1// Copyright 2018 The RE2 Authors. All Rights Reserved.
2// Use of this source code is governed by a BSD-style
3// license that can be found in the LICENSE file.
4
5#ifndef UTIL_POD_ARRAY_H_
6#define UTIL_POD_ARRAY_H_
7
8#include <memory>
9#include <type_traits>
10
11namespace re2 {
12
13template <typename T>
14class PODArray {
15 public:
16 static_assert(std::is_pod<T>::value,
17 "T must be POD");
18
19 PODArray()
20 : ptr_() {}
21 explicit PODArray(int len)
22 : ptr_(std::allocator<T>().allocate(len), Deleter(len)) {}
23
24 T* data() const {
25 return ptr_.get();
26 }
27
28 int size() const {
29 return ptr_.get_deleter().len_;
30 }
31
32 T& operator[](int pos) const {
33 return ptr_[pos];
34 }
35
36 private:
37 struct Deleter {
38 Deleter()
39 : len_(0) {}
40 explicit Deleter(int len)
41 : len_(len) {}
42
43 void operator()(T* ptr) const {
44 std::allocator<T>().deallocate(ptr, len_);
45 }
46
47 int len_;
48 };
49
50 std::unique_ptr<T[], Deleter> ptr_;
51};
52
53} // namespace re2
54
55#endif // UTIL_POD_ARRAY_H_
56