Discussion Questions, Lecture 12

Discussion Questions / Events

1:00
Homework discussion (HW3). Relevant.
3:00
Content start, dynamic memory.
6:52
Student question. How is the proper constructor chosen.
10:40
Green pen walkthrough of vector copy code.
14:00
Student question, why not include copy code directly? Hal's answer: because we will want to reuse copy.

Digression to this

16:00
this->capacity = other.capacity written on transparency.

Overloading assignment

17:30
Subtle difference between initialization and assignment.
20:00
Stepping through the syntax of operator overloading on overhead. Rewriting the line second from bottom of N-28.
22.00
this pointer
23:00
Written on transparency:

vector a, b

a = b;

Box pictures to illustrate assignment process and use of storage.
25:50
Overhead shows item 2 and 3 from Overloaded operator= transparency (n-30).
27:00
Important detail - watch out for self assignment.
28:41
Written on overhead: x = y = z = 0, x = (y = (z = 0)). This is to show why the assignment operator needs to return a value (which is a reference).
31:00
Here are a few student question on operator overloading. The first is whether other operations (such as +) can be overloaded for vectors (it can be). There is a question on multiple assignment and then an unclear question that leads Hal to mention that there are restrictions on how overloading can be used.

Inheritance

39:00
Start of the big topic for object oriented programming. The main point for the last 10 minutes of the lecture is the distinction between has-A and is-A relationships. It is very important to make sure students understand this.
47:00>
Beginning the mechanics of implementing inheritance.