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 substr(size_type pos = 0, size_type n = npos) const; // constexpr since C++20, removed in C++23 12 // basic_string substr(size_type pos = 0, size_type n = npos) const&; // since in C++23 13 14 #include <string> 15 #include <stdexcept> 16 #include <algorithm> 17 #include <cassert> 18 19 #include "test_allocator.h" 20 #include "test_macros.h" 21 #include "min_allocator.h" 22 23 template <class S> 24 TEST_CONSTEXPR_CXX20 void test(const S& s, typename S::size_type pos, typename S::size_type n) { 25 if (pos <= s.size()) { 26 S str = s.substr(pos, n); 27 LIBCPP_ASSERT(str.__invariants()); 28 assert(pos <= s.size()); 29 typename S::size_type rlen = std::min(n, s.size() - pos); 30 assert(str.size() == rlen); 31 assert(S::traits_type::compare(s.data() + pos, str.data(), rlen) == 0); 32 } 33 #ifndef TEST_HAS_NO_EXCEPTIONS 34 else if (!TEST_IS_CONSTANT_EVALUATED) { 35 try { 36 S str = s.substr(pos, n); 37 assert(false); 38 } catch (std::out_of_range&) { 39 assert(pos > s.size()); 40 } 41 } 42 #endif 43 } 44 45 template <class S> 46 TEST_CONSTEXPR_CXX20 void test_string() { 47 test(S(""), 0, 0); 48 test(S(""), 1, 0); 49 test(S("pniot"), 0, 0); 50 test(S("htaob"), 0, 1); 51 test(S("fodgq"), 0, 2); 52 test(S("hpqia"), 0, 4); 53 test(S("qanej"), 0, 5); 54 test(S("dfkap"), 1, 0); 55 test(S("clbao"), 1, 1); 56 test(S("ihqrf"), 1, 2); 57 test(S("mekdn"), 1, 3); 58 test(S("ngtjf"), 1, 4); 59 test(S("srdfq"), 2, 0); 60 test(S("qkdrs"), 2, 1); 61 test(S("ikcrq"), 2, 2); 62 test(S("cdaih"), 2, 3); 63 test(S("dmajb"), 4, 0); 64 test(S("karth"), 4, 1); 65 test(S("lhcdo"), 5, 0); 66 test(S("acbsj"), 6, 0); 67 test(S("pbsjikaole"), 0, 0); 68 test(S("pcbahntsje"), 0, 1); 69 test(S("mprdjbeiak"), 0, 5); 70 test(S("fhepcrntko"), 0, 9); 71 test(S("eqmpaidtls"), 0, 10); 72 test(S("joidhalcmq"), 1, 0); 73 test(S("omigsphflj"), 1, 1); 74 test(S("kocgbphfji"), 1, 4); 75 test(S("onmjekafbi"), 1, 8); 76 test(S("fbslrjiqkm"), 1, 9); 77 test(S("oqmrjahnkg"), 5, 0); 78 test(S("jeidpcmalh"), 5, 1); 79 test(S("schfalibje"), 5, 2); 80 test(S("crliponbqe"), 5, 4); 81 test(S("igdscopqtm"), 5, 5); 82 test(S("qngpdkimlc"), 9, 0); 83 test(S("thdjgafrlb"), 9, 1); 84 test(S("hcjitbfapl"), 10, 0); 85 test(S("mgojkldsqh"), 11, 0); 86 test(S("gfshlcmdjreqipbontak"), 0, 0); 87 test(S("nadkhpfemgclosibtjrq"), 0, 1); 88 test(S("nkodajteqplrbifhmcgs"), 0, 10); 89 test(S("ofdrqmkeblthacpgijsn"), 0, 19); 90 test(S("gbmetiprqdoasckjfhln"), 0, 20); 91 test(S("bdfjqgatlksriohemnpc"), 1, 0); 92 test(S("crnklpmegdqfiashtojb"), 1, 1); 93 test(S("ejqcnahdrkfsmptilgbo"), 1, 9); 94 test(S("jsbtafedocnirgpmkhql"), 1, 18); 95 test(S("prqgnlbaejsmkhdctoif"), 1, 19); 96 test(S("qnmodrtkebhpasifgcjl"), 10, 0); 97 test(S("pejafmnokrqhtisbcdgl"), 10, 1); 98 test(S("cpebqsfmnjdolhkratgi"), 10, 5); 99 test(S("odnqkgijrhabfmcestlp"), 10, 9); 100 test(S("lmofqdhpkibagnrcjste"), 10, 10); 101 test(S("lgjqketopbfahrmnsicd"), 19, 0); 102 test(S("ktsrmnqagdecfhijpobl"), 19, 1); 103 test(S("lsaijeqhtrbgcdmpfkno"), 20, 0); 104 test(S("dplqartnfgejichmoskb"), 21, 0); 105 } 106 107 TEST_CONSTEXPR_CXX20 bool test() { 108 test_string<std::string>(); 109 #if TEST_STD_VER >= 11 110 test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>(); 111 #endif 112 113 return true; 114 } 115 116 TEST_CONSTEXPR_CXX20 bool test_alloc() { 117 { 118 using alloc = test_allocator<char>; 119 using string = std::basic_string<char, std::char_traits<char>, alloc>; 120 test_allocator_statistics stats; 121 { 122 string str = string(alloc(&stats)); 123 stats = test_allocator_statistics(); 124 (void)str.substr(); 125 assert(stats.moved == 0); 126 assert(stats.copied == 0); 127 } 128 { 129 string str = string(alloc(&stats)); 130 stats = test_allocator_statistics(); 131 (void)std::move(str).substr(); 132 assert(stats.moved == 0); 133 assert(stats.copied == 0); 134 } 135 } 136 137 return true; 138 } 139 140 int main(int, char**) { 141 test(); 142 test_alloc(); 143 #if TEST_STD_VER > 17 144 static_assert(test()); 145 static_assert(test_alloc()); 146 #endif 147 148 return 0; 149 } 150