1 /*
2  * Copyright (C) 2017 The Android Open Source Project
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 "common.h"
20 
21 #include <stdlib.h>
22 
23 namespace slicer {
24 
25 // A shallow array view
26 template <class T>
27 class ArrayView {
28  public:
29   ArrayView() = default;
30 
31   ArrayView(const ArrayView&) = default;
32   ArrayView& operator=(const ArrayView&) = default;
33 
ArrayView(T * ptr,size_t count)34   ArrayView(T* ptr, size_t count) : begin_(ptr), end_(ptr + count) {}
35 
begin()36   T* begin() const { return begin_; }
end()37   T* end() const { return end_; }
38 
data()39   T* data() const { return begin_; }
40 
41   T& operator[](size_t i) const {
42     SLICER_CHECK(i < size());
43     return *(begin_ + i);
44   }
45 
size()46   size_t size() const { return end_ - begin_; }
empty()47   bool empty() const { return begin_ == end_; }
48 
49  private:
50   T* begin_ = nullptr;
51   T* end_ = nullptr;
52 };
53 
54 } // namespace slicer
55 
56