57 lines
1.7 KiB
C++
57 lines
1.7 KiB
C++
/*
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <string>
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#include <boost/regex/pending/unicode_iterator.hpp>
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#include <folly/Range.h>
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namespace folly {
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class UTF8StringPiece {
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public:
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using iterator = boost::u8_to_u32_iterator<const char*>;
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using size_type = std::size_t;
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/* implicit */ UTF8StringPiece(const folly::StringPiece piece)
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: begin_{piece.begin(), piece.begin(), piece.end()},
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end_{piece.end(), piece.begin(), piece.end()} {}
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template <
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typename T,
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std::enable_if_t<std::is_convertible_v<T, folly::StringPiece>, int> = 0>
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/* implicit */ UTF8StringPiece(const T& t)
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: UTF8StringPiece(folly::StringPiece(t)) {}
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iterator begin() const noexcept { return begin_; }
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iterator cbegin() const noexcept { return begin_; }
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iterator end() const noexcept { return end_; }
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iterator cend() const noexcept { return end_; }
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bool empty() const noexcept { return begin_ == end_; }
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size_type walk_size() const {
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return static_cast<size_type>(std::distance(begin_, end_));
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}
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private:
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iterator begin_;
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iterator end_;
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};
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} // namespace folly
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