Drizzled Public API Documentation

data_ref.h
1 /* Drizzle
2  * Copyright (C) 2011 Olaf van der Spek
3  *
4  * This program is free software: you can redistribute it and/or modify
5  * it under the terms of the GNU General Public License as published by
6  * the Free Software Foundation, either version 2 of the License, or
7  * (at your option) any later version.
8  *
9  * This program is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12  * GNU General Public License for more details.
13  *
14  * You should have received a copy of the GNU General Public License
15  * along with this program. If not, see <http://www.gnu.org/licenses/>.
16  */
17 
18 #pragma once
19 
20 #include <cstddef>
21 #include <cstring>
22 #include <ostream>
23 #include <string>
24 
25 template <class T>
27 {
28 public:
30  {
31  clear();
32  }
33 
34  template <class U>
35  data_ref_basic(const U& c)
36  {
37  assign(&*c.begin(), &*c.end());
38  }
39 
40  data_ref_basic(const void* b, const void* e)
41  {
42  assign(b, e);
43  }
44 
45  data_ref_basic(const void* b, size_t sz)
46  {
47  assign(b, sz);
48  }
49 
50  explicit data_ref_basic(const char* b)
51  {
52  assign(b, strlen(b));
53  }
54 
55  void clear()
56  {
57  begin_ = end_ = reinterpret_cast<T>("");
58  }
59 
60  void assign(const void* b, const void* e)
61  {
62  begin_ = reinterpret_cast<T>(b);
63  end_ = reinterpret_cast<T>(e);
64  }
65 
66  void assign(const void* b, size_t sz)
67  {
68  begin_ = reinterpret_cast<T>(b);
69  end_ = begin_ + sz;
70  }
71 
72  T begin() const
73  {
74  return begin_;
75  }
76 
77  T end() const
78  {
79  return end_;
80  }
81 
82  T data() const
83  {
84  return begin();
85  }
86 
87  size_t size() const
88  {
89  return end() - begin();
90  }
91 
92  bool empty() const
93  {
94  return begin() == end();
95  }
96 
97  operator std::string() const
98  {
99  return to_string(*this);
100  }
101 private:
102  T begin_;
103  T end_;
104 };
105 
108 
109 inline std::ostream& operator<<(std::ostream& os, str_ref v)
110 {
111  return os.write(v.data(), v.size());
112 }
113 
114 inline std::string to_string(str_ref v)
115 {
116  return std::string(v.data(), v.size());
117 }