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
11// template<container-compatible-range<charT> R>
12// constexpr basic_string& assign_range(R&& rg); // C++23
13
14#include <string>
15
16#include "../../../../containers/sequences/insert_range_sequence_containers.h"
17#include "test_macros.h"
18#include "asan_testing.h"
19
20// Tested cases:
21// - different kinds of assignments (assigning an {empty/one-element/mid-sized/long range} to an
22// {empty/one-element/full} container);
23// - an exception is thrown when allocating new elements.
24
25constexpr bool test_constexpr() {
26 for_all_iterators_and_allocators_constexpr<char, const char*>(f: []<class Iter, class Sent, class Alloc>() {
27 test_sequence_assign_range<std::basic_string<char, std::char_traits<char>, Alloc>, Iter, Sent>(
28 []([[maybe_unused]] auto&& c) { LIBCPP_ASSERT(c.__invariants()); });
29 });
30
31 return true;
32}
33
34int main(int, char**) {
35 static_assert(test_constraints_assign_range<std::basic_string, char, int>());
36
37 for_all_iterators_and_allocators<char, const char*>(f: []<class Iter, class Sent, class Alloc>() {
38 test_sequence_assign_range<std::basic_string<char, std::char_traits<char>, Alloc>, Iter, Sent>(
39 []([[maybe_unused]] auto&& c) { LIBCPP_ASSERT(c.__invariants()); });
40 });
41 static_assert(test_constexpr());
42
43 { // Check that `assign_range` returns a reference to the string.
44 std::string c;
45 static_assert(std::is_lvalue_reference_v<decltype(c.assign_range(FullContainer_Begin_EmptyRange<char>.input))>);
46 assert(&c.assign_range(FullContainer_Begin_EmptyRange<char>.input) == &c);
47 LIBCPP_ASSERT(is_string_asan_correct(c));
48 assert(&c.assign_range(FullContainer_Begin_OneElementRange<char>.input) == &c);
49 LIBCPP_ASSERT(is_string_asan_correct(c));
50 assert(&c.assign_range(FullContainer_Begin_MidRange<char>.input) == &c);
51 LIBCPP_ASSERT(is_string_asan_correct(c));
52 assert(&c.assign_range(FullContainer_Begin_LongRange<char>.input) == &c);
53 LIBCPP_ASSERT(is_string_asan_correct(c));
54 }
55
56 // Note: `test_assign_range_exception_safety_throwing_copy` doesn't apply because copying chars cannot throw.
57 {
58#if !defined(TEST_HAS_NO_EXCEPTIONS)
59 // Note: the input string must be long enough to prevent SSO, otherwise the allocator won't be used.
60 std::string in(64, 'a');
61
62 try {
63 ThrowingAllocator<char> alloc;
64
65 globalMemCounter.reset();
66 std::basic_string<char, std::char_traits<char>, ThrowingAllocator<char>> c(alloc);
67 c.assign_range(in);
68 assert(false); // The function call above should throw.
69
70 } catch (int) {
71 assert(globalMemCounter.new_called == globalMemCounter.delete_called);
72 }
73#endif
74 }
75
76 return 0;
77}
78

source code of libcxx/test/std/strings/basic.string/string.modifiers/string_assign/assign_range.pass.cpp