113 lines
3.1 KiB
C++
113 lines
3.1 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// <string_view>
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// constexpr const_iterator rend() const;
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#include <string_view>
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#include <cassert>
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#include <cstddef>
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#include "test_macros.h"
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template <class S>
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void
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test(S s)
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{
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const S& cs = s;
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typename S::reverse_iterator e = s.rend();
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typename S::const_reverse_iterator ce1 = cs.rend();
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typename S::const_reverse_iterator ce2 = s.crend();
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if (s.empty())
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{
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assert( e == s.rbegin());
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assert(ce1 == cs.rbegin());
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assert(ce2 == s.rbegin());
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}
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else
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{
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assert( e != s.rbegin());
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assert(ce1 != cs.rbegin());
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assert(ce2 != s.rbegin());
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}
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assert(static_cast<std::size_t>( e - s.rbegin()) == s.size());
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assert(static_cast<std::size_t>(ce1 - cs.rbegin()) == cs.size());
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assert(static_cast<std::size_t>(ce2 - s.crbegin()) == s.size());
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assert( e == ce1);
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assert( e == ce2);
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assert(ce1 == ce2);
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}
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int main(int, char**)
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{
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typedef std::string_view string_view;
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#if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
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typedef std::u8string_view u8string_view;
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#endif
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typedef std::u16string_view u16string_view;
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typedef std::u32string_view u32string_view;
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test(string_view ());
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test(u16string_view());
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test(u32string_view());
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test(string_view ( "123"));
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#if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
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test(u8string_view{u8"123"});
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#endif
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#if TEST_STD_VER >= 11
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test(u16string_view{u"123"});
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test(u32string_view{U"123"});
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#endif
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#ifndef TEST_HAS_NO_WIDE_CHARACTERS
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typedef std::wstring_view wstring_view;
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test(wstring_view ());
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test(wstring_view (L"123"));
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#endif
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#if TEST_STD_VER > 14
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{
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constexpr string_view sv { "123", 3 };
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#if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
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constexpr u8string_view u8sv {u8"123", 3 };
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#endif
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constexpr u16string_view u16sv {u"123", 3 };
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constexpr u32string_view u32sv {U"123", 3 };
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static_assert ( *--sv.rend() == sv[0], "" );
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#if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
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static_assert ( *--u8sv.rend() == u8sv[0], "" );
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#endif
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static_assert ( *--u16sv.rend() == u16sv[0], "" );
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static_assert ( *--u32sv.rend() == u32sv[0], "" );
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static_assert ( *--sv.crend() == sv[0], "" );
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#if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
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static_assert ( *--u8sv.crend() == u8sv[0], "" );
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#endif
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static_assert ( *--u16sv.crend() == u16sv[0], "" );
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static_assert ( *--u32sv.crend() == u32sv[0], "" );
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#ifndef TEST_HAS_NO_WIDE_CHARACTERS
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{
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constexpr wstring_view wsv {L"123", 3 };
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static_assert ( *--wsv.rend() == wsv[0], "" );
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static_assert ( *--wsv.crend() == wsv[0], "" );
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}
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#endif
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}
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#endif // TEST_STD_VER > 14
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return 0;
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}
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