按值删除向量中的元素 [英] Deleting an element in a vector by value

问题描述

我是C ++的新手，我的问题是如何从Flight中检索一个对象与主要的输入（flightNumber）进行比较？如何在main中声明属性类型？错误消息显示第二行最后一行'int'无效转换为'Flight'。

I'm new to C++ and my question is how can I retrieve an object from the Flight to be compared to the input (flightNumber) in the main? How do I declare the attributes type in the main? The error message displays "invalid conversion of 'int' to 'Flight' in the second last line.

class Flight{
int FlightNumber 
};
class TravelAgent
{
    vector <flight> flightList;
};
void Agent::delete(Flight *obj)
{
    vector<flight*>::iterator ptr;
    for(ptr=flightList.begin();ptr!=flightList.end();ptr++)
    {
        if((*Ptr)==obj)
        {
            flightList.erase(ptr);
            break;
        }
    }
    if ((ptr) == flightList.end())
    {
        cout<<"Flight not found"<<endl;
    }
}
int main{
      Agent agent1;
      int flightNumber;
      cout<<"Enter the number of the flight: "<<flush;
      in>>flightNumber;
      agent1.delete(flightNumber); 
}

推荐答案

尝试：

Try:

void Agent::delete(int flightNumber)
{
    vector<flight*>::iterator ptr;
    for(ptr=flightList.begin();ptr!=flightList.end();ptr++)
    {
        if( ptr->FlightNumber == flightNumber)
        {
           flightList.erase(ptr);
           return;
        }
    }
    if ((ptr) == flightList.end())
    {
        cout<<"Flight not found"<<endl;
    }
}

请注意， std :: vector 可能不是这项工作的最佳容器（参见 http://www.cplusplus.com / reference / vector / vector / erase / [ ^ ]详情）。

Please note, a std::vector is possibly NOT the best container for such a job (see http://www.cplusplus.com/reference/vector/vector/erase/[^] for details).

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