mirror of https://github.com/axmolengine/axmol.git
79 lines
1.8 KiB
C++
79 lines
1.8 KiB
C++
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// Range v3 library
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//
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// Copyright Eric Niebler 2013-present
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//
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// Use, modification and distribution is subject to the
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// Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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// Project home: https://github.com/ericniebler/range-v3
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//
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#ifndef RANGES_V3_UTILITY_ADDRESSOF_HPP
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#define RANGES_V3_UTILITY_ADDRESSOF_HPP
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#include <memory>
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#include <type_traits>
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#include <concepts/concepts.hpp>
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#include <range/v3/range_fwd.hpp>
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#include <range/v3/detail/config.hpp>
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#include <range/v3/detail/prologue.hpp>
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namespace ranges
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{
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/// \cond
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namespace detail
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{
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#ifdef __cpp_lib_addressof_constexpr
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using std::addressof;
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#else
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namespace check_addressof
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{
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inline ignore_t operator&(ignore_t)
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{
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return {};
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}
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template<typename T>
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auto addressof(T & t)
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{
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return &t;
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}
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} // namespace check_addressof
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template<typename T>
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constexpr bool has_bad_addressof()
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{
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return !std::is_scalar<T>::value &&
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!RANGES_IS_SAME(decltype(check_addressof::addressof(*(T *)nullptr)),
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ignore_t);
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}
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template(typename T)(
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requires(has_bad_addressof<T>()))
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T * addressof(T & arg) noexcept
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{
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return std::addressof(arg);
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}
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template(typename T)(
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requires (!has_bad_addressof<T>()))
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constexpr T * addressof(T & arg) noexcept
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{
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return &arg;
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}
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template<typename T>
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T const * addressof(T const &&) = delete;
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#endif
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} // namespace detail
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/// \endcond
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} // namespace ranges
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#include <range/v3/detail/epilogue.hpp>
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#endif
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