4761e74a27
Implement [LWG3430](https://wg21.link/LWG3430). --------- Signed-off-by: yronglin <yronglin777@gmail.com>
90 lines
2.5 KiB
C++
90 lines
2.5 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: c++03, c++11, c++14
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// UNSUPPORTED: availability-filesystem-missing
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// <fstream>
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// plate <class charT, class traits = char_traits<charT> >
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// class basic_fstream
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// template<class T>
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// explicit basic_fstream(const T& s, ios_base::openmode mode = ios_base::in); // Since C++17
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// Constraints: is_same_v<T, filesystem::path> is true
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#include <fstream>
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#include <filesystem>
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#include <cassert>
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#include <type_traits>
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#include "test_macros.h"
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#include "test_iterators.h"
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#include "platform_support.h"
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namespace fs = std::filesystem;
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template <class CharT>
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constexpr bool test_non_convert_to_path() {
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// String types
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static_assert(!std::is_constructible_v<std::fstream, std::basic_string_view<CharT>>);
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static_assert(!std::is_constructible_v<std::fstream, const std::basic_string_view<CharT>>);
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// Char* pointers
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if constexpr (!std::is_same_v<CharT, char>)
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static_assert(!std::is_constructible_v<std::fstream, const CharT*>);
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// Iterators
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static_assert(!std::is_convertible_v<std::fstream, cpp17_input_iterator<const CharT*>>);
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return true;
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}
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static_assert(test_non_convert_to_path<char>());
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#if !defined(TEST_HAS_NO_WIDE_CHARACTERS) && !defined(TEST_HAS_OPEN_WITH_WCHAR)
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static_assert(test_non_convert_to_path<wchar_t>());
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#endif // !TEST_HAS_NO_WIDE_CHARACTERS && !TEST_HAS_OPEN_WITH_WCHAR
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#ifndef TEST_HAS_NO_CHAR8_T
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static_assert(test_non_convert_to_path<char8_t>());
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#endif // TEST_HAS_NO_CHAR8_T
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static_assert(test_non_convert_to_path<char16_t>());
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static_assert(test_non_convert_to_path<char32_t>());
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int main(int, char**) {
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fs::path p = get_temp_file_name();
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{
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std::fstream fs(p, std::ios_base::in | std::ios_base::out |
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std::ios_base::trunc);
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double x = 0;
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fs << 3.25;
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fs.seekg(0);
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fs >> x;
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assert(x == 3.25);
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}
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std::remove(p.string().c_str());
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#ifndef TEST_HAS_NO_WIDE_CHARACTERS
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{
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std::wfstream fs(p, std::ios_base::in | std::ios_base::out |
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std::ios_base::trunc);
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double x = 0;
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fs << 3.25;
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fs.seekg(0);
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fs >> x;
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assert(x == 3.25);
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}
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std::remove(p.string().c_str());
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#endif
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return 0;
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}
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