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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: no-localization
// UNSUPPORTED: c++03, c++11, c++14, c++17
// concept checking istream_view
#include <istream>
#include <ranges>
#include "test_macros.h"
template <class Val, class CharT, class Traits = std::char_traits<CharT>>
concept HasIstreamView = requires { typename std::ranges::basic_istream_view<Val, CharT, Traits>; };
static_assert(HasIstreamView<int, char>);
#ifndef TEST_HAS_NO_WIDE_CHARACTERS
static_assert(HasIstreamView<int, wchar_t>);
#endif
// Unmovable Val
struct Unmovable {
Unmovable() = default;
Unmovable(Unmovable&&) = delete;
template <class CharT>
friend std::basic_istream<CharT>& operator>>(std::basic_istream<CharT>& x, const Unmovable&) {
return x;
}
};
static_assert(!HasIstreamView<Unmovable, char>);
#ifndef TEST_HAS_NO_WIDE_CHARACTERS
static_assert(!HasIstreamView<Unmovable, wchar_t>);
#endif
// !default_initializable<Val>
struct NoDefaultCtor {
NoDefaultCtor(int) {}
friend std::istream& operator>>(std::istream& x, const NoDefaultCtor&) { return x; }
};
static_assert(!HasIstreamView<NoDefaultCtor, char>);
#ifndef TEST_HAS_NO_WIDE_CHARACTERS
static_assert(!HasIstreamView<NoDefaultCtor, wchar_t>);
#endif
// !stream-extractable<Val, CharT, Traits>
struct Foo {};
static_assert(!HasIstreamView<Foo, char>);
#ifndef TEST_HAS_NO_WIDE_CHARACTERS
static_assert(!HasIstreamView<Foo, wchar_t>);
#endif
template <class T>
concept OnlyInputRange = std::ranges::input_range<T> && !std::ranges::forward_range<T>;
static_assert(OnlyInputRange<std::ranges::istream_view<int>>);
static_assert(OnlyInputRange<std::ranges::istream_view<long>>);
static_assert(OnlyInputRange<std::ranges::istream_view<double>>);
static_assert(OnlyInputRange<std::ranges::istream_view<char>>);
#ifndef TEST_HAS_NO_WIDE_CHARACTERS
static_assert(OnlyInputRange<std::ranges::wistream_view<int>>);
static_assert(OnlyInputRange<std::ranges::wistream_view<long>>);
static_assert(OnlyInputRange<std::ranges::wistream_view<double>>);
static_assert(OnlyInputRange<std::ranges::wistream_view<wchar_t>>);
#endif
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