1 // Copyright 2022 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 15 // Features from the <bit> header introduced in C++20. 16 #pragma once 17 18 #if __has_include(<bit>) 19 #include <bit> 20 #endif // __has_include(<bit>) 21 22 namespace pw { 23 24 #ifdef __cpp_lib_endian 25 26 using std::endian; 27 28 #elif defined(__GNUC__) 29 30 enum class endian { 31 little = __ORDER_LITTLE_ENDIAN__, 32 big = __ORDER_BIG_ENDIAN__, 33 native = __BYTE_ORDER__, 34 }; 35 36 #else 37 38 static_assert(false, 39 "The pw::endian enum is not defined for this compiler. Add a " 40 "definition to pw_bytes/bit.h."); 41 42 #endif // __cpp_lib_endian 43 44 } // namespace pw 45