libstdc++-v3/testsuite/27_io/rvalue_streams-2.cc

   1 // { dg-do compile { target c++11 } }
   2
   3 // Copyright (C) 2015-2019 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 3, or (at your option)
   9 // any later version.
  10
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15
  16 // You should have received a copy of the GNU General Public License along
  17 // with this library; see the file COPYING3.  If not see
  18 // <http://www.gnu.org/licenses/>.
  19
  20 #include <sstream>
  21
  22 struct A {};
  23
  24 void operator<<(std::ostream&, const A&) { }
  25 void operator>>(std::istream&, A&) { }
  26
  27 class MyStream : private std::ostream, private std::istream
  28 {
  29 public:
  30   MyStream& operator <<(const char*)
  31   {
  32     return *this;
  33   }
  34   MyStream& operator >>(int&)
  35   {
  36     return *this;
  37   }
  38 };
  39
  40 class MyStream2
  41 {
  42 public:
  43   MyStream2& operator <<(const char*)
  44   {
  45     return *this;
  46   }
  47   MyStream2& operator >>(int&)
  48   {
  49     return *this;
  50   }
  51 private:
  52   operator std::ostream&();
  53   operator std::istream&();
  54 };
  55
  56 struct X { };
  57
  58 std::ostream& operator<<(std::ostream& os, const X&) { return os; }
  59 std::istream& operator>>(std::istream& is, X&&) { return is; }
  60
  61 struct O : std::ostream { };
  62
  63 void operator<<(O&, X) = delete;
  64
  65 struct I : std::istream { };
  66
  67 void operator>>(I&, X) = delete;
  68
  69 // PR libstdc++/65543
  70 // PR libstdc++/80675
  71 // PR libstdc++/80940
  72 int main()
  73 {
  74   A a;
  75
  76   std::ostringstream() << a;
  77   std::istringstream() >> a;
  78   MyStream stream{};
  79   stream << "aaa";
  80   int msi;
  81   stream >> msi;
  82   MyStream2 stream2{};
  83   stream2 << "aaa";
  84   stream2 >> msi;
  85   O{} << X{};
  86   I{} >> X{};
  87 }