96a509bca2
implement `std::ranges::basic_istream_view` and `std::views::istream`. Although the view itself is constexpr, the constructor argument is a base class std::istream where its ctor/dtor are not constexpr. So no tests are performed in constexpr Differential Revision: https://reviews.llvm.org/D133317
50 lines
1.3 KiB
C++
50 lines
1.3 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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// UNSUPPORTED: no-localization
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// UNSUPPORTED: c++03, c++11, c++14, c++17
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// constexpr default_sentinel_t end() const noexcept;
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#include <cassert>
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#include <ranges>
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#include <sstream>
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#include "test_macros.h"
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#include "utils.h"
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template <class T>
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concept NoexceptEnd =
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requires(T t) {
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{ t.end() } noexcept;
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};
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static_assert(NoexceptEnd<std::ranges::istream_view<int>>);
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static_assert(NoexceptEnd<const std::ranges::istream_view<int>>);
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#ifndef TEST_HAS_NO_WIDE_CHARACTERS
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static_assert(NoexceptEnd<std::ranges::wistream_view<int>>);
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static_assert(NoexceptEnd<const std::ranges::wistream_view<int>>);
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#endif
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template <class CharT>
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void test() {
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auto iss = make_string_stream<CharT>("12");
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std::ranges::basic_istream_view<int, CharT> isv{iss};
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[[maybe_unused]] std::same_as<std::default_sentinel_t> auto sent = isv.end();
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}
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int main(int, char**) {
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test<char>();
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#ifndef TEST_HAS_NO_WIDE_CHARACTERS
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test<wchar_t>();
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#endif
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return 0;
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}
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