include/boost/capy/buffers/buffer_array.hpp

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1			//
2			// Copyright (c) 2025 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_BUFFER_ARRAY_HPP
11			#define BOOST_CAPY_BUFFERS_BUFFER_ARRAY_HPP
12
13			#include <boost/capy/detail/config.hpp>
14			#include <boost/capy/detail/except.hpp>
15			#include <boost/capy/buffers.hpp>
16
17			#include <cstddef>
18			#include <new>
19			#include <span>
20			#include <utility>
21
22			namespace boost {
23			namespace capy {
24
25			namespace detail {
26
27			BOOST_CAPY_DECL
28			void
29			buffer_array_remove_prefix(
30			const_buffer* arr,
31			std::size_t* count,
32			std::size_t* total_size,
33			std::size_t n) noexcept;
34
35			BOOST_CAPY_DECL
36			void
37			buffer_array_remove_prefix(
38			mutable_buffer* arr,
39			std::size_t* count,
40			std::size_t* total_size,
41			std::size_t n) noexcept;
42
43			BOOST_CAPY_DECL
44			void
45			buffer_array_keep_prefix(
46			const_buffer* arr,
47			std::size_t* count,
48			std::size_t* total_size,
49			std::size_t n) noexcept;
50
51			BOOST_CAPY_DECL
52			void
53			buffer_array_keep_prefix(
54			mutable_buffer* arr,
55			std::size_t* count,
56			std::size_t* total_size,
57			std::size_t n) noexcept;
58
59			} // namespace detail
60
61			/** A buffer sequence holding up to N buffers.
62
63			This class template stores a fixed-capacity array of buffer
64			descriptors, where the actual count can vary from 0 to N.
65			It provides efficient storage for small buffer sequences
66			without dynamic allocation.
67
68			@par Example
69			@code
70			void process(ConstBufferSequence auto const& buffers)
71			{
72			const_buffer_array<4> bufs(buffers);
73			// use bufs.begin(), bufs.end(), bufs.to_span()
74			}
75			@endcode
76
77			@tparam N Maximum number of buffers the array can hold.
78			@tparam IsConst If true, holds const_buffer; otherwise mutable_buffer.
79			*/
80			template<std::size_t N, bool IsConst>
81			class buffer_array
82			{
83			public:
84			/** The type of buffer stored in the array.
85			*/
86			using value_type = std::conditional_t<IsConst, const_buffer, mutable_buffer>;
87
88			private:
89			std::size_t n_ = 0;
90			std::size_t size_ = 0;
91			union {
92			int dummy_;
93			value_type arr_[N];
94			};
95
96			public:
97			/** Construct a default instance.
98
99			Constructs an empty buffer array.
100			*/
101		6x	buffer_array() noexcept
102		6x	: dummy_(0)
103			{
104		6x	}
105
106			/** Construct a copy.
107			*/
108		4644x	buffer_array(buffer_array const& other) noexcept
109		4644x	: n_(other.n_)
110		4644x	, size_(other.size_)
111			{
112	8/8 boost::capy::buffer_array<16ul, false>::buffer_array(boost::capy::buffer_array<16ul, false> const&): ✓ Branch 0 taken 244 times. ✓ Branch 1 taken 141 times. boost::capy::buffer_array<16ul, true>::buffer_array(boost::capy::buffer_array<16ul, true> const&): ✓ Branch 0 taken 213 times. ✓ Branch 1 taken 117 times. boost::capy::buffer_array<4ul, false>::buffer_array(boost::capy::buffer_array<4ul, false> const&): ✓ Branch 0 taken 3511 times. ✓ Branch 1 taken 2193 times. boost::capy::buffer_array<4ul, true>::buffer_array(boost::capy::buffer_array<4ul, true> const&): ✓ Branch 0 taken 3511 times. ✓ Branch 1 taken 2193 times.	12123x	for(std::size_t i = 0; i < n_; ++i)
113		7479x	::new(&arr_[i]) value_type(other.arr_[i]);
114		4644x	}
115
116			/** Construct from a single buffer.
117
118			@param b The buffer to store.
119			*/
120		130x	buffer_array(value_type const& b) noexcept
121		130x	: dummy_(0)
122			{
123	7/8 boost::capy::buffer_array<16ul, false>::buffer_array(boost::capy::mutable_buffer const&): ✓ Branch 1 taken 64 times. ✓ Branch 2 taken 5 times. boost::capy::buffer_array<16ul, true>::buffer_array(boost::capy::const_buffer const&): ✓ Branch 1 taken 48 times. ✓ Branch 2 taken 2 times. boost::capy::buffer_array<4ul, false>::buffer_array(boost::capy::mutable_buffer const&): ✓ Branch 1 taken 5 times. ✗ Branch 2 not taken. boost::capy::buffer_array<4ul, true>::buffer_array(boost::capy::const_buffer const&): ✓ Branch 1 taken 5 times. ✓ Branch 2 taken 1 time.	130x	if(b.size() != 0)
124			{
125		122x	::new(&arr_[0]) value_type(b);
126		122x	n_ = 1;
127		122x	size_ = b.size();
128			}
129		130x	}
130
131			/** Construct from a buffer sequence.
132
133			Copies up to N buffer descriptors from the source
134			sequence into the internal array. If the sequence
135			contains more than N non-empty buffers, excess
136			buffers are silently ignored.
137
138			@param bs The buffer sequence to copy from.
139			*/
140			template<class BS>
141			requires (IsConst ? ConstBufferSequence<BS> : MutableBufferSequence<BS>)
142			&& (!std::same_as<std::remove_cvref_t<BS>, buffer_array>)
143			&& (!std::same_as<std::remove_cvref_t<BS>, value_type>)
144		185x	buffer_array(BS const& bs) noexcept
145		185x	: dummy_(0)
146			{
147		185x	auto it = capy::begin(bs);
148		185x	auto const last = capy::end(bs);
149	56/68 boost::capy::buffer_array<16ul, false>::buffer_array<std::array<boost::capy::mutable_buffer, 2ul> >(std::array<boost::capy::mutable_buffer, 2ul> const&): ✓ Branch 0 taken 24 times. ✓ Branch 1 taken 12 times. ✓ Branch 2 taken 24 times. ✗ Branch 3 not taken. boost::capy::buffer_array<16ul, false>::buffer_array<std::span<boost::capy::mutable_buffer const, 18446744073709551615ul> >(std::span<boost::capy::mutable_buffer const, 18446744073709551615ul> const&): ✓ Branch 1 taken 12 times. ✓ Branch 2 taken 6 times. ✓ Branch 3 taken 12 times. ✗ Branch 4 not taken. ✓ Branch 5 taken 12 times. ✓ Branch 6 taken 6 times. boost::capy::buffer_array<16ul, false>::buffer_array<std::span<boost::capy::mutable_buffer, 18446744073709551615ul> >(std::span<boost::capy::mutable_buffer, 18446744073709551615ul> const&): ✓ Branch 1 taken 52 times. ✓ Branch 2 taken 52 times. ✓ Branch 3 taken 52 times. ✗ Branch 4 not taken. ✓ Branch 5 taken 52 times. ✓ Branch 6 taken 52 times. boost::capy::buffer_array<16ul, false>::buffer_array<std::vector<boost::capy::mutable_buffer, std::allocator<boost::capy::mutable_buffer> > >(std::vector<boost::capy::mutable_buffer, std::allocator<boost::capy::mutable_buffer> > const&): ✓ Branch 1 taken 102 times. ✗ Branch 2 not taken. ✓ Branch 3 taken 96 times. ✓ Branch 4 taken 6 times. ✓ Branch 5 taken 96 times. ✓ Branch 6 taken 6 times. boost::capy::buffer_array<16ul, true>::buffer_array<std::array<boost::capy::const_buffer, 2ul> >(std::array<boost::capy::const_buffer, 2ul> const&): ✓ Branch 0 taken 12 times. ✓ Branch 1 taken 6 times. ✓ Branch 2 taken 12 times. ✗ Branch 3 not taken. boost::capy::buffer_array<16ul, true>::buffer_array<std::span<boost::capy::const_buffer const, 18446744073709551615ul> >(std::span<boost::capy::const_buffer const, 18446744073709551615ul> const&): ✓ Branch 1 taken 12 times. ✓ Branch 2 taken 8 times. ✓ Branch 3 taken 12 times. ✗ Branch 4 not taken. ✓ Branch 5 taken 12 times. ✓ Branch 6 taken 8 times. boost::capy::buffer_array<16ul, true>::buffer_array<std::span<boost::capy::const_buffer, 18446744073709551615ul> >(std::span<boost::capy::const_buffer, 18446744073709551615ul> const&): ✓ Branch 1 taken 51 times. ✓ Branch 2 taken 51 times. ✓ Branch 3 taken 51 times. ✗ Branch 4 not taken. ✓ Branch 5 taken 51 times. ✓ Branch 6 taken 51 times. boost::capy::buffer_array<16ul, true>::buffer_array<std::vector<boost::capy::const_buffer, std::allocator<boost::capy::const_buffer> > >(std::vector<boost::capy::const_buffer, std::allocator<boost::capy::const_buffer> > const&): ✓ Branch 1 taken 102 times. ✗ Branch 2 not taken. ✓ Branch 3 taken 96 times. ✓ Branch 4 taken 6 times. ✓ Branch 5 taken 96 times. ✓ Branch 6 taken 6 times. boost::capy::buffer_array<2ul, false>::buffer_array<std::vector<boost::capy::mutable_buffer, std::allocator<boost::capy::mutable_buffer> > >(std::vector<boost::capy::mutable_buffer, std::allocator<boost::capy::mutable_buffer> > const&): ✓ Branch 1 taken 6 times. ✗ Branch 2 not taken. ✓ Branch 3 taken 4 times. ✓ Branch 4 taken 2 times. ✓ Branch 5 taken 4 times. ✓ Branch 6 taken 2 times. boost::capy::buffer_array<2ul, true>::buffer_array<std::vector<boost::capy::const_buffer, std::allocator<boost::capy::const_buffer> > >(std::vector<boost::capy::const_buffer, std::allocator<boost::capy::const_buffer> > const&): ✓ Branch 1 taken 6 times. ✗ Branch 2 not taken. ✓ Branch 3 taken 4 times. ✓ Branch 4 taken 2 times. ✓ Branch 5 taken 4 times. ✓ Branch 6 taken 2 times. boost::capy::buffer_array<4ul, false>::buffer_array<std::vector<boost::capy::mutable_buffer, std::allocator<boost::capy::mutable_buffer> > >(std::vector<boost::capy::mutable_buffer, std::allocator<boost::capy::mutable_buffer> > const&): ✓ Branch 1 taken 35 times. ✓ Branch 2 taken 17 times. ✓ Branch 3 taken 35 times. ✗ Branch 4 not taken. ✓ Branch 5 taken 35 times. ✓ Branch 6 taken 17 times. boost::capy::buffer_array<4ul, true>::buffer_array<std::vector<boost::capy::const_buffer, std::allocator<boost::capy::const_buffer> > >(std::vector<boost::capy::const_buffer, std::allocator<boost::capy::const_buffer> > const&): ✓ Branch 1 taken 35 times. ✓ Branch 2 taken 17 times. ✓ Branch 3 taken 35 times. ✗ Branch 4 not taken. ✓ Branch 5 taken 35 times. ✓ Branch 6 taken 17 times.	618x	while(it != last && n_ < N)
150			{
151		433x	value_type b(*it);
152	15/24 boost::capy::buffer_array<16ul, false>::buffer_array<std::array<boost::capy::mutable_buffer, 2ul> >(std::array<boost::capy::mutable_buffer, 2ul> const&): ✓ Branch 1 taken 24 times. ✗ Branch 2 not taken. boost::capy::buffer_array<16ul, false>::buffer_array<std::span<boost::capy::mutable_buffer const, 18446744073709551615ul> >(std::span<boost::capy::mutable_buffer const, 18446744073709551615ul> const&): ✓ Branch 1 taken 12 times. ✗ Branch 2 not taken. boost::capy::buffer_array<16ul, false>::buffer_array<std::span<boost::capy::mutable_buffer, 18446744073709551615ul> >(std::span<boost::capy::mutable_buffer, 18446744073709551615ul> const&): ✓ Branch 1 taken 52 times. ✗ Branch 2 not taken. boost::capy::buffer_array<16ul, false>::buffer_array<std::vector<boost::capy::mutable_buffer, std::allocator<boost::capy::mutable_buffer> > >(std::vector<boost::capy::mutable_buffer, std::allocator<boost::capy::mutable_buffer> > const&): ✓ Branch 1 taken 96 times. ✗ Branch 2 not taken. boost::capy::buffer_array<16ul, true>::buffer_array<std::array<boost::capy::const_buffer, 2ul> >(std::array<boost::capy::const_buffer, 2ul> const&): ✓ Branch 1 taken 12 times. ✗ Branch 2 not taken. boost::capy::buffer_array<16ul, true>::buffer_array<std::span<boost::capy::const_buffer const, 18446744073709551615ul> >(std::span<boost::capy::const_buffer const, 18446744073709551615ul> const&): ✓ Branch 1 taken 12 times. ✗ Branch 2 not taken. boost::capy::buffer_array<16ul, true>::buffer_array<std::span<boost::capy::const_buffer, 18446744073709551615ul> >(std::span<boost::capy::const_buffer, 18446744073709551615ul> const&): ✓ Branch 1 taken 49 times. ✓ Branch 2 taken 2 times. boost::capy::buffer_array<16ul, true>::buffer_array<std::vector<boost::capy::const_buffer, std::allocator<boost::capy::const_buffer> > >(std::vector<boost::capy::const_buffer, std::allocator<boost::capy::const_buffer> > const&): ✓ Branch 1 taken 96 times. ✗ Branch 2 not taken. boost::capy::buffer_array<2ul, false>::buffer_array<std::vector<boost::capy::mutable_buffer, std::allocator<boost::capy::mutable_buffer> > >(std::vector<boost::capy::mutable_buffer, std::allocator<boost::capy::mutable_buffer> > const&): ✓ Branch 1 taken 4 times. ✗ Branch 2 not taken. boost::capy::buffer_array<2ul, true>::buffer_array<std::vector<boost::capy::const_buffer, std::allocator<boost::capy::const_buffer> > >(std::vector<boost::capy::const_buffer, std::allocator<boost::capy::const_buffer> > const&): ✓ Branch 1 taken 4 times. ✗ Branch 2 not taken. boost::capy::buffer_array<4ul, false>::buffer_array<std::vector<boost::capy::mutable_buffer, std::allocator<boost::capy::mutable_buffer> > >(std::vector<boost::capy::mutable_buffer, std::allocator<boost::capy::mutable_buffer> > const&): ✓ Branch 1 taken 33 times. ✓ Branch 2 taken 2 times. boost::capy::buffer_array<4ul, true>::buffer_array<std::vector<boost::capy::const_buffer, std::allocator<boost::capy::const_buffer> > >(std::vector<boost::capy::const_buffer, std::allocator<boost::capy::const_buffer> > const&): ✓ Branch 1 taken 33 times. ✓ Branch 2 taken 2 times.	433x	if(b.size() != 0)
153			{
154		427x	::new(&arr_[n_++]) value_type(b);
155		427x	size_ += b.size();
156			}
157		433x	++it;
158			}
159		185x	}
160
161			/** Construct from a buffer sequence with overflow checking.
162
163			Copies buffer descriptors from the source sequence
164			into the internal array.
165
166			@param bs The buffer sequence to copy from.
167
168			@throws std::length_error if the sequence contains
169			more than N non-empty buffers.
170			*/
171			template<class BS>
172			requires (IsConst ? ConstBufferSequence<BS> : MutableBufferSequence<BS>)
173		4x	buffer_array(std::in_place_t, BS const& bs)
174		4x	: dummy_(0)
175			{
176		4x	auto it = capy::begin(bs);
177		4x	auto const last = capy::end(bs);
178	6/8 boost::capy::buffer_array<2ul, false>::buffer_array<std::vector<boost::capy::mutable_buffer, std::allocator<boost::capy::mutable_buffer> > >(std::in_place_t, std::vector<boost::capy::mutable_buffer, std::allocator<boost::capy::mutable_buffer> > const&): ✓ Branch 1 taken 3 times. ✗ Branch 2 not taken. boost::capy::buffer_array<2ul, true>::buffer_array<std::vector<boost::capy::const_buffer, std::allocator<boost::capy::const_buffer> > >(std::in_place_t, std::vector<boost::capy::const_buffer, std::allocator<boost::capy::const_buffer> > const&): ✓ Branch 1 taken 3 times. ✗ Branch 2 not taken. boost::capy::buffer_array<4ul, false>::buffer_array<std::vector<boost::capy::mutable_buffer, std::allocator<boost::capy::mutable_buffer> > >(std::in_place_t, std::vector<boost::capy::mutable_buffer, std::allocator<boost::capy::mutable_buffer> > const&): ✓ Branch 1 taken 3 times. ✓ Branch 2 taken 1 time. boost::capy::buffer_array<4ul, true>::buffer_array<std::vector<boost::capy::const_buffer, std::allocator<boost::capy::const_buffer> > >(std::in_place_t, std::vector<boost::capy::const_buffer, std::allocator<boost::capy::const_buffer> > const&): ✓ Branch 1 taken 3 times. ✓ Branch 2 taken 1 time.	14x	while(it != last)
179			{
180		12x	value_type b(*it);
181	4/8 boost::capy::buffer_array<2ul, false>::buffer_array<std::vector<boost::capy::mutable_buffer, std::allocator<boost::capy::mutable_buffer> > >(std::in_place_t, std::vector<boost::capy::mutable_buffer, std::allocator<boost::capy::mutable_buffer> > const&): ✓ Branch 1 taken 3 times. ✗ Branch 2 not taken. boost::capy::buffer_array<2ul, true>::buffer_array<std::vector<boost::capy::const_buffer, std::allocator<boost::capy::const_buffer> > >(std::in_place_t, std::vector<boost::capy::const_buffer, std::allocator<boost::capy::const_buffer> > const&): ✓ Branch 1 taken 3 times. ✗ Branch 2 not taken. boost::capy::buffer_array<4ul, false>::buffer_array<std::vector<boost::capy::mutable_buffer, std::allocator<boost::capy::mutable_buffer> > >(std::in_place_t, std::vector<boost::capy::mutable_buffer, std::allocator<boost::capy::mutable_buffer> > const&): ✓ Branch 1 taken 3 times. ✗ Branch 2 not taken. boost::capy::buffer_array<4ul, true>::buffer_array<std::vector<boost::capy::const_buffer, std::allocator<boost::capy::const_buffer> > >(std::in_place_t, std::vector<boost::capy::const_buffer, std::allocator<boost::capy::const_buffer> > const&): ✓ Branch 1 taken 3 times. ✗ Branch 2 not taken.	12x	if(b.size() != 0)
182			{
183	6/8 boost::capy::buffer_array<2ul, false>::buffer_array<std::vector<boost::capy::mutable_buffer, std::allocator<boost::capy::mutable_buffer> > >(std::in_place_t, std::vector<boost::capy::mutable_buffer, std::allocator<boost::capy::mutable_buffer> > const&): ✓ Branch 0 taken 1 time. ✓ Branch 1 taken 2 times. boost::capy::buffer_array<2ul, true>::buffer_array<std::vector<boost::capy::const_buffer, std::allocator<boost::capy::const_buffer> > >(std::in_place_t, std::vector<boost::capy::const_buffer, std::allocator<boost::capy::const_buffer> > const&): ✓ Branch 0 taken 1 time. ✓ Branch 1 taken 2 times. boost::capy::buffer_array<4ul, false>::buffer_array<std::vector<boost::capy::mutable_buffer, std::allocator<boost::capy::mutable_buffer> > >(std::in_place_t, std::vector<boost::capy::mutable_buffer, std::allocator<boost::capy::mutable_buffer> > const&): ✗ Branch 0 not taken. ✓ Branch 1 taken 3 times. boost::capy::buffer_array<4ul, true>::buffer_array<std::vector<boost::capy::const_buffer, std::allocator<boost::capy::const_buffer> > >(std::in_place_t, std::vector<boost::capy::const_buffer, std::allocator<boost::capy::const_buffer> > const&): ✗ Branch 0 not taken. ✓ Branch 1 taken 3 times.	12x	if(n_ >= N)
184		2x	detail::throw_length_error();
185		10x	::new(&arr_[n_++]) value_type(b);
186		10x	size_ += b.size();
187			}
188		10x	++it;
189			}
190		2x	}
191
192			/** Construct from an iterator range.
193
194			Copies up to N non-empty buffer descriptors from the
195			range `[first, last)`. If the range contains more than
196			N non-empty buffers, excess buffers are silently ignored.
197
198			@param first Iterator to the first buffer descriptor.
199			@param last Iterator past the last buffer descriptor.
200			*/
201			template<class Iterator>
202		8x	buffer_array(Iterator first, Iterator last) noexcept
203		8x	: dummy_(0)
204			{
205	20/24 boost::capy::buffer_array<2ul, false>::buffer_array<__gnu_cxx::__normal_iterator<boost::capy::mutable_buffer, std::vector<boost::capy::mutable_buffer, std::allocator<boost::capy::mutable_buffer> > > >(__gnu_cxx::__normal_iterator<boost::capy::mutable_buffer, std::vector<boost::capy::mutable_buffer, std::allocator<boost::capy::mutable_buffer> > >, __gnu_cxx::__normal_iterator<boost::capy::mutable_buffer, std::vector<boost::capy::mutable_buffer, std::allocator<boost::capy::mutable_buffer> > >): ✓ Branch 1 taken 3 times. ✗ Branch 2 not taken. ✓ Branch 3 taken 2 times. ✓ Branch 4 taken 1 time. ✓ Branch 5 taken 2 times. ✓ Branch 6 taken 1 time. boost::capy::buffer_array<2ul, true>::buffer_array<__gnu_cxx::__normal_iterator<boost::capy::const_buffer, std::vector<boost::capy::const_buffer, std::allocator<boost::capy::const_buffer> > > >(__gnu_cxx::__normal_iterator<boost::capy::const_buffer, std::vector<boost::capy::const_buffer, std::allocator<boost::capy::const_buffer> > >, __gnu_cxx::__normal_iterator<boost::capy::const_buffer, std::vector<boost::capy::const_buffer, std::allocator<boost::capy::const_buffer> > >): ✓ Branch 1 taken 3 times. ✗ Branch 2 not taken. ✓ Branch 3 taken 2 times. ✓ Branch 4 taken 1 time. ✓ Branch 5 taken 2 times. ✓ Branch 6 taken 1 time. boost::capy::buffer_array<4ul, false>::buffer_array<__gnu_cxx::__normal_iterator<boost::capy::mutable_buffer, std::vector<boost::capy::mutable_buffer, std::allocator<boost::capy::mutable_buffer> > > >(__gnu_cxx::__normal_iterator<boost::capy::mutable_buffer, std::vector<boost::capy::mutable_buffer, std::allocator<boost::capy::mutable_buffer> > >, __gnu_cxx::__normal_iterator<boost::capy::mutable_buffer, std::vector<boost::capy::mutable_buffer, std::allocator<boost::capy::mutable_buffer> > >): ✓ Branch 1 taken 7 times. ✓ Branch 2 taken 3 times. ✓ Branch 3 taken 7 times. ✗ Branch 4 not taken. ✓ Branch 5 taken 7 times. ✓ Branch 6 taken 3 times. boost::capy::buffer_array<4ul, true>::buffer_array<__gnu_cxx::__normal_iterator<boost::capy::const_buffer, std::vector<boost::capy::const_buffer, std::allocator<boost::capy::const_buffer> > > >(__gnu_cxx::__normal_iterator<boost::capy::const_buffer, std::vector<boost::capy::const_buffer, std::allocator<boost::capy::const_buffer> > >, __gnu_cxx::__normal_iterator<boost::capy::const_buffer, std::vector<boost::capy::const_buffer, std::allocator<boost::capy::const_buffer> > >): ✓ Branch 1 taken 7 times. ✓ Branch 2 taken 3 times. ✓ Branch 3 taken 7 times. ✗ Branch 4 not taken. ✓ Branch 5 taken 7 times. ✓ Branch 6 taken 3 times.	26x	while(first != last && n_ < N)
206			{
207		18x	value_type b(*first);
208	6/8 boost::capy::buffer_array<2ul, false>::buffer_array<__gnu_cxx::__normal_iterator<boost::capy::mutable_buffer, std::vector<boost::capy::mutable_buffer, std::allocator<boost::capy::mutable_buffer> > > >(__gnu_cxx::__normal_iterator<boost::capy::mutable_buffer, std::vector<boost::capy::mutable_buffer, std::allocator<boost::capy::mutable_buffer> > >, __gnu_cxx::__normal_iterator<boost::capy::mutable_buffer, std::vector<boost::capy::mutable_buffer, std::allocator<boost::capy::mutable_buffer> > >): ✓ Branch 1 taken 2 times. ✗ Branch 2 not taken. boost::capy::buffer_array<2ul, true>::buffer_array<__gnu_cxx::__normal_iterator<boost::capy::const_buffer, std::vector<boost::capy::const_buffer, std::allocator<boost::capy::const_buffer> > > >(__gnu_cxx::__normal_iterator<boost::capy::const_buffer, std::vector<boost::capy::const_buffer, std::allocator<boost::capy::const_buffer> > >, __gnu_cxx::__normal_iterator<boost::capy::const_buffer, std::vector<boost::capy::const_buffer, std::allocator<boost::capy::const_buffer> > >): ✓ Branch 1 taken 2 times. ✗ Branch 2 not taken. boost::capy::buffer_array<4ul, false>::buffer_array<__gnu_cxx::__normal_iterator<boost::capy::mutable_buffer, std::vector<boost::capy::mutable_buffer, std::allocator<boost::capy::mutable_buffer> > > >(__gnu_cxx::__normal_iterator<boost::capy::mutable_buffer, std::vector<boost::capy::mutable_buffer, std::allocator<boost::capy::mutable_buffer> > >, __gnu_cxx::__normal_iterator<boost::capy::mutable_buffer, std::vector<boost::capy::mutable_buffer, std::allocator<boost::capy::mutable_buffer> > >): ✓ Branch 1 taken 5 times. ✓ Branch 2 taken 2 times. boost::capy::buffer_array<4ul, true>::buffer_array<__gnu_cxx::__normal_iterator<boost::capy::const_buffer, std::vector<boost::capy::const_buffer, std::allocator<boost::capy::const_buffer> > > >(__gnu_cxx::__normal_iterator<boost::capy::const_buffer, std::vector<boost::capy::const_buffer, std::allocator<boost::capy::const_buffer> > >, __gnu_cxx::__normal_iterator<boost::capy::const_buffer, std::vector<boost::capy::const_buffer, std::allocator<boost::capy::const_buffer> > >): ✓ Branch 1 taken 5 times. ✓ Branch 2 taken 2 times.	18x	if(b.size() != 0)
209			{
210		14x	::new(&arr_[n_++]) value_type(b);
211		14x	size_ += b.size();
212			}
213		18x	++first;
214			}
215		8x	}
216
217			/** Construct from an iterator range with overflow checking.
218
219			Copies all non-empty buffer descriptors from the range
220			`[first, last)` into the internal array.
221
222			@param first Iterator to the first buffer descriptor.
223			@param last Iterator past the last buffer descriptor.
224
225			@throws std::length_error if the range contains more
226			than N non-empty buffers.
227			*/
228			template<class Iterator>
229		4x	buffer_array(std::in_place_t, Iterator first, Iterator last)
230		4x	: dummy_(0)
231			{
232	6/8 boost::capy::buffer_array<2ul, false>::buffer_array<__gnu_cxx::__normal_iterator<boost::capy::mutable_buffer, std::vector<boost::capy::mutable_buffer, std::allocator<boost::capy::mutable_buffer> > > >(std::in_place_t, __gnu_cxx::__normal_iterator<boost::capy::mutable_buffer, std::vector<boost::capy::mutable_buffer, std::allocator<boost::capy::mutable_buffer> > >, __gnu_cxx::__normal_iterator<boost::capy::mutable_buffer, std::vector<boost::capy::mutable_buffer, std::allocator<boost::capy::mutable_buffer> > >): ✓ Branch 1 taken 3 times. ✗ Branch 2 not taken. boost::capy::buffer_array<2ul, true>::buffer_array<__gnu_cxx::__normal_iterator<boost::capy::const_buffer, std::vector<boost::capy::const_buffer, std::allocator<boost::capy::const_buffer> > > >(std::in_place_t, __gnu_cxx::__normal_iterator<boost::capy::const_buffer, std::vector<boost::capy::const_buffer, std::allocator<boost::capy::const_buffer> > >, __gnu_cxx::__normal_iterator<boost::capy::const_buffer, std::vector<boost::capy::const_buffer, std::allocator<boost::capy::const_buffer> > >): ✓ Branch 1 taken 3 times. ✗ Branch 2 not taken. boost::capy::buffer_array<4ul, false>::buffer_array<__gnu_cxx::__normal_iterator<boost::capy::mutable_buffer, std::vector<boost::capy::mutable_buffer, std::allocator<boost::capy::mutable_buffer> > > >(std::in_place_t, __gnu_cxx::__normal_iterator<boost::capy::mutable_buffer, std::vector<boost::capy::mutable_buffer, std::allocator<boost::capy::mutable_buffer> > >, __gnu_cxx::__normal_iterator<boost::capy::mutable_buffer, std::vector<boost::capy::mutable_buffer, std::allocator<boost::capy::mutable_buffer> > >): ✓ Branch 1 taken 3 times. ✓ Branch 2 taken 1 time. boost::capy::buffer_array<4ul, true>::buffer_array<__gnu_cxx::__normal_iterator<boost::capy::const_buffer, std::vector<boost::capy::const_buffer, std::allocator<boost::capy::const_buffer> > > >(std::in_place_t, __gnu_cxx::__normal_iterator<boost::capy::const_buffer, std::vector<boost::capy::const_buffer, std::allocator<boost::capy::const_buffer> > >, __gnu_cxx::__normal_iterator<boost::capy::const_buffer, std::vector<boost::capy::const_buffer, std::allocator<boost::capy::const_buffer> > >): ✓ Branch 1 taken 3 times. ✓ Branch 2 taken 1 time.	14x	while(first != last)
233			{
234		12x	value_type b(*first);
235	4/8 boost::capy::buffer_array<2ul, false>::buffer_array<__gnu_cxx::__normal_iterator<boost::capy::mutable_buffer, std::vector<boost::capy::mutable_buffer, std::allocator<boost::capy::mutable_buffer> > > >(std::in_place_t, __gnu_cxx::__normal_iterator<boost::capy::mutable_buffer, std::vector<boost::capy::mutable_buffer, std::allocator<boost::capy::mutable_buffer> > >, __gnu_cxx::__normal_iterator<boost::capy::mutable_buffer, std::vector<boost::capy::mutable_buffer, std::allocator<boost::capy::mutable_buffer> > >): ✓ Branch 1 taken 3 times. ✗ Branch 2 not taken. boost::capy::buffer_array<2ul, true>::buffer_array<__gnu_cxx::__normal_iterator<boost::capy::const_buffer, std::vector<boost::capy::const_buffer, std::allocator<boost::capy::const_buffer> > > >(std::in_place_t, __gnu_cxx::__normal_iterator<boost::capy::const_buffer, std::vector<boost::capy::const_buffer, std::allocator<boost::capy::const_buffer> > >, __gnu_cxx::__normal_iterator<boost::capy::const_buffer, std::vector<boost::capy::const_buffer, std::allocator<boost::capy::const_buffer> > >): ✓ Branch 1 taken 3 times. ✗ Branch 2 not taken. boost::capy::buffer_array<4ul, false>::buffer_array<__gnu_cxx::__normal_iterator<boost::capy::mutable_buffer, std::vector<boost::capy::mutable_buffer, std::allocator<boost::capy::mutable_buffer> > > >(std::in_place_t, __gnu_cxx::__normal_iterator<boost::capy::mutable_buffer, std::vector<boost::capy::mutable_buffer, std::allocator<boost::capy::mutable_buffer> > >, __gnu_cxx::__normal_iterator<boost::capy::mutable_buffer, std::vector<boost::capy::mutable_buffer, std::allocator<boost::capy::mutable_buffer> > >): ✓ Branch 1 taken 3 times. ✗ Branch 2 not taken. boost::capy::buffer_array<4ul, true>::buffer_array<__gnu_cxx::__normal_iterator<boost::capy::const_buffer, std::vector<boost::capy::const_buffer, std::allocator<boost::capy::const_buffer> > > >(std::in_place_t, __gnu_cxx::__normal_iterator<boost::capy::const_buffer, std::vector<boost::capy::const_buffer, std::allocator<boost::capy::const_buffer> > >, __gnu_cxx::__normal_iterator<boost::capy::const_buffer, std::vector<boost::capy::const_buffer, std::allocator<boost::capy::const_buffer> > >): ✓ Branch 1 taken 3 times. ✗ Branch 2 not taken.	12x	if(b.size() != 0)
236			{
237	6/8 boost::capy::buffer_array<2ul, false>::buffer_array<__gnu_cxx::__normal_iterator<boost::capy::mutable_buffer, std::vector<boost::capy::mutable_buffer, std::allocator<boost::capy::mutable_buffer> > > >(std::in_place_t, __gnu_cxx::__normal_iterator<boost::capy::mutable_buffer, std::vector<boost::capy::mutable_buffer, std::allocator<boost::capy::mutable_buffer> > >, __gnu_cxx::__normal_iterator<boost::capy::mutable_buffer, std::vector<boost::capy::mutable_buffer, std::allocator<boost::capy::mutable_buffer> > >): ✓ Branch 0 taken 1 time. ✓ Branch 1 taken 2 times. boost::capy::buffer_array<2ul, true>::buffer_array<__gnu_cxx::__normal_iterator<boost::capy::const_buffer, std::vector<boost::capy::const_buffer, std::allocator<boost::capy::const_buffer> > > >(std::in_place_t, __gnu_cxx::__normal_iterator<boost::capy::const_buffer, std::vector<boost::capy::const_buffer, std::allocator<boost::capy::const_buffer> > >, __gnu_cxx::__normal_iterator<boost::capy::const_buffer, std::vector<boost::capy::const_buffer, std::allocator<boost::capy::const_buffer> > >): ✓ Branch 0 taken 1 time. ✓ Branch 1 taken 2 times. boost::capy::buffer_array<4ul, false>::buffer_array<__gnu_cxx::__normal_iterator<boost::capy::mutable_buffer, std::vector<boost::capy::mutable_buffer, std::allocator<boost::capy::mutable_buffer> > > >(std::in_place_t, __gnu_cxx::__normal_iterator<boost::capy::mutable_buffer, std::vector<boost::capy::mutable_buffer, std::allocator<boost::capy::mutable_buffer> > >, __gnu_cxx::__normal_iterator<boost::capy::mutable_buffer, std::vector<boost::capy::mutable_buffer, std::allocator<boost::capy::mutable_buffer> > >): ✗ Branch 0 not taken. ✓ Branch 1 taken 3 times. boost::capy::buffer_array<4ul, true>::buffer_array<__gnu_cxx::__normal_iterator<boost::capy::const_buffer, std::vector<boost::capy::const_buffer, std::allocator<boost::capy::const_buffer> > > >(std::in_place_t, __gnu_cxx::__normal_iterator<boost::capy::const_buffer, std::vector<boost::capy::const_buffer, std::allocator<boost::capy::const_buffer> > >, __gnu_cxx::__normal_iterator<boost::capy::const_buffer, std::vector<boost::capy::const_buffer, std::allocator<boost::capy::const_buffer> > >): ✗ Branch 0 not taken. ✓ Branch 1 taken 3 times.	12x	if(n_ >= N)
238		2x	detail::throw_length_error();
239		10x	::new(&arr_[n_++]) value_type(b);
240		10x	size_ += b.size();
241			}
242		10x	++first;
243			}
244		2x	}
245
246			/** Destructor.
247			*/
248		4977x	~buffer_array()
249			{
250	12/12 boost::capy::buffer_array<16ul, false>::~buffer_array(): ✓ Branch 0 taken 492 times. ✓ Branch 1 taken 286 times. boost::capy::buffer_array<16ul, true>::~buffer_array(): ✓ Branch 0 taken 430 times. ✓ Branch 1 taken 238 times. boost::capy::buffer_array<2ul, false>::~buffer_array(): ✓ Branch 0 taken 8 times. ✓ Branch 1 taken 4 times. boost::capy::buffer_array<2ul, true>::~buffer_array(): ✓ Branch 0 taken 8 times. ✓ Branch 1 taken 4 times. boost::capy::buffer_array<4ul, false>::~buffer_array(): ✓ Branch 0 taken 2961 times. ✓ Branch 1 taken 2222 times. boost::capy::buffer_array<4ul, true>::~buffer_array(): ✓ Branch 0 taken 2961 times. ✓ Branch 1 taken 2223 times.	11837x	while(n_--)
251		6860x	arr_[n_].~value_type();
252		4977x	}
253
254			/** Assign by copying.
255			*/
256			buffer_array&
257		4x	operator=(buffer_array const& other) noexcept
258			{
259	4/8 boost::capy::buffer_array<2ul, false>::operator=(boost::capy::buffer_array<2ul, false> const&): ✓ Branch 0 taken 1 time. ✗ Branch 1 not taken. boost::capy::buffer_array<2ul, true>::operator=(boost::capy::buffer_array<2ul, true> const&): ✓ Branch 0 taken 1 time. ✗ Branch 1 not taken. boost::capy::buffer_array<4ul, false>::operator=(boost::capy::buffer_array<4ul, false> const&): ✓ Branch 0 taken 1 time. ✗ Branch 1 not taken. boost::capy::buffer_array<4ul, true>::operator=(boost::capy::buffer_array<4ul, true> const&): ✓ Branch 0 taken 1 time. ✗ Branch 1 not taken.	4x	if(this != &other)
260			{
261	4/8 boost::capy::buffer_array<2ul, false>::operator=(boost::capy::buffer_array<2ul, false> const&): ✗ Branch 0 not taken. ✓ Branch 1 taken 1 time. boost::capy::buffer_array<2ul, true>::operator=(boost::capy::buffer_array<2ul, true> const&): ✗ Branch 0 not taken. ✓ Branch 1 taken 1 time. boost::capy::buffer_array<4ul, false>::operator=(boost::capy::buffer_array<4ul, false> const&): ✗ Branch 0 not taken. ✓ Branch 1 taken 1 time. boost::capy::buffer_array<4ul, true>::operator=(boost::capy::buffer_array<4ul, true> const&): ✗ Branch 0 not taken. ✓ Branch 1 taken 1 time.	4x	while(n_--)
262		✗	arr_[n_].~value_type();
263		4x	n_ = other.n_;
264		4x	size_ = other.size_;
265	8/8 boost::capy::buffer_array<2ul, false>::operator=(boost::capy::buffer_array<2ul, false> const&): ✓ Branch 0 taken 2 times. ✓ Branch 1 taken 1 time. boost::capy::buffer_array<2ul, true>::operator=(boost::capy::buffer_array<2ul, true> const&): ✓ Branch 0 taken 2 times. ✓ Branch 1 taken 1 time. boost::capy::buffer_array<4ul, false>::operator=(boost::capy::buffer_array<4ul, false> const&): ✓ Branch 0 taken 1 time. ✓ Branch 1 taken 1 time. boost::capy::buffer_array<4ul, true>::operator=(boost::capy::buffer_array<4ul, true> const&): ✓ Branch 0 taken 1 time. ✓ Branch 1 taken 1 time.	10x	for(std::size_t i = 0; i < n_; ++i)
266		6x	::new(&arr_[i]) value_type(other.arr_[i]);
267			}
268		4x	return *this;
269			}
270
271			/** Return an iterator to the beginning.
272			*/
273			value_type*
274		8834x	begin() noexcept
275			{
276		8834x	return arr_;
277			}
278
279			/** Return an iterator to the beginning.
280			*/
281			value_type const*
282		11022x	begin() const noexcept
283			{
284		11022x	return arr_;
285			}
286
287			/** Return an iterator to the end.
288			*/
289			value_type*
290		8833x	end() noexcept
291			{
292		8833x	return arr_ + n_;
293			}
294
295			/** Return an iterator to the end.
296			*/
297			value_type const*
298		11022x	end() const noexcept
299			{
300		11022x	return arr_ + n_;
301			}
302
303			/** Return a span of the buffers.
304			*/
305			std::span<value_type>
306		379x	to_span() noexcept
307			{
308		379x	return { arr_, n_ };
309			}
310
311			/** Return a span of the buffers.
312			*/
313			std::span<value_type const>
314		175x	to_span() const noexcept
315			{
316		175x	return { arr_, n_ };
317			}
318
319			/** Conversion to mutable span.
320			*/
321		1x	operator std::span<value_type>() noexcept
322			{
323		1x	return { arr_, n_ };
324			}
325
326			/** Conversion to const span.
327			*/
328			operator std::span<value_type const>() const noexcept
329			{
330			return { arr_, n_ };
331			}
332
333			/** Return the total byte count in O(1).
334			*/
335			friend
336			std::size_t
337		5499x	tag_invoke(
338			size_tag const&,
339			buffer_array const& ba) noexcept
340			{
341		5499x	return ba.size_;
342			}
343
344			/** Slice customization point.
345			*/
346			friend
347			void
348		2080x	tag_invoke(
349			slice_tag const&,
350			buffer_array& ba,
351			slice_how how,
352			std::size_t n) noexcept
353			{
354		2080x	ba.slice_impl(how, n);
355		2080x	}
356
357			private:
358			void
359		2080x	slice_impl(
360			slice_how how,
361			std::size_t n) noexcept
362			{
363	4/6 boost::capy::buffer_array<4ul, false>::slice_impl(boost::capy::slice_how, unsigned long): ✓ Branch 0 taken 512 times. ✓ Branch 1 taken 528 times. ✗ Branch 2 not taken. boost::capy::buffer_array<4ul, true>::slice_impl(boost::capy::slice_how, unsigned long): ✓ Branch 0 taken 512 times. ✓ Branch 1 taken 528 times. ✗ Branch 2 not taken.	2080x	switch(how)
364			{
365		1024x	case slice_how::remove_prefix:
366		1024x	remove_prefix_impl(n);
367		1024x	break;
368
369		1056x	case slice_how::keep_prefix:
370		1056x	keep_prefix_impl(n);
371		1056x	break;
372			}
373		2080x	}
374
375			void
376		1024x	remove_prefix_impl(std::size_t n) noexcept
377			{
378		1024x	detail::buffer_array_remove_prefix(arr_, &n_, &size_, n);
379		1024x	}
380
381			void
382		1056x	keep_prefix_impl(std::size_t n) noexcept
383			{
384		1056x	detail::buffer_array_keep_prefix(arr_, &n_, &size_, n);
385		1056x	}
386			};
387
388			/** Alias for buffer_array holding const_buffer.
389
390			@tparam N Maximum number of buffers.
391			*/
392			template<std::size_t N>
393			using const_buffer_array = buffer_array<N, true>;
394
395			/** Alias for buffer_array holding mutable_buffer.
396
397			@tparam N Maximum number of buffers.
398			*/
399			template<std::size_t N>
400			using mutable_buffer_array = buffer_array<N, false>;
401
402			} // namespace capy
403			} // namespace boost
404
405			#endif
406