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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 // <ios>
11 
12 // class ios_base
13 
14 // ios_base& hex(ios_base& str);
15 
16 #include <ios>
17 #include <streambuf>
18 #include <cassert>
19 
20 struct testbuf : public std::streambuf {};
21 
main()22 int main()
23 {
24     testbuf sb;
25     std::ios ios(&sb);
26     std::ios_base& r = std::hex(ios);
27     assert(&r == &ios);
28     assert(ios.flags() & std::ios::hex);
29 }
30