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 // UNSUPPORTED: c++03, c++11, c++14, c++17 9 10 // <string> 11 12 // bool starts_with(string_view x) const noexcept; 13 14 #include <string> 15 #include <cassert> 16 17 #include "test_macros.h" 18 19 bool test() { 20 typedef std::string S; 21 typedef std::string_view SV; 22 const char *s = "abcde"; 23 24 S s0; 25 S s1 { s, 1 }; 26 S s2 { s, 2 }; 27 // S s3 { s, 3 }; 28 // S s4 { s, 4 }; 29 // S s5 { s, 5 }; 30 S sNot { "def", 3 }; 31 32 SV sv0; 33 SV sv1 { s, 1 }; 34 SV sv2 { s, 2 }; 35 SV sv3 { s, 3 }; 36 SV sv4 { s, 4 }; 37 SV sv5 { s, 5 }; 38 SV svNot {"def", 3 }; 39 40 ASSERT_NOEXCEPT(s0.starts_with(sv0)); 41 42 assert ( s0.starts_with(sv0)); 43 assert (!s0.starts_with(sv1)); 44 45 assert ( s1.starts_with(sv0)); 46 assert ( s1.starts_with(sv1)); 47 assert (!s1.starts_with(sv2)); 48 assert (!s1.starts_with(sv3)); 49 assert (!s1.starts_with(sv4)); 50 assert (!s1.starts_with(sv5)); 51 assert (!s1.starts_with(svNot)); 52 53 assert ( s2.starts_with(sv0)); 54 assert ( s2.starts_with(sv1)); 55 assert ( s2.starts_with(sv2)); 56 assert (!s2.starts_with(sv3)); 57 assert (!s2.starts_with(sv4)); 58 assert (!s2.starts_with(sv5)); 59 assert (!s2.starts_with(svNot)); 60 61 assert ( sNot.starts_with(sv0)); 62 assert (!sNot.starts_with(sv1)); 63 assert (!sNot.starts_with(sv2)); 64 assert (!sNot.starts_with(sv3)); 65 assert (!sNot.starts_with(sv4)); 66 assert (!sNot.starts_with(sv5)); 67 assert ( sNot.starts_with(svNot)); 68 69 return true; 70 } 71 72 int main(int, char**) 73 { 74 test(); 75 #if TEST_STD_VER > 17 76 // static_assert(test()); 77 #endif 78 79 return 0; 80 } 81