1 // Copyright 2023 The Pigweed Authors 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); you may not 4 // use this file except in compliance with the License. You may obtain a copy of 5 // the License at 6 // 7 // https://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT 11 // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the 12 // License for the specific language governing permissions and limitations under 13 // the License. 14 #pragma once 15 16 #include "pw_polyfill/standard_library/namespace.h" 17 18 _PW_POLYFILL_BEGIN_NAMESPACE_STD 19 20 template <typename T> addressof(T & arg)21T* addressof(T& arg) noexcept { 22 return reinterpret_cast<T*>( 23 const_cast<char*>(reinterpret_cast<const volatile char*>(&arg))); 24 } 25 26 template <typename T> 27 T* addressof(T&& arg) = delete; 28 29 template <typename T> 30 struct pointer_traits; 31 32 template <typename T> 33 struct pointer_traits<T*> { 34 using pointer = T*; 35 using element_type = T; 36 using difference_type = decltype((const char*)1 - (const char*)1); 37 }; 38 39 _PW_POLYFILL_END_NAMESPACE_STD 40