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 // UNSUPPORTED: c++98, c++03, c++11, c++14
11
12 // <fstream>
13
14 // template <class charT, class traits = char_traits<charT> >
15 // class basic_ifstream
16
17 // explicit basic_ifstream(const filesystem::path& s,
18 // ios_base::openmode mode = ios_base::in);
19
20 #include <fstream>
21 #include <filesystem>
22 #include <cassert>
23
24 namespace fs = std::filesystem;
25
main()26 int main() {
27 {
28 fs::path p;
29 static_assert(!std::is_convertible<fs::path, std::ifstream>::value,
30 "ctor should be explicit");
31 static_assert(std::is_constructible<std::ifstream, fs::path const&,
32 std::ios_base::openmode>::value,
33 "");
34 }
35 {
36 std::ifstream fs(fs::path("test.dat"));
37 double x = 0;
38 fs >> x;
39 assert(x == 3.25);
40 }
41 // std::ifstream(const fs::path&, std::ios_base::openmode) is tested in
42 // test/std/input.output/file.streams/fstreams/ofstream.cons/string.pass.cpp
43 // which creates writable files.
44 {
45 std::wifstream fs(fs::path("test.dat"));
46 double x = 0;
47 fs >> x;
48 assert(x == 3.25);
49 }
50 // std::wifstream(const fs::path&, std::ios_base::openmode) is tested in
51 // test/std/input.output/file.streams/fstreams/ofstream.cons/string.pass.cpp
52 // which creates writable files.
53 }
54