1 // Copyright 2020 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 <iterator> 17 18 #include "pw_polyfill/standard_library/namespace.h" 19 20 // Define std::data and std::size. 21 #ifndef __cpp_lib_nonmember_container_access 22 #define __cpp_lib_nonmember_container_access 201411L 23 24 #include <cstddef> 25 26 _PW_POLYFILL_BEGIN_NAMESPACE_STD 27 28 template <typename C> 29 constexpr auto data(C& container) -> decltype(container.data()) { 30 return container.data(); 31 } 32 33 template <typename C> 34 constexpr auto data(const C& container) -> decltype(container.data()) { 35 return container.data(); 36 } 37 38 template <typename T, size_t kSize> data(T (& array)[kSize])39constexpr T* data(T (&array)[kSize]) noexcept { 40 return array; 41 } 42 43 template <typename C> 44 constexpr auto size(const C& container) -> decltype(container.size()) { 45 return container.size(); 46 } 47 48 template <typename T, size_t kSize> size(const T (&)[kSize])49constexpr size_t size(const T (&)[kSize]) noexcept { 50 return kSize; 51 } 52 53 _PW_POLYFILL_END_NAMESPACE_STD 54 55 #endif // __cpp_lib_nonmember_container_access 56