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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: c++03, c++11, c++14
// UNSUPPORTED: availability-filesystem-missing
// FILE_DEPENDENCIES: test.dat
// <fstream>
// template <class charT, class traits = char_traits<charT> >
// class basic_ifstream
// template<class T>
// explicit basic_ifstream(const T& s, ios_base::openmode mode = ios_base::in); // Since C++17
// Constraints: is_same_v<T, filesystem::path> is true
#include <cassert>
#include <filesystem>
#include <fstream>
#include <type_traits>
#include "test_macros.h"
#include "test_iterators.h"
namespace fs = std::filesystem;
template <class CharT>
constexpr bool test_non_convert_to_path() {
// String types
static_assert(!std::is_constructible_v<std::ifstream, std::basic_string_view<CharT>>);
static_assert(!std::is_constructible_v<std::ifstream, const std::basic_string_view<CharT>>);
// Char* pointers
if constexpr (!std::is_same_v<CharT, char> && !std::is_same_v<CharT, fs::path::value_type>)
static_assert(!std::is_constructible_v<std::ifstream, const CharT*>);
// Iterators
static_assert(!std::is_convertible_v<std::ifstream, cpp17_input_iterator<const CharT*>>);
return true;
}
static_assert(test_non_convert_to_path<char>());
#if !defined(TEST_HAS_NO_WIDE_CHARACTERS) && !defined(TEST_HAS_OPEN_WITH_WCHAR)
static_assert(test_non_convert_to_path<wchar_t>());
#endif // !TEST_HAS_NO_WIDE_CHARACTERS && !TEST_HAS_OPEN_WITH_WCHAR
#ifndef TEST_HAS_NO_CHAR8_T
static_assert(test_non_convert_to_path<char8_t>());
#endif // TEST_HAS_NO_CHAR8_T
static_assert(test_non_convert_to_path<char16_t>());
static_assert(test_non_convert_to_path<char32_t>());
int main(int, char**) {
{
fs::path p;
static_assert(!std::is_convertible<fs::path, std::ifstream>::value,
"ctor should be explicit");
static_assert(std::is_constructible<std::ifstream, fs::path const&,
std::ios_base::openmode>::value,
"");
}
{
std::ifstream fs(fs::path("test.dat"));
double x = 0;
fs >> x;
assert(x == 3.25);
}
// std::ifstream(const fs::path&, std::ios_base::openmode) is tested in
// test/std/input.output/file.streams/fstreams/ofstream.cons/string.pass.cpp
// which creates writable files.
#ifndef TEST_HAS_NO_WIDE_CHARACTERS
{
std::wifstream fs(fs::path("test.dat"));
double x = 0;
fs >> x;
assert(x == 3.25);
}
// std::wifstream(const fs::path&, std::ios_base::openmode) is tested in
// test/std/input.output/file.streams/fstreams/ofstream.cons/string.pass.cpp
// which creates writable files.
#endif
return 0;
}
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