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
23template <class Alloc, class CharT>
24TEST_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
36template <class Alloc, class CharT>
37TEST_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
49template <class Alloc>
50TEST_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
64TEST_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
84int main(int, char**) {
85 test();
86#if TEST_STD_VER > 17
87 static_assert(test());
88#endif
89
90 return 0;
91}
92

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