63 lines
5.1 KiB
Plaintext
63 lines
5.1 KiB
Plaintext
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[video member=cmuratori stream_platform=twitch stream_username=handmade_hero project=chat title="CRTP and Library Design" vod_platform=youtube id=EhtxDXlrJ6Y annotator=Miblo]
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[0:08][Recap yesterday's graphics driver crash and determine to set up an external streaming system]
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[4:20][Invite questions and suggestions]
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[6:38][@vaualbus][How do you write a program that is graphics driver crash aware?]
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[8:36][Install and run Process Explorer, and consider graphics driver crashes[ref
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site="Microsoft"
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page="Process Explorer v16.21"
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url="https://docs.microsoft.com/en-us/sysinternals/downloads/process-explorer"]]
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[14:37][Making your app graphics card crash proof: 1) Always check for valid contexts]
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[15:45][Making your app graphics card crash proof: 2) Use fault handlers]
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[16:28][How OBS could handle faults, just protect and flush the stream on crash]
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[17:25][Shutting down gracefully and relaunching your application]
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[18:40][@crazy_coder456][How many episodes remaining, estimate?]
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[19:39][@sgtrumbi][Do you use C++ features like templates? Do you use polymorphism in your own projects?]
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[22:47][@bpaf][What do you think about the CRTP to do polymorphism?[ref
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site="Wikipedia"
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page="Curiously recurring template pattern"
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url=https://en.wikipedia.org/wiki/Curiously_recurring_template_pattern]]
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[25:18][crtp.cpp: Curiously recurring template pattern]
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[27:28][crtp.cpp: The template<struct Something> syntax]
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[31:29][Consider ramifications of templates]
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[34:40][crtp.cpp: Using a union in a parent struct to contain entity types]
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[37:10][crtp.cpp: C++'s "struct entity_ghost \: public entity" inheritance syntax]
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[40:59][crtp.cpp: Consider ramifications of the inheritance model]
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[45:42][crtp.cpp: Making the derived class more primal]
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[50:06][Polymorphic copy construction, virtual functions and the copy constructor[ref
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site="Wikipedia"
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page="Curiously recurring template pattern"
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url=https://en.wikipedia.org/wiki/Curiously_recurring_template_pattern]]
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[56:44][crtp.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()]
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[1:00:20][crtp2.cpp: Attempt this in a C++ way]
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[1:04:03][crtp2.cpp: Run-time type information[ref
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site="Wikipedia"
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page="Run-time type information"
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url="https://en.wikipedia.org/wiki/Run-time_type_information"]]
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[1:09:34][crtp2.cpp: Virtual function call for Clone() in the structs]
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[1:11:08][crtp2.cpp: Base class containing a pure virtual function for cloning, and a shape_cloner templatised struct]
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[1:14:57][@bpaf][I didn't want to use virtual functions, so when I found this I was super happy]
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[1:15:46][Polymorphic chaining[ref
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site="Wikipedia"
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page="Curiously recurring template pattern"
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url=https://en.wikipedia.org/wiki/Curiously_recurring_template_pattern]]
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[1:20:18][@bpaf][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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[1:21:56][@bpaf][You got it, I have to call them back]
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[1:22:17][@bpaf][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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[1:23:27][@bpaf][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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[1:24:30][crtp2.cpp: Spec out an idea for bpaf's library, using an operate_type enum with the library ops occupying the high values]
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[1:28:27][@bpaf][How would you pass the information needed to create random operations to the library, from the user, in this framework?]
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[1:28:43][crtp2.cpp: Spec out CreateRandomOpCallback()]
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[1:31:14][Consider library design]
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[1:36:12][@bpaf][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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[1:38:17][@bpaf][Your idea is interesting: you extend the enum. It's not that hard to understand]
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[1:39:46][@bpaf][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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[1:40:31][@bpaf][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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[1:41:05][@bpaf][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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[1:41:17][crtp2.cpp: Spec out a GameStateAllowsMeToDoThese condition]
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[1:42:47][@bpaf][No, the player doesn't generate random operations, the library generates random trees, and evaluates them]
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[1:43:30][@bpaf][Hehe, yeah, it's complicated]
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[1:43:57][On picking the things that your library does and does not do]
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[1:47:49][Blackboard: Node Graph Disaster Zone]
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[1:53:28][Wind it down]
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[/video]
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