MPD: util/StringPointer.hxx Source File

MPD 0.20.18

StringPointer.hxx
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1 /*
2 * Copyright (C) 2015 Max Kellermann <max.kellermann@gmail.com>
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 *
8 * - Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 *
11 * - Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the
14 * distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
19 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
20 * FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
25 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
26 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
27 * OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30 #ifndef STRING_POINTER_HXX
31 #define STRING_POINTER_HXX
32
36 template<typename T=char>
37 class StringPointer {
38 public:
39 typedef T value_type;
40 typedef T &reference_type;
41 typedef const T &const_reference_type;
42 typedef T *pointer_type;
43 typedef const T *const_pointer_type;
44
45 static constexpr value_type SENTINEL = '\0';
46
47 private:
48 const_pointer_type value;
49
50 public:
51 StringPointer() = default;
52 constexpr StringPointer(const_pointer_type _value)
53 :value(_value) {}
54
59 constexpr bool IsNull() const {
60 return value == nullptr;
61 }
62
63 constexpr const_pointer_type c_str() const {
64 return value;
65 }
66
67 bool empty() const {
68 return *value == SENTINEL;
69 }
70 };
71
72 #endif
StringPointer::reference_type
T & reference_type
Definition: StringPointer.hxx:40
StringPointer
Simple OO wrapper for a const string pointer.
Definition: StringPointer.hxx:37
StringPointer::pointer_type
T * pointer_type
Definition: StringPointer.hxx:42
StringPointer::SENTINEL
static constexpr value_type SENTINEL
Definition: StringPointer.hxx:45
StringPointer::const_pointer_type
const T * const_pointer_type
Definition: StringPointer.hxx:43
StringPointer::c_str
constexpr const_pointer_type c_str() const
Definition: StringPointer.hxx:63
StringPointer::value_type
T value_type
Definition: StringPointer.hxx:39
StringPointer::empty
bool empty() const
Definition: StringPointer.hxx:67
StringPointer::const_reference_type
const T & const_reference_type
Definition: StringPointer.hxx:41
StringPointer::StringPointer
constexpr StringPointer(const_pointer_type _value)
Definition: StringPointer.hxx:52
StringPointer::StringPointer
StringPointer()=default
StringPointer::IsNull
constexpr bool IsNull() const
Check if this is a "nulled" instance.
Definition: StringPointer.hxx:59