blob: 9e96c67f2a4c2508cd797e52dc37e2c397461c74 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
|
/*
* Copyright 2018 Google
*
* 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
*
* http://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.
*/
#ifndef FIRESTORE_CORE_SRC_FIREBASE_FIRESTORE_UTIL_RANGE_H_
#define FIRESTORE_CORE_SRC_FIREBASE_FIRESTORE_UTIL_RANGE_H_
#include <iterator>
#include <utility>
namespace firebase {
namespace firestore {
namespace util {
/**
* Adapts a pair of iterators into a range suitable for use with range-based
* for loops.
*/
template <typename Iterator>
class range {
public:
using value_type = typename std::iterator_traits<Iterator>::value_type;
using iterator = Iterator;
using const_iterator = Iterator;
/**
* Default range which constructs default begin and end pointers. For most
* implementations where the end pointer is a null pointer or some other
* default value, this ends up constructing the empty range.
*/
range() : begin_{}, end_{} {
}
/**
* Creates a half-open range starting from begin up to, but not including end.
*/
range(iterator&& begin, iterator&& end)
: begin_{std::move(begin)}, end_{std::move(end)} {
}
iterator begin() const {
return begin_;
}
iterator end() const {
return end_;
}
private:
Iterator begin_;
Iterator end_;
};
/**
* Creates ranges with type deduction.
*/
template <typename Iterator>
range<Iterator> make_range(Iterator begin, Iterator end) {
return range<Iterator>{std::move(begin), std::move(end)};
}
} // namespace util
} // namespace firestore
} // namespace firebase
#endif // FIRESTORE_CORE_SRC_FIREBASE_FIRESTORE_UTIL_RANGE_H_
|
