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-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 // FILE_DEPENDENCIES: test.dat 10 11 // <fstream> 12 13 // template <class charT, class traits = char_traits<charT> > 14 // class basic_ifstream 15 16 // void open(const string& s, ios_base::openmode mode = ios_base::in); 17 18 #include <fstream> 19 #include <cassert> 20 21 #include "test_macros.h" 22 main(int,char **)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(std::string("test.dat")); 33 assert(fs.is_open()); 34 fs >> c; 35 assert(c == 'r'); 36 } 37 #ifndef TEST_HAS_NO_WIDE_CHARACTERS 38 { 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(std::string("test.dat")); 46 assert(fs.is_open()); 47 fs >> c; 48 assert(c == L'r'); 49 } 50 #endif 51 52 return 0; 53 } 54