105 lines
3.2 KiB
C++
105 lines
3.2 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
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// <string_view>
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// constexpr bool starts_with(string_view x) const noexcept;
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#include <string_view>
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#include <cassert>
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#include "test_macros.h"
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#include "constexpr_char_traits.hpp"
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int main()
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{
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{
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typedef std::string_view SV;
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const char *s = "abcde";
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SV sv0 {};
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SV sv1 { s, 1 };
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SV sv2 { s, 2 };
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// SV sv3 { s, 3 };
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// SV sv4 { s, 4 };
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// SV sv5 { s, 5 };
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SV svNot {"def", 3 };
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LIBCPP_ASSERT_NOEXCEPT(sv0.starts_with(""));
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assert ( sv0.starts_with(""));
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assert (!sv0.starts_with("a"));
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assert ( sv1.starts_with(""));
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assert ( sv1.starts_with("a"));
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assert (!sv1.starts_with("ab"));
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assert (!sv1.starts_with("abc"));
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assert (!sv1.starts_with("abcd"));
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assert (!sv1.starts_with("abcde"));
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assert (!sv1.starts_with("def"));
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assert ( sv2.starts_with(s + 5));
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assert ( sv2.starts_with("a"));
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assert ( sv2.starts_with("ab"));
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assert (!sv2.starts_with("abc"));
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assert (!sv2.starts_with("abcd"));
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assert (!sv2.starts_with("abcde"));
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assert (!sv2.starts_with("def"));
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assert ( svNot.starts_with(""));
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assert (!svNot.starts_with("a"));
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assert (!svNot.starts_with("ab"));
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assert (!svNot.starts_with("abc"));
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assert (!svNot.starts_with("abcd"));
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assert (!svNot.starts_with("abcde"));
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assert ( svNot.starts_with("def"));
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}
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#if TEST_STD_VER > 11
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{
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typedef std::basic_string_view<char, constexpr_char_traits<char>> SV;
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constexpr const char *s = "abcde";
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constexpr SV sv0 {};
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constexpr SV sv1 { s, 1 };
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constexpr SV sv2 { s, 2 };
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// constexpr SV sv3 { s, 3 };
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// constexpr SV sv4 { s, 4 };
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// constexpr SV sv5 { s, 5 };
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constexpr SV svNot {"def", 3 };
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static_assert ( sv0.starts_with(""), "" );
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static_assert (!sv0.starts_with("a"), "" );
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static_assert ( sv1.starts_with(""), "" );
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static_assert ( sv1.starts_with("a"), "" );
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static_assert (!sv1.starts_with("ab"), "" );
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static_assert (!sv1.starts_with("abc"), "" );
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static_assert (!sv1.starts_with("abcd"), "" );
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static_assert (!sv1.starts_with("abcde"), "" );
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static_assert (!sv1.starts_with("def"), "" );
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static_assert ( sv2.starts_with(s + 5), "" );
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static_assert ( sv2.starts_with("a"), "" );
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static_assert ( sv2.starts_with("ab"), "" );
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static_assert (!sv2.starts_with("abc"), "" );
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static_assert (!sv2.starts_with("abcd"), "" );
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static_assert (!sv2.starts_with("abcde"), "" );
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static_assert (!sv2.starts_with("def"), "" );
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static_assert ( svNot.starts_with(""), "" );
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static_assert (!svNot.starts_with("a"), "" );
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static_assert (!svNot.starts_with("ab"), "" );
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static_assert (!svNot.starts_with("abc"), "" );
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static_assert (!svNot.starts_with("abcd"), "" );
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static_assert (!svNot.starts_with("abcde"), "" );
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static_assert ( svNot.starts_with("def"), "" );
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}
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#endif
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}
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