libstdc++-v3/testsuite/27_io/basic_filebuf/close/wchar_t/81256.cc

   1 // Copyright (C) 2018-2022 Free Software Foundation, Inc.
   2 //
   3 // This file is part of the GNU ISO C++ Library.  This library is free
   4 // software; you can redistribute it and/or modify it under the
   5 // terms of the GNU General Public License as published by the
   6 // Free Software Foundation; either version 3, or (at your option)
   7 // any later version.
   8
   9 // This library is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13
  14 // You should have received a copy of the GNU General Public License along
  15 // with this library; see the file COPYING3.  If not see
  16 // <http://www.gnu.org/licenses/>.
  17
  18 // { dg-do run { target c++11 } }
  19
  20 #include <fstream>
  21 #include <locale>
  22 #include <testsuite_hooks.h>
  23
  24 struct E : std::runtime_error
  25 {
  26   E() : runtime_error("") { }
  27 };
  28
  29 struct Cvt : std::codecvt<wchar_t, char, std::mbstate_t>
  30 {
  31   explicit Cvt(size_t refs) : codecvt(refs) { }
  32
  33   mutable int exceptions_thrown = 0;
  34
  35 private:
  36   int
  37   do_encoding() const noexcept override
  38   { return -1; }
  39
  40   bool
  41   do_always_noconv() const noexcept override
  42   { return false; }
  43
  44   result
  45   do_unshift(state_type&, char*, char*, char*&) const override
  46   {
  47     ++exceptions_thrown;
  48     throw E();
  49   }
  50 };
  51
  52 struct filebuf : std::basic_filebuf<wchar_t>
  53 {
  54   explicit filebuf(Cvt* c)
  55   {
  56     std::locale loc(std::locale::classic(), c);
  57     imbue(loc);
  58   }
  59 };
  60
  61 void
  62 test01()
  63 {
  64   // This facet needs to still be valid when ~basic_filebuf runs:
  65   Cvt conv{1};
  66   {
  67     filebuf fb(&conv);
  68     fb.open("output.txt", std::wios::out);
  69     fb.sputn(L"x", 1);
  70
  71     bool caught = false;
  72     try
  73     {
  74       /* [filebuf.members] p7: If one of these calls throws an exception,
  75        * the exception is caught and rethrown after closing the file.  */
  76       fb.close();
  77     }
  78     catch (const E&)
  79     {
  80       caught = true;
  81     }
  82     VERIFY( conv.exceptions_thrown == 1 );
  83     VERIFY( caught );
  84   }
  85   VERIFY( conv.exceptions_thrown == 1 );
  86 }
  87
  88 void
  89 test02()
  90 {
  91   // This facet needs to still be valid when ~basic_filebuf runs:
  92   Cvt conv{1};
  93   {
  94     filebuf fb(&conv);
  95     fb.open("output.txt", std::wios::out);
  96     fb.sputn(L"x", 1);
  97     /* [filebuf.cons] p5: If an exception occurs during the destruction
  98      * of the object, including the call to close(), the exception is
  99      * caught but not rethrown.  */
 100   }
 101   VERIFY( conv.exceptions_thrown == 1 );
 102 }
 103
 104 int
 105 main()
 106 {
 107   test01();
 108   test02();
 109 }