删除向量中所有的X

end()：超出末端迭代器，也就是末端元素的下一个。

删除所有的2--错误代码：

vector<int> ivec;ivec.push_back(1);ivec.push_back(2);ivec.push_back(2);ivec.push_back(3);for (vector<int>::iterator iter = ivec.begin(); iter != ivec.end(); iter++){if( *iter == 2){ivec.erase(iter);}}

iterator原型：

iterator erase (iterator position){      if (position + 1 != end()){          copy (position + 1, finish, position);    }      --finish;      destroy (finish);      return position;  } 

改正后的代码：

for (vector<int>::iterator iter = ivec.begin(); iter != ivec.end(); ){     if ( *iter == 2)         ivec.erase (iter);     else         iter ++ ;}