safely delete of a vector element

[berge]

Hi!
My vector: vector<Appointment> appointments;

If I wish to delete an element in this vector, how can I do that. I know that it is possible to use:

appointments.erase (appointments.begin()+appointmentIndex);

but I have been told that this method isn't safe.

[Disch]

That method is just fine.

[jsmith]

It's safe only insofar as the vector contains at least appointmentIndex+1 elements.

You should verify this precondition before trying to erase an element that might not exist.