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
10
11// <string>
12
13// basic_string(basic_string&& str, const Allocator& alloc); // constexpr since C++20
14
15#include <string>
16#include <cassert>
17
18#include "test_macros.h"
19#include "test_allocator.h"
20#include "min_allocator.h"
21#include "asan_testing.h"
22#include "operator_hijacker.h"
23
24template <class S>
25TEST_CONSTEXPR_CXX20 void test(S s0, const typename S::allocator_type& a) {
26 S s1 = s0;
27 S s2(std::move(s0), a);
28 LIBCPP_ASSERT(s2.__invariants());
29 LIBCPP_ASSERT(s0.__invariants());
30 assert(s2 == s1);
31 assert(s2.capacity() >= s2.size());
32 assert(s2.get_allocator() == a);
33 LIBCPP_ASSERT(is_string_asan_correct(s0));
34 LIBCPP_ASSERT(is_string_asan_correct(s1));
35 LIBCPP_ASSERT(is_string_asan_correct(s2));
36}
37
38TEST_CONSTEXPR_CXX20 bool test() {
39 test_allocator_statistics alloc_stats;
40 {
41 typedef test_allocator<char> A;
42 typedef std::basic_string<char, std::char_traits<char>, A> S;
43#if TEST_STD_VER > 14
44 static_assert((noexcept(S{})), "");
45#elif TEST_STD_VER >= 11
46 static_assert((noexcept(S()) == std::is_nothrow_move_constructible<A>::value), "");
47#endif
48 test(S(), A(3, &alloc_stats));
49 test(S("1"), A(5, &alloc_stats));
50 test(S("1234567890123456789012345678901234567890123456789012345678901234567890"), A(7, &alloc_stats));
51 }
52
53 int alloc_count = alloc_stats.alloc_count;
54 {
55 typedef test_allocator<char> A;
56 typedef std::basic_string<char, std::char_traits<char>, A> S;
57#if TEST_STD_VER > 14
58 static_assert((noexcept(S{})), "");
59#elif TEST_STD_VER >= 11
60 static_assert((noexcept(S()) == std::is_nothrow_move_constructible<A>::value), "");
61#endif
62 S s1("Twas brillig, and the slivy toves did gyre and gymbal in the wabe", A(&alloc_stats));
63 S s2(std::move(s1), A(1, &alloc_stats));
64 }
65 assert(alloc_stats.alloc_count == alloc_count);
66 {
67 typedef min_allocator<char> A;
68 typedef std::basic_string<char, std::char_traits<char>, A> S;
69#if TEST_STD_VER > 14
70 static_assert((noexcept(S{})), "");
71#elif TEST_STD_VER >= 11
72 static_assert((noexcept(S()) == std::is_nothrow_move_constructible<A>::value), "");
73#endif
74 test(S(), A());
75 test(S("1"), A());
76 test(S("1234567890123456789012345678901234567890123456789012345678901234567890"), A());
77 }
78 {
79 typedef operator_hijacker_allocator<char> A;
80 typedef std::basic_string<char, std::char_traits<char>, A> S;
81#if TEST_STD_VER > 14
82 static_assert((noexcept(S{})), "");
83#elif TEST_STD_VER >= 11
84 static_assert((noexcept(S()) == std::is_nothrow_move_constructible<A>::value), "");
85#endif
86 test(S(), A());
87 test(S("1"), A());
88 test(S("1234567890123456789012345678901234567890123456789012345678901234567890"), A());
89 }
90
91 return true;
92}
93
94int main(int, char**) {
95 test();
96#if TEST_STD_VER > 17
97 static_assert(test());
98#endif
99
100 return 0;
101}
102

source code of libcxx/test/std/strings/basic.string/string.cons/move_alloc.pass.cpp