CppCon 2017: Arthur O'Dwyer “dynamic_cast From Scratch”

CppCon.org
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Presentation Slides, PDFs, Source Code and other presenter materials are available at: github.com/Cpp...
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This session will introduce you to the C++ object model: the rules by which C++ class objects are translated into memory layouts. We'll quickly cover polymorphic class types and multiple and virtual inheritance. We'll discuss the anatomy of a virtual method call, the difference between `static_cast` and `reinterpret_cast`, and what's contained in a vtable besides function pointers. We'll see that the way `dynamic_cast` thinks about the class hierarchy is slightly different from the way we're used to drawing it; and that `dynamic_cast` is expensive enough that sometimes we can find cheaper ways to ask an object for its type! The climax will be a complete, bug-free, and fast implementation of C++'s built-in `dynamic_cast`, using our own hand-crafted artisanal run-time type information (RTTI).
Attendees will incidentally be exposed to several features of the modern C++ language, including type traits and the `final` qualifier.
This session will mostly be talking about the Itanium C++ ABI, which is the standard on Linux and OS X systems. Mapping these concepts to the MSVC ABI will be left as an exercise for the reader of the project's GitHub repo: github.com/Quu...
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Arthur O'Dwyer: Core Engineering, Nominum
Arthur O'Dwyer worked for many years at Green Hills Software, making the world's most optimizing C and C++ compilers. Now he works at Nominum in San Francisco. Arthur is the showrunner of the Bay Area C++ meetup, which meets practically every week these days.
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Videos Filmed & Edited by Bash Films: www.BashFilms.com
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Register Now For CppCon 2022: cppcon.org/reg...
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[@mrlithium69]

This may have been the first time this subject has felt like it finally clicked!

[@weezytweezy9209]

Great talk, Arthur O'Dwyer is an awesome speaker and gave great examples.

[@ecosta]

Amazing talk and an extra kudos to the CC team. I had it "on" for no reason, but the quality is outstanding! 24:43 surprised me with the [from V] - that's some good human attention of detail there!

[@CppCon]

Much appreciated!

[@Raattis]

Good explanation, well presented, great subtitles. Inheritance was a mistake.

[@hl2mukkel]

What a great speaker! Haha truly entertaining and well explained talk, love that guy!

[@GevorgHovhannisyan-v2o]

This was an awesome talk... perfect👌

[@gevorghovhannisyan5179]

This was an awesome talk 👌

[@rocknroooollllll]

Hey, Arthur -- great talk! But I am intrigued to know what was the ]noisy' talk next door about?

[@user-pp4gh4gb2w]

I'm just happy I've never asked mom to buy an animal

[@robbie_]

I'm only at 2 minutes and I'm already struggling. Not all animals have legs. Cats have one tail. Most animals don't speak English.

[@paherbst524]

Nice work

[@deciuscaeciliusmetellus7197]

Amazing talk, thanks :)

[@AcrossSmart]

Explanation is not clear

[@ВасилийПетров-л1й]

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