49 lines · cpp
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-exception6//7//===----------------------------------------------------------------------===//8 9// UNSUPPORTED: c++03, c++11, c++14, c++1710 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.h"20 21int main(int, char**) {22 {23 typedef std::string_view SV;24 SV sv1{};25 SV sv2{"abcde", 5};26 27 ASSERT_NOEXCEPT(sv1.starts_with('e'));28 29 assert(!sv1.starts_with('a'));30 assert(!sv1.starts_with('x'));31 assert(sv2.starts_with('a'));32 assert(!sv2.starts_with('x'));33 }34 35#if TEST_STD_VER > 1136 {37 typedef std::basic_string_view<char, constexpr_char_traits<char>> SV;38 constexpr SV sv1{};39 constexpr SV sv2{"abcde", 5};40 static_assert(!sv1.starts_with('a'), "");41 static_assert(!sv1.starts_with('x'), "");42 static_assert(sv2.starts_with('a'), "");43 static_assert(!sv2.starts_with('x'), "");44 }45#endif46 47 return 0;48}49