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 // <string>
10
11 // basic_string(const charT* s, size_type n, const Allocator& a = Allocator()); // constexpr since C++20
12
13 #include <string>
14 #include <stdexcept>
15 #include <algorithm>
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
23 template <class Alloc, class CharT>
test(const CharT * s,unsigned n)24 TEST_CONSTEXPR_CXX20 void test(const CharT* s, unsigned n) {
25 typedef std::basic_string<CharT, std::char_traits<CharT>, Alloc> S;
26 typedef typename S::traits_type T;
27 S s2(s, n);
28 LIBCPP_ASSERT(s2.__invariants());
29 assert(s2.size() == n);
30 assert(T::compare(s2.data(), s, n) == 0);
31 assert(s2.get_allocator() == Alloc());
32 assert(s2.capacity() >= s2.size());
33 LIBCPP_ASSERT(is_string_asan_correct(s2));
34 }
35
36 template <class Alloc, class CharT>
test(const CharT * s,unsigned n,const Alloc & a)37 TEST_CONSTEXPR_CXX20 void test(const CharT* s, unsigned n, const Alloc& a) {
38 typedef std::basic_string<CharT, std::char_traits<CharT>, Alloc> S;
39 typedef typename S::traits_type T;
40 S s2(s, n, a);
41 LIBCPP_ASSERT(s2.__invariants());
42 assert(s2.size() == n);
43 assert(T::compare(s2.data(), s, n) == 0);
44 assert(s2.get_allocator() == a);
45 assert(s2.capacity() >= s2.size());
46 LIBCPP_ASSERT(is_string_asan_correct(s2));
47 }
48
49 template <class Alloc>
test(const Alloc & a)50 TEST_CONSTEXPR_CXX20 void test(const Alloc& a) {
51 test<Alloc>("", 0);
52 test<Alloc>("", 0, Alloc(a));
53
54 test<Alloc>("1", 1);
55 test<Alloc>("1", 1, Alloc(a));
56
57 test<Alloc>("1234567980", 10);
58 test<Alloc>("1234567980", 10, Alloc(a));
59
60 test<Alloc>("123456798012345679801234567980123456798012345679801234567980", 60);
61 test<Alloc>("123456798012345679801234567980123456798012345679801234567980", 60, Alloc(a));
62 }
63
test()64 TEST_CONSTEXPR_CXX20 bool test() {
65 test(std::allocator<char>());
66 test(test_allocator<char>());
67 test(test_allocator<char>(2));
68 #if TEST_STD_VER >= 11
69 test(min_allocator<char>());
70 test(safe_allocator<char>());
71 #endif
72
73 #if TEST_STD_VER >= 11
74 { // LWG 2946
75 std::string s({"abc", 1});
76 assert(s.size() == 1);
77 assert(s == "a");
78 }
79 #endif
80
81 return true;
82 }
83
main(int,char **)84 int main(int, char**) {
85 test();
86 #if TEST_STD_VER > 17
87 static_assert(test());
88 #endif
89
90 return 0;
91 }
92