| 1 | //===----------------------------------------------------------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | // UNSUPPORTED: no-localization |
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| 10 | // UNSUPPORTED: c++03, c++11, c++14, c++17 |
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| 11 | |
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| 12 | // concept checking istream_view |
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| 13 | |
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| 14 | #include <istream> |
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| 15 | #include <ranges> |
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| 16 | |
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| 17 | #include "test_macros.h" |
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| 18 | |
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| 19 | template <class Val, class CharT, class Traits = std::char_traits<CharT>> |
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| 20 | concept HasIstreamView = requires { typename std::ranges::basic_istream_view<Val, CharT, Traits>; }; |
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| 21 | |
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| 22 | static_assert(HasIstreamView<int, char>); |
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| 23 | |
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| 24 | #ifndef TEST_HAS_NO_WIDE_CHARACTERS |
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| 25 | static_assert(HasIstreamView<int, wchar_t>); |
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| 26 | #endif |
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| 27 | |
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| 28 | // Unmovable Val |
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| 29 | struct Unmovable { |
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| 30 | Unmovable() = default; |
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| 31 | Unmovable(Unmovable&&) = delete; |
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| 32 | template <class CharT> |
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| 33 | friend std::basic_istream<CharT>& operator>>(std::basic_istream<CharT>& x, const Unmovable&) { |
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| 34 | return x; |
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| 35 | } |
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| 36 | }; |
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| 37 | static_assert(!HasIstreamView<Unmovable, char>); |
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| 38 | |
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| 39 | #ifndef TEST_HAS_NO_WIDE_CHARACTERS |
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| 40 | static_assert(!HasIstreamView<Unmovable, wchar_t>); |
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| 41 | #endif |
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| 42 | |
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| 43 | // !default_initializable<Val> |
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| 44 | struct NoDefaultCtor { |
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| 45 | NoDefaultCtor(int) {} |
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| 46 | friend std::istream& operator>>(std::istream& x, const NoDefaultCtor&) { return x; } |
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| 47 | }; |
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| 48 | static_assert(!HasIstreamView<NoDefaultCtor, char>); |
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| 49 | #ifndef TEST_HAS_NO_WIDE_CHARACTERS |
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| 50 | static_assert(!HasIstreamView<NoDefaultCtor, wchar_t>); |
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| 51 | #endif |
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| 52 | |
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| 53 | // !stream-extractable<Val, CharT, Traits> |
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| 54 | struct Foo {}; |
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| 55 | static_assert(!HasIstreamView<Foo, char>); |
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| 56 | #ifndef TEST_HAS_NO_WIDE_CHARACTERS |
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| 57 | static_assert(!HasIstreamView<Foo, wchar_t>); |
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| 58 | #endif |
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| 59 | |
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| 60 | template <class T> |
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| 61 | concept OnlyInputRange = std::ranges::input_range<T> && !std::ranges::forward_range<T>; |
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| 62 | |
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| 63 | static_assert(OnlyInputRange<std::ranges::istream_view<int>>); |
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| 64 | static_assert(OnlyInputRange<std::ranges::istream_view<long>>); |
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| 65 | static_assert(OnlyInputRange<std::ranges::istream_view<double>>); |
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| 66 | static_assert(OnlyInputRange<std::ranges::istream_view<char>>); |
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| 67 | |
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| 68 | #ifndef TEST_HAS_NO_WIDE_CHARACTERS |
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| 69 | static_assert(OnlyInputRange<std::ranges::wistream_view<int>>); |
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| 70 | static_assert(OnlyInputRange<std::ranges::wistream_view<long>>); |
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| 71 | static_assert(OnlyInputRange<std::ranges::wistream_view<double>>); |
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| 72 | static_assert(OnlyInputRange<std::ranges::wistream_view<wchar_t>>); |
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| 73 | #endif |
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| 74 | |
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