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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 // <istream>
     11 
     12 // template <class charT, class traits = char_traits<charT> >
     13 // class basic_istream;
     14 
     15 // basic_istream& operator=(basic_istream&& rhs);
     16 
     17 #include <istream>
     18 #include <cassert>
     19 
     20 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
     21 
     22 template <class CharT>
     23 struct testbuf
     24     : public std::basic_streambuf<CharT>
     25 {
     26     testbuf() {}
     27 };
     28 
     29 template <class CharT>
     30 struct test_istream
     31     : public std::basic_istream<CharT>
     32 {
     33     typedef std::basic_istream<CharT> base;
     34     test_istream(testbuf<CharT>* sb) : base(sb) {}
     35 
     36     test_istream& operator=(test_istream&& s)
     37         {base::operator=(std::move(s)); return *this;}
     38 };
     39 
     40 #endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
     41 
     42 int main()
     43 {
     44 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
     45     {
     46         testbuf<char> sb1;
     47         testbuf<char> sb2;
     48         test_istream<char> is1(&sb1);
     49         test_istream<char> is2(&sb2);
     50         is2 = (std::move(is1));
     51         assert(is1.rdbuf() == &sb1);
     52         assert(is1.tie() == 0);
     53         assert(is1.fill() == ' ');
     54         assert(is1.rdstate() == is1.goodbit);
     55         assert(is1.exceptions() == is1.goodbit);
     56         assert(is1.flags() == (is1.skipws | is1.dec));
     57         assert(is1.precision() == 6);
     58         assert(is1.getloc().name() == "C");
     59         assert(is2.rdbuf() == &sb2);
     60         assert(is2.tie() == 0);
     61         assert(is2.fill() == ' ');
     62         assert(is2.rdstate() == is2.goodbit);
     63         assert(is2.exceptions() == is2.goodbit);
     64         assert(is2.flags() == (is2.skipws | is2.dec));
     65         assert(is2.precision() == 6);
     66         assert(is2.getloc().name() == "C");
     67     }
     68     {
     69         testbuf<wchar_t> sb1;
     70         testbuf<wchar_t> sb2;
     71         test_istream<wchar_t> is1(&sb1);
     72         test_istream<wchar_t> is2(&sb2);
     73         is2 = (std::move(is1));
     74         assert(is1.rdbuf() == &sb1);
     75         assert(is1.tie() == 0);
     76         assert(is1.fill() == ' ');
     77         assert(is1.rdstate() == is1.goodbit);
     78         assert(is1.exceptions() == is1.goodbit);
     79         assert(is1.flags() == (is1.skipws | is1.dec));
     80         assert(is1.precision() == 6);
     81         assert(is1.getloc().name() == "C");
     82         assert(is2.rdbuf() == &sb2);
     83         assert(is2.tie() == 0);
     84         assert(is2.fill() == ' ');
     85         assert(is2.rdstate() == is2.goodbit);
     86         assert(is2.exceptions() == is2.goodbit);
     87         assert(is2.flags() == (is2.skipws | is2.dec));
     88         assert(is2.precision() == 6);
     89         assert(is2.getloc().name() == "C");
     90     }
     91 #endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
     92 }
     93