1 //===----------------------------------------------------------------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is dual licensed under the MIT and the University of Illinois Open 6 // Source Licenses. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 // <fstream> 11 12 // template <class charT, class traits = char_traits<charT> > 13 // class basic_ifstream 14 15 // void open(const string& s, ios_base::openmode mode = ios_base::in); 16 17 #include <fstream> 18 #include <cassert> 19 20 int main() 21 { 22 { 23 std::ifstream fs; 24 assert(!fs.is_open()); 25 char c = 'a'; 26 fs >> c; 27 assert(fs.fail()); 28 assert(c == 'a'); 29 fs.open(std::string("test.dat")); 30 assert(fs.is_open()); 31 fs >> c; 32 assert(c == 'r'); 33 } 34 { 35 std::wifstream fs; 36 assert(!fs.is_open()); 37 wchar_t c = L'a'; 38 fs >> c; 39 assert(fs.fail()); 40 assert(c == L'a'); 41 fs.open(std::string("test.dat")); 42 assert(fs.is_open()); 43 fs >> c; 44 assert(c == L'r'); 45 } 46 } 47
