std::_Rb_tree_increment (__x=0x1) 的分段错误

发布于 2024-12-29 05:53:07 字数 684 浏览 2 评论 0原文

迭代集合时出现分段错误。

堆栈跟踪指向：

  0x000000081193ccc5 in std::_Rb_tree_increment (__x=0x1) at /libstdc++/src/tree.cc:68
  0x0000000806c3107e in std::_Rb_tree_const_iterator<test *>::operator++     at stl_tree.h:266

但我没有得到更多信息，但崩溃的最后一行如下。

迭代器是在一个集合上。

 typedef std::set<test*,test_less> test_set_t;

 test_set_t& set(bt->getSet());   // getSet() will return reference to the class bt member variable set

 test_set_t::iterator pos = set.begin();

 test empty(val);
 test* last_ptr = &empty;

 for (; pos != set.end(); last_ptr = *pos++) {       // gdb shows this as last line

我看不到这个问题。提前致谢。

原文

I get a segmentation fault when iterating over a set.

The stack trace points to:

  0x000000081193ccc5 in std::_Rb_tree_increment (__x=0x1) at /libstdc++/src/tree.cc:68
  0x0000000806c3107e in std::_Rb_tree_const_iterator<test *>::operator++     at stl_tree.h:266

but I get nothing more informative but the last line of crash is as below.

The iterator is over a set.

 typedef std::set<test*,test_less> test_set_t;

 test_set_t& set(bt->getSet());   // getSet() will return reference to the class bt member variable set

 test_set_t::iterator pos = set.begin();

 test empty(val);
 test* last_ptr = ∅

 for (; pos != set.end(); last_ptr = *pos++) {       // gdb shows this as last line

I cannot see the issue. Thanks in advance.

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落花随流水 2025-01-05 05:53:07

很可能该集合为空，或者您在迭代时删除了 pos 所指向的项目。

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梦幻的心爱 2025-01-05 05:53:07

我遇到类似的问题

set<int> sec;
sec.insert(1);
set<int>::iterator iter = sec.begin();
iter = sec.erase(iter);
cout << 1 << endl;
iter = sec.erase(iter);
cout << 1 << endl;

_Rb_tree_increment 可能会被锁定，如果传递给它的迭代器无效或损坏，例如空集的结束迭代器。
所以我们可以插入Sentinel节点来保证set不会为null或者检查set为null。

I meet the similar problem

set<int> sec;
sec.insert(1);
set<int>::iterator iter = sec.begin();
iter = sec.erase(iter);
cout << 1 << endl;
iter = sec.erase(iter);
cout << 1 << endl;

_Rb_tree_increment may be locked if the iterator passed to it is invalid or corrupted, such as the end iterator of an empty set.
So we can insert Sentinel node to guarantee set will not null or check set is null.

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~没有更多了~