1//===----------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9// <deque>
10
11// Optimization for deque::iterators
12
13// template <class InputIterator, class OutputIterator>
14// OutputIterator
15// move_backward(InputIterator first, InputIterator last, OutputIterator result);
16
17#include "asan_testing.h"
18#include <deque>
19#include <cassert>
20
21#include "test_macros.h"
22#include "test_iterators.h"
23#include "min_allocator.h"
24
25template <class C>
26C
27make(int size, int start = 0 )
28{
29 const int b = 4096 / sizeof(int);
30 int init = 0;
31 if (start > 0)
32 {
33 init = (start+1) / b + ((start+1) % b != 0);
34 init *= b;
35 --init;
36 }
37 C c(init, 0);
38 for (int i = 0; i < init-start; ++i)
39 c.pop_back();
40 for (int i = 0; i < size; ++i)
41 c.push_back(i);
42 for (int i = 0; i < start; ++i)
43 c.pop_front();
44 return c;
45}
46
47template <class C>
48void testN(int start, int N)
49{
50 typedef typename C::iterator I;
51 typedef typename C::const_iterator CI;
52 typedef random_access_iterator<I> RAI;
53 typedef random_access_iterator<CI> RACI;
54 C c1 = make<C>(N, start);
55 C c2 = make<C>(N);
56 assert(std::move_backward(c1.cbegin(), c1.cend(), c2.end()) == c2.begin());
57 assert(c1 == c2);
58 LIBCPP_ASSERT(is_double_ended_contiguous_container_asan_correct(c1));
59 LIBCPP_ASSERT(is_double_ended_contiguous_container_asan_correct(c2));
60 assert(std::move_backward(c2.cbegin(), c2.cend(), c1.end()) == c1.begin());
61 assert(c1 == c2);
62 LIBCPP_ASSERT(is_double_ended_contiguous_container_asan_correct(c1));
63 LIBCPP_ASSERT(is_double_ended_contiguous_container_asan_correct(c2));
64 assert(std::move_backward(c1.cbegin(), c1.cend(), RAI(c2.end())) == RAI(c2.begin()));
65 assert(c1 == c2);
66 LIBCPP_ASSERT(is_double_ended_contiguous_container_asan_correct(c1));
67 LIBCPP_ASSERT(is_double_ended_contiguous_container_asan_correct(c2));
68 assert(std::move_backward(c2.cbegin(), c2.cend(), RAI(c1.end())) == RAI(c1.begin()));
69 assert(c1 == c2);
70 LIBCPP_ASSERT(is_double_ended_contiguous_container_asan_correct(c1));
71 LIBCPP_ASSERT(is_double_ended_contiguous_container_asan_correct(c2));
72 assert(std::move_backward(RACI(c1.cbegin()), RACI(c1.cend()), c2.end()) == c2.begin());
73 assert(c1 == c2);
74 LIBCPP_ASSERT(is_double_ended_contiguous_container_asan_correct(c1));
75 LIBCPP_ASSERT(is_double_ended_contiguous_container_asan_correct(c2));
76 assert(std::move_backward(RACI(c2.cbegin()), RACI(c2.cend()), c1.end()) == c1.begin());
77 assert(c1 == c2);
78 LIBCPP_ASSERT(is_double_ended_contiguous_container_asan_correct(c1));
79 LIBCPP_ASSERT(is_double_ended_contiguous_container_asan_correct(c2));
80}
81
82int main(int, char**)
83{
84 {
85 int rng[] = {0, 1, 2, 3, 1023, 1024, 1025, 2047, 2048, 2049};
86 const int N = sizeof(rng)/sizeof(rng[0]);
87 for (int i = 0; i < N; ++i)
88 for (int j = 0; j < N; ++j)
89 testN<std::deque<int> >(start: rng[i], N: rng[j]);
90 }
91#if TEST_STD_VER >= 11
92 {
93 int rng[] = {0, 1, 2, 3, 1023, 1024, 1025, 2047, 2048, 2049};
94 const int N = sizeof(rng)/sizeof(rng[0]);
95 for (int i = 0; i < N; ++i)
96 for (int j = 0; j < N; ++j)
97 testN<std::deque<int, min_allocator<int> > >(rng[i], rng[j]);
98 }
99#endif
100
101 return 0;
102}
103

source code of libcxx/test/std/containers/sequences/deque/deque.special/move_backward.pass.cpp