Difference between revisions of "Intermediate C++ Game Programming Tutorial 17"
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[https://youtu.be/O2-jdGGCFkE Tutorial 17.1] | [https://youtu.be/O2-jdGGCFkE Tutorial 17.1] | ||
− | * What is inheritance? Introducing a simple example [https://youtu.be/O2-jdGGCFkE?t=15 0:15] | + | * What is inheritance? Introducing a simple example <code>class B : public A {...};</code>[https://youtu.be/O2-jdGGCFkE?t=15 0:15] |
[https://youtu.be/21uaUOeOof8 Tutorial 17.2] | [https://youtu.be/21uaUOeOof8 Tutorial 17.2] |
Revision as of 04:44, 6 October 2019
This two-part lesson teaches the basics of inheritance, how it works and what motivates its use, with ample concrete coding examples. Also taught here is the keyword mutable
, for some reason.
Contents
Topics Covered
Part 1
- How to inherit from a class
- Referencing a child type with a parent reference/ptr
- Inheritance and constructors
- Overriding parent functions
- Invoking overridden versions of functions
- Access specifier
protected
Part 2
- Hierarchical inheritance
- Abstract vs. concrete classes
-
mutable
data members
Video Timestamp Index
- What is inheritance? Introducing a simple example
class B : public A {...};
0:15
- WORK-IN-PROGRESS
Part 2 Class Specification
All of the MemeFighter
entities of the system will have the following shared functionality:
- Member data for
name
(string),hp
,speed
, andpower
(int) - Getters for name, initiative (speed + 2d6), and alive state
-
Punch
function that takes a different entity and applies damage (str + 2d6) to it -
Tick
function where the entity recovers 1d6 hp
Functions should narrate actions / effects when it makes sense. Tests should be made to check whether an entity is alive before an action is performed (dead characters can't punch, recover, etc.)
There are two concrete MemeFighter
entites: MemeFrog
and MemeStoner
MemeFrog
:
- Has 69 hp, 7 speed, and 14 power
- Has a
SpecialMove
function that takes an entity and has a 1/3 chance of dealing 3d6 + 20 damage - Takes 1d6 of damage every turn
MemeStoner
:
- Has 80 hp, 4 speed, and 10 power
- Has a
SpecialMove
function that takes no parameters and has a 1/2 chance of adding 3 speed, increasing power by 69/42, adding 10 hp, and adding to the entity's name
Source Code
Links
C++ FAQ on protected
Stack Overflow question about inheritance