
#endif
|