15477382360

Committed 05 Jun 2025 09:11PM UTC coverage: 52.992% (+0.2%) from 52.785%

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Pull #16

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web-flow

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Merge 04ac760e6 into a32e9aeba

Pull Request Pull Request #16: Small buffer optimization

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/test/src/test-iterator_adapter.cpp

// ============================= TRANSFORM  TESTS =============================== //
// Project:         The Experimental Bit Algorithms Library
// Description:     Tests for transform algorithms
// Contributor(s):  Bryce Kille
// License:         BSD 3-Clause License
// ========================================================================== //


// ============================== PREAMBLE ================================== //
// C++ standard library
#include <math.h>
#include <algorithm>
#include <functional>
// Project sources
#include "bitlib/bit-algorithms/bit_algorithm.hpp"
#include "bitlib/bit-containers/bit-containers.hpp"
#include "fixtures.hpp"
// Third-party libraries
#include "gtest/gtest.h"
// Miscellaneous
// ========================================================================== //
#include "bitlib/bit-iterator/bit_word_pointer_adapter.hpp"

//
// GoogleTest suite for bit::bit_word_pointer_adapter.
// Covers both “big‐to‐small” and “small‐to‐large” modes.
//

// Assumes a little‐endian platform (so that reinterpret_cast<…> of bytes
// within larger words behaves predictably). If you compile on a big‐endian
// machine, these tests will fail.
//
// Verify that we are on a little‐endian machine:
static_assert(std::endian::native == std::endian::little,
              "These tests assume little‐endian byte order");

TEST(IteratorAdapter, Basic) {
    std::vector<uint16_t> base{0x1234, 0x2345, 0x3456, 0x4567};
    bit::bit_word_pointer_adapter<uint8_t*, std::vector<uint16_t>::iterator> adapter(base.begin());
    EXPECT_EQ(*adapter, 0x34);
    EXPECT_EQ(*(++adapter), 0x12);
    EXPECT_EQ(*(adapter++), 0x12);
    EXPECT_EQ(*adapter, 0x45);
    adapter += 2;
    EXPECT_EQ(*adapter, 0x56);
}

// -----------------------------------------------------------------------------
// Helper: Convert a 32‐bit word into its 4 individual bytes (little‐endian)
// -----------------------------------------------------------------------------
static void split_u32_le(uint32_t value, uint8_t out_bytes[4]) {
  out_bytes[0] = static_cast<uint8_t>(value & 0xFFu);
  out_bytes[1] = static_cast<uint8_t>((value >> 8) & 0xFFu);
  out_bytes[2] = static_cast<uint8_t>((value >> 16) & 0xFFu);
  out_bytes[3] = static_cast<uint8_t>((value >> 24) & 0xFFu);
}

// -----------------------------------------------------------------------------
// TEST SUITE: Big-to-Small Mode (BaseIterator.value_type > Iterator.value_type)
// -----------------------------------------------------------------------------
TEST(BitIteratorAdapter_BigToSmall, DereferenceAndIncrement) {
  // Base‐words are 32-bit => 4 × 8-bit subwords
  constexpr size_t N = 2;
  uint32_t base_arr[N] = {0x04030201u, 0x08070605u};
  // Bytes in memory (little‐endian):
  // base_arr[0]: {0x01,0x02,0x03,0x04}
  // base_arr[1]: {0x05,0x06,0x07,0x08}

  // Iterator type: iterate in 8-bit steps over a 32-bit array
  using Iter8 = uint8_t*;
  using Base32 = uint32_t*;
  using Adapter8_32 = bit::bit_word_pointer_adapter<Iter8, Base32>;

  Adapter8_32 it(base_arr, /*pos=*/0);

  // Check that *it sees the first byte = 0x01
  EXPECT_EQ(*it, 0x01u);

  // Advance 1: pos=1, still in base_arr[0]
  ++it;
  EXPECT_EQ(it.index(), 1u);
  EXPECT_EQ(*it, 0x02u);

  // Advance to pos=3
  it += 2;
  EXPECT_EQ(it.index(), 3u);
  EXPECT_EQ(*it, 0x04u);

  // Next increment should roll over to base_arr[1], pos=0
  ++it;
  EXPECT_EQ(it.base(), base_arr + 1);
  EXPECT_EQ(it.index(), 0u);
  EXPECT_EQ(*it, 0x05u);

  // Further increments
  ++it;  // pos=1
  EXPECT_EQ(it.index(), 1u);
  EXPECT_EQ(*it, 0x06u);

  ++it;  // pos=2
  EXPECT_EQ(it.index(), 2u);
  EXPECT_EQ(*it, 0x07u);

  ++it;  // pos=3
  EXPECT_EQ(it.index(), 3u);
  EXPECT_EQ(*it, 0x08u);
}

TEST(BitIteratorAdapter_BigToSmall, OperatorStarAndArrow) {
  // Use a single base word = 0xAABBCCDD
  uint32_t base_val = 0xAABBCCDDu;
  // Memory bytes: { DD, CC, BB, AA } little-endian
  using Iter8 = uint8_t*;
  using Base32 = uint32_t*;
  using Adapter8_32 = bit::bit_word_pointer_adapter<Iter8, Base32>;

  Adapter8_32 it(&base_val, /*pos=*/0);

  EXPECT_EQ(*it, 0xDDu);
  // operator->() should return a pointer to the byte
  auto p = *it;
  EXPECT_EQ(p, 0xDDu);

  // Move to pos=2
  it += 2;
  EXPECT_EQ(*it, 0xBBu);
  EXPECT_EQ(it.index(), 2u);

  // operator->() at pos=2
  p = *it;
  EXPECT_EQ(p, 0xBBu);
}

TEST(BitIteratorAdapter_BigToSmall, OperatorPlusMinusAndDistance) {
  // Fill two 32-bit words
  uint32_t base_arr[2] = {0x11223344u, 0x55667788u};
  // Bytes: {44,33,22,11,  88,77,66,55}

  using Iter8 = uint8_t*;
  using Base32 = uint32_t*;
  using Adapter8_32 = bit::bit_word_pointer_adapter<Iter8, Base32>;

  Adapter8_32 it(base_arr, /*pos=*/0);  // points at first byte (0x44)

  // it + 3 => should point to 4th byte of base_arr[0] = 0x11
  auto it3 = it + 3;
  EXPECT_EQ(it3.base(), base_arr);
  EXPECT_EQ(it3.index(), 3u);
  EXPECT_EQ(*it3, 0x11u);

  // it + 4 => moves into base_arr[1], pos=0 => should be 0x88
  auto it4 = it + 4;
  EXPECT_EQ(it4.base(), base_arr + 1);
  EXPECT_EQ(it4.index(), 0u);
  EXPECT_EQ(*it4, 0x88u);

  // Now distance between it and it+7 = 7
  auto it7 = it + 7;
  EXPECT_EQ(it7.base(), base_arr + 1);
  EXPECT_EQ(it7.index(), 3u);
  EXPECT_EQ(*it7, 0x55u);

  EXPECT_EQ(it7 - it, 7);
  EXPECT_EQ(it - it, 0);

  // Test operator- (iterator difference) with reversed operands
  EXPECT_EQ((it - it7), -7);

  // Advance it4 by -2 => (it4 - 2) = it + 2 => base_arr[0], pos=2 => 0x22
  auto it2 = it4 - 2;
  EXPECT_EQ(it2.base(), base_arr);
  EXPECT_EQ(it2.index(), 2u);
  EXPECT_EQ(*it2, 0x22u);
}

TEST(BitIteratorAdapter_BigToSmall, OperatorSubscript) {
  // 1 uint32_t: 0xDEADBEEFu => bytes { EF, BE, AD, DE }
  uint32_t base_val = 0xDEADBEEFu;
  using Iter8 = uint8_t*;
  using Base32 = uint32_t*;
  using Adapter8_32 = bit::bit_word_pointer_adapter<Iter8, Base32>;

  Adapter8_32 it(&base_val, /*pos=*/0);
  // it[0] == 0xEF, it[1] == 0xBE, it[2] == 0xAD, it[3] == 0xDE
  EXPECT_EQ(it[0], static_cast<uint8_t>(0xEFu));
  EXPECT_EQ(it[1], static_cast<uint8_t>(0xBEu));
  EXPECT_EQ(it[2], static_cast<uint8_t>(0xADu));
  EXPECT_EQ(it[3], static_cast<uint8_t>(0xDEu));

  // Negative index: it[ -1 ] => moves to previous base word;
  // but since there's no previous word, behavior is UB. We skip testing negative here.

  // If we do it + 4, then subscript( it + 4 )[0] should be same as it[4]
  auto it_shift = it + 4;  // rolls into next base (out-of-bounds, but for test allocate two words)
  // For safety, create two‐element array:
  uint32_t arr2[2] = {0x01020304u, 0x05060708u};
  Adapter8_32 it2(arr2, 0);
  EXPECT_EQ(it2[0], 0x04u);
  EXPECT_EQ(it2[1], 0x03u);
  EXPECT_EQ(it2[2], 0x02u);
  EXPECT_EQ(it2[3], 0x01u);
  EXPECT_EQ(it2[4], 0x08u);
  EXPECT_EQ(it2[5], 0x07u);
  EXPECT_EQ(it2[6], 0x06u);
  EXPECT_EQ(it2[7], 0x05u);
}

// -----------------------------------------------------------------------------
// TEST SUITE: Small-to-Large Mode (BaseIterator.value_type < Iterator.value_type)
// -----------------------------------------------------------------------------
TEST(BitIteratorAdapter_SmallToLarge, DereferenceAndIncrement) {
  // Base: array of uint8_t; Iterator’s value_type = uint16_t => ratio = 2
  uint8_t base_arr[] = {
      0x11, 0x22,  // first 16-bit chunk => 0x2211
      0x33, 0x44,  // second 16-bit chunk => 0x4433
      0x55, 0x66   // third 16-bit chunk => 0x6655
  };
  using Iter16 = uint16_t*;
  using Base8 = uint8_t*;
  using Adapter16_8 = bit::bit_word_pointer_adapter<Iter16, Base8>;

  Adapter16_8 it(base_arr);

  // *it: combine base[0] + (base[1] << 8) => 0x2211
  uint16_t first = *it;
  EXPECT_EQ(first, static_cast<uint16_t>(0x2211u));

  // ++it => skip 2 bytes: now base points to base_arr+2
  ++it;
  uint16_t second = *it;
  EXPECT_EQ(second, static_cast<uint16_t>(0x4433u));

  // ++it again
  ++it;
  uint16_t third = *it;
  EXPECT_EQ(third, static_cast<uint16_t>(0x6655u));
}

TEST(BitIteratorAdapter_SmallToLarge, OperatorPlusMinusDistance) {
  // Base: eight uint8_t => four uint16_t logical elements
  uint8_t base_arr[8] = {
      0x10, 0x01,  // 0x0110
      0x20, 0x02,  // 0x0220
      0x30, 0x03,  // 0x0330
      0x40, 0x04   // 0x0440
  };
  using Iter16 = uint16_t*;
  using Base8 = uint8_t*;
  using Adapter16_8 = bit::bit_word_pointer_adapter<Iter16, Base8>;

  Adapter16_8 it(base_arr);

  // it + 0 => *it == 0x0110
  EXPECT_EQ(*it, static_cast<uint16_t>(0x0110u));

  // it + 1 => combine bytes at indices [2,3] => 0x0220
  auto it1 = it + 1;
  EXPECT_EQ(*it1, static_cast<uint16_t>(0x0220u));

  // it + 2 => 0x0330
  auto it2 = it + 2;
  EXPECT_EQ(*it2, static_cast<uint16_t>(0x0330u));

  // it + 3 => 0x0440
  auto it3 = it + 3;
  EXPECT_EQ(*it3, static_cast<uint16_t>(0x0440u));

  // Distance: it3 - it == 3
  EXPECT_EQ(it3 - it, 3);
  EXPECT_EQ(it - it, 0);

  // it2 - it1 == 1
  EXPECT_EQ(it2 - it1, 1);

  // Subtraction reversed:
  EXPECT_EQ(it - it3, -3);
}

TEST(BitIteratorAdapter_SmallToLarge, OperatorStarAndArrow) {
  uint8_t base_arr[4] = {0xAA, 0xBB, 0xCC, 0xDD};
  using Iter16 = uint16_t*;
  using Base8 = uint8_t*;
  using Adapter16_8 = bit::bit_word_pointer_adapter<Iter16, Base8>;

  Adapter16_8 it(base_arr);
  // *it => (0xBB << 8) | 0xAA = 0xBBAA
  EXPECT_EQ(*it, static_cast<uint16_t>(0xBBAAu));
}

TEST(BitIteratorAdapter_SmallToLarge, OperatorPlusEqualsAndMinusEquals) {
  // Base: six uint8_t => three 16-bit words
  uint8_t base_arr[6] = {
      0x01, 0xA0,  // 0xA001
      0x02, 0xB0,  // 0xB002
      0x03, 0xC0   // 0xC003
  };
  using Iter16 = uint16_t*;
  using Base8 = uint8_t*;
  using Adapter16_8 = bit::bit_word_pointer_adapter<Iter16, Base8>;

  Adapter16_8 it(base_arr);

  // it += 1 => now at second 16-bit chunk: 0xB002
  it += 1;
  EXPECT_EQ(*it, static_cast<uint16_t>(0xB002u));

  // it += 1 => now at third: 0xC003
  it += 1;
  EXPECT_EQ(*it, static_cast<uint16_t>(0xC003u));

  // it -= 2 => go back to first chunk: 0xA001
  it -= 2;
  EXPECT_EQ(*it, static_cast<uint16_t>(0xA001u));
}

TEST(BitIteratorAdapter_SmallToLarge, OperatorMinusBetweenDifferentIterators) {
  // Base: eight uint8_t => four 16-bit words
  uint8_t base_arr[8] = {
      0x01, 0x10,  // 0x1001
      0x02, 0x20,  // 0x2002
      0x03, 0x30,  // 0x3003
      0x04, 0x40   // 0x4004
  };
  using Iter16 = uint16_t*;
  using Base8 = uint8_t*;
  using Adapter16_8 = bit::bit_word_pointer_adapter<Iter16, Base8>;

  Adapter16_8 it0(base_arr);
  Adapter16_8 it2(base_arr + 4);  // same as (it0 + 2)

  EXPECT_EQ(it2 - it0, 2);
  EXPECT_EQ(it0 - it2, -2);
}

1	// ============================= TRANSFORM TESTS =============================== //
2	// Project: The Experimental Bit Algorithms Library
3	// Description: Tests for transform algorithms
4	// Contributor(s): Bryce Kille
5	// License: BSD 3-Clause License
6	// ========================================================================== //
7
8
9	// ============================== PREAMBLE ================================== //
10	// C++ standard library
11	#include <math.h>
12	#include <algorithm>
13	#include <functional>
14	// Project sources
15	#include "bitlib/bit-algorithms/bit_algorithm.hpp"
16	#include "bitlib/bit-containers/bit-containers.hpp"
17	#include "fixtures.hpp"
18	// Third-party libraries
19	#include "gtest/gtest.h"
20	// Miscellaneous
21	// ========================================================================== //
22	#include "bitlib/bit-iterator/bit_word_pointer_adapter.hpp"
23
24	//
25	// GoogleTest suite for bit::bit_word_pointer_adapter.
26	// Covers both “big‐to‐small” and “small‐to‐large” modes.
27	//
28
29	// Assumes a little‐endian platform (so that reinterpret_cast<…> of bytes
30	// within larger words behaves predictably). If you compile on a big‐endian
31	// machine, these tests will fail.
32	//
33	// Verify that we are on a little‐endian machine:
34	static_assert(std::endian::native == std::endian::little,
35	"These tests assume little‐endian byte order");
36
37	TEST(IteratorAdapter, Basic) {	1✔
38	std::vector<uint16_t> base{0x1234, 0x2345, 0x3456, 0x4567};	1✔
39	bit::bit_word_pointer_adapter<uint8_t*, std::vector<uint16_t>::iterator> adapter(base.begin());	1✔
40	EXPECT_EQ(*adapter, 0x34);	1!
41	EXPECT_EQ(*(++adapter), 0x12);	1!
42	EXPECT_EQ(*(adapter++), 0x12);	1!
43	EXPECT_EQ(*adapter, 0x45);	1!
44	adapter += 2;	1✔
45	EXPECT_EQ(*adapter, 0x56);	1!
46	}	1✔
47
48	// -----------------------------------------------------------------------------
49	// Helper: Convert a 32‐bit word into its 4 individual bytes (little‐endian)
50	// -----------------------------------------------------------------------------
NEW 51	static void split_u32_le(uint32_t value, uint8_t out_bytes[4]) {	×
NEW 52	out_bytes[0] = static_cast<uint8_t>(value & 0xFFu);	×
NEW 53	out_bytes[1] = static_cast<uint8_t>((value >> 8) & 0xFFu);	×
NEW 54	out_bytes[2] = static_cast<uint8_t>((value >> 16) & 0xFFu);	×
NEW 55	out_bytes[3] = static_cast<uint8_t>((value >> 24) & 0xFFu);	×
NEW 56	}	×
57
58	// -----------------------------------------------------------------------------
59	// TEST SUITE: Big-to-Small Mode (BaseIterator.value_type > Iterator.value_type)
60	// -----------------------------------------------------------------------------
61	TEST(BitIteratorAdapter_BigToSmall, DereferenceAndIncrement) {	1✔
62	// Base‐words are 32-bit => 4 × 8-bit subwords
63	constexpr size_t N = 2;	1✔
64	uint32_t base_arr[N] = {0x04030201u, 0x08070605u};	1✔
65	// Bytes in memory (little‐endian):
66	// base_arr[0]: {0x01,0x02,0x03,0x04}
67	// base_arr[1]: {0x05,0x06,0x07,0x08}
68
69	// Iterator type: iterate in 8-bit steps over a 32-bit array
70	using Iter8 = uint8_t*;	1✔
71	using Base32 = uint32_t*;	1✔
72	using Adapter8_32 = bit::bit_word_pointer_adapter<Iter8, Base32>;	1✔
73
74	Adapter8_32 it(base_arr, /pos=/0);	1✔
75
76	// Check that *it sees the first byte = 0x01
77	EXPECT_EQ(*it, 0x01u);	1!
78
79	// Advance 1: pos=1, still in base_arr[0]
80	++it;	1✔
81	EXPECT_EQ(it.index(), 1u);	1!
82	EXPECT_EQ(*it, 0x02u);	1!
83
84	// Advance to pos=3
85	it += 2;	1✔
86	EXPECT_EQ(it.index(), 3u);	1!
87	EXPECT_EQ(*it, 0x04u);	1!
88
89	// Next increment should roll over to base_arr[1], pos=0
90	++it;	1✔
91	EXPECT_EQ(it.base(), base_arr + 1);	1!
92	EXPECT_EQ(it.index(), 0u);	1!
93	EXPECT_EQ(*it, 0x05u);	1!
94
95	// Further increments
96	++it; // pos=1	1✔
97	EXPECT_EQ(it.index(), 1u);	1!
98	EXPECT_EQ(*it, 0x06u);	1!
99
100	++it; // pos=2	1✔
101	EXPECT_EQ(it.index(), 2u);	1!
102	EXPECT_EQ(*it, 0x07u);	1!
103
104	++it; // pos=3	1✔
105	EXPECT_EQ(it.index(), 3u);	1!
106	EXPECT_EQ(*it, 0x08u);	1!
107	}	1✔
108
109	TEST(BitIteratorAdapter_BigToSmall, OperatorStarAndArrow) {	1✔
110	// Use a single base word = 0xAABBCCDD
111	uint32_t base_val = 0xAABBCCDDu;	1✔
112	// Memory bytes: { DD, CC, BB, AA } little-endian
113	using Iter8 = uint8_t*;	1✔
114	using Base32 = uint32_t*;	1✔
115	using Adapter8_32 = bit::bit_word_pointer_adapter<Iter8, Base32>;	1✔
116
117	Adapter8_32 it(&base_val, /pos=/0);	1✔
118
119	EXPECT_EQ(*it, 0xDDu);	1!
120	// operator->() should return a pointer to the byte
121	auto p = *it;	1✔
122	EXPECT_EQ(p, 0xDDu);	1!
123
124	// Move to pos=2
125	it += 2;	1✔
126	EXPECT_EQ(*it, 0xBBu);	1!
127	EXPECT_EQ(it.index(), 2u);	1!
128
129	// operator->() at pos=2
130	p = *it;	1✔
131	EXPECT_EQ(p, 0xBBu);	1!
132	}	1✔
133
134	TEST(BitIteratorAdapter_BigToSmall, OperatorPlusMinusAndDistance) {	1✔
135	// Fill two 32-bit words
136	uint32_t base_arr[2] = {0x11223344u, 0x55667788u};	1✔
137	// Bytes: {44,33,22,11, 88,77,66,55}
138
139	using Iter8 = uint8_t*;	1✔
140	using Base32 = uint32_t*;	1✔
141	using Adapter8_32 = bit::bit_word_pointer_adapter<Iter8, Base32>;	1✔
142
143	Adapter8_32 it(base_arr, /pos=/0); // points at first byte (0x44)	1✔
144
145	// it + 3 => should point to 4th byte of base_arr[0] = 0x11
146	auto it3 = it + 3;	1✔
147	EXPECT_EQ(it3.base(), base_arr);	1!
148	EXPECT_EQ(it3.index(), 3u);	1!
149	EXPECT_EQ(*it3, 0x11u);	1!
150
151	// it + 4 => moves into base_arr[1], pos=0 => should be 0x88
152	auto it4 = it + 4;	1✔
153	EXPECT_EQ(it4.base(), base_arr + 1);	1!
154	EXPECT_EQ(it4.index(), 0u);	1!
155	EXPECT_EQ(*it4, 0x88u);	1!
156
157	// Now distance between it and it+7 = 7
158	auto it7 = it + 7;	1✔
159	EXPECT_EQ(it7.base(), base_arr + 1);	1!
160	EXPECT_EQ(it7.index(), 3u);	1!
161	EXPECT_EQ(*it7, 0x55u);	1!
162
163	EXPECT_EQ(it7 - it, 7);	1!
164	EXPECT_EQ(it - it, 0);	1!
165
166	// Test operator- (iterator difference) with reversed operands
167	EXPECT_EQ((it - it7), -7);	1!
168
169	// Advance it4 by -2 => (it4 - 2) = it + 2 => base_arr[0], pos=2 => 0x22
170	auto it2 = it4 - 2;	1✔
171	EXPECT_EQ(it2.base(), base_arr);	1!
172	EXPECT_EQ(it2.index(), 2u);	1!
173	EXPECT_EQ(*it2, 0x22u);	1!
174	}	1✔
175
176	TEST(BitIteratorAdapter_BigToSmall, OperatorSubscript) {	1✔
177	// 1 uint32_t: 0xDEADBEEFu => bytes { EF, BE, AD, DE }
178	uint32_t base_val = 0xDEADBEEFu;	1✔
179	using Iter8 = uint8_t*;	1✔
180	using Base32 = uint32_t*;	1✔
181	using Adapter8_32 = bit::bit_word_pointer_adapter<Iter8, Base32>;	1✔
182
183	Adapter8_32 it(&base_val, /pos=/0);	1✔
184	// it[0] == 0xEF, it[1] == 0xBE, it[2] == 0xAD, it[3] == 0xDE
185	EXPECT_EQ(it[0], static_cast<uint8_t>(0xEFu));	1!
186	EXPECT_EQ(it[1], static_cast<uint8_t>(0xBEu));	1!
187	EXPECT_EQ(it[2], static_cast<uint8_t>(0xADu));	1!
188	EXPECT_EQ(it[3], static_cast<uint8_t>(0xDEu));	1!
189
190	// Negative index: it[ -1 ] => moves to previous base word;
191	// but since there's no previous word, behavior is UB. We skip testing negative here.
192
193	// If we do it + 4, then subscript( it + 4 )[0] should be same as it[4]
194	auto it_shift = it + 4; // rolls into next base (out-of-bounds, but for test allocate two words)	1✔
195	// For safety, create two‐element array:
196	uint32_t arr2[2] = {0x01020304u, 0x05060708u};	1✔
197	Adapter8_32 it2(arr2, 0);	1✔
198	EXPECT_EQ(it2[0], 0x04u);	1!
199	EXPECT_EQ(it2[1], 0x03u);	1!
200	EXPECT_EQ(it2[2], 0x02u);	1!
201	EXPECT_EQ(it2[3], 0x01u);	1!
202	EXPECT_EQ(it2[4], 0x08u);	1!
203	EXPECT_EQ(it2[5], 0x07u);	1!
204	EXPECT_EQ(it2[6], 0x06u);	1!
205	EXPECT_EQ(it2[7], 0x05u);	1!
206	}	1✔
207
208	// -----------------------------------------------------------------------------
209	// TEST SUITE: Small-to-Large Mode (BaseIterator.value_type < Iterator.value_type)
210	// -----------------------------------------------------------------------------
211	TEST(BitIteratorAdapter_SmallToLarge, DereferenceAndIncrement) {	1✔
212	// Base: array of uint8_t; Iterator’s value_type = uint16_t => ratio = 2
213	uint8_t base_arr[] = {	1✔
214	0x11, 0x22, // first 16-bit chunk => 0x2211	1✔
215	0x33, 0x44, // second 16-bit chunk => 0x4433	1✔
216	0x55, 0x66 // third 16-bit chunk => 0x6655	1✔
217	};	1✔
218	using Iter16 = uint16_t*;	1✔
219	using Base8 = uint8_t*;	1✔
220	using Adapter16_8 = bit::bit_word_pointer_adapter<Iter16, Base8>;	1✔
221
222	Adapter16_8 it(base_arr);	1✔
223
224	// *it: combine base[0] + (base[1] << 8) => 0x2211
225	uint16_t first = *it;	1✔
226	EXPECT_EQ(first, static_cast<uint16_t>(0x2211u));	1!
227
228	// ++it => skip 2 bytes: now base points to base_arr+2
229	++it;	1✔
230	uint16_t second = *it;	1✔
231	EXPECT_EQ(second, static_cast<uint16_t>(0x4433u));	1!
232
233	// ++it again
234	++it;	1✔
235	uint16_t third = *it;	1✔
236	EXPECT_EQ(third, static_cast<uint16_t>(0x6655u));	1!
237	}	1✔
238
239	TEST(BitIteratorAdapter_SmallToLarge, OperatorPlusMinusDistance) {	1✔
240	// Base: eight uint8_t => four uint16_t logical elements
241	uint8_t base_arr[8] = {	1✔
242	0x10, 0x01, // 0x0110	1✔
243	0x20, 0x02, // 0x0220	1✔
244	0x30, 0x03, // 0x0330	1✔
245	0x40, 0x04 // 0x0440	1✔
246	};	1✔
247	using Iter16 = uint16_t*;	1✔
248	using Base8 = uint8_t*;	1✔
249	using Adapter16_8 = bit::bit_word_pointer_adapter<Iter16, Base8>;	1✔
250
251	Adapter16_8 it(base_arr);	1✔
252
253	// it + 0 => *it == 0x0110
254	EXPECT_EQ(*it, static_cast<uint16_t>(0x0110u));	1!
255
256	// it + 1 => combine bytes at indices [2,3] => 0x0220
257	auto it1 = it + 1;	1✔
258	EXPECT_EQ(*it1, static_cast<uint16_t>(0x0220u));	1!
259
260	// it + 2 => 0x0330
261	auto it2 = it + 2;	1✔
262	EXPECT_EQ(*it2, static_cast<uint16_t>(0x0330u));	1!
263
264	// it + 3 => 0x0440
265	auto it3 = it + 3;	1✔
266	EXPECT_EQ(*it3, static_cast<uint16_t>(0x0440u));	1!
267
268	// Distance: it3 - it == 3
269	EXPECT_EQ(it3 - it, 3);	1!
270	EXPECT_EQ(it - it, 0);	1!
271
272	// it2 - it1 == 1
273	EXPECT_EQ(it2 - it1, 1);	1!
274
275	// Subtraction reversed:
276	EXPECT_EQ(it - it3, -3);	1!
277	}	1✔
278
279	TEST(BitIteratorAdapter_SmallToLarge, OperatorStarAndArrow) {	1✔
280	uint8_t base_arr[4] = {0xAA, 0xBB, 0xCC, 0xDD};	1✔
281	using Iter16 = uint16_t*;	1✔
282	using Base8 = uint8_t*;	1✔
283	using Adapter16_8 = bit::bit_word_pointer_adapter<Iter16, Base8>;	1✔
284
285	Adapter16_8 it(base_arr);	1✔
286	// *it => (0xBB << 8) \| 0xAA = 0xBBAA
287	EXPECT_EQ(*it, static_cast<uint16_t>(0xBBAAu));	1!
288	}	1✔
289
290	TEST(BitIteratorAdapter_SmallToLarge, OperatorPlusEqualsAndMinusEquals) {	1✔
291	// Base: six uint8_t => three 16-bit words
292	uint8_t base_arr[6] = {	1✔
293	0x01, 0xA0, // 0xA001	1✔
294	0x02, 0xB0, // 0xB002	1✔
295	0x03, 0xC0 // 0xC003	1✔
296	};	1✔
297	using Iter16 = uint16_t*;	1✔
298	using Base8 = uint8_t*;	1✔
299	using Adapter16_8 = bit::bit_word_pointer_adapter<Iter16, Base8>;	1✔
300
301	Adapter16_8 it(base_arr);	1✔
302
303	// it += 1 => now at second 16-bit chunk: 0xB002
304	it += 1;	1✔
305	EXPECT_EQ(*it, static_cast<uint16_t>(0xB002u));	1!
306
307	// it += 1 => now at third: 0xC003
308	it += 1;	1✔
309	EXPECT_EQ(*it, static_cast<uint16_t>(0xC003u));	1!
310
311	// it -= 2 => go back to first chunk: 0xA001
312	it -= 2;	1✔
313	EXPECT_EQ(*it, static_cast<uint16_t>(0xA001u));	1!
314	}	1✔
315
316	TEST(BitIteratorAdapter_SmallToLarge, OperatorMinusBetweenDifferentIterators) {	1✔
317	// Base: eight uint8_t => four 16-bit words
318	uint8_t base_arr[8] = {	1✔
319	0x01, 0x10, // 0x1001	1✔
320	0x02, 0x20, // 0x2002	1✔
321	0x03, 0x30, // 0x3003	1✔
322	0x04, 0x40 // 0x4004	1✔
323	};	1✔
324	using Iter16 = uint16_t*;	1✔
325	using Base8 = uint8_t*;	1✔
326	using Adapter16_8 = bit::bit_word_pointer_adapter<Iter16, Base8>;	1✔
327
328	Adapter16_8 it0(base_arr);	1✔
329	Adapter16_8 it2(base_arr + 4); // same as (it0 + 2)	1✔
330
331	EXPECT_EQ(it2 - it0, 2);	1!
332	EXPECT_EQ(it0 - it2, -2);	1!
333	}	1✔

PeterCDMcLean / BitLib / 15477382360

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