97 lines
3.3 KiB
C++
97 lines
3.3 KiB
C++
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//===----------------------------------------------------------------------===//
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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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// UNSUPPORTED: c++03, c++11, c++14, c++17
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// <string_view>
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// template<class charT, class traits>
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// constexpr auto operator<=>(basic_string_view<charT, traits> lhs, basic_string_view<charT, traits> rhs);
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//
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// LWG 3432
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// [string.view]/4
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// Mandates: R denotes a comparison category type ([cmp.categories]).
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#include <string_view>
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#include "test_macros.h"
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template <class CharT, class Ordering>
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struct traits {
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typedef CharT char_type;
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typedef int int_type;
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typedef std::streamoff off_type;
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typedef std::streampos pos_type;
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typedef std::mbstate_t state_type;
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using comparison_category = Ordering;
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static constexpr void assign(char_type&, const char_type&) noexcept;
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static constexpr bool eq(char_type&, const char_type&) noexcept;
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static constexpr bool lt(char_type&, const char_type&) noexcept;
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static constexpr int compare(const char_type*, const char_type*, std::size_t) { return 0; }
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static constexpr std::size_t length(const char_type*);
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static constexpr const char_type* find(const char_type*, std::size_t, const char_type&);
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static constexpr char_type* move(char_type*, const char_type*, std::size_t);
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static constexpr char_type* copy(char_type*, const char_type*, std::size_t);
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static constexpr char_type* assign(char_type*, std::size_t, char_type);
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static constexpr int_type not_eof(int_type) noexcept;
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static constexpr char_type to_char_type(int_type) noexcept;
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static constexpr int_type to_int_type(char_type) noexcept;
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static constexpr bool eq_int_type(int_type, int_type) noexcept;
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static constexpr int_type eof() noexcept;
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};
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template <class CharT, class Ordering, bool Valid>
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void test() {
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using type = std::basic_string_view<CharT, traits<CharT, Ordering>>;
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if constexpr (Valid)
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type{} <=> type{};
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else
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#ifndef TEST_HAS_NO_WIDE_CHARACTERS
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// These diagnostics are issued for
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// - Every invalid ordering
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// - Every type
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// expected-error-re@string_view:* 15 {{static assertion failed{{.*}}return type is not a comparison category type}}
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// This diagnostic is not issued for Ordering == void.
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// expected-error@string_view:* 10 {{no matching conversion for static_cast from}}
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#else
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// One less test run when wchar_t is unavailable.
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// expected-error-re@string_view:* 12 {{static assertion failed{{.*}}return type is not a comparison category type}}
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// expected-error@string_view:* 8 {{no matching conversion for static_cast from}}
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#endif
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type{} <=> type{};
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}
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template <class CharT>
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void test_all_orders() {
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test<CharT, std::strong_ordering, true>();
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test<CharT, std::weak_ordering, true>();
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test<CharT, std::partial_ordering, true>();
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test<CharT, void, false>();
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test<CharT, int, false>();
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test<CharT, float, false>();
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}
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void test_all_types() {
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test_all_orders<char>();
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#ifndef TEST_HAS_NO_WIDE_CHARACTERS
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test_all_orders<wchar_t>();
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#endif
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test_all_orders<char8_t>();
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test_all_orders<char16_t>();
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test_all_orders<char32_t>();
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}
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