libcxx/test/std/input.output/iostreams.base/ios/iostate.flags/setstate.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 // <ios>
  10
  11 // template <class charT, class traits> class basic_ios
  12
  13 // void setstate(iostate state);
  14
  15 #include <ios>
  16 #include <streambuf>
  17 #include <cassert>
  18
  19 #include "test_macros.h"
  20
  21 struct testbuf : public std::streambuf {};
  22
  23 int main(int, char**)
  24 {
  25     {
  26         std::ios ios(0);
  27         ios.setstate(std::ios::goodbit);
  28         assert(ios.rdstate() == std::ios::badbit);
  29 #ifndef TEST_HAS_NO_EXCEPTIONS
  30         try
  31         {
  32             ios.exceptions(std::ios::badbit);
  33             assert(false);
  34         }
  35         catch (...)
  36         {
  37         }
  38         try
  39         {
  40             ios.setstate(std::ios::goodbit);
  41             assert(false);
  42         }
  43         catch (std::ios::failure&)
  44         {
  45             assert(ios.rdstate() == std::ios::badbit);
  46         }
  47         try
  48         {
  49             ios.setstate(std::ios::eofbit);
  50             assert(false);
  51         }
  52         catch (std::ios::failure&)
  53         {
  54             assert(ios.rdstate() == (std::ios::eofbit | std::ios::badbit));
  55         }
  56 #endif
  57     }
  58     {
  59         testbuf sb;
  60         std::ios ios(&sb);
  61         ios.setstate(std::ios::goodbit);
  62         assert(ios.rdstate() == std::ios::goodbit);
  63         ios.setstate(std::ios::eofbit);
  64         assert(ios.rdstate() == std::ios::eofbit);
  65         ios.setstate(std::ios::failbit);
  66         assert(ios.rdstate() == (std::ios::eofbit | std::ios::failbit));
  67     }
  68
  69   return 0;
  70 }