libstdc++-v3/testsuite/ext/rope/7.cc

   1 // Copyright (C) 2018-2024 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 // rope (SGI extension)
  19
  20 // { dg-do run }
  21
  22 #include <ext/rope>
  23 #include <testsuite_hooks.h>
  24
  25 void
  26 test01()
  27 {
  28   using __gnu_cxx::crope;
  29
  30   char str_a[] =
  31     "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
  32     "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
  33     "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
  34     "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
  35     "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa";
  36   char str_b[] =
  37     "bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb"
  38     "bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb"
  39     "bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb"
  40     "bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb"
  41     "bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb";
  42
  43   // Create ropes with leaf nodes longer than __lazy_threshold = 128
  44   // so substring nodes will be created by the next step
  45   crope leaf_rope_a(str_a);
  46   crope leaf_rope_b(str_b);
  47
  48   // Create ropes with substring nodes referencing the leaf nodes
  49   // of the prior ropes
  50   crope substring_rope_a(leaf_rope_a.begin() + 1,
  51                          leaf_rope_a.begin() + 199);
  52   crope substring_rope_b(leaf_rope_b.begin() + 1,
  53                          leaf_rope_b.begin() + 199);
  54
  55   // Create iterators to substring_rope_a
  56   crope::const_iterator cit_orig = substring_rope_a.begin();
  57   crope::iterator mit_orig = substring_rope_a.mutable_begin();
  58
  59   // Dereference the iterators so they cache a portion of the substring
  60   // node in their internal buffers
  61   *cit_orig;
  62   *mit_orig;
  63
  64   // Copy the original iterators, via both copy constructors and
  65   // assignment operators.  Prior to the bug fix, these iterators
  66   // retained pointers to the internal buffers of the original
  67   // iterators.
  68   crope::const_iterator cit_copy(cit_orig);
  69   crope::iterator mit_copy(mit_orig);
  70   crope::const_iterator cit_assign; cit_assign = cit_orig;
  71   crope::iterator mit_assign; mit_assign = mit_orig;
  72
  73   // Modify the original iterators to refer to substring_rope_b
  74   cit_orig = substring_rope_b.begin();
  75   mit_orig = substring_rope_b.mutable_begin();
  76
  77   // Dereference the original iterators so they fill their internal
  78   // buffers with part of substring_rope_b
  79   *cit_orig;
  80   *mit_orig;
  81
  82   // Verify that the copied iterators return data from
  83   // substring_rope_a, not substring_rope_b
  84   VERIFY(*cit_copy == 'a');
  85   VERIFY(*mit_copy == 'a');
  86   VERIFY(*cit_assign == 'a');
  87   VERIFY(*mit_assign == 'a');
  88 }
  89
  90 int
  91 main()
  92 {
  93   test01();
  94   return 0;
  95 }