删除循环中向量的元素 [英] Remove elements of a vector inside the loop

问题描述

我知道有一个类似的问题，但我没有设法找到的方式在我的代码，他们的援助。我只想通过检查循环中该元素的属性来删除/删除向量的元素。我该怎么办？我尝试下面的代码，但我收到错误的模糊消息：

I know that there are similar questions to this one, but I didn’t manage to find the way on my code by their aid. I want merely to delete/remove an element of a vector by checking an attribute of this element inside a loop. How can I do that? I tried the following code but I receive the vague message of error:

'operator ='函数在播放器中不可用。

'operator =' function is unavailable in 'Player’.

 for (vector<Player>::iterator it = allPlayers.begin(); it != allPlayers.end(); it++)
 {
     if(it->getpMoney()<=0) 
         it = allPlayers.erase(it);
     else 
         ++it;
 }

我该怎么办？

更新：您认为 vector :: erase with pointer member 属于同一个问题？因此我需要一个赋值运算符？为什么？

Update: Do you think that the question vector::erase with pointer member pertains to the same problem? Do I need hence an assignment operator? Why?

推荐答案

您不应该在 it > for loop：

You should not increment it in the for loop:

for (vector<Player>::iterator it=allPlayers.begin(); 
                              it!=allPlayers.end(); 
                              /*it++*/) <----------- I commented it.
{

   if(it->getpMoney()<=0) 
      it = allPlayers.erase(it);
  else 
      ++it;
 }

注意注释的部分; it ++ 在那里不需要，因为 it 在for-body本身增加。

Notice the commented part;it++ is not needed there, as it is getting incremented in the for-body itself.

错误'operator ='function在'Player'中不可用，它来自 erase（）的使用， c $ c> operator = 在向量中移动元素。为了使用 erase（），类 Player 的对象必须是可分配的，这意味着您需要实现 operator = 为玩家类。

As for the error "'operator =' function is unavailable in 'Player’", it comes from the usage of erase() which internally uses operator= to move elements in the vector. In order to use erase(), the objects of class Player must be assignable, which means you need to implement operator= for Player class.

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