CODEWITHSUNDEEP
c++objectvector
Troller
Troller

Reputation: 1138

Removing objects from a vector

I have stored objects in a vector, where each object has a staff number property. If a user wants to delete an object from the vector, the user can enter the staff number so that the specific object will get deleted from the vector.

void Administrator::deleteMember()
{
    string staffNumber;
    FileHandler<Administrator> adminTObj;
    cout<<"Enter Staff Number of the Member to Delete"<<endl;
    cin>>staffNumber;

    if(staffNumber.find("Ad"))
    {
        vector<Administrator> myVec=adminTObj.getVectorAdministrator();
        for(Administrator iter:myVec)
        {
            if(iter.getStaffNumber()==staffNumber)  //checks if the staff number matches an object's staff number 
            {
                // If it matches it should delete the record (Need to implement)
            }
        }
    }
}

How do I delete the object from the vector?

Upvotes: 1

Views: 118

Answers (4)

juanchopanza
juanchopanza

Reputation: 227418

If you have a single element, you can use std::find_if to get an iterator to the element, and std::vector::erase to remove it. 

auto it = std::find_if(myVec.begin(), 
                       myVec.end(),
                       [staffNumber](const Administrator& a)
                       { return a.getStaffNumber() == staffNumber; });

myVec.erase(it);

If you want to remove all elements satisfying a criterion, use std::remove_if and std::vector::erase (the erase-remove idiom). 

auto it = std::remove_if(myVec.begin(), 
                         myVec.end(),
                         [staffNumber](const Administrator& a)
                         { return a.getStaffNumber() == staffNumber; });

myVec.erase(it, myVec.end());

Upvotes: 6

Evan Carslake
Evan Carslake

Reputation: 2359

This is how to erase a specific item from the vector by its index id.

int at;
vector<Administrator> myVec=adminTObj.getVectorAdministrator();
at = indexToErase;
myVec.erase(myVec.begin()+at)

Upvotes: 0

Codor
Codor

Reputation: 17605

You could use the erase method, which is documented here; however you should break the loop immediateley afterwards, as the call of erase would perhaps invalidate the iterator.

Upvotes: 0

vsoftco
vsoftco

Reputation: 56557

Use the member function vector::erase(), see http://www.cplusplus.com/reference/vector/vector/erase/

Upvotes: 0

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