Design Patterns - Factory Method Pattern Explanation and Implementation in C++

►Lesson Description: In this lesson I teach you about a creational design pattern to have a single point in which you allocate objects at run-time. This is the factory method (or factory function), which takes advantage of inheritance based polymorphism to create the correct object at run-time and return it to the user.

00:00 Factory method and definition
1:25 Goal of the factory method pattern
2:37 Inheritance based polymorphism
3:40 Start of implementation with interface
4:50 Creating derived classes
5:58 Creation of our factory
9:15 Confirming the factory works in GDB
10:50 Refactoring our factory arguments with enum class
14:35 Returning a smart pointer from our factory
16:12 Confirming no memory leaks with valgrind
17:30 Recap of source code and pattern
18:00 Pros and cons of the pattern

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[anhurtjv]

Your video is probably one of the best I have found in how to use design patterns in C++. It is really clear, and the fact that you show in real time what you are doing really helps follow the content.

[stevea.b.]

Thank you for explaining these patterns so clearly and for keeping it simple. Other sources I tried made them seem very complicated and I almost gave up.. thankfully I came across your channel! I can't thank you enough.

[k]

amazing. I'm so lucky to have the chance to watch your

[bharatpatidar]

Man i just got the understanding of Factory Design pattern after watching it so easily
Thanks a lot 🙏

[sallaklamhayyen]

amazing as always = thank you so much Dr. Mike

[anuragmeshram]

Can you please make a series on the how to make use of debugger to the fullest. I have never seen or even knew that we can view vtable using it. Or if you could recommend any good resource for it.

[blaisofotso]

Hallo Mike,
I understood the code you implemented, but I do not understand why you have to it that way. Why did you have to go through a factory method to create those objects?
I do not get the point of factory method. Layman terms could also help me when explaining.
Merry Christmas

[riamuglihal]

Absolutely loved your teaching style! 🙌 Thanks for the cool tip: --tui

[AnthonyWang-ri]

Thanks for the clear explanation and great content. According to refactoring guru, the design pattern "factory method" would have a creator, concrete creators, product, and concrete products. In the example you provided, MakeGameObjectFactory seems to be an object creation function that abstracts away the object creation process and provides an easier way to create objects. I'm wondering if this is a simplified variation of the factory method, or if this still aligns well with the standard factory method? Thanks.

[essmunson]

_thank you thank you thank you_ for the clear explanation

[maheshshinde]

Can we keep factory method as static class method and keep class constructor private? so only from factory method we can create instance of class.

[Praveer]

Curious, Is there any reason to use shared_ptr? in general, by default people use unique_ptr.

[windowsbuilderthegreat]

Does this pattern have to use heap allocation to work

[tanveerasif]

isn't it, same as command pattern ?