GCC Code Coverage Report

Directory: ./
File: libs/buffers/include/boost/buffers/copy.hpp
Date: 2025-12-08 19:22:53
Exec Total Coverage
Lines: 37 37 100.0%
Functions: 9 9 100.0%
Branches: 56 85 65.9%
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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/buffers
8 //
9
10 #ifndef BOOST_BUFFERS_COPY_HPP
11 #define BOOST_BUFFERS_COPY_HPP
12
13 #include <boost/buffers/detail/config.hpp>
14 #include <boost/buffers/buffer.hpp>
15 #include <cstring>
16 #include <utility>
17
18 namespace boost {
19 namespace buffers {
20
21 /** Copy the contents of a buffer sequence into another buffer sequence
22
23 This function copies no more than `at_most` bytes from the constant buffer
24 sequence denoted by `src` into the mutable buffer sequence denoted by `dest`.
25
26 @par Constraints
27 @code
28 requires is_mutable_buffer_sequence_v<decltype(dest)> &&
29 is_const_buffer_sequence_v<decltype(src)>;
30 @endcode
31
32 @return The number of bytes actually copied, which will be exactly equal to
33 `std::min( size(dest), size(src), at_most )`.
34
35 @param dest The destination buffer sequence
36
37 @param src The source buffer sequence
38 */
39 constexpr struct copy_mrdocs_workaround_t
40 {
41 template<
42 class MutableBufferSequence,
43 class ConstBufferSequence>
44 auto
45 600724 operator()(
46 MutableBufferSequence const& dest,
47 ConstBufferSequence const& src,
48 std::size_t at_most = std::size_t(-1)) const noexcept -> typename std::enable_if<
49 is_mutable_buffer_sequence<MutableBufferSequence>::value &&
50 is_const_buffer_sequence<ConstBufferSequence>::value, std::size_t>::type
51 {
52 600724 std::size_t total = 0;
53 600724 std::size_t pos0 = 0;
54 600724 std::size_t pos1 = 0;
55 600724 auto const end0 = end(src);
56 600724 auto const end1 = end(dest);
57 600724 auto it0 = begin(src);
58 600724 auto it1 = begin(dest);
59 600724 while(
60
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61
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 2941973 it0 != end0 &&
62 4 it1 != end1)
63 {
64 1026843 const_buffer b0 = *it0;
65 1026843 mutable_buffer b1 = *it1;
66 1026843 b0 += pos0;
67 1026843 b1 += pos1;
68 std::size_t const amount =
69 3080366 [&]
70 {
71 1026680 std::size_t n = b0.size();
72
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 1026680 if( n > b1.size())
73 23829 n = b1.size();
74
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 1026680 if( n > at_most - total)
75 4878 n = at_most - total;
76
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 1026680 if(n != 0)
77 772541 std::memcpy(
78 b1.data(),
79 b0.data(),
80 n);
81 1026680 return n;
82 1026843 }();
83 1026843 total += amount;
84
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 1026843 if(amount == b1.size())
85 {
86 32285 ++it1;
87 32285 pos1 = 0;
88 }
89 else
90 {
91 994558 pos1 += amount;
92 }
93
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 1026843 if(amount == b0.size())
94 {
95 999552 ++it0;
96 999552 pos0 = 0;
97 }
98 else
99 {
100 27291 pos0 += amount;
101 }
102 }
103 601136 return total;
104 412 }
105 } copy {};
106
107 } // buffers
108 } // boost
109
110 #endif
111