// Copyright 2020 The Pigweed Authors
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy of
// the License at
//
//     https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.
#pragma once

#if __has_include(<version>)
#include <version>
#endif  // __has_include(<version>)

// We are using <span> only if we were able to fetch __cpp_lib_span from
// <version> and it is at least 202002. In all other cases we are using
// custom span implementation.
#if defined(__cpp_lib_span) && __cpp_lib_span >= 202002L
#include_next <span>
#else
#undef __cpp_lib_span
#include "pw_span/internal/span_polyfill.h"
#endif  // defined(__cpp_lib_span) && __cpp_lib_span >= 202002L