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 // template<class InputIterator> 12 // basic_string& assign(InputIterator first, InputIterator last); // constexpr since C++20 13 14 #include <string> 15 #include <cassert> 16 17 #include "test_macros.h" 18 #include "test_iterators.h" 19 #include "min_allocator.h" 20 21 template <class S, class It> 22 TEST_CONSTEXPR_CXX20 void test(S s, It first, It last, S expected) { 23 s.assign(first, last); 24 LIBCPP_ASSERT(s.__invariants()); 25 assert(s == expected); 26 } 27 28 #ifndef TEST_HAS_NO_EXCEPTIONS 29 struct Widget { 30 operator char() const { throw 42; } 31 }; 32 33 template <class S, class It> 34 void test_exceptions(S s, It first, It last) { 35 S original = s; 36 typename S::iterator begin = s.begin(); 37 typename S::iterator end = s.end(); 38 39 try { 40 s.assign(first, last); 41 assert(false); 42 } catch (...) { 43 } 44 45 // Part of "no effects" is that iterators and pointers 46 // into the string must not have been invalidated. 47 LIBCPP_ASSERT(s.__invariants()); 48 assert(s == original); 49 assert(s.begin() == begin); 50 assert(s.end() == end); 51 } 52 #endif 53 54 template <class S> 55 TEST_CONSTEXPR_CXX20 void test_string() { 56 { 57 const char* s = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"; 58 test(S(), s, s, S()); 59 test(S(), s, s + 1, S("A")); 60 test(S(), s, s + 10, S("ABCDEFGHIJ")); 61 test(S(), s, s + 52, S("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz")); 62 63 test(S("12345"), s, s, S()); 64 test(S("12345"), s, s + 1, S("A")); 65 test(S("12345"), s, s + 10, S("ABCDEFGHIJ")); 66 test(S("12345"), s, s + 52, S("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz")); 67 68 test(S("1234567890"), s, s, S()); 69 test(S("1234567890"), s, s + 1, S("A")); 70 test(S("1234567890"), s, s + 10, S("ABCDEFGHIJ")); 71 test(S("1234567890"), s, s + 52, S("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz")); 72 73 test(S("12345678901234567890"), s, s, S()); 74 test(S("12345678901234567890"), s, s + 1, S("A")); 75 test(S("12345678901234567890"), s, s + 10, S("ABCDEFGHIJ")); 76 test(S("12345678901234567890"), s, s + 52, S("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz")); 77 78 test(S(), cpp17_input_iterator<const char*>(s), cpp17_input_iterator<const char*>(s), S()); 79 test(S(), cpp17_input_iterator<const char*>(s), cpp17_input_iterator<const char*>(s + 1), S("A")); 80 test(S(), cpp17_input_iterator<const char*>(s), cpp17_input_iterator<const char*>(s + 10), S("ABCDEFGHIJ")); 81 test(S(), 82 cpp17_input_iterator<const char*>(s), 83 cpp17_input_iterator<const char*>(s + 52), 84 S("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz")); 85 86 test(S("12345"), cpp17_input_iterator<const char*>(s), cpp17_input_iterator<const char*>(s), S()); 87 test(S("12345"), cpp17_input_iterator<const char*>(s), cpp17_input_iterator<const char*>(s + 1), S("A")); 88 test(S("12345"), cpp17_input_iterator<const char*>(s), cpp17_input_iterator<const char*>(s + 10), S("ABCDEFGHIJ")); 89 test(S("12345"), 90 cpp17_input_iterator<const char*>(s), 91 cpp17_input_iterator<const char*>(s + 52), 92 S("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz")); 93 94 test(S("1234567890"), cpp17_input_iterator<const char*>(s), cpp17_input_iterator<const char*>(s), S()); 95 test(S("1234567890"), cpp17_input_iterator<const char*>(s), cpp17_input_iterator<const char*>(s + 1), S("A")); 96 test(S("1234567890"), 97 cpp17_input_iterator<const char*>(s), 98 cpp17_input_iterator<const char*>(s + 10), 99 S("ABCDEFGHIJ")); 100 test(S("1234567890"), 101 cpp17_input_iterator<const char*>(s), 102 cpp17_input_iterator<const char*>(s + 52), 103 S("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz")); 104 105 test(S("12345678901234567890"), cpp17_input_iterator<const char*>(s), cpp17_input_iterator<const char*>(s), S()); 106 test(S("12345678901234567890"), 107 cpp17_input_iterator<const char*>(s), 108 cpp17_input_iterator<const char*>(s + 1), 109 S("A")); 110 test(S("12345678901234567890"), 111 cpp17_input_iterator<const char*>(s), 112 cpp17_input_iterator<const char*>(s + 10), 113 S("ABCDEFGHIJ")); 114 test(S("12345678901234567890"), 115 cpp17_input_iterator<const char*>(s), 116 cpp17_input_iterator<const char*>(s + 52), 117 S("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz")); 118 } 119 120 #ifndef TEST_HAS_NO_EXCEPTIONS 121 if (!TEST_IS_CONSTANT_EVALUATED) { // test iterator operations that throw 122 typedef ThrowingIterator<char> TIter; 123 typedef cpp17_input_iterator<TIter> IIter; 124 const char* s = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"; 125 test_exceptions(S(), IIter(TIter(s, s + 10, 4, TIter::TAIncrement)), IIter(TIter())); 126 test_exceptions(S(), IIter(TIter(s, s + 10, 5, TIter::TADereference)), IIter(TIter())); 127 test_exceptions(S(), IIter(TIter(s, s + 10, 6, TIter::TAComparison)), IIter(TIter())); 128 129 test_exceptions(S(), TIter(s, s + 10, 4, TIter::TAIncrement), TIter()); 130 test_exceptions(S(), TIter(s, s + 10, 5, TIter::TADereference), TIter()); 131 test_exceptions(S(), TIter(s, s + 10, 6, TIter::TAComparison), TIter()); 132 133 Widget w[100]; 134 test_exceptions(S(), w, w + 100); 135 } 136 #endif 137 138 { // test assigning to self 139 S s_short = "123/"; 140 S s_long = "Lorem ipsum dolor sit amet, consectetur/"; 141 142 s_short.assign(s_short.begin(), s_short.end()); 143 assert(s_short == "123/"); 144 s_short.assign(s_short.begin() + 2, s_short.end()); 145 assert(s_short == "3/"); 146 147 s_long.assign(s_long.begin(), s_long.end()); 148 assert(s_long == "Lorem ipsum dolor sit amet, consectetur/"); 149 150 s_long.assign(s_long.begin() + 30, s_long.end()); 151 assert(s_long == "nsectetur/"); 152 } 153 154 { // test assigning a different type 155 const std::uint8_t p[] = "ABCD"; 156 157 S s; 158 s.assign(p, p + 4); 159 assert(s == "ABCD"); 160 } 161 162 { // regression-test assigning to self in sneaky ways 163 S sneaky = "hello"; 164 sneaky.resize(sneaky.capacity(), 'x'); 165 S expected = sneaky + S(1, '\0'); 166 test(sneaky, sneaky.data(), sneaky.data() + sneaky.size() + 1, expected); 167 } 168 } 169 170 TEST_CONSTEXPR_CXX20 bool test() { 171 test_string<std::string>(); 172 #if TEST_STD_VER >= 11 173 test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >(); 174 #endif 175 176 return true; 177 } 178 179 int main(int, char**) { 180 test(); 181 #if TEST_STD_VER > 17 182 static_assert(test()); 183 #endif 184 185 return 0; 186 } 187