54 lines · cpp
1//===----------------------------------------------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9// FILE_DEPENDENCIES: test.dat10 11// <fstream>12 13// template <class charT, class traits = char_traits<charT> >14// class basic_ifstream15 16// void open(const char* s, ios_base::openmode mode = ios_base::in);17 18#include <fstream>19#include <cassert>20 21#include "test_macros.h"22 23int main(int, char**)24{25 {26 std::ifstream fs;27 assert(!fs.is_open());28 char c = 'a';29 fs >> c;30 assert(fs.fail());31 assert(c == 'a');32 fs.open("test.dat");33 assert(fs.is_open());34 fs >> c;35 assert(c == 'r');36 }37#ifndef TEST_HAS_NO_WIDE_CHARACTERS38 {39 std::wifstream fs;40 assert(!fs.is_open());41 wchar_t c = L'a';42 fs >> c;43 assert(fs.fail());44 assert(c == L'a');45 fs.open("test.dat");46 assert(fs.is_open());47 fs >> c;48 assert(c == L'r');49 }50#endif51 52 return 0;53}54