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
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
|
/*
* Copyright (C) 2015 Max Kellermann <max.kellermann@gmail.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef ALLOCATED_STRING_HXX
#define ALLOCATED_STRING_HXX
#include "StringPointer.hxx"
#include <utility>
#include <algorithm>
/**
* A string pointer whose memory is managed by this class.
*
* Unlike std::string, this object can hold a "nullptr" special value.
*/
template<typename T=char>
class AllocatedString {
public:
typedef typename StringPointer<T>::value_type value_type;
typedef typename StringPointer<T>::reference_type reference_type;
typedef typename StringPointer<T>::const_reference_type const_reference_type;
typedef typename StringPointer<T>::pointer_type pointer_type;
typedef typename StringPointer<T>::const_pointer_type const_pointer_type;
typedef size_t size_type;
static constexpr value_type SENTINEL = '\0';
private:
pointer_type value;
explicit AllocatedString(pointer_type _value)
:value(_value) {}
public:
AllocatedString(std::nullptr_t n):value(n) {}
AllocatedString(AllocatedString &&src)
:value(src.Steal()) {}
~AllocatedString() {
delete[] value;
}
static AllocatedString Donate(pointer_type value) {
return AllocatedString(value);
}
static AllocatedString Null() {
return nullptr;
}
static AllocatedString Empty() {
auto p = new value_type[1];
p[0] = SENTINEL;
return Donate(p);
}
static AllocatedString Duplicate(const_pointer_type src);
static AllocatedString Duplicate(const_pointer_type begin,
const_pointer_type end) {
auto p = new value_type[end - begin + 1];
*std::copy(begin, end, p) = SENTINEL;
return Donate(p);
}
static AllocatedString Duplicate(const_pointer_type begin,
size_type length) {
auto p = new value_type[length + 1];
*std::copy_n(begin, length, p) = SENTINEL;
return Donate(p);
}
AllocatedString &operator=(AllocatedString &&src) {
std::swap(value, src.value);
return *this;
}
constexpr bool operator==(std::nullptr_t) const {
return value == nullptr;
}
constexpr bool operator!=(std::nullptr_t) const {
return value != nullptr;
}
constexpr bool IsNull() const {
return value == nullptr;
}
constexpr const_pointer_type c_str() const {
return value;
}
bool empty() const {
return *value == SENTINEL;
}
constexpr pointer_type data() const {
return value;
}
reference_type operator[](size_type i) {
return value[i];
}
const reference_type operator[](size_type i) const {
return value[i];
}
pointer_type Steal() {
pointer_type result = value;
value = nullptr;
return result;
}
AllocatedString Clone() const {
return Duplicate(c_str());
}
};
#endif
|
