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 // iterator insert(const_iterator p, charT c); // constexpr since C++20 12 13 #include <string> 14 #include <stdexcept> 15 #include <cassert> 16 17 #include "test_macros.h" 18 #include "min_allocator.h" 19 20 template <class S> 21 TEST_CONSTEXPR_CXX20 void 22 test(S& s, typename S::const_iterator p, typename S::value_type c, S expected) 23 { 24 bool sufficient_cap = s.size() < s.capacity(); 25 typename S::difference_type pos = p - s.begin(); 26 typename S::iterator i = s.insert(p, c); 27 LIBCPP_ASSERT(s.__invariants()); 28 assert(s == expected); 29 assert(i - s.begin() == pos); 30 assert(*i == c); 31 if (sufficient_cap) 32 assert(i == p); 33 } 34 35 template <class S> 36 TEST_CONSTEXPR_CXX20 void test_string() { 37 S s; 38 test(s, s.begin(), '1', S("1")); 39 test(s, s.begin(), 'a', S("a1")); 40 test(s, s.end(), 'b', S("a1b")); 41 test(s, s.end()-1, 'c', S("a1cb")); 42 test(s, s.end()-2, 'd', S("a1dcb")); 43 test(s, s.end()-3, '2', S("a12dcb")); 44 test(s, s.end()-4, '3', S("a132dcb")); 45 test(s, s.end()-5, '4', S("a1432dcb")); 46 test(s, s.begin()+1, '5', S("a51432dcb")); 47 test(s, s.begin()+2, '6', S("a561432dcb")); 48 test(s, s.begin()+3, '7', S("a5671432dcb")); 49 test(s, s.begin()+4, 'A', S("a567A1432dcb")); 50 test(s, s.begin()+5, 'B', S("a567AB1432dcb")); 51 test(s, s.begin()+6, 'C', S("a567ABC1432dcb")); 52 } 53 54 TEST_CONSTEXPR_CXX20 bool test() { 55 test_string<std::string>(); 56 #if TEST_STD_VER >= 11 57 test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>(); 58 #endif 59 60 return true; 61 } 62 63 int main(int, char**) 64 { 65 test(); 66 #if TEST_STD_VER > 17 67 static_assert(test()); 68 #endif 69 70 return 0; 71 } 72