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(charT 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 SV sv1 {}; 26 SV sv2 { "abcde", 5 }; 27 28 ASSERT_NOEXCEPT(sv1.starts_with('e')); 29 30 assert (!sv1.starts_with('a')); 31 assert (!sv1.starts_with('x')); 32 assert ( sv2.starts_with('a')); 33 assert (!sv2.starts_with('x')); 34 } 35 36 #if TEST_STD_VER > 11 37 { 38 typedef std::basic_string_view<char, constexpr_char_traits<char>> SV; 39 constexpr SV sv1 {}; 40 constexpr SV sv2 { "abcde", 5 }; 41 static_assert (!sv1.starts_with('a'), "" ); 42 static_assert (!sv1.starts_with('x'), "" ); 43 static_assert ( sv2.starts_with('a'), "" ); 44 static_assert (!sv2.starts_with('x'), "" ); 45 } 46 #endif 47 } 48
