core.hpp 134 KB
Newer Older
Gauthier Quesnel's avatar
Gauthier Quesnel committed
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
// Copyright (c) 2020 INRA Distributed under the Boost Software License,
// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)

#ifndef ORG_VLEPROJECT_IRRITATOR_2020
#define ORG_VLEPROJECT_IRRITATOR_2020

#include <algorithm>
#include <limits>
#include <string_view>

#include <cassert>
#include <cmath>
#include <cstdint>
#include <cstring>
K-H-Ismail's avatar
K-H-Ismail committed
16

Gauthier Quesnel's avatar
Gauthier Quesnel committed
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
namespace irt {

using i8 = int8_t;
using i16 = int16_t;
using i32 = int32_t;
using i64 = int64_t;
using u8 = uint8_t;
using u16 = uint16_t;
using u32 = uint32_t;
using u64 = uint64_t;
using sz = size_t;

/*****************************************************************************
 *
 * Return status of many function
 *
 ****************************************************************************/

enum class status
{
    success,

Gauthier Quesnel's avatar
Gauthier Quesnel committed
39
40
    unknown_dynamics,

Gauthier Quesnel's avatar
Gauthier Quesnel committed
41
42
43
44
45
46
47
48
49
50
51
52
53
54
    block_allocator_bad_capacity,
    block_allocator_not_enough_memory,

    head_allocator_bad_capacity,
    head_allocator_not_enough_memory,

    simulation_not_enough_model,
    simulation_not_enough_memory_message_list_allocator,
    simulation_not_enough_memory_input_port_list_allocator,
    simulation_not_enough_memory_output_port_list_allocator,

    data_array_init_capacity_error,
    data_array_not_enough_memory,

55
56
57
    data_array_archive_init_capacity_error,
    data_array_archive_not_enough_memory,

58
59
60
61
    array_init_capacity_zero,
    array_init_capacity_too_big,
    array_init_not_enough_memory,

62
63
64
65
    vector_init_capacity_zero,
    vector_init_capacity_too_big,
    vector_init_not_enough_memory,

Gauthier Quesnel's avatar
Gauthier Quesnel committed
66
67
68
69
    dynamics_unknown_id,
    dynamics_unknown_port_id,
    dynamics_not_enough_memory,

Gauthier Quesnel's avatar
Gauthier Quesnel committed
70
71
72
73
    model_connect_output_port_unknown,
    model_connect_input_port_unknown,
    model_connect_already_exist,

74
75
76
77
78
79
80
81
    model_adder_empty_init_message,
    model_adder_bad_init_message,
    model_adder_bad_external_message,

    model_mult_empty_init_message,
    model_mult_bad_init_message,
    model_mult_bad_external_message,

Gauthier Quesnel's avatar
Gauthier Quesnel committed
82
83
84
85
    model_integrator_internal_error,
    model_integrator_output_error,
    model_integrator_running_without_x_dot,
    model_integrator_ta_with_bad_x_dot,
86
87
    model_integrator_bad_external_message,

Gauthier Quesnel's avatar
Gauthier Quesnel committed
88
89
90
91
    model_quantifier_bad_quantum_parameter,
    model_quantifier_bad_archive_length_parameter,
    model_quantifier_shifting_value_neg,
    model_quantifier_shifting_value_less_1,
92
    model_quantifier_bad_external_message,
Gauthier Quesnel's avatar
Gauthier Quesnel committed
93

94
    model_cross_bad_external_message,
K-H-Ismail's avatar
K-H-Ismail committed
95
96

    model_time_func_bad_init_message,
Gauthier Quesnel's avatar
Gauthier Quesnel committed
97

98
    gui_not_enough_memory,
Gauthier Quesnel's avatar
Gauthier Quesnel committed
99
100
101
102
103
104
105
106

    io_file_format_error,
    io_file_format_model_error,
    io_file_format_model_number_error,
    io_file_format_model_unknown,
    io_file_format_dynamics_unknown,
    io_file_format_dynamics_limit_reach,
    io_file_format_dynamics_init_error
Gauthier Quesnel's avatar
Gauthier Quesnel committed
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
};

constexpr bool
is_success(status s) noexcept
{
    return s == status::success;
}

constexpr bool
is_bad(status s) noexcept
{
    return s != status::success;
}

template<typename... Args>
constexpr bool
is_status_equal(status s, Args... args) noexcept
{
    return ((s == args) || ... || false);
}

#ifndef NDEBUG
Gauthier Quesnel's avatar
Gauthier Quesnel committed
129
#if (defined(__i386__) || defined(__x86_64__)) && defined(__GNUC__) &&         \
130
  __GNUC__ >= 2
Gauthier Quesnel's avatar
Gauthier Quesnel committed
131
132
133
#define irt_breakpoint()                                                       \
    do {                                                                       \
        __asm__ __volatile__("int $03");                                       \
134
135
    } while (0)
#elif (defined(_MSC_VER) || defined(__DMC__)) && defined(_M_IX86)
Gauthier Quesnel's avatar
Gauthier Quesnel committed
136
137
138
#define irt_breakpoint()                                                       \
    do {                                                                       \
        __asm int 3h                                                           \
139
140
    } while (0)
#elif defined(_MSC_VER)
Gauthier Quesnel's avatar
Gauthier Quesnel committed
141
142
143
#define irt_breakpoint()                                                       \
    do {                                                                       \
        __debugbreak();                                                        \
144
    } while (0)
Gauthier Quesnel's avatar
Gauthier Quesnel committed
145
#elif defined(__alpha__) && !defined(__osf__) && defined(__GNUC__) &&          \
146
  __GNUC__ >= 2
Gauthier Quesnel's avatar
Gauthier Quesnel committed
147
148
149
#define irt_breakpoint()                                                       \
    do {                                                                       \
        __asm__ __volatile__("bpt");                                           \
150
151
    } while (0)
#elif defined(__APPLE__)
Gauthier Quesnel's avatar
Gauthier Quesnel committed
152
153
154
#define irt_breakpoint()                                                       \
    do {                                                                       \
        __builtin_trap();                                                      \
155
156
    } while (0)
#else /* !__i386__ && !__alpha__ */
Gauthier Quesnel's avatar
Gauthier Quesnel committed
157
158
159
#define irt_breakpoint()                                                       \
    do {                                                                       \
        raise(SIGTRAP);                                                        \
160
161
    } while (0)
#endif /* __i386__ */
Gauthier Quesnel's avatar
Gauthier Quesnel committed
162
#else
Gauthier Quesnel's avatar
Gauthier Quesnel committed
163
164
#define irt_breakpoint()                                                       \
    do {                                                                       \
165
    } while (0)
Gauthier Quesnel's avatar
Gauthier Quesnel committed
166
167
#endif

Gauthier Quesnel's avatar
Gauthier Quesnel committed
168
169
170
171
#define irt_bad_return(status__)                                               \
    do {                                                                       \
        irt_breakpoint();                                                      \
        return status__;                                                       \
172
173
    } while (0)

Gauthier Quesnel's avatar
Gauthier Quesnel committed
174
#define irt_return_if_bad(expr__)                                              \
Gauthier Quesnel's avatar
Gauthier Quesnel committed
175
    do {                                                                       \
Gauthier Quesnel's avatar
Gauthier Quesnel committed
176
        auto status__ = (expr__);                                              \
Gauthier Quesnel's avatar
Gauthier Quesnel committed
177
178
179
180
        if (status__ != status::success) {                                     \
            irt_breakpoint();                                                  \
            return status__;                                                   \
        }                                                                      \
181
182
    } while (0)

Gauthier Quesnel's avatar
Gauthier Quesnel committed
183
184
185
186
187
188
#define irt_return_if_fail(expr__, status__)                                   \
    do {                                                                       \
        if (!(expr__)) {                                                       \
            irt_breakpoint();                                                  \
            return status__;                                                   \
        }                                                                      \
189
    } while (0)
Gauthier Quesnel's avatar
Gauthier Quesnel committed
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226

inline status
check_return(status s) noexcept
{
    if (s != status::success)
        irt_breakpoint();

    return s;
}

/*****************************************************************************
 *
 * Definition of Time
 *
 * TODO:
 * - enable template definition of float or [float|double,bool absolute]
 *   representation of time?
 *
 ****************************************************************************/

using time = double;

template<typename T>
struct time_domain
{};

template<>
struct time_domain<time>
{
    using time_type = time;

    static constexpr const double infinity =
      std::numeric_limits<double>::infinity();
    static constexpr const double negative_infinity =
      -std::numeric_limits<double>::infinity();
    static constexpr const double zero = 0;

227
    static constexpr bool is_infinity(time t) noexcept
Gauthier Quesnel's avatar
Gauthier Quesnel committed
228
229
230
231
    {
        return t == infinity || t == negative_infinity;
    }

232
    static constexpr bool is_zero(time t) noexcept
Gauthier Quesnel's avatar
Gauthier Quesnel committed
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
    {
        return t == zero;
    }
};

/*****************************************************************************
 *
 * Small string
 *
 ****************************************************************************/

template<size_t length = 8>
class small_string
{
    char buffer_[length];
    u8 size_;

public:
Gauthier Quesnel's avatar
Gauthier Quesnel committed
251
252
    using iterator = char*;
    using const_iterator = const char*;
Gauthier Quesnel's avatar
Gauthier Quesnel committed
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
    using size_type = u8;

    static_assert(length > size_t{ 1 } && length < size_t{ 254 });

    constexpr small_string() noexcept
    {
        clear();
    }

    constexpr small_string(const small_string& str) noexcept
    {
        std::copy_n(str.buffer_, str.size_, buffer_);
        buffer_[str.size_] = '\0';
        size_ = str.size_;
    }

    constexpr small_string(small_string&& str) noexcept
    {
        std::copy_n(str.buffer_, str.size_, buffer_);
        buffer_[str.size_] = '\0';
        size_ = str.size_;
        str.clear();
    }

    constexpr small_string& operator=(const small_string& str) noexcept
    {
        if (&str != this) {
            std::copy_n(str.buffer_, str.size_, buffer_);
            buffer_[str.size_] = '\0';
            size_ = str.size_;
        }

        return *this;
    }

    constexpr small_string& operator=(small_string&& str) noexcept
    {
        if (&str != this) {
            std::copy_n(str.buffer_, str.size_, buffer_);
            buffer_[str.size_] = '\0';
            size_ = str.size_;
        }

        return *this;
    }

    constexpr small_string(const char* str) noexcept
    {
        std::strncpy(buffer_, str, length - 1);
        buffer_[length - 1] = '\0';
        size_ = static_cast<u8>(std::strlen(buffer_));
    }

    constexpr small_string(const std::string_view str) noexcept
    {
        assign(str);
    }

    constexpr bool empty() const noexcept
    {
        constexpr unsigned char zero{ 0 };

        return zero == size_;
    }

Gauthier Quesnel's avatar
Gauthier Quesnel committed
318
319
320
321
322
323
324
325
    constexpr void size(std::size_t sz) noexcept
    {
        if (sz <= capacity()) {
            buffer_[sz] = '\0';
            size_ = static_cast<u8>(sz);
        }
    }

Gauthier Quesnel's avatar
Gauthier Quesnel committed
326
327
328
329
330
331
332
    constexpr std::size_t size() const noexcept
    {
        return size_;
    }

    constexpr std::size_t capacity() const noexcept
    {
Gauthier Quesnel's avatar
Gauthier Quesnel committed
333
        return length - 1;
Gauthier Quesnel's avatar
Gauthier Quesnel committed
334
335
336
337
    }

    constexpr void assign(const std::string_view str) noexcept
    {
338
        const size_t copy_length = std::min(str.size(), length - 1);
Gauthier Quesnel's avatar
Gauthier Quesnel committed
339
340

        std::memcpy(buffer_, str.data(), copy_length);
341
342
343
        buffer_[copy_length] = '\0';

        size_ = static_cast<unsigned char>(copy_length);
Gauthier Quesnel's avatar
Gauthier Quesnel committed
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
    }

    constexpr std::string_view sv() const noexcept
    {
        return { buffer_, size_ };
    }

    constexpr void append(const std::string_view str) noexcept
    {
        const size_t remaining = length - size_;

        if (remaining) {
            size_t copy = std::min(remaining - 1, str.size());
            std::strncpy(buffer_ + size_, str.data(), copy);
            copy += size_;
            size_ = static_cast<unsigned char>(copy);
            assert(size_ < length);

            buffer_[size_] = '\0';
        }
    }

    constexpr void clear() noexcept
    {
        std::fill_n(buffer_, length, '\0');
        size_ = 0;
    }

    constexpr const char* c_str() const noexcept
    {
        return buffer_;
    }

Gauthier Quesnel's avatar
Gauthier Quesnel committed
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
    constexpr iterator begin() noexcept
    {
        return buffer_;
    }

    constexpr iterator end() noexcept
    {
        return buffer_ + size_;
    }

    constexpr const_iterator begin() const noexcept
    {
        return buffer_;
    }

    constexpr const_iterator end() const noexcept
    {
        return buffer_ + size_;
    }

Gauthier Quesnel's avatar
Gauthier Quesnel committed
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
    constexpr bool operator==(const small_string& rhs) const noexcept
    {
        return std::strncmp(buffer_, rhs.buffer_, length) == 0;
    }

    constexpr bool operator!=(const small_string& rhs) const noexcept
    {
        return std::strncmp(buffer_, rhs.buffer_, length) != 0;
    }

    constexpr bool operator>(const small_string& rhs) const noexcept
    {
        return std::strncmp(buffer_, rhs.buffer_, length) > 0;
    }

    constexpr bool operator<(const small_string& rhs) const noexcept
    {
        return std::strncmp(buffer_, rhs.buffer_, length) < 0;
    }

    constexpr bool operator==(const char* rhs) const noexcept
    {
        return std::strncmp(buffer_, rhs, length) == 0;
    }

    constexpr bool operator!=(const char* rhs) const noexcept
    {
        return std::strncmp(buffer_, rhs, length) != 0;
    }

    constexpr bool operator>(const char* rhs) const noexcept
    {
        return std::strncmp(buffer_, rhs, length) > 0;
    }

    constexpr bool operator<(const char* rhs) const noexcept
    {
        return std::strncmp(buffer_, rhs, length) < 0;
    }
};

/*****************************************************************************
 *
440
 * value
Gauthier Quesnel's avatar
Gauthier Quesnel committed
441
442
443
 *
 ****************************************************************************/

444
enum class value_type : i8
Gauthier Quesnel's avatar
Gauthier Quesnel committed
445
{
446
447
448
449
450
451
452
    none,
    integer_8,
    integer_32,
    integer_64,
    real_32,
    real_64
};
Gauthier Quesnel's avatar
Gauthier Quesnel committed
453

454
455
template<typename T, size_t length>
struct span
Gauthier Quesnel's avatar
Gauthier Quesnel committed
456
{
457
458
459
460
461
462
463
464
public:
    using value_type = T;
    using difference_type = std::ptrdiff_t;
    using pointer = T*;
    using reference = T&;
    using const_reference = T&;
    using iterator = T*;
    using const_iterator = const T*;
Gauthier Quesnel's avatar
Gauthier Quesnel committed
465

466
467
private:
    const T* data_;
Gauthier Quesnel's avatar
Gauthier Quesnel committed
468

469
470
471
472
public:
    constexpr span(const T* ptr)
      : data_(ptr)
    {}
Gauthier Quesnel's avatar
Gauthier Quesnel committed
473

474
475
476
477
    constexpr T* data() noexcept
    {
        return data_;
    }
Gauthier Quesnel's avatar
Gauthier Quesnel committed
478

479
480
481
482
    constexpr const T* data() const noexcept
    {
        return data_;
    }
Gauthier Quesnel's avatar
Gauthier Quesnel committed
483

484
485
486
487
    constexpr size_t size() const noexcept
    {
        return length;
    }
Gauthier Quesnel's avatar
Gauthier Quesnel committed
488

489
490
491
492
493
    constexpr T operator[](size_t i) const noexcept
    {
        assert(i < length);
        return data_[i];
    }
Gauthier Quesnel's avatar
Gauthier Quesnel committed
494

495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
    constexpr iterator begin() noexcept
    {
        return iterator{ data_ };
    }

    constexpr iterator end() noexcept
    {
        return iterator{ data_ + length };
    }

    constexpr const_iterator begin() const noexcept
    {
        return iterator{ data_ };
    }

    constexpr const_iterator end() const noexcept
    {
        return iterator{ data_ + length };
    }
};

template<class T, class... Rest>
constexpr bool
are_all_same() noexcept
Gauthier Quesnel's avatar
Gauthier Quesnel committed
519
{
520
    return (std::is_same_v<T, Rest> && ...);
Gauthier Quesnel's avatar
Gauthier Quesnel committed
521
522
}

523
struct message
Gauthier Quesnel's avatar
Gauthier Quesnel committed
524
{
525
526
    using size_type = std::size_t;
    using difference_type = std::ptrdiff_t;
Gauthier Quesnel's avatar
Gauthier Quesnel committed
527

528
    union
Gauthier Quesnel's avatar
Gauthier Quesnel committed
529
    {
530
531
532
533
534
        i8 integer_8[32];  // 32 bytes
        i32 integer_32[8]; // 8 * 4 bytes
        i64 integer_64[4]; // 4 * 8 bytes
        float real_32[8];  // 8 * 4 bytes
        double real_64[4]; // 4 * 8 bytes
Gauthier Quesnel's avatar
Gauthier Quesnel committed
535
536
    };

537
538
    u8 length;
    value_type type;
Gauthier Quesnel's avatar
Gauthier Quesnel committed
539

540
541
542
543
    constexpr std::size_t size() const noexcept
    {
        return length;
    }
Gauthier Quesnel's avatar
Gauthier Quesnel committed
544

545
546
547
548
549
    constexpr message() noexcept
      : integer_8{ 0 }
      , length{ 0 }
      , type{ value_type::none }
    {}
Gauthier Quesnel's avatar
Gauthier Quesnel committed
550

551
552
    template<typename... T>
    constexpr message(T... args) noexcept
Gauthier Quesnel's avatar
Gauthier Quesnel committed
553
    {
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
        if constexpr (are_all_same<i8, T...>()) {
            static_assert(sizeof...(args) <= 32, "i8 message limited to 32");
            using unused = i8[];
            length = 0;
            (void)unused{ i8(0), (integer_8[length++] = args, i8(0))... };
            type = value_type::integer_8;
        } else if constexpr (are_all_same<i32, T...>()) {
            static_assert(sizeof...(args) <= 8, "i32 message limited to 32");
            using unused = i32[];
            length = 0;
            (void)unused{ i32(0), (integer_32[length++] = args, i32(0))... };
            type = value_type::integer_32;
        } else if constexpr (are_all_same<i64, T...>()) {
            static_assert(sizeof...(args) <= 4, "i64 message limited to 32");
            using unused = i64[];
            length = 0;
            (void)unused{ i64(0), (integer_64[length++] = args, i64(0))... };
            type = value_type::integer_64;
        } else if constexpr (are_all_same<float, T...>()) {
            static_assert(sizeof...(args) <= 8, "float message limited to 8");
            using unused = float[];
            length = 0;
            (void)unused{ 0.0f, (real_32[length++] = args, 0.0f)... };
            type = value_type::real_32;
            return;
        } else if constexpr (are_all_same<double, T...>()) {
            static_assert(sizeof...(args) <= 4, "double message limited to 4");
            using unused = double[];
            length = 0;
            (void)unused{ 0.0, (real_64[length++] = args, 0.0)... };
            type = value_type::real_64;
        }
    }
Gauthier Quesnel's avatar
Gauthier Quesnel committed
587

588
589
590
591
    constexpr span<i8, 32> to_integer_8() const
    {
        assert(type == value_type::integer_8);
        return span<i8, 32>(integer_8);
Gauthier Quesnel's avatar
Gauthier Quesnel committed
592
593
    }

594
    constexpr span<i32, 8> to_integer_32() const
Gauthier Quesnel's avatar
Gauthier Quesnel committed
595
    {
596
597
598
        assert(type == value_type::integer_32);
        return span<i32, 8>(integer_32);
    }
Gauthier Quesnel's avatar
Gauthier Quesnel committed
599

600
601
602
603
604
    constexpr span<i64, 4> to_integer_64() const
    {
        assert(type == value_type::integer_64);
        return span<i64, 4>(integer_64);
    }
Gauthier Quesnel's avatar
Gauthier Quesnel committed
605

606
607
608
609
610
    constexpr span<float, 8> to_real_32() const
    {
        assert(type == value_type::real_32);
        return span<float, 8>(real_32);
    }
Gauthier Quesnel's avatar
Gauthier Quesnel committed
611

612
613
614
615
    constexpr span<double, 4> to_real_64() const
    {
        assert(type == value_type::real_64);
        return span<double, 4>(real_64);
Gauthier Quesnel's avatar
Gauthier Quesnel committed
616
617
    }

618
619
    template<typename T>
    constexpr i8 to_integer_8(T i) const
Gauthier Quesnel's avatar
Gauthier Quesnel committed
620
    {
621
        static_assert(std::is_integral_v<T>, "need [unsigned] integer");
Gauthier Quesnel's avatar
Gauthier Quesnel committed
622

623
624
625
626
627
628
629
        if constexpr (std::is_signed_v<T>)
            assert(i >= 0);

        assert(type == value_type::integer_8);
        assert(i < static_cast<T>(length));

        return integer_8[i];
Gauthier Quesnel's avatar
Gauthier Quesnel committed
630
631
    }

632
633
    template<typename T>
    constexpr i32 to_integer_32(T i) const
Gauthier Quesnel's avatar
Gauthier Quesnel committed
634
    {
635
        static_assert(std::is_integral_v<T>, "need [unsigned] integer");
Gauthier Quesnel's avatar
Gauthier Quesnel committed
636

637
638
        if constexpr (std::is_signed_v<T>)
            assert(i >= 0);
Gauthier Quesnel's avatar
Gauthier Quesnel committed
639

640
641
        assert(type == value_type::integer_32);
        assert(i < static_cast<T>(length));
Gauthier Quesnel's avatar
Gauthier Quesnel committed
642

643
644
        return integer_32[i];
    }
Gauthier Quesnel's avatar
Gauthier Quesnel committed
645

646
647
648
649
    template<typename T>
    constexpr i64 to_integer_64(T i) const
    {
        static_assert(std::is_integral_v<T>, "need [unsigned] integer");
Gauthier Quesnel's avatar
Gauthier Quesnel committed
650

651
652
        if constexpr (std::is_signed_v<T>)
            assert(i >= 0);
Gauthier Quesnel's avatar
Gauthier Quesnel committed
653

654
655
656
657
        assert(type == value_type::integer_64);
        assert(i < static_cast<T>(length));

        return integer_64[i];
Gauthier Quesnel's avatar
Gauthier Quesnel committed
658
659
    }

660
661
    template<typename T>
    constexpr float to_real_32(T i) const
Gauthier Quesnel's avatar
Gauthier Quesnel committed
662
    {
663
        static_assert(std::is_integral_v<T>, "need [unsigned] integer");
Gauthier Quesnel's avatar
Gauthier Quesnel committed
664

665
666
        if constexpr (std::is_signed_v<T>)
            assert(i >= 0);
Gauthier Quesnel's avatar
Gauthier Quesnel committed
667

668
669
        assert(type == value_type::real_32);
        assert(i < static_cast<T>(length));
Gauthier Quesnel's avatar
Gauthier Quesnel committed
670

671
672
        return real_32[i];
    }
Gauthier Quesnel's avatar
Gauthier Quesnel committed
673

674
675
676
677
    template<typename T>
    constexpr double to_real_64(T i) const
    {
        static_assert(std::is_integral_v<T>, "need [unsigned] integer");
Gauthier Quesnel's avatar
Gauthier Quesnel committed
678

679
680
        if constexpr (std::is_signed_v<T>)
            assert(i >= 0);
Gauthier Quesnel's avatar
Gauthier Quesnel committed
681

682
683
684
685
        assert(type == value_type::real_64);
        assert(i < static_cast<T>(length));

        return real_64[i];
Gauthier Quesnel's avatar
Gauthier Quesnel committed
686
    }
687
};
Gauthier Quesnel's avatar
Gauthier Quesnel committed
688

689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
/*****************************************************************************
 *
 * Flat list
 *
 ****************************************************************************/

template<typename T>
class block_allocator
{
public:
    static_assert(std::is_trivially_destructible_v<T>,
                  "block_allocator is only for POD object");

    using value_type = T;

    union block
Gauthier Quesnel's avatar
Gauthier Quesnel committed
705
    {
706
707
708
        block* next;
        typename std::aligned_storage<sizeof(T), alignof(T)>::type storage;
    };
Gauthier Quesnel's avatar
Gauthier Quesnel committed
709

710
private:
Gauthier Quesnel's avatar
Gauthier Quesnel committed
711
    block* blocks{ nullptr };    // contains all preallocated blocks
712
713
714
715
    block* free_head{ nullptr }; // a free list
    sz size{ 0 };                // number of active elements allocated
    sz max_size{ 0 }; // number of elements allocated (with free_head)
    sz capacity{ 0 }; // capacity of the allocator
Gauthier Quesnel's avatar
Gauthier Quesnel committed
716

717
718
public:
    block_allocator() = default;
Gauthier Quesnel's avatar
Gauthier Quesnel committed
719

720
721
    block_allocator(const block_allocator&) = delete;
    block_allocator& operator=(const block_allocator&) = delete;
Gauthier Quesnel's avatar
Gauthier Quesnel committed
722

723
724
725
726
    ~block_allocator() noexcept
    {
        if (blocks)
            std::free(blocks);
Gauthier Quesnel's avatar
Gauthier Quesnel committed
727
728
    }

729
    status init(std::size_t new_capacity) noexcept
Gauthier Quesnel's avatar
Gauthier Quesnel committed
730
    {
731
732
        if (new_capacity == 0)
            return status::block_allocator_bad_capacity;
Gauthier Quesnel's avatar
Gauthier Quesnel committed
733

734
735
736
737
738
739
740
741
        if (new_capacity != capacity) {
            if (blocks)
                std::free(blocks);
            blocks =
              static_cast<block*>(std::malloc(new_capacity * sizeof(block)));
            if (blocks == nullptr)
                return status::block_allocator_not_enough_memory;
        }
Gauthier Quesnel's avatar
Gauthier Quesnel committed
742

743
744
745
746
        size = 0;
        max_size = 0;
        capacity = new_capacity;
        free_head = nullptr;
Gauthier Quesnel's avatar
Gauthier Quesnel committed
747

748
        return status::success;
Gauthier Quesnel's avatar
Gauthier Quesnel committed
749
750
    }

751
    void reset() noexcept
Gauthier Quesnel's avatar
Gauthier Quesnel committed
752
    {
753
754
755
756
757
        if (capacity > 0) {
            size = 0;
            max_size = 0;
            free_head = nullptr;
        }
Gauthier Quesnel's avatar
Gauthier Quesnel committed
758
759
    }

760
    std::pair<bool, T*> try_alloc() noexcept
Gauthier Quesnel's avatar
Gauthier Quesnel committed
761
    {
762
763
        if (free_head == nullptr && max_size >= capacity)
            return { false, nullptr };
Gauthier Quesnel's avatar
Gauthier Quesnel committed
764

765
        return { true, alloc() };
Gauthier Quesnel's avatar
Gauthier Quesnel committed
766
767
    }

768
    T* alloc() noexcept
Gauthier Quesnel's avatar
Gauthier Quesnel committed
769
    {
770
771
772
773
774
775
776
777
778
        ++size;
        block* new_block = nullptr;

        if (free_head != nullptr) {
            new_block = free_head;
            free_head = free_head->next;
        } else {
            assert(max_size < capacity);
            new_block = reinterpret_cast<block*>(&blocks[max_size++]);
Gauthier Quesnel's avatar
Gauthier Quesnel committed
779
780
        }

781
        return reinterpret_cast<T*>(new_block);
Gauthier Quesnel's avatar
Gauthier Quesnel committed
782
783
    }

784
    void free(T* n) noexcept
Gauthier Quesnel's avatar
Gauthier Quesnel committed
785
    {
786
        assert(n);
Gauthier Quesnel's avatar
Gauthier Quesnel committed
787

788
        block* ptr = reinterpret_cast<block*>(n);
Gauthier Quesnel's avatar
Gauthier Quesnel committed
789

790
791
        ptr->next = free_head;
        free_head = ptr;
Gauthier Quesnel's avatar
Gauthier Quesnel committed
792

793
        --size;
Gauthier Quesnel's avatar
Gauthier Quesnel committed
794

795
796
797
798
        if (size == 0) {         // A special part: if it no longer exists
            max_size = 0;        // we reset the free list and the number
            free_head = nullptr; // of elements allocated.
        }
Gauthier Quesnel's avatar
Gauthier Quesnel committed
799
    }
800
};
Gauthier Quesnel's avatar
Gauthier Quesnel committed
801

802
803
804
805
806
template<typename T>
class flat_list
{
public:
    struct node_type
Gauthier Quesnel's avatar
Gauthier Quesnel committed
807
    {
808
809
810
        T value;
        node_type* next = nullptr;
    };
Gauthier Quesnel's avatar
Gauthier Quesnel committed
811

812
813
814
815
public:
    using allocator_type = block_allocator<node_type>;
    using value_type = T;
    using reference = T&;
816
    using const_reference = const T&;
817
    using pointer = T*;
Gauthier Quesnel's avatar
Gauthier Quesnel committed
818

819
    class iterator
Gauthier Quesnel's avatar
Gauthier Quesnel committed
820
    {
821
822
    private:
        node_type* node{ nullptr };
Gauthier Quesnel's avatar
Gauthier Quesnel committed
823

824
825
826
827
828
829
    public:
        using iterator_category = std::forward_iterator_tag;
        using value_type = T;
        using pointer = T*;
        using reference = T&;
        using difference_type = std::ptrdiff_t;
Gauthier Quesnel's avatar
Gauthier Quesnel committed
830

831
        iterator() noexcept = default;
Gauthier Quesnel's avatar
Gauthier Quesnel committed
832

833
834
835
        iterator(node_type* n) noexcept
          : node(n)
        {}
Gauthier Quesnel's avatar
Gauthier Quesnel committed
836

837
838
839
        iterator(const iterator& other) noexcept
          : node(other.node)
        {}
Gauthier Quesnel's avatar
Gauthier Quesnel committed
840

841
842
843
844
845
        iterator& operator=(const iterator& other) noexcept
        {
            node = other.node;
            return *this;
        }
Gauthier Quesnel's avatar
Gauthier Quesnel committed
846

847
848
849
850
        T& operator*() noexcept
        {
            return node->value;
        }
Gauthier Quesnel's avatar
Gauthier Quesnel committed
851

852
853
854
855
        T* operator->() noexcept
        {
            return &node->value;
        }
Gauthier Quesnel's avatar
Gauthier Quesnel committed
856

857
858
859
860
        iterator operator++() noexcept
        {
            if (node != nullptr)
                node = node->next;
Gauthier Quesnel's avatar
Gauthier Quesnel committed
861

862
863
            return *this;
        }
Gauthier Quesnel's avatar
Gauthier Quesnel committed
864

865
866
867
        iterator operator++(int) noexcept
        {
            iterator tmp(*this);
Gauthier Quesnel's avatar
Gauthier Quesnel committed
868

869
870
            if (node != nullptr)
                node = node->next;
Gauthier Quesnel's avatar
Gauthier Quesnel committed
871

872
873
            return tmp;
        }
Gauthier Quesnel's avatar
Gauthier Quesnel committed
874

875
876
877
878
        bool operator==(const iterator& other) const noexcept
        {
            return node == other.node;
        }
Gauthier Quesnel's avatar
Gauthier Quesnel committed
879

880
881
882
883
        bool operator!=(const iterator& other) const noexcept
        {
            return node != other.node;
        }
Gauthier Quesnel's avatar
Gauthier Quesnel committed
884

885
886
887
888
        void swap(iterator& other) noexcept
        {
            std::swap(node, other.node);
        }
889

Gauthier Quesnel's avatar
Gauthier Quesnel committed
890
        friend class flat_list<T>;
891
    };
Gauthier Quesnel's avatar
Gauthier Quesnel committed
892

893
    class const_iterator
Gauthier Quesnel's avatar
Gauthier Quesnel committed
894
    {
895
896
    private:
        const node_type* node{ nullptr };
Gauthier Quesnel's avatar
Gauthier Quesnel committed
897

898
899
900
901
902
903
    public:
        using iterator_category = std::forward_iterator_tag;
        using value_type = T;
        using pointer = T*;
        using reference = T&;
        using difference_type = std::ptrdiff_t;
Gauthier Quesnel's avatar
Gauthier Quesnel committed
904

905
        const_iterator() noexcept = default;
Gauthier Quesnel's avatar
Gauthier Quesnel committed
906

907
908
909
        const_iterator(node_type* n) noexcept
          : node(n)
        {}
Gauthier Quesnel's avatar
Gauthier Quesnel committed
910

911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
        const_iterator(const const_iterator& other) noexcept
          : node(other.node)
        {}

        const_iterator& operator=(const const_iterator& other) noexcept
        {
            node = other.node;
            return *this;
        }

        const T& operator*() noexcept
        {
            return node->value;
        }

        const T* operator->() noexcept
        {
            return &node->value;
        }

        const_iterator operator++() noexcept
        {
            if (node != nullptr)
                node = node->next;

            return *this;
        }

        const_iterator operator++(int) noexcept
        {
            const_iterator tmp(*this);

            if (node != nullptr)
                node = node->next;

            return tmp;
        }

        bool operator==(const const_iterator& other) const noexcept
        {
            return node == other.node;
        }

        bool operator!=(const const_iterator& other) const noexcept
        {
            return node != other.node;
        }

        void swap(const_iterator& other) noexcept
        {
            std::swap(node, other.node);
        }
963

Gauthier Quesnel's avatar
Gauthier Quesnel committed
964
        friend class flat_list<T>;
Gauthier Quesnel's avatar
Gauthier Quesnel committed
965
966
    };

967
968
969
private:
    allocator_type* allocator{ nullptr };
    node_type* node{ nullptr };
Gauthier Quesnel's avatar
Gauthier Quesnel committed
970

971
972
public:
    flat_list() = default;
Gauthier Quesnel's avatar
Gauthier Quesnel committed
973

974
975
    flat_list(allocator_type* allocator_new) noexcept
      : allocator(allocator_new)
Gauthier Quesnel's avatar
Gauthier Quesnel committed
976
977
    {}

978
979
980
981
982
983
    flat_list(const flat_list& other) = delete;
    flat_list& operator=(const flat_list& other) = delete;

    flat_list(flat_list&& other) noexcept
      : allocator(other.allocator)
      , node(other.node)
Gauthier Quesnel's avatar
Gauthier Quesnel committed
984
    {
985
986
        other.allocator = nullptr;
        other.node = nullptr;
Gauthier Quesnel's avatar
Gauthier Quesnel committed
987
988
    }

989
    void set_allocator(allocator_type* allocator_new) noexcept
Gauthier Quesnel's avatar
Gauthier Quesnel committed
990
    {
991
992
993
        clear();
        allocator = allocator_new;
        node = nullptr;
Gauthier Quesnel's avatar
Gauthier Quesnel committed
994
995
    }

996
    flat_list& operator=(flat_list&& other) noexcept
Gauthier Quesnel's avatar
Gauthier Quesnel committed
997
    {
998
999
1000
1001
1002
1003
1004
1005
1006
        if (this != &other) {
            clear();
            allocator = other.allocator;
            other.allocator = nullptr;
            node = other.node;
            other.node = nullptr;
        }

        return *this;
Gauthier Quesnel's avatar
Gauthier Quesnel committed
1007
1008
    }

1009
    ~flat_list() noexcept
Gauthier Quesnel's avatar
Gauthier Quesnel committed
1010
    {
1011
        clear();
Gauthier Quesnel's avatar
Gauthier Quesnel committed
1012
1013
    }

1014
    void clear() noexcept
Gauthier Quesnel's avatar
Gauthier Quesnel committed
1015
    {
1016
1017
1018
1019
1020
1021
1022
        node_type* prev = node;

        while (node != nullptr) {
            node = node->next;
            allocator->free(prev);
            prev = node;
        }
Gauthier Quesnel's avatar
Gauthier Quesnel committed
1023
1024
    }

1025
    bool empty() const noexcept
Gauthier Quesnel's avatar
Gauthier Quesnel committed
1026
    {
1027
        return node == nullptr;
Gauthier Quesnel's avatar
Gauthier Quesnel committed
1028
1029
    }

1030
    iterator begin() noexcept
Gauthier Quesnel's avatar
Gauthier Quesnel committed
1031
    {
1032
1033
        return iterator(node);
    }
Gauthier Quesnel's avatar
Gauthier Quesnel committed
1034

1035
1036
1037
1038
    iterator end() noexcept
    {
        return iterator(nullptr);
    }
Gauthier Quesnel's avatar
Gauthier Quesnel committed
1039

1040
1041
1042
1043
    const_iterator begin() const noexcept
    {
        return const_iterator(node);
    }
Gauthier Quesnel's avatar
Gauthier Quesnel committed
1044

1045
1046
1047
    const_iterator end() const noexcept
    {
        return const_iterator(nullptr);
Gauthier Quesnel's avatar
Gauthier Quesnel committed
1048
1049
    }

1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
    reference front() noexcept
    {
        assert(!empty());

        return node->value;
    }

    const_reference front() const noexcept
    {
        assert(!empty());

        return node->value;
    }

1064
1065
    template<typename... Args>
    iterator emplace_front(Args&&... args) noexcept
Gauthier Quesnel's avatar
Gauthier Quesnel committed
1066
    {
1067
        node_type* new_node = allocator->alloc();
Gauthier Quesnel's avatar
Gauthier Quesnel committed
1068

1069
        new (&new_node->value) T(std::forward<Args>(args)...);
Gauthier Quesnel's avatar
Gauthier Quesnel committed
1070

1071
1072
        new_node->next = node;
        node = new_node;
Gauthier Quesnel's avatar
Gauthier Quesnel committed
1073

1074
        return begin();
Gauthier Quesnel's avatar
Gauthier Quesnel committed
1075
1076
    }

1077
1078
    template<typename... Args>
    iterator emplace_after(iterator it, Args&&... args) noexcept
Gauthier Quesnel's avatar
Gauthier Quesnel committed
1079
    {
1080
1081
        node_type* new_node = allocator->alloc();
        new (&new_node->value) T(std::forward<Args>(args)...);
Gauthier Quesnel's avatar
Gauthier Quesnel committed
1082

1083
1084
        if (it->node == nullptr)
            return emplace_front(std::forward<Args>(args)...);
Gauthier Quesnel's avatar
Gauthier Quesnel committed
1085

1086
1087
        new_node->next = it->node->next;
        it->node->next = new_node;
Gauthier Quesnel's avatar
Gauthier Quesnel committed
1088

1089
        return iterator(new_node);
Gauthier Quesnel's avatar
Gauthier Quesnel committed
1090
1091
    }

1092
1093
    template<typename... Args>
    iterator try_emplace_front(Args&&... args) noexcept
Gauthier Quesnel's avatar
Gauthier Quesnel committed
1094
    {
1095
        auto [success, new_node] = allocator->try_alloc();
Gauthier Quesnel's avatar
Gauthier Quesnel committed
1096

1097
1098
        if (!success)
            return end();
Gauthier Quesnel's avatar
Gauthier Quesnel committed
1099

1100
        new (&new_node->value) T(std::forward<Args>(args)...);
Gauthier Quesnel's avatar
Gauthier Quesnel committed
1101

1102
1103
1104
1105
        new_node->next = node;
        node = new_node;

        return begin();
Gauthier Quesnel's avatar
Gauthier Quesnel committed
1106
1107
    }

1108
1109
    template<typename... Args>
    iterator try_emplace_after(iterator it, Args&&... args) noexcept
Gauthier Quesnel's avatar
Gauthier Quesnel committed
1110
    {
1111
        auto [success, new_node] = allocator->try_alloc();
Gauthier Quesnel's avatar
Gauthier Quesnel committed
1112

1113
1114
        if (!success)
            return end();
Gauthier Quesnel's avatar
Gauthier Quesnel committed
1115

1116
        new (&new_node->value) T(std::forward<Args>(args)...);
Gauthier Quesnel's avatar
Gauthier Quesnel committed
1117

1118
1119
        if (it->node == nullptr)
            return emplace_front(std::forward<Args>(args)...);
Gauthier Quesnel's avatar
Gauthier Quesnel committed
1120

1121
1122
        new_node->next = it->node->next;
        it->node->next = new_node;
Gauthier Quesnel's avatar
Gauthier Quesnel committed
1123

1124
        return iterator(new_node);
Gauthier Quesnel's avatar
Gauthier Quesnel committed
1125
1126
    }

1127
    void pop_front() noexcept
Gauthier Quesnel's avatar
Gauthier Quesnel committed
1128
    {
1129
1130
        if (node == nullptr)
            return;
Gauthier Quesnel's avatar
Gauthier Quesnel committed
1131

1132
1133
        node_type* to_delete = node;
        node = node->next;
Gauthier Quesnel's avatar
Gauthier Quesnel committed
1134

1135
        if constexpr (!std::is_trivial_v<T>)
1136
            to_delete->value.~T();
Gauthier Quesnel's avatar
Gauthier Quesnel committed
1137

1138
        allocator->free(to_delete);
Gauthier Quesnel's avatar
Gauthier Quesnel committed
1139
1140
    }

1141
    iterator erase_after(iterator it) noexcept
Gauthier Quesnel's avatar
Gauthier Quesnel committed
1142
    {
1143
        assert(allocator);
Gauthier Quesnel's avatar
Gauthier Quesnel committed
1144

1145
1146
        if (it.node == nullptr)
            return end();
Gauthier Quesnel's avatar
Gauthier Quesnel committed
1147

1148
1149
1150
        node_type* to_delete = it.node->next;
        if (to_delete == nullptr)
            return end();
Gauthier Quesnel's avatar
Gauthier Quesnel committed
1151

1152
1153
        node_type* next = to_delete->next;
        it.node->next = next;
Gauthier Quesnel's avatar
Gauthier Quesnel committed
1154

1155
        if constexpr (!std::is_trivial_v<T>)
1156
            to_delete->value.~T();
Gauthier Quesnel's avatar
Gauthier Quesnel committed
1157

1158
        allocator->free(to_delete);
Gauthier Quesnel's avatar
Gauthier Quesnel committed
1159

1160
        return iterator(next);
Gauthier Quesnel's avatar
Gauthier Quesnel committed
1161
1162
1163
1164
    }
};

template<typename T>
1165
class flat_double_list
Gauthier Quesnel's avatar
Gauthier Quesnel committed
1166
{
1167
private:
Gauthier Quesnel's avatar
Gauthier Quesnel committed
1168
1169
1170
1171
    struct node_type
    {
        T value;
        node_type* next = nullptr;
1172
        node_type* prev = nullptr;
Gauthier Quesnel's avatar
Gauthier Quesnel committed
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
    };

public:
    using allocator_type = block_allocator<node_type>;
    using value_type = T;
    using reference = T&;
    using pointer = T*;

    class iterator
    {
    private:
1184
        flat_double_list* list{ nullptr };
Gauthier Quesnel's avatar
Gauthier Quesnel committed
1185
1186
1187
        node_type* node{ nullptr };

    public:
1188
        using iterator_category = std::bidirectional_iterator_tag;
Gauthier Quesnel's avatar
Gauthier Quesnel committed
1189
1190
1191
1192
1193
1194
        using value_type = T;
        using pointer = T*;
        using reference = T&;

        iterator() noexcept = default;

1195
1196
1197
        iterator(flat_double_list* lst, node_type* n) noexcept
          : list(lst)
          , node(n)
Gauthier Quesnel's avatar
Gauthier Quesnel committed
1198
1199
1200
        {}

        iterator(const iterator& other) noexcept
1201
1202
          : list(other.list)
          , node(other.node)
Gauthier Quesnel's avatar
Gauthier Quesnel committed
1203
1204
1205
1206
        {}

        iterator& operator=(const iterator& other) noexcept
        {
1207
            list = other.list;
Gauthier Quesnel's avatar
Gauthier Quesnel committed
1208
1209
1210
1211
1212
1213
1214
1215
1216
            node = other.node;
            return *this;
        }

        T& operator*() noexcept
        {
            return node->value;
        }

1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
        T* operator*() const noexcept
        {
            return node->value;
        }

        pointer operator->() noexcept
        {
            return &(node->value);
        }

        pointer operator->() const noexcept
Gauthier Quesnel's avatar
Gauthier Quesnel committed
1228
1229
1230
1231
1232
1233
        {
            return &node->value;
        }

        iterator operator++() noexcept
        {
1234
            node = (node == nullptr) ? list->m_front : node->next;
Gauthier Quesnel's avatar
Gauthier Quesnel committed
1235
1236
1237
1238
1239
1240
1241
1242

            return *this;
        }

        iterator operator++(int) noexcept
        {
            iterator tmp(*this);

1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
            node = (node == nullptr) ? list->m_front : node->next;

            return tmp;
        }

        iterator operator--() noexcept
        {
            node = (node == nullptr) ? list->m_back : node->prev;

            return *this;
        }

        iterator operator--(int) noexcept
        {
            iterator tmp(*this);

            node = (node == nullptr) ? list->m_back : node->prev;
Gauthier Quesnel's avatar
Gauthier Quesnel committed
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275

            return tmp;
        }

        bool operator==(const iterator& other) const noexcept
        {
            return node == other.node;
        }

        bool operator!=(const iterator& other) const noexcept
        {
            return node != other.node;
        }

        void swap(iterator& other) noexcept
        {
1276
            std::swap(list, other.list);
Gauthier Quesnel's avatar
Gauthier Quesnel committed
1277
1278
1279
1280
1281
1282
1283
            std::swap(node, other.node);
        }
    };

    class const_iterator
    {
    private:
1284
1285
        const flat_double_list* list{ nullptr };
        node_type* node{ nullptr };
Gauthier Quesnel's avatar
Gauthier Quesnel committed
1286
1287

    public:
1288
        using const_iterator_category = std::bidirectional_iterator_tag;
Gauthier Quesnel's avatar
Gauthier Quesnel committed
1289
1290
1291
1292
1293
1294
        using value_type = T;
        using pointer = T*;
        using reference = T&;

        const_iterator() noexcept = default;

1295
1296
1297
        const_iterator(const flat_double_list* lst, node_type* n) noexcept
          : list(lst)
          , node(n)
Gauthier Quesnel's avatar
Gauthier Quesnel committed
1298
1299
1300
        {}

        const_iterator(const const_iterator& other) noexcept
1301
1302
          : list(other.list)
          , node(other.node)
Gauthier Quesnel's avatar
Gauthier Quesnel committed
1303
1304
1305
1306
        {}

        const_iterator& operator=(const const_iterator& other) noexcept
        {
1307
            list = other.list;
Gauthier Quesnel's avatar
Gauthier Quesnel committed
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
            node = other.node;
            return *this;
        }

        const T& operator*() noexcept
        {
            return node->value;
        }

        const T* operator->() noexcept
        {
1319
            return &(node->value);
Gauthier Quesnel's avatar
Gauthier Quesnel committed
1320
1321
1322
1323
        }

        const_iterator operator++() noexcept
        {
1324
            node = (node == nullptr) ? list->m_front : node->next;
<