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
43 lines
1.3 KiB
C++
43 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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// Some basic examples of how istream_view might be used in the wild. This is a general
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// collection of sample algorithms and functions that try to mock general usage of
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// this view.
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#include <algorithm>
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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 CharT>
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void test() {
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auto ints = make_string_stream<CharT>("0 1 2 3 4");
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auto oss = std::basic_ostringstream<CharT>{};
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auto delimiter = make_string<CharT>("-");
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std::ranges::copy(
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std::ranges::basic_istream_view<int, CharT>(ints), std::ostream_iterator<int, CharT>{oss, delimiter.c_str()});
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auto expected = make_string<CharT>("0-1-2-3-4-");
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assert(oss.str() == expected);
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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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