test/std/input.output/iostreams.base/ios/iostate.flags/clear.pass.cpp

   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 // XFAIL: libcpp-no-exceptions
  11 // <ios>
  12
  13 // template <class charT, class traits> class basic_ios
  14
  15 // void clear(iostate state = goodbit);
  16
  17 #include <ios>
  18 #include <streambuf>
  19 #include <cassert>
  20
  21 struct testbuf : public std::streambuf {};
  22
  23 int main()
  24 {
  25     {
  26         std::ios ios(0);
  27         ios.clear();
  28         assert(ios.rdstate() == std::ios::badbit);
  29         try
  30         {
  31             ios.exceptions(std::ios::badbit);
  32         }
  33         catch (...)
  34         {
  35         }
  36         try
  37         {
  38             ios.clear();
  39             assert(false);
  40         }
  41         catch (std::ios::failure&)
  42         {
  43             assert(ios.rdstate() == std::ios::badbit);
  44         }
  45         try
  46         {
  47             ios.clear(std::ios::eofbit);
  48             assert(false);
  49         }
  50         catch (std::ios::failure&)
  51         {
  52             assert(ios.rdstate() == (std::ios::eofbit | std::ios::badbit));
  53         }
  54     }
  55     {
  56         testbuf sb;
  57         std::ios ios(&sb);
  58         ios.clear();
  59         assert(ios.rdstate() == std::ios::goodbit);
  60         ios.exceptions(std::ios::badbit);
  61         ios.clear();
  62         assert(ios.rdstate() == std::ios::goodbit);
  63         ios.clear(std::ios::eofbit);
  64         assert(ios.rdstate() == std::ios::eofbit);
  65     }
  66 }