删除指向vector< int>的指针时出现段错误 [英] Seg fault when delete a pointer to vector<int>
问题描述
我有一个统计类，它有一个私有属性
''vector< int> * _x;''
统计数据的析构函数，我有这个代码来释放
内存：
统计数据::〜统计数据（）
{
if（_x）{
delete _x; //这里有段错...
}
}
但是我得到了一个Seg。我执行程序时出错。
你能告诉我我做错了什么吗？
谢谢。
（gdb）bt
＃0 0x00248eaa in __gnu_cxx :: __ pool< true> :: _ M_reclaim_block（）from
/usr/lib/libstdc++.so.6
＃1 0x0250da84 in __gnu_cxx :: __ mt_alloc< int，
__gnu_cxx :: __ common_pool_policy< __ gnu_cxx :: __ pool，true> > :: deallocate
（这= 0x9107474，__ p = 0xdadadada，__ = 152471256）at mt_allocator.h：746
＃2 0x0250daac in std :: _ Vector_base< int ，std :: allocator< int>
I have a class ''Statistics'' which has a private attribute
'' vector<int>* _x;''
And in the destructor of the Statistics, I have this code to free the
memory:
Statistics::~Statistics()
{
if (_x) {
delete _x; // Seg fault here...
}
}
But I get a Seg. Fault when I execute the program.
Can you please tell me what did I do wrong?
Thank you.
(gdb) bt
#0 0x00248eaa in __gnu_cxx::__pool<true>::_M_reclaim_block () from
/usr/lib/libstdc++.so.6
#1 0x0250da84 in __gnu_cxx::__mt_alloc<int,
__gnu_cxx::__common_pool_policy<__gnu_cxx::__pool, true> >::deallocate
(this=0x9107474, __p=0xdadadada, __n=152471256) at mt_allocator.h:746
#2 0x0250daac in std::_Vector_base<int, std::allocator<int>
:: _ M_deallocate（this = 0x9107474，__ p = 0x91686d8，__n = 0）at
::_M_deallocate (this=0x9107474, __p=0x91686d8, __n=0) at
stl_vector.h：123
＃3 0x0250dacd在~_Vector_base（this = 0x91686d8）stl_vector.h：109
＃4 0x0250db0b in~vector（this = 0x9107474）at stl_vector.h：273
＃5 0x0250caf2 in~Statistics（this = 0xbfd85ad8）at
Statistics.cpp：54
stl_vector.h:123
#3 0x0250dacd in ~_Vector_base (this=0x91686d8) at stl_vector.h:109
#4 0x0250db0b in ~vector (this=0x9107474) at stl_vector.h:273
#5 0x0250caf2 in ~Statistics (this=0xbfd85ad8) at
Statistics.cpp:54
推荐答案
Piotr写道：
我有一个统计类，它有一个私有属性
''vector< int> * _x;''
在统计数据的析构函数中，我有这段代码来释放内存：
统计数据::〜统计数据（）
{
if（_x）{
删除_x; //这里有段错...
}
}
但是我得到了一个Seg。我执行程序时出错。
你能告诉我我做错了什么吗？
看起来_x在您尝试删除它时无效。
需要查看其余代码处理_x知道怎么回事
。你在设置吗？尝试转换？删除它
两次？
（gdb）bt
＃0 0x00248eaa in __gnu_cxx :: __ pool< true> :: _ M_reclaim_block（）from
/ usr / lib / libstdc ++。so.6
＃1 0x0250da84 in __gnu_cxx :: __ mt_alloc< int，
__gnu_cxx :: __ common_pool_policy< __ gnu_cxx :: __ pool，true> > :: deallocate
（这= 0x9107474，__ p = 0xdadadada，__ = 152471256）at mt_allocator.h：746
I have a class ''Statistics'' which has a private attribute
'' vector<int>* _x;''
And in the destructor of the Statistics, I have this code to free the
memory:
Statistics::~Statistics()
{
if (_x) {
delete _x; // Seg fault here...
}
}
But I get a Seg. Fault when I execute the program.
Can you please tell me what did I do wrong?
Looks like _x isn''t valid at the point where you try to delete it.
Would need to see the rest of the code dealing with _x to know how that
happened. Are you setting it? Attempting conversions? Deleting it
twice?
(gdb) bt
#0 0x00248eaa in __gnu_cxx::__pool<true>::_M_reclaim_block () from
/usr/lib/libstdc++.so.6
#1 0x0250da84 in __gnu_cxx::__mt_alloc<int,
__gnu_cxx::__common_pool_policy<__gnu_cxx::__pool, true> >::deallocate
(this=0x9107474, __p=0xdadadada, __n=152471256) at mt_allocator.h:746
注意可疑的十六进制地址。 __p很可能是_x，
的值，我的猜测。使用您的调试器来追踪正在发生的事情。
Luke
Note the suspicious hex address. __p is likely to be the value of _x,
by my guess. Use your debugger to trace what''s going on.
Luke
谢谢。你可以解释一下'尝试转换
转换的意思吗？''
我把它设置在某个地方，否则，代码不会执行，对吧？
统计::〜统计（）
{
if（_x）{
删除_x; //这里有段错...
}
}
Thank you. Can you please explain what you meant by ''Attempting
conversions?''
And I have set it somewhere, otherwise, the code won''t execute, right?
Statistics::~Statistics()
{
if (_x) {
delete _x; // Seg fault here...
}
}
可以你能告诉我，如果
i有一个私有属性
''vector< int> * _x;''在我班级中，那么编写析构函数的正确方法是什么？
class statistic {
private：
vector< int> * _x;
};
Can you please tell me what is the right way to write the destructor if
i have a private attribute
of '' vector<int>* _x;'' in my class?
class Statistic {
private:
vector<int>* _x;
};
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