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<charT,traits,Allocator>& operator=(basic_string_view<charT, traits> sv); // constexpr since C++20 12 13 #include <string> 14 #include <cassert> 15 16 #include "test_macros.h" 17 #include "min_allocator.h" 18 19 template <class S, class SV> 20 TEST_CONSTEXPR_CXX20 void 21 test(S s1, SV sv) 22 { 23 typedef typename S::traits_type T; 24 s1 = sv; 25 LIBCPP_ASSERT(s1.__invariants()); 26 assert(s1.size() == sv.size()); 27 assert(T::compare(s1.data(), sv.data(), s1.size()) == 0); 28 assert(s1.capacity() >= s1.size()); 29 } 30 31 template <class S> 32 TEST_CONSTEXPR_CXX20 void test_string() { 33 typedef std::string_view SV; 34 test(S(), SV("")); 35 test(S("1"), SV("")); 36 test(S(), SV("1")); 37 test(S("1"), SV("2")); 38 test(S("1"), SV("2")); 39 40 test(S(), 41 SV("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz")); 42 test(S("123456789"), 43 SV("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz")); 44 test(S("1234567890123456789012345678901234567890123456789012345678901234567890"), 45 SV("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz")); 46 test(S("1234567890123456789012345678901234567890123456789012345678901234567890" 47 "1234567890123456789012345678901234567890123456789012345678901234567890"), 48 SV("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz")); 49 } 50 51 TEST_CONSTEXPR_CXX20 bool test() { 52 test_string<std::string>(); 53 #if TEST_STD_VER >= 11 54 test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>(); 55 #endif 56 57 return true; 58 } 59 60 int main(int, char**) 61 { 62 test(); 63 #if TEST_STD_VER > 17 64 static_assert(test()); 65 #endif 66 67 return 0; 68 } 69