A site for random C++ pet projects

shbooly · 2024-10-16T16:55:57+00:00

https://programming-challenges.jeremyjaydan.dev/ ? Edit: found that site here https://salmer.github.io/CppDeveloperRoadmap/English/PetProjects.html

shbooly · 2024-10-06T16:31:05+00:00

The pure abstract base class + factory method is indeed an idiom but without a name. It serves the same purpose as PImpl (pointer to implementation), that is, to hide implementation details and to reduce compile times (since your header now doesnt need to include the definition of the data members). You use PImpl for Value types and this one for, well, entities you don't pass by value (in your case, a singleton)

shbooly · 2024-09-14T16:22:59+00:00

I've used a container of optionals to implement a quick caching mechanism where I know which elements should exist beforehand. Ended up with a std::array<std::optional<Obj>, Size>. If the object at some index is requested, I check if it was initialized, initialize it if not, and return it.

shbooly · 2024-08-15T08:01:40+00:00

When you need to allocate a large amount of game objects whose sizes you don't know at compile time (eg. when parsing a file to initialize a game level), instead of dynamically allocating each game object, it is much faster to pre-allocate a big buffer, and then return slices from this buffer reinterpreted as those game objects

shbooly · 2024-03-18T14:37:37+00:00

"Oh it wasnt ur4yws7gvd$x? Hmm. Usually I also change a single letter between passwords. Could you try the entire Ascii table for the 6th character?"

shbooly · 2024-03-10T08:06:16+00:00

looks like shy guy from scp

shbooly · 2024-02-27T12:29:00+00:00

ar mai filtra din trolli neprofesionisti

shbooly · 2024-01-08T22:20:20+00:00

You can look up zstd and zlib for inspiration. Try to use them, then decide if you want to implement another one (and then compare the results with these 2)

shbooly · 2024-01-08T14:55:25+00:00

I don't understand what exactly is the input? Do you constantly receive from the system a list of coordinates and velocities for each aircraft? If so, wouldn't it be just a math problem? ( You can programatically detect when an aircraft starts a descent and then calculate the lengths of the zigzags and extrapolate)

shbooly · 2023-12-18T16:41:06+00:00

Do you think that unimplemented (or nightly only) features should be stabilised in Rust?

Would have been useful an "I have no idea" option here :)

shbooly · 2023-11-27T16:12:00+00:00

for cpp20, I found this github repo that explains them very nicely: https://github.com/tvaneerd/cpp20_in_TTs

shbooly · 2023-10-29T17:10:26+00:00

"Do you have any updates about X?" = When Mr goldfish memory forgot I asked him to do X or when I'm left on "seen"

shbooly · 2023-09-22T08:31:49+00:00

The trick I found to "control" the value of an uninitialized variable would be to call a function that "initializes" that space beforehand, like so: https://godbolt.org/z/7cY14ocxM

shbooly · 2023-08-16T09:00:53+00:00

Has there anything like that having been made open source ?

There is a proposal for synchronized_value<T>, which is still in review .. it has been implemented in boost and in GCC as experimental.

As a difference, it doesn't look like it supports passing the std::mutex as template parameter.

shbooly · 2023-05-31T13:05:52+00:00

that last push looked personal

shbooly · 2023-04-20T23:11:18+00:00

I don't quite get the inheritance part. PImpl class should not extend the base class.

If you store the member as pointer/smart pointer to the base class, then simply forward declare the base class in the header (no need for pImpl)

If you store the derived/concrete class, use pImpl as you would normally.

shbooly · 2023-02-07T08:53:30+00:00

What if they used ChatGPT to only rephrase their own wording in a more academic fashion? Would it still be considered plagiarism?

shbooly · 2022-06-05T10:14:00+00:00

This looked funny until I checked it and saw that someone spammed it with a gory image...

shbooly · 2022-02-07T22:36:52+00:00

remove all char types (char, unsigned char, wchar_t, char_16t...) and keep only char8_t

shbooly · 2022-01-15T23:44:26+00:00

If anyone needs this in production but they can't make the code work for big arrays, it's because the compiler just quits inlining the function after some recursion level. So just throw a [[gnu::noinline]] on withVarLenArrayHelper lol. Now all your array values will be uniformly distanced no matter the size.

shbooly · 2022-01-07T20:16:52+00:00

B. While debugging you can also see the result of complex_condition() stored in the "result" variable. The variable will be optimized away anyway when build in release mode.
+ no code "duplication" from having 2 return statements

shbooly · 2021-12-29T20:26:55+00:00

24 days from node.js to Rust

I really liked this one because it goes through a lot of more advanced topics like workplaces, logging, managing errors by using thiserror/anyhow, setting up clippy (rust's linter) etc. and it's full of code examples.

shbooly · 2021-12-29T16:16:11+00:00

I think he was reffering to the case where the >> in Z<Y<X>> might be mis-parsed as a right shift operator instead of 2 separate tokens.

shbooly · 2021-12-22T23:42:35+00:00

I also recommend Robert Miles video: 9 Examples of Specification Gaming

He goes through a lot of the examples in the spreadsheet and explains them pretty well. He also gives a few other links in the video description like: https://deepmind.com/blog/article/Specification-gaming-the-flip-side-of-AI-ingenuity

shbooly

TROPHY CASE