libcxx/test/std/input.output/iostream.format/input.streams/istream/istream.assign/member_swap.pass.cpp

   1 //===----------------------------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 // <istream>
  10
  11 // template <class charT, class traits = char_traits<charT> >
  12 // class basic_istream;
  13
  14 // void swap(basic_istream& rhs);
  15
  16 #include <istream>
  17 #include <cassert>
  18
  19 #include "test_macros.h"
  20
  21 template <class CharT>
  22 struct testbuf
  23     : public std::basic_streambuf<CharT>
  24 {
  25     testbuf() {}
  26 };
  27
  28 template <class CharT>
  29 struct test_istream
  30     : public std::basic_istream<CharT>
  31 {
  32     typedef std::basic_istream<CharT> base;
  33     test_istream(testbuf<CharT>* sb) : base(sb) {}
  34
  35     void swap(test_istream& s) {base::swap(s);}
  36 };
  37
  38 int main(int, char**)
  39 {
  40     {
  41         testbuf<char> sb1;
  42         testbuf<char> sb2;
  43         test_istream<char> is1(&sb1);
  44         test_istream<char> is2(&sb2);
  45         is1.swap(is2);
  46         assert(is1.rdbuf() == &sb1);
  47         assert(is1.tie() == 0);
  48         assert(is1.fill() == ' ');
  49         assert(is1.rdstate() == is1.goodbit);
  50         assert(is1.exceptions() == is1.goodbit);
  51         assert(is1.flags() == (is1.skipws | is1.dec));
  52         assert(is1.precision() == 6);
  53         assert(is1.getloc().name() == "C");
  54         assert(is2.rdbuf() == &sb2);
  55         assert(is2.tie() == 0);
  56         assert(is2.fill() == ' ');
  57         assert(is2.rdstate() == is2.goodbit);
  58         assert(is2.exceptions() == is2.goodbit);
  59         assert(is2.flags() == (is2.skipws | is2.dec));
  60         assert(is2.precision() == 6);
  61         assert(is2.getloc().name() == "C");
  62     }
  63 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
  64     {
  65         testbuf<wchar_t> sb1;
  66         testbuf<wchar_t> sb2;
  67         test_istream<wchar_t> is1(&sb1);
  68         test_istream<wchar_t> is2(&sb2);
  69         is1.swap(is2);
  70         assert(is1.rdbuf() == &sb1);
  71         assert(is1.tie() == 0);
  72         assert(is1.fill() == ' ');
  73         assert(is1.rdstate() == is1.goodbit);
  74         assert(is1.exceptions() == is1.goodbit);
  75         assert(is1.flags() == (is1.skipws | is1.dec));
  76         assert(is1.precision() == 6);
  77         assert(is1.getloc().name() == "C");
  78         assert(is2.rdbuf() == &sb2);
  79         assert(is2.tie() == 0);
  80         assert(is2.fill() == ' ');
  81         assert(is2.rdstate() == is2.goodbit);
  82         assert(is2.exceptions() == is2.goodbit);
  83         assert(is2.flags() == (is2.skipws | is2.dec));
  84         assert(is2.precision() == 6);
  85         assert(is2.getloc().name() == "C");
  86     }
  87 #endif
  88
  89   return 0;
  90 }