GCC Code Coverage Report

Directory: ./
File: libs/capy/include/boost/capy/buffers/string_buffer.hpp
Date: 2026-01-15 21:26:50
Exec Total Coverage
Lines: 51 51 100.0%
Functions: 10 10 100.0%
Branches: 16 16 100.0%
Line Branch Exec Source
1 //
2 // Copyright (c) 2023 Vinnie Falco (vinnie.falco@gmail.com)
3 //
4 // Distributed under the Boost Software License, Version 1.0. (See accompanying
5 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
6 //
7 // Official repository: https://github.com/cppalliance/capy
8 //
9
10 #ifndef BOOST_CAPY_BUFFERS_STRING_BUFFER_HPP
11 #define BOOST_CAPY_BUFFERS_STRING_BUFFER_HPP
12
13 #include <boost/capy/detail/config.hpp>
14 #include <boost/capy/buffers.hpp>
15 #include <boost/capy/buffers/detail/except.hpp>
16 #include <boost/assert.hpp>
17 #include <string>
18
19 namespace boost {
20 namespace capy {
21
22 /** A dynamic buffer using an underlying string
23 */
24 template<
25 class CharT,
26 class Traits = std::char_traits<CharT>,
27 class Allocator = std::allocator<CharT>>
28 class basic_string_buffer
29 {
30 std::basic_string<
31 CharT, Traits, Allocator>* s_;
32 std::size_t max_size_;
33
34 public:
35 using string_type = std::basic_string<
36 CharT, Traits, Allocator>;
37
38 unsigned char* data_ = nullptr;
39 std::size_t in_size_ = 0;
40 std::size_t out_size_ = 0;
41
42 public:
43 using const_buffers_type = const_buffer;
44 using mutable_buffers_type = mutable_buffer;
45
46 15 ~basic_string_buffer()
47 {
48
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 15 if(s_)
49 14 s_->resize(in_size_);
50 15 }
51
52 /** Constructor.
53 */
54 1 basic_string_buffer(
55 basic_string_buffer&& other) noexcept
56 1 : s_(other.s_)
57 1 , max_size_(other.max_size_)
58 {
59 1 other.s_ = nullptr;
60 1 }
61
62 /** Constructor.
63 */
64 explicit
65 14 basic_string_buffer(
66 string_type* s,
67 std::size_t max_size =
68 std::size_t(-1)) noexcept
69 14 : s_(s)
70 14 , max_size_(
71 14 max_size > s_->max_size()
72
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 14 ? s_->max_size()
73 14 : max_size)
74 {
75
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 14 if(s_->size() > max_size_)
76 1 s_->resize(max_size_);
77 14 in_size_ = s_->size();
78 14 }
79
80 /** Assignment.
81 */
82 basic_string_buffer& operator=(
83 basic_string_buffer const&) = delete;
84
85 std::size_t
86 2 size() const noexcept
87 {
88 2 return in_size_;
89 }
90
91 std::size_t
92 2 max_size() const noexcept
93 {
94 2 return max_size_;
95 }
96
97 std::size_t
98 2 capacity() const noexcept
99 {
100
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 2 if(s_->capacity() <= max_size_)
101 1 return s_->capacity() - in_size_;
102 1 return max_size_ - in_size_;
103 }
104
105 const_buffers_type
106 2 data() const noexcept
107 {
108 2 return const_buffers_type(
109 4 s_->data(), in_size_);
110 }
111
112 mutable_buffers_type
113 6 prepare(std::size_t n)
114 {
115 // n exceeds available space
116
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 6 if(n > max_size_ - in_size_)
117 1 detail::throw_invalid_argument();
118
119
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 5 if( s_->size() < in_size_ + n)
120 4 s_->resize(in_size_ + n);
121 5 out_size_ = n;
122 5 return mutable_buffers_type(
123 10 &(*s_)[in_size_], out_size_);
124 }
125
126 2 void commit(std::size_t n) noexcept
127 {
128
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 2 if(n < out_size_)
129 1 in_size_ += n;
130 else
131 1 in_size_ += out_size_;
132 2 out_size_ = 0;
133 2 }
134
135 2 void consume(std::size_t n) noexcept
136 {
137
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 2 if(n < in_size_)
138 {
139 1 s_->erase(0, n);
140 1 in_size_ -= n;
141 }
142 else
143 {
144 1 in_size_ = 0;
145 }
146 2 out_size_ = 0;
147 2 }
148 };
149
150 using string_buffer = basic_string_buffer<char>;
151
152 } // capy
153 } // boost
154
155 #endif
156