libstdc++-v3/testsuite/backward/strstream_move.cc

   1 // Copyright (C) 2018-2020 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-options "-Wno-deprecated" }
  19 // { dg-do run { target c++11 } }
  20
  21 #include <strstream>
  22 #include <testsuite_hooks.h>
  23
  24 void
  25 test01()
  26 {
  27   std::istrstream is("15 16");
  28   std::istrstream is2 = std::move(is);
  29   int a;
  30   is >> a;
  31   VERIFY( !is );
  32   is2 >> a;
  33   VERIFY( is2 );
  34   VERIFY( a == 15 );
  35   std::istrstream is3 = std::move(is2);
  36   int b;
  37   is2 >> b;
  38   VERIFY( !is2 );
  39   is3 >> b;
  40   VERIFY( is3 );
  41   VERIFY( b == 16 );
  42 }
  43
  44 void
  45 test02()
  46 {
  47   std::istrstream is("");
  48   int a;
  49   is >> a;
  50   VERIFY( !is );
  51   is = std::istrstream("17 18");
  52   is >> a;
  53   VERIFY( is );
  54   VERIFY( a == 17 );
  55   is = std::istrstream("");
  56   int b;
  57   is >> b;
  58   VERIFY( !is );
  59 }
  60
  61 void
  62 test03()
  63 {
  64   std::ostrstream os;
  65   os << "a few chars";  // fits in initial allocation
  66   char* s = os.str(); // os now frozen
  67   std::ostrstream os2 = std::move(os);
  68   VERIFY( os2.str() == s );
  69   VERIFY( os.str() == nullptr );
  70   os2.freeze(false);
  71
  72   os2 << "enough additional chars to force a reallocation";
  73   VERIFY( os2 );
  74   s = os2.str();  // os2 now frozen
  75   std::ostrstream os3 = std::move(os2);
  76   VERIFY( os3.str() == s );
  77   VERIFY( os2.str() == nullptr );
  78   delete[] s;
  79 }
  80
  81 void
  82 test04()
  83 {
  84   char buf[16];
  85   std::ostrstream os(buf, sizeof(buf));
  86   os << "a few chars";
  87   char* s = os.str(); // os now frozen
  88   VERIFY( s == buf );
  89   std::ostrstream os2 = std::move(os);
  90   VERIFY( os2.str() == s );
  91   VERIFY( os.str() == nullptr );
  92   os2.freeze(false);
  93
  94   os2 << "enough additional chars to force a reallocation";
  95   VERIFY( !os2 );
  96   s = os2.str();  // os2 now frozen
  97   VERIFY( s == buf );
  98   std::ostrstream os3 = std::move(os2);
  99   VERIFY( os3.str() == s );
 100   VERIFY( os2.str() == nullptr );
 101 }
 102
 103 void
 104 test05()
 105 {
 106   char buf[] = "0123456789";
 107   std::ostrstream os(buf, 1);
 108   os << "aa";
 109   VERIFY( !os );
 110   os = std::ostrstream(buf, 10);
 111   os << "some chars";
 112   VERIFY( os );
 113   VERIFY( os.pcount() == 10 );
 114   os << "a";
 115   VERIFY( !os );
 116   os = std::ostrstream();
 117   os << "a";
 118   VERIFY( os );
 119   VERIFY( os.pcount() == 1 );
 120   char* s = os.str(); // os now frozen
 121   os = std::ostrstream();
 122   os.freeze(false);   // no effect
 123   delete[] s;
 124 }
 125
 126 void
 127 test06()
 128 {
 129   char buf[] = "15 16";
 130   std::strstream ss(buf, 5, std::ios::in|std::ios::app);
 131   std::strstream ss2 = std::move(ss);
 132   int a;
 133   ss >> a;
 134   VERIFY( !ss );
 135   ss2 >> a;
 136   VERIFY( ss2 );
 137   VERIFY( a == 15 );
 138   std::strstream ss3 = std::move(ss2);
 139   int b;
 140   ss2 >> b;
 141   VERIFY( !ss2 );
 142   ss3 >> b;
 143   VERIFY( ss3 );
 144   VERIFY( b == 16 );
 145 }
 146
 147 void
 148 test07()
 149 {
 150   std::strstream ss;
 151   int a;
 152   ss >> a;
 153   VERIFY( !ss );
 154   char buf[] = "17 18";
 155   ss = std::strstream(buf, 5, std::ios::in|std::ios::app);
 156   ss >> a;
 157   VERIFY( ss );
 158   VERIFY( a == 17 );
 159   ss = std::strstream();
 160   int b;
 161   ss >> b;
 162   VERIFY( !ss );
 163 }
 164
 165 void
 166 test08()
 167 {
 168   std::strstream ss;
 169   ss << "a few chars";  // fits in initial allocation
 170   char* s = ss.str(); // ss now frozen
 171   std::strstream ss2 = std::move(ss);
 172   VERIFY( ss2.str() == s );
 173   VERIFY( ss.str() == nullptr );
 174   ss2.freeze(false);
 175
 176   ss2 << "enough additional chars to force a reallocation";
 177   VERIFY( ss2 );
 178   s = ss2.str();  // ss2 now frozen
 179   std::strstream ss3 = std::move(ss2);
 180   VERIFY( ss3.str() == s );
 181   VERIFY( ss2.str() == nullptr );
 182   delete[] s;
 183 }
 184
 185 void
 186 test09()
 187 {
 188   char buf[16];
 189   std::strstream ss(buf, sizeof(buf));
 190   ss << "a few chars";
 191   char* s = ss.str(); // ss now frozen
 192   VERIFY( s == buf );
 193   std::strstream ss2 = std::move(ss);
 194   VERIFY( ss2.str() == s );
 195   VERIFY( ss.str() == nullptr );
 196   ss2.freeze(false);
 197
 198   ss2 << "enough additional chars to force a reallocation";
 199   VERIFY( !ss2 );
 200   s = ss2.str();  // ss2 now frozen
 201   VERIFY( s == buf );
 202   std::strstream ss3 = std::move(ss2);
 203   VERIFY( ss3.str() == s );
 204   VERIFY( ss2.str() == nullptr );
 205 }
 206
 207 void
 208 test10()
 209 {
 210   char buf[] = "0123456789";
 211   std::strstream ss(buf, 1);
 212   ss << "aa";
 213   VERIFY( !ss );
 214   ss = std::strstream(buf, 10);
 215   ss << "some chars";
 216   VERIFY( ss );
 217   VERIFY( ss.pcount() == 10 );
 218   ss << "a";
 219   VERIFY( !ss );
 220   ss = std::strstream();
 221   ss << "a";
 222   VERIFY( ss );
 223   VERIFY( ss.pcount() == 1 );
 224   char* s = ss.str(); // ss now frozen
 225   ss = std::strstream();
 226   ss.freeze(false);   // no effect
 227   delete[] s;
 228 }
 229
 230 int
 231 main()
 232 {
 233   test01();
 234   test02();
 235   test03();
 236   test04();
 237   test05();
 238   test06();
 239   test07();
 240   test08();
 241   test09();
 242   test10();
 243 }