我如何根据某些值 erase/delete class 个对象的向量

Question

P S ：可能已经有人问过这个问题，但我尝试了很多，而且我没有将指针与向量一起使用。如果解决方案是这样，请在这里告诉我如何使用指针。

我的问题：我正在创建一个包含 Car class 个实例的向量，并使用了 getter 和 setter 方法在其中检索和推送新记录。即使我也在编辑该记录，但 我不知道如何删除特定记录！ 我已将代码放在我自己尝试的注释中。有人可以帮我从这个向量中 remove/erase class 的特定记录/实例吗？

提前致谢。

Car.cpp

#include "Car.h"
#include "global.h"
#include <string>
#include <vector>
#include <algorithm>
#include <iomanip>
int cid =1;

string Name;
float Price;

//In this function I want to delete the records
void deleteCarVector( vector<Car>& newAllCar)
{
    int id;
    cout << "\n\t\t Please Enter the Id of Car to Delete Car Details :  ";
    cin >> id;
    //replace (newAllCar.begin(), newAllCar.end(),"a","b");

    unsigned int size = newAllCar.size();
    for (unsigned int i = 0; i < size; i++)
    {
        if(newAllCar[i].getId() == id)
        {
            cout << "Current Car Name : "<<newAllCar[i].getName() << "\n";

            // Here Exactly the problem!
            // delete newAllCar[i];
            // newAllCar.erase(newAllCar[i].newName);
            // newAllCar.erase(remove(newAllCar.begin(),newAllCar.end(),newAllCar.at(i).getId()));
        }
    }
    printCarVector(newAllCar);
    cout << endl;
}

Answer 1

Even i'm editing that records also but i dont know how to delete particular record??? I have putted the code in comments which i tried by myself so if anybody knows please telll me how can i "remove/erase" the particular record from vector class object?

您的问题本身就有答案：根据您提供的 key/id，您需要 Erase–remove idiom 从 std::vector < Car > 中删除 Car 对象。

carVec.erase(std::remove_if(carVec.begin(), carVec.end(), [&id_to_delete](const Car& ele)->bool
            {
                return ele.getnewId() == id_to_delete;
            }), carVec.end());

LIVE DEMO

Answer 2

如果您不想使用 lambda 函数，您可以执行如下操作

void deleteCarVector( vector<Car>& newAllCar)
{
    int id;
    cout<<" \n\t\t Please Enter the Id of Car to Delete Car Details :  ";
    cin>>id;

    auto carItr = newAllCar.begin();

    while(carItr != newAllCar.end())
    {
        if((*carItr)->getId==id)
        {
            delete *carItr;
            newAllCar.erase(carItr);
            break;
        }
        carItr++;
    }

    printCarVector(newAllCar);

    cout << endl;
}

我如何根据某些值 erase/delete class 个对象的向量

How can I erase/delete vector of class objects according to some Values

c++

algorithm

class

stdvector

c++11

Car.cpp