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Telegram/ThirdParty/range-v3/include/range/v3/utility/addressof.hpp

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+// 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