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 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17 10 11 // <string_view> 12 13 // constexpr bool starts_with(string_view x) const noexcept; 14 15 #include <string_view> 16 #include <cassert> 17 18 #include "test_macros.h" 19 #include "constexpr_char_traits.hpp" 20 21 int main() 22 { 23 { 24 typedef std::string_view SV; 25 const char *s = "abcde"; 26 SV sv0 {}; 27 SV sv1 { s, 1 }; 28 SV sv2 { s, 2 }; 29 SV sv3 { s, 3 }; 30 SV sv4 { s, 4 }; 31 SV sv5 { s, 5 }; 32 SV svNot {"def", 3 }; 33 34 ASSERT_NOEXCEPT(sv0.starts_with(sv0)); 35 36 assert ( sv0.starts_with(sv0)); 37 assert (!sv0.starts_with(sv1)); 38 39 assert ( sv1.starts_with(sv0)); 40 assert ( sv1.starts_with(sv1)); 41 assert (!sv1.starts_with(sv2)); 42 assert (!sv1.starts_with(sv3)); 43 assert (!sv1.starts_with(sv4)); 44 assert (!sv1.starts_with(sv5)); 45 assert (!sv1.starts_with(svNot)); 46 47 assert ( sv2.starts_with(sv0)); 48 assert ( sv2.starts_with(sv1)); 49 assert ( sv2.starts_with(sv2)); 50 assert (!sv2.starts_with(sv3)); 51 assert (!sv2.starts_with(sv4)); 52 assert (!sv2.starts_with(sv5)); 53 assert (!sv2.starts_with(svNot)); 54 55 assert ( svNot.starts_with(sv0)); 56 assert (!svNot.starts_with(sv1)); 57 assert (!svNot.starts_with(sv2)); 58 assert (!svNot.starts_with(sv3)); 59 assert (!svNot.starts_with(sv4)); 60 assert (!svNot.starts_with(sv5)); 61 assert ( svNot.starts_with(svNot)); 62 } 63 64 #if TEST_STD_VER > 11 65 { 66 typedef std::basic_string_view<char, constexpr_char_traits<char>> SV; 67 constexpr const char *s = "abcde"; 68 constexpr SV sv0 {}; 69 constexpr SV sv1 { s, 1 }; 70 constexpr SV sv2 { s, 2 }; 71 constexpr SV sv3 { s, 3 }; 72 constexpr SV sv4 { s, 4 }; 73 constexpr SV sv5 { s, 5 }; 74 constexpr SV svNot {"def", 3 }; 75 76 static_assert ( sv0.starts_with(sv0), "" ); 77 static_assert (!sv0.starts_with(sv1), "" ); 78 79 static_assert ( sv1.starts_with(sv0), "" ); 80 static_assert ( sv1.starts_with(sv1), "" ); 81 static_assert (!sv1.starts_with(sv2), "" ); 82 static_assert (!sv1.starts_with(sv3), "" ); 83 static_assert (!sv1.starts_with(sv4), "" ); 84 static_assert (!sv1.starts_with(sv5), "" ); 85 static_assert (!sv1.starts_with(svNot), "" ); 86 87 static_assert ( sv2.starts_with(sv0), "" ); 88 static_assert ( sv2.starts_with(sv1), "" ); 89 static_assert ( sv2.starts_with(sv2), "" ); 90 static_assert (!sv2.starts_with(sv3), "" ); 91 static_assert (!sv2.starts_with(sv4), "" ); 92 static_assert (!sv2.starts_with(sv5), "" ); 93 static_assert (!sv2.starts_with(svNot), "" ); 94 95 static_assert ( svNot.starts_with(sv0), "" ); 96 static_assert (!svNot.starts_with(sv1), "" ); 97 static_assert (!svNot.starts_with(sv2), "" ); 98 static_assert (!svNot.starts_with(sv3), "" ); 99 static_assert (!svNot.starts_with(sv4), "" ); 100 static_assert (!svNot.starts_with(sv5), "" ); 101 static_assert ( svNot.starts_with(svNot), "" ); 102 } 103 #endif 104 } 105
