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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
//
//===----------------------------------------------------------------------===//
#ifndef TEST_STD_INPUT_OUTPUT_FILE_STREAMS_FSTREAMS_TEST_HELPERS_H
#define TEST_STD_INPUT_OUTPUT_FILE_STREAMS_FSTREAMS_TEST_HELPERS_H
#include <cassert>
#include <concepts>
#include <cstdio>
#include <fstream>
#include <filesystem>
#include <type_traits>
#include <utility>
#if defined(_WIN32)
# include <io.h>
# include <windows.h>
#else
# include <fcntl.h>
#endif
#include "platform_support.h"
#include "types.h"
#if TEST_STD_VER >= 26
inline bool is_handle_valid(NativeHandleT handle) {
# if defined(_WIN32)
BY_HANDLE_FILE_INFORMATION fileInformation;
return GetFileInformationByHandle(handle, &fileInformation);
# elif __has_include(<unistd.h>) // POSIX
return fcntl(handle, F_GETFL) != -1 || errno != EBADF;
# else
# error "Provide a native file handle!"
# endif
}
template <typename CharT, typename StreamT>
inline void test_native_handle() {
static_assert(
std::is_same_v<typename std::basic_filebuf<CharT>::native_handle_type, typename StreamT::native_handle_type>);
StreamT f;
std::filesystem::path p = get_temp_file_name();
// non-const
{
f.open(p);
std::same_as<NativeHandleT> decltype(auto) handle = f.native_handle();
assert(is_handle_valid(handle));
assert(f.rdbuf()->native_handle() == handle);
assert(std::as_const(f).rdbuf()->native_handle() == handle);
f.close();
assert(!is_handle_valid(handle));
static_assert(noexcept(f.native_handle()));
}
// const
{
f.open(p);
std::same_as<NativeHandleT> decltype(auto) const_handle = std::as_const(f).native_handle();
assert(is_handle_valid(const_handle));
assert(f.rdbuf()->native_handle() == const_handle);
assert(std::as_const(f).rdbuf()->native_handle() == const_handle);
f.close();
assert(!is_handle_valid(const_handle));
static_assert(noexcept(std::as_const(f).native_handle()));
}
}
template <typename StreamT>
inline void test_native_handle_type() {
static_assert(std::is_trivially_copyable_v<typename StreamT::native_handle_type>);
static_assert(std::semiregular<typename StreamT::native_handle_type>);
static_assert(std::is_same_v<typename StreamT::native_handle_type, NativeHandleT>);
}
#endif // #if TEST_STD_VER >= 26
#endif // TEST_STD_INPUT_OUTPUT_FILE_STREAMS_FSTREAMS_TEST_HELPERS_H
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