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