deletion of user defined <list>

[kathlyn]

myset is a user defined class. I am trying to delete the element using "remove" but it gives an error

for (list<myset>::iterator i=a[v].begin(); i!=a[v].end(); i++)
{ cout << *i << " ";
k.remove(*i);}

Please help. Thanks in advance

[dev7060]

myset is a user defined class. I am trying to delete the element using "remove" but it gives an error

for (list<myset>::iterator i=a[v].begin(); i!=a[v].end(); i++)
{ cout << *i << " ";
k.remove(*i);}

Please help. Thanks in advance

- What error?
- What's a[v]?
- What's with the usage of *i?
- What's k?
- 'remove()' removes all the elements in the list container that are equal to the value passed in the argument. But it probably needs an operator== implementation to know how to compare the two objects.

[iamkajal]

you should try this

/ C++ code to demonstrate the working of erase()

#include<iostream>
#include<list> // for list operations
using namespace std;
 
int main()
{
    // initializing list of integers
    list<int> list1={10,15,20,25,30,35};
 
    // declaring list iterators
    list<int>::iterator it = list1.begin();
    list<int>::iterator it1 = list1.begin();
 
    // incrementing the positions of iterators
    advance(it,2);
    advance(it1,5);
 
    // printing original list
    cout << "The original list is : ";
    for (list<int>::iterator i=list1.begin(); i!=list1.end(); i++)
       cout << *i << " ";
 
    cout << endl;
 
    // using erase() to erase single element
    // erases 20
    list1.erase(it);
 
    // list after deletion 1 element
    cout << "The list after deleting 1 element using erase() : ";
    for (list<int>::iterator i=list1.begin(); i!=list1.end(); i++)
       cout << *i << " ";
 
    cout << endl;
 
    it = list1.begin();
 
    // incrementing the positions of iterators
    advance(it,2);
 
    // using erase() to erase multiple elements
    // erases 25,30
    list1.erase(it,it1);
 
    // list after deletion of multiple elements
    cout << "The list after deleting multiple elements using erase() : ";
    for (list<int>::iterator i=list1.begin(); i!=list1.end(); i++)
       cout << *i << " ";
 
    cout << endl;
 
 
}