| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17 |
| |
| // <string_view> |
| |
| // constexpr bool starts_with(string_view x) const noexcept; |
| |
| #include <string_view> |
| #include <cassert> |
| |
| #include "test_macros.h" |
| #include "constexpr_char_traits.h" |
| |
| int main(int, char**) |
| { |
| { |
| typedef std::string_view SV; |
| const char *s = "abcde"; |
| SV sv0 {}; |
| SV sv1 { s, 1 }; |
| SV sv2 { s, 2 }; |
| // SV sv3 { s, 3 }; |
| // SV sv4 { s, 4 }; |
| // SV sv5 { s, 5 }; |
| SV svNot {"def", 3 }; |
| |
| LIBCPP_ASSERT_NOEXCEPT(sv0.starts_with("")); |
| |
| assert ( sv0.starts_with("")); |
| assert (!sv0.starts_with("a")); |
| |
| assert ( sv1.starts_with("")); |
| assert ( sv1.starts_with("a")); |
| assert (!sv1.starts_with("ab")); |
| assert (!sv1.starts_with("abc")); |
| assert (!sv1.starts_with("abcd")); |
| assert (!sv1.starts_with("abcde")); |
| assert (!sv1.starts_with("def")); |
| |
| assert ( sv2.starts_with(s + 5)); |
| assert ( sv2.starts_with("a")); |
| assert ( sv2.starts_with("ab")); |
| assert (!sv2.starts_with("abc")); |
| assert (!sv2.starts_with("abcd")); |
| assert (!sv2.starts_with("abcde")); |
| assert (!sv2.starts_with("def")); |
| |
| assert ( svNot.starts_with("")); |
| assert (!svNot.starts_with("a")); |
| assert (!svNot.starts_with("ab")); |
| assert (!svNot.starts_with("abc")); |
| assert (!svNot.starts_with("abcd")); |
| assert (!svNot.starts_with("abcde")); |
| assert ( svNot.starts_with("def")); |
| } |
| |
| #if TEST_STD_VER > 11 |
| { |
| typedef std::basic_string_view<char, constexpr_char_traits<char>> SV; |
| constexpr const char *s = "abcde"; |
| constexpr SV sv0 {}; |
| constexpr SV sv1 { s, 1 }; |
| constexpr SV sv2 { s, 2 }; |
| // constexpr SV sv3 { s, 3 }; |
| // constexpr SV sv4 { s, 4 }; |
| // constexpr SV sv5 { s, 5 }; |
| constexpr SV svNot {"def", 3 }; |
| |
| static_assert ( sv0.starts_with(""), "" ); |
| static_assert (!sv0.starts_with("a"), "" ); |
| |
| static_assert ( sv1.starts_with(""), "" ); |
| static_assert ( sv1.starts_with("a"), "" ); |
| static_assert (!sv1.starts_with("ab"), "" ); |
| static_assert (!sv1.starts_with("abc"), "" ); |
| static_assert (!sv1.starts_with("abcd"), "" ); |
| static_assert (!sv1.starts_with("abcde"), "" ); |
| static_assert (!sv1.starts_with("def"), "" ); |
| |
| static_assert ( sv2.starts_with(s + 5), "" ); |
| static_assert ( sv2.starts_with("a"), "" ); |
| static_assert ( sv2.starts_with("ab"), "" ); |
| static_assert (!sv2.starts_with("abc"), "" ); |
| static_assert (!sv2.starts_with("abcd"), "" ); |
| static_assert (!sv2.starts_with("abcde"), "" ); |
| static_assert (!sv2.starts_with("def"), "" ); |
| |
| static_assert ( svNot.starts_with(""), "" ); |
| static_assert (!svNot.starts_with("a"), "" ); |
| static_assert (!svNot.starts_with("ab"), "" ); |
| static_assert (!svNot.starts_with("abc"), "" ); |
| static_assert (!svNot.starts_with("abcd"), "" ); |
| static_assert (!svNot.starts_with("abcde"), "" ); |
| static_assert ( svNot.starts_with("def"), "" ); |
| } |
| #endif |
| |
| return 0; |
| } |