1 /*
2  * Copyright (c) Facebook, Inc. and its affiliates.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *     http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #pragma once
18 
19 #include <string>
20 
21 #include <boost/regex/pending/unicode_iterator.hpp>
22 
23 #include <folly/Range.h>
24 
25 namespace folly {
26 
27 template <
28     class Iterator = const char*,
29     class Base = folly::Range<boost::u8_to_u32_iterator<Iterator>>>
30 class UTF8Range : public Base {
31  public:
UTF8Range(const folly::Range<Iterator> baseRange)32   /* implicit */ UTF8Range(const folly::Range<Iterator> baseRange)
33       : Base(
34             boost::u8_to_u32_iterator<Iterator>(
35                 baseRange.begin(), baseRange.begin(), baseRange.end()),
36             boost::u8_to_u32_iterator<Iterator>(
37                 baseRange.end(), baseRange.begin(), baseRange.end())) {}
UTF8Range(const std::string & baseString)38   /* implicit */ UTF8Range(const std::string& baseString)
39       : Base(folly::Range<Iterator>(baseString)) {}
40 };
41 
42 using UTF8StringPiece = UTF8Range<const char*>;
43 
44 } // namespace folly
45