CRTP and Library Design — Handmade Chat — Episode Guide

0:08Recap yesterday's graphics driver crash and determine to set up an external streaming system

4:20Invite questions and suggestions

6:38vaualbus How do you write a program that is graphics driver crash aware?

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6:38vaualbus How do you write a program that is graphics driver crash aware?

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6:38vaualbus How do you write a program that is graphics driver crash aware?

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8:36Install and run Process Explorer, and consider graphics driver crashes¹

14:37Making your app graphics card crash proof: 1) Always check for valid contexts

15:45Making your app graphics card crash proof: 2) Use fault handlers

16:28How OBS could handle faults, just protect and flush the stream on crash

17:25Shutting down gracefully and relaunching your application

18:40crazy_coder456 How many episodes remaining, estimate?

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18:40crazy_coder456 How many episodes remaining, estimate?

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18:40crazy_coder456 How many episodes remaining, estimate?

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19:39sgtrumbi Do you use C++ features like templates? Do you use polymorphism in your own projects?

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19:39sgtrumbi Do you use C++ features like templates? Do you use polymorphism in your own projects?

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19:39sgtrumbi Do you use C++ features like templates? Do you use polymorphism in your own projects?

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22:47bpaf What do you think about the CRTP to do polymorphism?²

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22:47bpaf What do you think about the CRTP to do polymorphism?²

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22:47bpaf What do you think about the CRTP to do polymorphism?²

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25:18crtp.cpp: Curiously recurring template pattern

27:28crtp.cpp: The template<struct Something> syntax

31:29Consider ramifications of templates

34:40crtp.cpp: Using a union in a parent struct to contain entity types

37:10crtp.cpp: C++'s "struct entity_ghost : public entity" inheritance syntax

40:59crtp.cpp: Consider ramifications of the inheritance model

45:42crtp.cpp: Making the derived class more primal

50:06Polymorphic copy construction, virtual functions and the copy constructor³

56:44crtp.cpp: Spec out our desired Clone() function, using a union in the parent shape struct to contain shape_rectangle and shape_circle, and a switch statement in Clone()

1:00:20crtp2.cpp: Attempt this in a C++ way

1:04:03crtp2.cpp: Run-time type information⁴

1:09:34crtp2.cpp: Virtual function call for Clone() in the structs

1:11:08crtp2.cpp: Base class containing a pure virtual function for cloning, and a shape_cloner templatised struct

1:14:57bpaf I didn't want to use virtual functions, so when I found this I was super happy

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1:14:57bpaf I didn't want to use virtual functions, so when I found this I was super happy

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1:14:57bpaf I didn't want to use virtual functions, so when I found this I was super happy

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1:15:46Polymorphic chaining⁵

1:20:18bpaf My use case is: I write a library, and I want users of the library to provide their own structs for me to do my library business on, so I need polymorphism one way or another and, since it's a simulation, I want to remove all of the runtime cost I can incur

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1:20:18bpaf My use case is: I write a library, and I want users of the library to provide their own structs for me to do my library business on, so I need polymorphism one way or another and, since it's a simulation, I want to remove all of the runtime cost I can incur

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1:20:18bpaf My use case is: I write a library, and I want users of the library to provide their own structs for me to do my library business on, so I need polymorphism one way or another and, since it's a simulation, I want to remove all of the runtime cost I can incur

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1:21:56bpaf You got it, I have to call them back

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1:21:56bpaf You got it, I have to call them back

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1:21:56bpaf You got it, I have to call them back

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1:22:17bpaf They define a game, and I define in the library a genetic programming framework to find players that play well at them

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1:22:17bpaf They define a game, and I define in the library a genetic programming framework to find players that play well at them

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1:22:17bpaf They define a game, and I define in the library a genetic programming framework to find players that play well at them

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1:23:27bpaf In particular I create trees (S-expressions) that contain terminals that are defined by the game, which operate on the game state, and then evaluate those games that contains IF, >, == etc, as well as the game terminals, and then make players out of random trees, and do tournaments between each other

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1:23:27bpaf In particular I create trees (S-expressions) that contain terminals that are defined by the game, which operate on the game state, and then evaluate those games that contains IF, >, == etc, as well as the game terminals, and then make players out of random trees, and do tournaments between each other

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1:23:27bpaf In particular I create trees (S-expressions) that contain terminals that are defined by the game, which operate on the game state, and then evaluate those games that contains IF, >, == etc, as well as the game terminals, and then make players out of random trees, and do tournaments between each other

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1:24:30crtp2.cpp: Spec out an idea for bpaf's library, using an operate_type enum with the library ops occupying the high values

1:28:27bpaf How would you pass the information needed to create random operations to the library, from the user, in this framework?

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1:28:27bpaf How would you pass the information needed to create random operations to the library, from the user, in this framework?

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1:28:27bpaf How would you pass the information needed to create random operations to the library, from the user, in this framework?

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1:28:43crtp2.cpp: Spec out CreateRandomOpCallback()

1:31:14Consider library design

1:36:12bpaf The thing I liked about the CRSP approach is that it makes somewhat clear what the "interface" is, you have to implement these methods, and have this data, and I can do the genetic tournament job

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1:36:12bpaf The thing I liked about the CRSP approach is that it makes somewhat clear what the "interface" is, you have to implement these methods, and have this data, and I can do the genetic tournament job

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1:36:12bpaf The thing I liked about the CRSP approach is that it makes somewhat clear what the "interface" is, you have to implement these methods, and have this data, and I can do the genetic tournament job

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1:38:17bpaf Your idea is interesting: you extend the enum. It's not that hard to understand

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1:38:17bpaf Your idea is interesting: you extend the enum. It's not that hard to understand

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1:38:17bpaf Your idea is interesting: you extend the enum. It's not that hard to understand

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1:39:46bpaf Here's a thing, if I want to generate trees for different choices, that need different languages, I use multiple template parameters

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1:39:46bpaf Here's a thing, if I want to generate trees for different choices, that need different languages, I use multiple template parameters

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1:39:46bpaf Here's a thing, if I want to generate trees for different choices, that need different languages, I use multiple template parameters

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1:40:31bpaf By different choices I mean, you could have two choices for a game turn, and you might want to have trees that use terminals that look at different aspects of the game

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1:40:31bpaf By different choices I mean, you could have two choices for a game turn, and you might want to have trees that use terminals that look at different aspects of the game

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1:40:31bpaf By different choices I mean, you could have two choices for a game turn, and you might want to have trees that use terminals that look at different aspects of the game

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1:41:05bpaf For example, imagine a game when you have the choice to play or pass, and if you decide to play you then have to make a move

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1:41:05bpaf For example, imagine a game when you have the choice to play or pass, and if you decide to play you then have to make a move

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1:41:05bpaf For example, imagine a game when you have the choice to play or pass, and if you decide to play you then have to make a move

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1:41:17crtp2.cpp: Spec out a GameStateAllowsMeToDoThese condition

1:42:47bpaf No, the player doesn't generate random operations, the library generates random trees, and evaluates them

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1:42:47bpaf No, the player doesn't generate random operations, the library generates random trees, and evaluates them

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1:42:47bpaf No, the player doesn't generate random operations, the library generates random trees, and evaluates them

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1:43:30bpaf Hehe, yeah, it's complicated

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1:43:30bpaf Hehe, yeah, it's complicated

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1:43:30bpaf Hehe, yeah, it's complicated

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1:43:57On picking the things that your library does and does not do

1:47:49Blackboard: Node Graph Disaster Zone

1:53:28Wind it down

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