1 //===----------------------------------------------------------------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is dual licensed under the MIT and the University of Illinois Open 6 // Source Licenses. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 // <string> 11 12 // Split into two calls for C++20 13 // void reserve(); 14 // void reserve(size_type res_arg); 15 16 #include <string> 17 #include <stdexcept> 18 #include <cassert> 19 20 #include "test_macros.h" 21 #include "min_allocator.h" 22 23 template <class S> 24 void 25 test(S s) 26 { 27 typename S::size_type old_cap = s.capacity(); 28 S s0 = s; 29 s.reserve(); 30 LIBCPP_ASSERT(s.__invariants()); 31 assert(s == s0); 32 assert(s.capacity() <= old_cap); 33 assert(s.capacity() >= s.size()); 34 } 35 36 template <class S> 37 void 38 test(S s, typename S::size_type res_arg) 39 { 40 typename S::size_type old_cap = s.capacity(); 41 ((void)old_cap); // Prevent unused warning 42 S s0 = s; 43 if (res_arg <= s.max_size()) 44 { 45 s.reserve(res_arg); 46 assert(s == s0); 47 assert(s.capacity() >= res_arg); 48 assert(s.capacity() >= s.size()); 49 #if TEST_STD_VER > 17 50 assert(s.capacity() >= old_cap); // resize never shrinks as of P0966 51 #endif 52 } 53 #ifndef TEST_HAS_NO_EXCEPTIONS 54 else 55 { 56 try 57 { 58 s.reserve(res_arg); 59 assert(false); 60 } 61 catch (std::length_error&) 62 { 63 assert(res_arg > s.max_size()); 64 } 65 } 66 #endif 67 } 68 69 int main() 70 { 71 { 72 typedef std::string S; 73 { 74 S s; 75 test(s); 76 77 s.assign(10, 'a'); 78 s.erase(5); 79 test(s); 80 81 s.assign(100, 'a'); 82 s.erase(50); 83 test(s); 84 } 85 { 86 S s; 87 test(s, 5); 88 test(s, 10); 89 test(s, 50); 90 } 91 { 92 S s(100, 'a'); 93 s.erase(50); 94 test(s, 5); 95 test(s, 10); 96 test(s, 50); 97 test(s, 100); 98 test(s, 1000); 99 test(s, S::npos); 100 } 101 } 102 #if TEST_STD_VER >= 11 103 { 104 typedef std::basic_string<char, std::char_traits<char>, min_allocator<char>> S; 105 { 106 S s; 107 test(s); 108 109 s.assign(10, 'a'); 110 s.erase(5); 111 test(s); 112 113 s.assign(100, 'a'); 114 s.erase(50); 115 test(s); 116 } 117 { 118 S s; 119 test(s, 5); 120 test(s, 10); 121 test(s, 50); 122 } 123 { 124 S s(100, 'a'); 125 s.erase(50); 126 test(s, 5); 127 test(s, 10); 128 test(s, 50); 129 test(s, 100); 130 test(s, 1000); 131 test(s, S::npos); 132 } 133 } 134 #endif 135 } 136
