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// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
10// ADDITIONAL_COMPILE_FLAGS(has-fconstexpr-steps): -fconstexpr-steps=2000000
11
12// template<container-compatible-range<bool> R>
13// constexpr void assign_range(R&& rg); // C++23
14
15#include <sstream>
16#include <vector>
17
18#include "../insert_range_sequence_containers.h"
19#include "test_macros.h"
20
21// Tested cases:
22// - different kinds of assignments (assigning an {empty/one-element/mid-sized/long range} to an
23// {empty/one-element/full} container);
24// - an exception is thrown when allocating new elements.
25constexpr bool test() {
26 static_assert(test_constraints_assign_range<std::vector, bool, char>());
27
28 for_all_iterators_and_allocators<bool, const int*>([]<class Iter, class Sent, class Alloc>() {
29 test_sequence_assign_range<std::vector<bool, Alloc>, Iter, Sent>([]([[maybe_unused]] auto&& c) {
30 LIBCPP_ASSERT(c.__invariants());
31 // `is_contiguous_container_asan_correct` doesn't work on `vector<bool>`.
32 });
33 });
34
35 { // Vector may or may not need to reallocate because of the assignment -- make sure to test both cases.
36 { // Ensure reallocation happens. Note that `vector<bool>` typically reserves a lot of capacity.
37 constexpr int N = 255;
38 bool in[N] = {};
39 std::vector<bool> v = {0, 0, 0, 1, 1, 0, 0, 0};
40 assert(v.capacity() < v.size() + std::ranges::size(in));
41
42 v.assign_range(in);
43 assert(std::ranges::equal(v, in));
44 }
45
46 { // Ensure no reallocation happens.
47 bool in[] = {1, 1, 0, 1, 1};
48 std::vector<bool> v = {0, 0, 0, 1, 1, 0, 0, 0};
49
50 v.assign_range(in);
51 assert(std::ranges::equal(v, in));
52 }
53
54 { // Ensure input-only sized ranges are accepted.
55 using input_iter = cpp20_input_iterator<const bool*>;
56 const bool in[]{true, true, false, true};
57 std::vector<bool> v;
58 v.assign_range(std::views::counted(input_iter{std::ranges::begin(in)}, std::ranges::ssize(in)));
59 assert(std::ranges::equal(v, std::vector<bool>{true, true, false, true}));
60 }
61 }
62
63 return true;
64}
65
66#ifndef TEST_HAS_NO_LOCALIZATION
67void test_counted_istream_view() {
68 std::istringstream is{"1 1 0 1"};
69 auto vals = std::views::istream<bool>(is);
70 std::vector<bool> v;
71 v.assign_range(std::views::counted(vals.begin(), 3));
72 assert(v == (std::vector{true, true, false}));
73}
74#endif
75
76int main(int, char**) {
77 test();
78 static_assert(test());
79
80 // Note: `test_assign_range_exception_safety_throwing_copy` doesn't apply because copying booleans cannot throw.
81 test_assign_range_exception_safety_throwing_allocator<std::vector, bool>();
82
83#ifndef TEST_HAS_NO_LOCALIZATION
84 test_counted_istream_view();
85#endif
86
87 return 0;
88}
89

source code of libcxx/test/std/containers/sequences/vector.bool/assign_range.pass.cpp