#include<iostream>#include<forward_list>using namespace std;int main(){    forward_list<int> flst={0,1,2,3,4,5,6,7,8,9};    auto prev=flst.before_begin();    auto curr=flst.begin();    while(curr!=flst.end())    {        if(*curr%2)
//当找到奇数元素时，我们将prev传递给erase_after。此调用将prev之后的元素删除，即，删除curr指向的元素。然后我们将curr重置为erase_after的返回值。            curr=flst.erase_after(prev);        else        {            prev=curr;            ++curr;        }    }    for(auto f:flst)        cout<<f<<" ";    cout<<endl;    return 0;}