使用迭代器时崩溃 [英] Crash when used iterator

问题描述

我遇到了以下代码行的问题，它在删除时崩溃了。你能不能取悦代码让我知道这个问题





map :: iterator it = m_Map.begin（）;



while（it！= m_Map.end（））

{

CTest * pDTerst（it-> second） ）;

if（pDTerst）

删除pDTerst; /崩溃了好几次

it ++;

}

m_Map.clear（）;



我尝试了什么：



我试过调试后发现问题在





CTest * pDTerst（it-> second）;

if（pDTerst）

delete pDTerst; /崩溃有些时候

Iam having issue with the following line of code its crashing in delete. could you please the code and let me know the issue


map::iterator it = m_Map.begin();

while ( it != m_Map.end() )
{
CTest*pDTerst(it->second);
if ( pDTerst)
delete pDTerst; /crashing some times
it++;
}
m_Map.clear();

What I have tried:

I tried debugged and found the issue in the


CTest*pDTerst(it->second);
if ( pDTerst)
delete pDTerst; /crashing some times

推荐答案

你正在堆栈上创建一个 CTest 实例并尝试将其删除。这当然会崩溃，因为你只能删除使用 new 在堆上分配的对象。



所以你可能想做这样的事情（取决于第二个 std :: pair 元素的类型）：

You are creating a CTest instance on the stack and trying to delete it aftwerwards. That will of course crash because you can only delete objects that has been allocated on the heap using new.

So you would probably want to do something like this (depending on the type of the second std::pair element):

delete it->second;

请注意，无需检查 NULL 因为 delete 允许传递它（什么都不做）。

Note that there is no need to check for NULL because delete allows passing it (does nothing).

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