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// Copyright 2020 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef BASE_UTIL_RANGES_ITERATOR_H_
#define BASE_UTIL_RANGES_ITERATOR_H_
#include <iterator>
namespace util {
namespace ranges {
// Simplified implementation of C++20's std::ranges::begin.
// As opposed to std::ranges::begin, this implementation does not prefer a
// member begin() over a free standing begin(), does not check whether begin()
// returns an iterator, does not inhibit ADL and is not constexpr.
//
// Reference: https://wg21.link/range.access.begin
template <typename Range>
decltype(auto) begin(Range&& range) {
using std::begin;
return begin(std::forward<Range>(range));
}
// Simplified implementation of C++20's std::ranges::end.
// As opposed to std::ranges::end, this implementation does not prefer a
// member end() over a free standing end(), does not check whether end()
// returns an iterator, does not inhibit ADL and is not constexpr.
//
// Reference: - https://wg21.link/range.access.end
template <typename Range>
decltype(auto) end(Range&& range) {
using std::end;
return end(std::forward<Range>(range));
}
} // namespace ranges
} // namespace util
#endif // BASE_UTIL_RANGES_ITERATOR_H_
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