15380630124

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Merge b85ad7435 into a32e9aeba

Pull Request Pull Request #16: Small buffer optimization

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/include/bitlib/bit-iterator/bit_iterator_adapter.hpp

// ============================== BIT ITERATOR ============================== //
// Project:         The C++ Bit Library
// Name:            bit_iterator_adapter.hpp
// Description:     A class representing an iterator on bit sequences
// Creator:         Vincent Reverdy
// Contributor(s):  Vincent Reverdy [2015-2017]
// License:         BSD 3-Clause License
// ========================================================================== //
#ifndef _BIT_ITERATOR_ADAPTER_HPP_INCLUDED
#define _BIT_ITERATOR_ADAPTER_HPP_INCLUDED
// ========================================================================== //



// ================================ PREAMBLE ================================ //
// C++ standard library
#include <compare>
#include <concepts>
#include <cstddef>
#include <iterator>
#include <type_traits>

#include "bitlib/bit-containers/bit_bitsof.hpp"
#include "bitlib/bit_concepts.hpp"
// Project sources
#include "bit_details.hpp"
#include "bit_reference.hpp"
// Third-party libraries
// Miscellaneous
namespace bit {

/* ****************************** BIT ITERATOR ****************************** */
// Bit iterator class definition
template <typename Iterator, typename BaseIterator>
class bit_iterator_adapter {
  template <typename, typename>
  friend class bit_iterator_adapter;

  // Assertions
 private:
  using _traits_t = _cv_iterator_traits<Iterator>;
  static constexpr bool big_to_small = sizeof(typename _cv_iterator_traits<BaseIterator>::value_type) >
                                       sizeof(typename _cv_iterator_traits<Iterator>::value_type);
  static constexpr size_t ratio = big_to_small ? (sizeof(typename _cv_iterator_traits<BaseIterator>::value_type) /
                                                  sizeof(typename _cv_iterator_traits<Iterator>::value_type))
                                               : (sizeof(typename _cv_iterator_traits<Iterator>::value_type) /
                                                  sizeof(typename _cv_iterator_traits<BaseIterator>::value_type));

  // Types
 public:
  using iterator_type = Iterator;
  using base_iterator_type = BaseIterator;
  using word_type = typename _traits_t::value_type;
  using iterator_category = typename _traits_t::iterator_category;
  using value_type = typename _traits_t::value_type;
  using difference_type = std::ptrdiff_t;
  using pointer = typename _traits_t::pointer;
  using reference = typename _traits_t::reference;
  using size_type = std::size_t;

  // Lifecycle
 public:
  constexpr bit_iterator_adapter();
  constexpr bit_iterator_adapter(const bit_iterator_adapter<Iterator, BaseIterator>& other);
  template <typename T, typename U>
  constexpr bit_iterator_adapter(const bit_iterator_adapter<T, U>& other)
    requires std::constructible_from<iterator_type, T>;
  explicit constexpr bit_iterator_adapter(iterator_type i);
  constexpr bit_iterator_adapter(base_iterator_type i, size_type pos = 0);
  explicit constexpr bit_iterator_adapter(const pointer& ptr)
    requires std::constructible_from<iterator_type, word_type*>;

  // Assignment
 public:
  constexpr bit_iterator_adapter& operator=(const bit_iterator_adapter<Iterator, BaseIterator>& other);
  template <typename T, typename U>
  constexpr bit_iterator_adapter& operator=(const bit_iterator_adapter<T, U>& other);

  // Access
 public:
  constexpr reference operator*() const noexcept;
  constexpr pointer operator->() const noexcept;
  constexpr reference operator[](difference_type n) const;

  // Increment and decrement operators
 public:
  constexpr bit_iterator_adapter& operator++();
  constexpr bit_iterator_adapter& operator--();
  constexpr bit_iterator_adapter operator++(int);
  constexpr bit_iterator_adapter operator--(int);
  constexpr bit_iterator_adapter operator+(difference_type n) const;
  constexpr bit_iterator_adapter operator-(difference_type n) const;
  constexpr bit_iterator_adapter& operator+=(difference_type n);
  constexpr bit_iterator_adapter& operator-=(difference_type n);
  constexpr difference_type operator-(const bit_iterator_adapter&) const;

  // Underlying details
 public:
  constexpr base_iterator_type base() const;
  constexpr size_type position() const noexcept;

  bool operator==(const bit_iterator_adapter&) const = default;
  auto operator<=>(const bit_iterator_adapter&) const = default;
  // Implementation details: data members
 private:
  base_iterator_type _current;
  size_type _position;

  // Non-member arithmetic operators
  template <typename T, typename U>
  friend constexpr bit_iterator_adapter<T, U> operator+(
      typename bit_iterator_adapter<T, U>::difference_type n,
      const bit_iterator_adapter<T, U>& i);
  template <typename T, typename U, typename V, typename W>
  friend constexpr typename std::common_type<
      typename bit_iterator_adapter<T, U>::difference_type,
      typename bit_iterator_adapter<V, W>::difference_type>::type
  operator-(
      const bit_iterator_adapter<T, U>& lhs,
      const bit_iterator_adapter<V, W>& rhs);
};
/* ************************************************************************** */



// ------------------------ BIT ITERATOR: LIFECYCLE ------------------------- //
// Implicitly default constructs a bit iterator
template <typename Iterator, typename BaseIterator>
constexpr bit_iterator_adapter<Iterator, BaseIterator>::bit_iterator_adapter()
    : _current(), _position() {
}

// Implicitly constructs a bit iterator from another bit iterator
template <typename Iterator, typename BaseIterator>
constexpr bit_iterator_adapter<Iterator, BaseIterator>::bit_iterator_adapter(const bit_iterator_adapter<Iterator, BaseIterator>& other)
    : _current(other.base()), _position(other.position()) {
  assert(_position < ratio);
}

template <typename Iterator, typename BaseIterator>
template <typename T, typename U>
constexpr bit_iterator_adapter<Iterator, BaseIterator>::bit_iterator_adapter(const bit_iterator_adapter<T, U>& other)
  requires std::constructible_from<iterator_type, T>
    : _current(other.base()), _position(other.position()) {
  assert(_position < ratio);
}

// Explicitly constructs an aligned bit iterator from an iterator
template <typename Iterator, typename BaseIterator>
constexpr bit_iterator_adapter<Iterator, BaseIterator>::bit_iterator_adapter(const iterator_type i)
    : _current(reinterpret_cast<BaseIterator>(i)), _position(0) {
}

// Explicitly constructs an unaligned bit iterator from an iterator
template <typename Iterator, typename BaseIterator>
constexpr bit_iterator_adapter<Iterator, BaseIterator>::bit_iterator_adapter(const base_iterator_type i, size_type pos)
    : _current(i), _position((assert(pos < binary_digits<word_type>::value), pos)) {
}

// Explicitly constructs an unaligned bit iterator from a pointer
template <typename Iterator, typename BaseIterator>
constexpr bit_iterator_adapter<Iterator, BaseIterator>::bit_iterator_adapter(const pointer& ptr)
  requires std::constructible_from<iterator_type, word_type*>
    : _current(ptr._current), _position(ptr.position()) {
  assert(_position < ratio);
}
// -------------------------------------------------------------------------- //



// ------------------------ BIT ITERATOR: ASSIGNMENT ------------------------ //
// Assigns a bit iterator to the bit iterator
template <typename Iterator, typename BaseIterator>
constexpr bit_iterator_adapter<Iterator, BaseIterator>& bit_iterator_adapter<Iterator, BaseIterator>::operator=(
    const bit_iterator_adapter<Iterator, BaseIterator>& other) {
  _current = other._current;
  _position = other._position;
  assert(_position < ratio);
  return *this;
}

// Assigns a bit iterator to the bit iterator
template <typename Iterator, typename BaseIterator>
template <typename T, typename U>
constexpr bit_iterator_adapter<Iterator, BaseIterator>& bit_iterator_adapter<Iterator, BaseIterator>::operator=(
    const bit_iterator_adapter<T, U>& other) {
  _current = other._current;
  _position = other._position;
  assert(_position < ratio);
  return *this;
}
// -------------------------------------------------------------------------- //



// -------------------------- BIT ITERATOR: ACCESS -------------------------- //
// Gets a bit reference from the bit iterator
template <typename Iterator, typename BaseIterator>
constexpr typename bit_iterator_adapter<Iterator, BaseIterator>::reference
bit_iterator_adapter<Iterator, BaseIterator>::operator*() const noexcept {
  return reference(reinterpret_cast<word_type*>(&(*_current))[_position]);
}

// Gets a pointer to a bit
template <typename Iterator, typename BaseIterator>
constexpr typename bit_iterator_adapter<Iterator, BaseIterator>::pointer bit_iterator_adapter<Iterator, BaseIterator>::operator->() const noexcept {
  return pointer(&reinterpret_cast<word_type*>(&(*_current))[_position]);
}

// Gets a bit reference, decrementing or incrementing the iterator
template <typename Iterator, typename BaseIterator>
constexpr typename bit_iterator_adapter<Iterator, BaseIterator>::reference bit_iterator_adapter<Iterator, BaseIterator>::operator[](difference_type n) const {
  const difference_type sum = _position + n;
  difference_type diff = sum / ratio;
  if (sum < 0 && diff * ratio != sum) {
    --diff;
  }
  return reference(reinterpret_cast<Iterator>(&(*std::next(_current, diff)))[sum - diff * ratio]);
}
// -------------------------------------------------------------------------- //



// ------------- BIT ITERATOR: INCREMENT AND DECREMENT OPERATORS ------------ //
// Increments the bit iterator and returns it
template <typename Iterator, typename BaseIterator>
constexpr bit_iterator_adapter<Iterator, BaseIterator>& bit_iterator_adapter<Iterator, BaseIterator>::operator++() {
  if (_position + 1 < ratio) {
    ++_position;
  } else {
    ++_current;
    _position = 0;
  }
  return *this;
}

// Decrements the bit iterator and returns it
template <typename Iterator, typename BaseIterator>
constexpr bit_iterator_adapter<Iterator, BaseIterator>& bit_iterator_adapter<Iterator, BaseIterator>::operator--() {
  if (_position) {
    --_position;
  } else {
    --_current;
    _position = ratio - 1;
  }
  return *this;
}

// Increments the bit iterator and returns the old one
template <typename Iterator, typename BaseIterator>
constexpr bit_iterator_adapter<Iterator, BaseIterator> bit_iterator_adapter<Iterator, BaseIterator>::operator++(int) {
  bit_iterator_adapter old = *this;
  ++(*this);
  return old;
}

// Decrements the bit iterator and returns the old one
template <typename Iterator, typename BaseIterator>
constexpr bit_iterator_adapter<Iterator, BaseIterator> bit_iterator_adapter<Iterator, BaseIterator>::operator--(int) {
  bit_iterator_adapter old = *this;
  --(*this);
  return old;
}

// Looks forward several bits and gets an iterator at this position
template <typename Iterator, typename BaseIterator>
constexpr bit_iterator_adapter<Iterator, BaseIterator> bit_iterator_adapter<Iterator, BaseIterator>::operator+(difference_type n) const {
  const difference_type sum = _position + n;
  difference_type diff = sum / ratio;
  if (sum < 0 && diff * ratio != sum) {
    --diff;
  }
  return bit_iterator_adapter(&reinterpret_cast<Iterator>(&(*std::next(_current, diff)))[sum - diff * ratio], sum - diff * ratio);
}

// Looks backward several bits and gets an iterator at this position
template <typename Iterator, typename BaseIterator>
constexpr bit_iterator_adapter<Iterator, BaseIterator> bit_iterator_adapter<Iterator, BaseIterator>::operator-(difference_type n) const {
  const difference_type sum = _position - n;
  difference_type diff = sum / ratio;
  if (sum < 0 && diff * ratio != sum) {
    --diff;
  }
  return bit_iterator_adapter(&reinterpret_cast<Iterator>(&(*std::next(_current, diff)))[sum - diff * ratio], sum - diff * ratio);
}

// Increments the iterator by several bits and returns it
template <typename Iterator, typename BaseIterator>
constexpr bit_iterator_adapter<Iterator, BaseIterator>& bit_iterator_adapter<Iterator, BaseIterator>::operator+=(difference_type n) {
  const difference_type sum = _position + n;
  difference_type diff = sum / ratio;
  if (sum < 0 && diff * ratio != sum) {
    --diff;
  }
  _current = std::next(_current, diff);
  _position = (sum - diff * ratio);
  return *this;
}

// Decrements the iterator by several bits and returns it
template <typename Iterator, typename BaseIterator>
constexpr bit_iterator_adapter<Iterator, BaseIterator>& bit_iterator_adapter<Iterator, BaseIterator>::operator-=(difference_type n) {
  const difference_type sum = _position - n;
  difference_type diff = sum / ratio;
  if (sum < 0 && diff * ratio != sum) {
    --diff;
  }
  _current = std::next(_current, diff);
  _position = (sum - diff * ratio);
  return *this;
}
// -------------------------------------------------------------------------- //

template <typename Iterator, typename BaseIterator>
constexpr bit_iterator_adapter<Iterator, BaseIterator>::difference_type
bit_iterator_adapter<Iterator, BaseIterator>::operator-(const bit_iterator_adapter<Iterator, BaseIterator>& other) const {
  return (_current - other._current) * ratio + (_position - other._position);
}

// -------------------- BIT ITERATOR: UNDERLYING DETAILS -------------------- //
// Returns a copy of the underlying iterator
template <typename Iterator, typename BaseIterator>
constexpr typename bit_iterator_adapter<Iterator, BaseIterator>::base_iterator_type bit_iterator_adapter<Iterator, BaseIterator>::base() const {
  return _current;
}

// Returns the position of the bit within the underlying word
template <typename Iterator, typename BaseIterator>
constexpr typename bit_iterator_adapter<Iterator, BaseIterator>::size_type bit_iterator_adapter<Iterator, BaseIterator>::position() const noexcept {
  return _position;
}

// -------------- BIT ITERATOR: NON-MEMBER ARITHMETIC OPERATORS ------------- //
// Advances the bit iterator several times
template <typename T, typename U>
constexpr bit_iterator_adapter<T, U> operator+(typename bit_iterator_adapter<T, U>::difference_type n, const bit_iterator_adapter<T, U>& i) {
  return i + n;
}

// Computes the distance in bits separating two bit iterators
template <typename T, typename U, typename V, typename W>
constexpr typename std::common_type<
    typename bit_iterator_adapter<T, U>::difference_type,
    typename bit_iterator_adapter<V, W>::difference_type>::type
operator-(const bit_iterator_adapter<T, U>& lhs, const bit_iterator_adapter<V, W>& rhs) {
  using lhs_utype = typename bit_iterator_adapter<T, U>::word_type;
  using rhs_utype = typename bit_iterator_adapter<V, W>::word_type;
  using lhs_type = typename bit_iterator_adapter<T, U>::difference_type;
  using rhs_type = typename bit_iterator_adapter<V, W>::difference_type;
  using size_type = typename std::common_type<typename bit_iterator_adapter<T, U>::size_type,
                                              typename bit_iterator_adapter<V, W>::size_type>::type;
  using difference_type = typename std::common_type<typename bit_iterator_adapter<T, U>::difference_type,
                                                    typename bit_iterator_adapter<V, W>::difference_type>::type;
  constexpr size_type lhs_ratio = bit_iterator_adapter<T, U>::ratio;
  constexpr size_type rhs_ratio = bit_iterator_adapter<V, W>::ratio;
  static_assert(lhs_ratio == rhs_ratio, "");
  const difference_type main = lhs._current - rhs._current;
  return main * lhs_ratio + (lhs._position - rhs._position);
}

//static_assert(bit_iterator_adapter_c<bit_iterator_adapter<uint8_t*>>, "bit_iterator_adapter does not satisfy bit_iterator_adapter_c concept!");
//static_assert(bit_pointer_c<bit_pointer<uint8_t>, bit_reference<uint8_t>>, "bit_pointer does not satisfy bit_pointer_c concept!");
//static_assert(bit_iterator_adapter_c<bit_pointer<uint8_t>>, "bit_pointer does not satisfy bit_iterator_adapter_c concept!");

// ========================================================================== //
} // namespace bit
#endif // _BIT_ITERATOR_ADAPTER_HPP_INCLUDED
// ========================================================================== //

1	// ============================== BIT ITERATOR ============================== //
2	// Project: The C++ Bit Library
3	// Name: bit_iterator_adapter.hpp
4	// Description: A class representing an iterator on bit sequences
5	// Creator: Vincent Reverdy
6	// Contributor(s): Vincent Reverdy [2015-2017]
7	// License: BSD 3-Clause License
8	// ========================================================================== //
9	#ifndef _BIT_ITERATOR_ADAPTER_HPP_INCLUDED
10	#define _BIT_ITERATOR_ADAPTER_HPP_INCLUDED
11	// ========================================================================== //
12
13
14
15	// ================================ PREAMBLE ================================ //
16	// C++ standard library
17	#include <compare>
18	#include <concepts>
19	#include <cstddef>
20	#include <iterator>
21	#include <type_traits>
22
23	#include "bitlib/bit-containers/bit_bitsof.hpp"
24	#include "bitlib/bit_concepts.hpp"
25	// Project sources
26	#include "bit_details.hpp"
27	#include "bit_reference.hpp"
28	// Third-party libraries
29	// Miscellaneous
30	namespace bit {
31
32	/* **************************** BIT ITERATOR **************************** */
33	// Bit iterator class definition
34	template <typename Iterator, typename BaseIterator>
35	class bit_iterator_adapter {
36	template <typename, typename>
37	friend class bit_iterator_adapter;
38
39	// Assertions
40	private:
41	using _traits_t = _cv_iterator_traits<Iterator>;
42	static constexpr bool big_to_small = sizeof(typename _cv_iterator_traits<BaseIterator>::value_type) >
43	sizeof(typename _cv_iterator_traits<Iterator>::value_type);
44	static constexpr size_t ratio = big_to_small ? (sizeof(typename _cv_iterator_traits<BaseIterator>::value_type) /
45	sizeof(typename _cv_iterator_traits<Iterator>::value_type))
46	: (sizeof(typename _cv_iterator_traits<Iterator>::value_type) /
47	sizeof(typename _cv_iterator_traits<BaseIterator>::value_type));
48
49	// Types
50	public:
51	using iterator_type = Iterator;
52	using base_iterator_type = BaseIterator;
53	using word_type = typename _traits_t::value_type;
54	using iterator_category = typename _traits_t::iterator_category;
55	using value_type = typename _traits_t::value_type;
56	using difference_type = std::ptrdiff_t;
57	using pointer = typename _traits_t::pointer;
58	using reference = typename _traits_t::reference;
59	using size_type = std::size_t;
60
61	// Lifecycle
62	public:
63	constexpr bit_iterator_adapter();
64	constexpr bit_iterator_adapter(const bit_iterator_adapter<Iterator, BaseIterator>& other);
65	template <typename T, typename U>
66	constexpr bit_iterator_adapter(const bit_iterator_adapter<T, U>& other)
67	requires std::constructible_from<iterator_type, T>;
68	explicit constexpr bit_iterator_adapter(iterator_type i);
69	constexpr bit_iterator_adapter(base_iterator_type i, size_type pos = 0);
70	explicit constexpr bit_iterator_adapter(const pointer& ptr)
71	requires std::constructible_from<iterator_type, word_type*>;
72
73	// Assignment
74	public:
75	constexpr bit_iterator_adapter& operator=(const bit_iterator_adapter<Iterator, BaseIterator>& other);
76	template <typename T, typename U>
77	constexpr bit_iterator_adapter& operator=(const bit_iterator_adapter<T, U>& other);
78
79	// Access
80	public:
81	constexpr reference operator*() const noexcept;
82	constexpr pointer operator->() const noexcept;
83	constexpr reference operator[](difference_type n) const;
84
85	// Increment and decrement operators
86	public:
87	constexpr bit_iterator_adapter& operator++();
88	constexpr bit_iterator_adapter& operator--();
89	constexpr bit_iterator_adapter operator++(int);
90	constexpr bit_iterator_adapter operator--(int);
91	constexpr bit_iterator_adapter operator+(difference_type n) const;
92	constexpr bit_iterator_adapter operator-(difference_type n) const;
93	constexpr bit_iterator_adapter& operator+=(difference_type n);
94	constexpr bit_iterator_adapter& operator-=(difference_type n);
95	constexpr difference_type operator-(const bit_iterator_adapter&) const;
96
97	// Underlying details
98	public:
99	constexpr base_iterator_type base() const;
100	constexpr size_type position() const noexcept;
101
102	bool operator==(const bit_iterator_adapter&) const = default;	5✔
103	auto operator<=>(const bit_iterator_adapter&) const = default;
104	// Implementation details: data members
105	private:
106	base_iterator_type _current;	1✔
107	size_type _position;	1✔
108
109	// Non-member arithmetic operators
110	template <typename T, typename U>
111	friend constexpr bit_iterator_adapter<T, U> operator+(
112	typename bit_iterator_adapter<T, U>::difference_type n,
113	const bit_iterator_adapter<T, U>& i);
114	template <typename T, typename U, typename V, typename W>
115	friend constexpr typename std::common_type<
116	typename bit_iterator_adapter<T, U>::difference_type,
117	typename bit_iterator_adapter<V, W>::difference_type>::type
118	operator-(
119	const bit_iterator_adapter<T, U>& lhs,
120	const bit_iterator_adapter<V, W>& rhs);
121	};
122	/* ************************************************************************** */
123
124
125
126	// ------------------------ BIT ITERATOR: LIFECYCLE ------------------------- //
127	// Implicitly default constructs a bit iterator
128	template <typename Iterator, typename BaseIterator>
129	constexpr bit_iterator_adapter<Iterator, BaseIterator>::bit_iterator_adapter()
130	: _current(), _position() {
131	}
132
133	// Implicitly constructs a bit iterator from another bit iterator
134	template <typename Iterator, typename BaseIterator>
135	constexpr bit_iterator_adapter<Iterator, BaseIterator>::bit_iterator_adapter(const bit_iterator_adapter<Iterator, BaseIterator>& other)	25✔
136	: _current(other.base()), _position(other.position()) {	50✔
137	assert(_position < ratio);	50!
138	}	50✔
139
140	template <typename Iterator, typename BaseIterator>
141	template <typename T, typename U>
142	constexpr bit_iterator_adapter<Iterator, BaseIterator>::bit_iterator_adapter(const bit_iterator_adapter<T, U>& other)
143	requires std::constructible_from<iterator_type, T>
144	: _current(other.base()), _position(other.position()) {
145	assert(_position < ratio);
146	}
147
148	// Explicitly constructs an aligned bit iterator from an iterator
149	template <typename Iterator, typename BaseIterator>
150	constexpr bit_iterator_adapter<Iterator, BaseIterator>::bit_iterator_adapter(const iterator_type i)
151	: _current(reinterpret_cast<BaseIterator>(i)), _position(0) {
152	}
153
154	// Explicitly constructs an unaligned bit iterator from an iterator
155	template <typename Iterator, typename BaseIterator>
156	constexpr bit_iterator_adapter<Iterator, BaseIterator>::bit_iterator_adapter(const base_iterator_type i, size_type pos)	4✔
157	: _current(i), _position((assert(pos < binary_digits<word_type>::value), pos)) {	8!
158	}	8✔
159
160	// Explicitly constructs an unaligned bit iterator from a pointer
161	template <typename Iterator, typename BaseIterator>
162	constexpr bit_iterator_adapter<Iterator, BaseIterator>::bit_iterator_adapter(const pointer& ptr)
163	requires std::constructible_from<iterator_type, word_type*>
164	: _current(ptr._current), _position(ptr.position()) {
165	assert(_position < ratio);
166	}
167	// -------------------------------------------------------------------------- //
168
169
170
171	// ------------------------ BIT ITERATOR: ASSIGNMENT ------------------------ //
172	// Assigns a bit iterator to the bit iterator
173	template <typename Iterator, typename BaseIterator>
174	constexpr bit_iterator_adapter<Iterator, BaseIterator>& bit_iterator_adapter<Iterator, BaseIterator>::operator=(
NEW 175	const bit_iterator_adapter<Iterator, BaseIterator>& other) {
NEW 176	_current = other._current;	×
NEW 177	_position = other._position;	×
NEW 178	assert(_position < ratio);	×
NEW 179	return *this;	×
NEW 180	}
181
182	// Assigns a bit iterator to the bit iterator
183	template <typename Iterator, typename BaseIterator>
184	template <typename T, typename U>
185	constexpr bit_iterator_adapter<Iterator, BaseIterator>& bit_iterator_adapter<Iterator, BaseIterator>::operator=(
186	const bit_iterator_adapter<T, U>& other) {
187	_current = other._current;
188	_position = other._position;
189	assert(_position < ratio);
190	return *this;
191	}
192	// -------------------------------------------------------------------------- //
193
194
195
196	// -------------------------- BIT ITERATOR: ACCESS -------------------------- //
197	// Gets a bit reference from the bit iterator
198	template <typename Iterator, typename BaseIterator>
199	constexpr typename bit_iterator_adapter<Iterator, BaseIterator>::reference
200	bit_iterator_adapter<Iterator, BaseIterator>::operator*() const noexcept {	14✔
201	return reference(reinterpret_cast<word_type>(&(_current))[_position]);	14✔
202	}	7✔
203
204	// Gets a pointer to a bit
205	template <typename Iterator, typename BaseIterator>
206	constexpr typename bit_iterator_adapter<Iterator, BaseIterator>::pointer bit_iterator_adapter<Iterator, BaseIterator>::operator->() const noexcept {
207	return pointer(&reinterpret_cast<word_type>(&(_current))[_position]);
208	}
209
210	// Gets a bit reference, decrementing or incrementing the iterator
211	template <typename Iterator, typename BaseIterator>
212	constexpr typename bit_iterator_adapter<Iterator, BaseIterator>::reference bit_iterator_adapter<Iterator, BaseIterator>::operator[](difference_type n) const {
213	const difference_type sum = _position + n;
214	difference_type diff = sum / ratio;
215	if (sum < 0 && diff * ratio != sum) {
216	--diff;
217	}
218	return reference(reinterpret_cast<Iterator>(&(std::next(_current, diff)))[sum - diff ratio]);
219	}
220	// -------------------------------------------------------------------------- //
221
222
223
224	// ------------- BIT ITERATOR: INCREMENT AND DECREMENT OPERATORS ------------ //
225	// Increments the bit iterator and returns it
226	template <typename Iterator, typename BaseIterator>
227	constexpr bit_iterator_adapter<Iterator, BaseIterator>& bit_iterator_adapter<Iterator, BaseIterator>::operator++() {	4✔
228	if (_position + 1 < ratio) {	4!
229	++_position;	2✔
230	} else {	1✔
231	++_current;	2✔
232	_position = 0;	2✔
233	}	1✔
234	return *this;	4✔
235	}	2✔
236
237	// Decrements the bit iterator and returns it
238	template <typename Iterator, typename BaseIterator>
239	constexpr bit_iterator_adapter<Iterator, BaseIterator>& bit_iterator_adapter<Iterator, BaseIterator>::operator--() {
240	if (_position) {
241	--_position;
242	} else {
243	--_current;
244	_position = ratio - 1;
245	}
246	return *this;
247	}
248
249	// Increments the bit iterator and returns the old one
250	template <typename Iterator, typename BaseIterator>
251	constexpr bit_iterator_adapter<Iterator, BaseIterator> bit_iterator_adapter<Iterator, BaseIterator>::operator++(int) {	2✔
252	bit_iterator_adapter old = *this;	2✔
253	++(*this);	2✔
254	return old;	3✔
255	}	1✔
256
257	// Decrements the bit iterator and returns the old one
258	template <typename Iterator, typename BaseIterator>
259	constexpr bit_iterator_adapter<Iterator, BaseIterator> bit_iterator_adapter<Iterator, BaseIterator>::operator--(int) {
260	bit_iterator_adapter old = *this;
261	--(*this);
262	return old;
263	}
264
265	// Looks forward several bits and gets an iterator at this position
266	template <typename Iterator, typename BaseIterator>
267	constexpr bit_iterator_adapter<Iterator, BaseIterator> bit_iterator_adapter<Iterator, BaseIterator>::operator+(difference_type n) const {
268	const difference_type sum = _position + n;
269	difference_type diff = sum / ratio;
270	if (sum < 0 && diff * ratio != sum) {
271	--diff;
272	}
273	return bit_iterator_adapter(&reinterpret_cast<Iterator>(&(std::next(_current, diff)))[sum - diff ratio], sum - diff * ratio);
274	}
275
276	// Looks backward several bits and gets an iterator at this position
277	template <typename Iterator, typename BaseIterator>
278	constexpr bit_iterator_adapter<Iterator, BaseIterator> bit_iterator_adapter<Iterator, BaseIterator>::operator-(difference_type n) const {
279	const difference_type sum = _position - n;
280	difference_type diff = sum / ratio;
281	if (sum < 0 && diff * ratio != sum) {
282	--diff;
283	}
284	return bit_iterator_adapter(&reinterpret_cast<Iterator>(&(std::next(_current, diff)))[sum - diff ratio], sum - diff * ratio);
285	}
286
287	// Increments the iterator by several bits and returns it
288	template <typename Iterator, typename BaseIterator>
289	constexpr bit_iterator_adapter<Iterator, BaseIterator>& bit_iterator_adapter<Iterator, BaseIterator>::operator+=(difference_type n) {	2✔
290	const difference_type sum = _position + n;	2✔
291	difference_type diff = sum / ratio;	2✔
292	if (sum < 0 && diff * ratio != sum) {	2!
NEW 293	--diff;	×
NEW 294	}
295	_current = std::next(_current, diff);	3✔
296	_position = (sum - diff * ratio);	2✔
297	return *this;	3✔
298	}	1✔
299
300	// Decrements the iterator by several bits and returns it
301	template <typename Iterator, typename BaseIterator>
302	constexpr bit_iterator_adapter<Iterator, BaseIterator>& bit_iterator_adapter<Iterator, BaseIterator>::operator-=(difference_type n) {
303	const difference_type sum = _position - n;
304	difference_type diff = sum / ratio;
305	if (sum < 0 && diff * ratio != sum) {
306	--diff;
307	}
308	_current = std::next(_current, diff);
309	_position = (sum - diff * ratio);
310	return *this;
311	}
312	// -------------------------------------------------------------------------- //
313
314	template <typename Iterator, typename BaseIterator>
315	constexpr bit_iterator_adapter<Iterator, BaseIterator>::difference_type
316	bit_iterator_adapter<Iterator, BaseIterator>::operator-(const bit_iterator_adapter<Iterator, BaseIterator>& other) const {	6✔
317	return (_current - other._current) * ratio + (_position - other._position);	6✔
318	}	3✔
319
320	// -------------------- BIT ITERATOR: UNDERLYING DETAILS -------------------- //
321	// Returns a copy of the underlying iterator
322	template <typename Iterator, typename BaseIterator>
323	constexpr typename bit_iterator_adapter<Iterator, BaseIterator>::base_iterator_type bit_iterator_adapter<Iterator, BaseIterator>::base() const {	50✔
324	return _current;	50✔
325	}	25✔
326
327	// Returns the position of the bit within the underlying word
328	template <typename Iterator, typename BaseIterator>
329	constexpr typename bit_iterator_adapter<Iterator, BaseIterator>::size_type bit_iterator_adapter<Iterator, BaseIterator>::position() const noexcept {	50✔
330	return _position;	50✔
331	}	25✔
332
333	// -------------- BIT ITERATOR: NON-MEMBER ARITHMETIC OPERATORS ------------- //
334	// Advances the bit iterator several times
335	template <typename T, typename U>
336	constexpr bit_iterator_adapter<T, U> operator+(typename bit_iterator_adapter<T, U>::difference_type n, const bit_iterator_adapter<T, U>& i) {
337	return i + n;
338	}
339
340	// Computes the distance in bits separating two bit iterators
341	template <typename T, typename U, typename V, typename W>
342	constexpr typename std::common_type<
343	typename bit_iterator_adapter<T, U>::difference_type,
344	typename bit_iterator_adapter<V, W>::difference_type>::type
345	operator-(const bit_iterator_adapter<T, U>& lhs, const bit_iterator_adapter<V, W>& rhs) {
346	using lhs_utype = typename bit_iterator_adapter<T, U>::word_type;
347	using rhs_utype = typename bit_iterator_adapter<V, W>::word_type;
348	using lhs_type = typename bit_iterator_adapter<T, U>::difference_type;
349	using rhs_type = typename bit_iterator_adapter<V, W>::difference_type;
350	using size_type = typename std::common_type<typename bit_iterator_adapter<T, U>::size_type,
351	typename bit_iterator_adapter<V, W>::size_type>::type;
352	using difference_type = typename std::common_type<typename bit_iterator_adapter<T, U>::difference_type,
353	typename bit_iterator_adapter<V, W>::difference_type>::type;
354	constexpr size_type lhs_ratio = bit_iterator_adapter<T, U>::ratio;
355	constexpr size_type rhs_ratio = bit_iterator_adapter<V, W>::ratio;
356	static_assert(lhs_ratio == rhs_ratio, "");
357	const difference_type main = lhs._current - rhs._current;
358	return main * lhs_ratio + (lhs._position - rhs._position);
359	}
360
361	//static_assert(bit_iterator_adapter_c<bit_iterator_adapter<uint8_t*>>, "bit_iterator_adapter does not satisfy bit_iterator_adapter_c concept!");
362	//static_assert(bit_pointer_c<bit_pointer<uint8_t>, bit_reference<uint8_t>>, "bit_pointer does not satisfy bit_pointer_c concept!");
363	//static_assert(bit_iterator_adapter_c<bit_pointer<uint8_t>>, "bit_pointer does not satisfy bit_iterator_adapter_c concept!");
364
365	// ========================================================================== //
366	} // namespace bit
367	#endif // _BIT_ITERATOR_ADAPTER_HPP_INCLUDED
368	// ========================================================================== //

PeterCDMcLean / BitLib / 15380630124

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