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 char* s, ios_base::openmode mode = ios_base::in);
16
17#include <fstream>
18#include <cassert>
19
20int 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("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("test.dat");
42        assert(fs.is_open());
43        fs >> c;
44        assert(c == L'r');
45    }
46}
47