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 // pw::span is an implementation of std::span for C++17 or newer. The 16 // implementation is shared with the std::span polyfill class. 17 #pragma once 18 19 #include "pw_span/internal/config.h" 20 21 #if __has_include(<version>) 22 #include <version> 23 #endif // __has_include(<version>) 24 25 // If the C++ library fully supports <span>, pw::span is an alias of std::span, 26 // but only if PW_SPAN_ENABLE_ASSERTS is not enabled. 27 #if defined(__cpp_lib_span) && __cpp_lib_span >= 202002L && \ 28 !PW_SPAN_ENABLE_ASSERTS 29 30 #include <span> 31 32 namespace pw { 33 34 using std::as_bytes; 35 using std::as_writable_bytes; 36 using std::dynamic_extent; 37 using std::span; 38 39 } // namespace pw 40 41 #else 42 43 // If std::span is not available, use Pigweed's span implementation. 44 #include "pw_span/internal/span_impl.h" // IWYU pragma: export 45 46 #endif // defined(__cpp_lib_span) && __cpp_lib_span >= 202002L 47