如果没有堆内存，如何释放std :: vector [英] How to release std::vector if there is no heap memory

问题描述

我有一个类成员变量，像这样：

  vector< vector< int& > m_stacks; 
  

当我填充它，我这样做：

 矢量< int> v; 
 v.push_back（1）; 
 v.push_back（2）; 
 m_stacks.push_back（v）; 
 vector< int> v2; 
 v2.push_back（1）; 
 v2.push_back（2）; 
 m_stacks.push_back（v2）; 
  

现在我想知道我应该在类析构函数中如何发布 m_stacks 。我不为它分配任何堆内存，所以如果我真的需要做任何事情，我很努力。最后我想出了这个 -

  vector< vector< int> > :: iterator itr = m_stacks.begin（）; 
 for（; itr！= m_stacks.end（）; ++ itr）{
 itr-> clear（）; 
} 
  

我认为这是我最需要做的，我不需要调用 m_stacks.clear（）。原因是vector的destructor可以自动释放内存。但是我仍然需要上面的代码，原因是向量的析构函数不调用其元素的析构函数。

你能确认我的调用吗？

m_stacks （ class

数据成员）。当类析构函数被调用时，获取的内存将被自动释放。这是使用 std :: vector 的目的。

I have a class member variable like this:

vector<vector<int> >  m_stacks;

When I populate it, I do like this:

vector<int> v;
v.push_back(1);
v.push_back(2);
m_stacks.push_back(v);
vector<int> v2;
v2.push_back(1);
v2.push_back(2);
m_stacks.push_back(v2);

Now I am wondering what I should do in the class destructor to release m_stacks. I do not allocate any heap memory for it, so I am struggling if I really need to do anything. Finally I come up this -

vector<vector<int> >::iterator itr = m_stacks.begin();
for ( ; itr != m_stacks.end(); ++itr) {
  itr->clear();
}

I think this is the most I need to do, I do not need to call m_stacks.clear(). The reason is vector's destructor can automatically release the memory. But I still need the above code though, the reason is vector's destructor does not call its element's destructor.

Could you confirm my call?

解决方案

You don't have to do anything for m_stacks (a class data member). Acquired memory will be released automatically when the class destructor will be called. This is the purpose for which std::vector is used.

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