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 #if __has_include(<version>) 17 #include <version> 18 #endif 19 20 #if defined(__cpp_lib_expected) && __cpp_lib_expected >= 202202L 21 // No polyfill for <expected>. 22 23 #include <expected> 24 25 namespace pw { 26 27 using std::expected; 28 using std::unexpect; 29 using std::unexpect_t; 30 using std::unexpected; 31 32 } // namespace pw 33 34 #else 35 // Provide polyfill for <expected>. 36 37 #include "pw_result/internal/expected_impl.h" 38 39 namespace pw { 40 41 using internal::expected; 42 using internal::unexpect; 43 using internal::unexpect_t; 44 using internal::unexpected; 45 46 } // namespace pw 47 48 #endif // defined(__cpp_lib_expected) && __cpp_lib_expected >= 202202L 49