c++ - 我正在编写一个日历来存储带有多个生日对象的生日我是迭代器的新手并且在使用 find() 时遇到编译器错误

Question

I am making a calendar that stores birthdays in a multiset. The multiset actually stores birthday object pointers. I cant figure out how to use the find function with an iterator to pointers on a multiset

 MultiSet::MultiSet(string fName,string lName,int d,int m, int y):dateAndName(fName,lName,d,m,y)
    {
    }
    void MultiSet::searchByName( Birthday *a)
    {
        multiset<Birthday *>::iterator result;

     *I am getting a compiler error on this next line it reads*
      Error   1   error C2664:  : 
      cannot convert parameter 1 from 'Birthday' to 'Birthday       *const &. 

     **

I am just not really sure how to use the find function with an iterator to pointers

**

    result=nameSet.find(&a);

    if(result!=dateSet.end())
        cout<<result->getFirstName();
    else
        cout<<"Person not found. "<<endl;
}
void MultiSet::addToList(Birthday *a)
{
    nameSet.insert(a);
    dateSet.insert(a);
}

Answer 1

您的 a 变量是指向 Birthday 的指针，而您的多重集包含指向 Birthday 的指针，因此不是:

nameSet.find(&a); // ERROR! nameSet is a container of Birthday*
                  // objects, and not of Birthday** objects

你应该这样做:

nameSet.find(a); // OK: Here you just look for a pointer to Birthday