c++ std::vector 删除指定元素的两种形式

#include <iostream>
#include <vector>
#include <algorithm>
#include <memory>

using namespace std;
class Display
{
    public:
    Display(int pid):removeBoo(false)
    {
        id = pid;
    }
    ~Display()
    {

    }
    void showInfo(){
        cout << "dispatch evt id: "<< id << endl;
    }
    //
    bool removeBoo;
    //
    int getId(){
        return id;
    }
    private:
        int id;
};
std::vector<std::shared_ptr<Display>> s_display_vec;
// 不需要保持原有顺序的
void removeEleTest1()
        {
            std::vector <std::shared_ptr<Display>>::iterator iter = s_display_vec.begin();
            for (; iter != s_display_vec.end();)
            {
                if ((*iter)->removeBoo) {
                    std::swap(*iter,s_display_vec.back());
                    s_display_vec.pop_back();
　　　　　　　　　　　　// c++11这样做没必要
                    //if(s_display_vec.size() < 1) break;

                }
                else
                {
                    (*iter)->showInfo();
                    ++iter;
                }

            }
        }
///*
// 需要保持原有顺序的
void removeEleTest2()
        {
            std::vector <std::shared_ptr<Display>>::iterator iter = s_display_vec.begin();
            for (; iter != s_display_vec.end();)
            {
                if ((*iter)->removeBoo) {
                    // 在这里将target的标记,记录为未加入列表
                    //(*iter)
                    if (iter == s_display_vec.end())
                    {
                        cout << "--a delete " <<(*iter)->getId()<<"--"<< endl;
                        s_display_vec.pop_back();
                        break;
                    }
                    else {
                        cout << "--b delete " <<(*iter)->getId()<<"--"<< endl;
                        iter = s_display_vec.erase(iter);
                    }
                }
                else
                {
                    (*iter)->showInfo();
                    ++iter;
                }

            }
        }
//*/
int main()
{
    cout << "Hello world!" << endl;
    //int j = 0;
    std::shared_ptr<Display> dp_0 = std::make_shared<Display>(0);
    std::shared_ptr<Display> dp_1 = std::make_shared<Display>(1);
    std::shared_ptr<Display> dp_2 = std::make_shared<Display>(2);
    std::shared_ptr<Display> dp_3 = std::make_shared<Display>(3);
    std::shared_ptr<Display> dp_4 = std::make_shared<Display>(4);
    ///*
    s_display_vec.push_back(dp_0);
    s_display_vec.push_back(dp_1);
    s_display_vec.push_back(dp_2);
    s_display_vec.push_back(dp_3);
    s_display_vec.push_back(dp_4);
    cout << "s_display_vec.size: "<< s_display_vec.size() << endl;
    cout << "------------------" << endl;
    // 设置哪一个可以被删除
    dp_3->removeBoo = true;

    removeEleTest2();
    cout << "----------aaa--------" << endl;
    removeEleTest2();
    cout << "s_display_vec.size: "<< s_display_vec.size() << endl;
    //*/
    return 0;
}