dctwin

5 ms·

1.
by dctwin 23d ago
I just want to say that this is a really great article, probably my favourite explanation of cpp coroutines - thank you
2.
by dctwin 2mo ago
Am I reading this right? Opus + Composer did a comparable job to Fable, at ~1/19th the price, and half the LoC?
3.
by dctwin 5mo ago
The layoffs haven't even really started yet... I'm very worried about the next two years
4.
by dctwin 2y ago
Oh I think I finally groked what you suggested! Something like template <StringLiteral str> static constexpr Key<str> key in the class namespace - I think this this would work, but if I understand this correctly, You would need
5.
by dctwin 2y ago
Whether or not this is useful (I am also not sure), the JSON doesn't need to survive into runtime at all. If you include the JSON, do a bunch of `if constexpr`, and never touch the JSON outside of a constexpr context, it doesn't h
6.
by dctwin 2y ago
Yes, very true. I noticed that even already at 3dp the floats start to compare unequal. The long double helped but it's not really. I googled and found two examples of constexpr float parsing repositories, but from the sounds of things
7.
by dctwin 2y ago
You're right to point out that this is really 'first class JSON', rather than the Pydantic/Jackson type thing where the json barely exists and is immediately transformed into your models and classes. Thanks for reading t
8.
by dctwin 2y ago
The opposite 'toString' problem seems harder - I didn't try, but it should be possible now that std::string is constexpr. I don't think you could parse it with, say, a class that has a std::string member (because of the
9.
by dctwin 2y ago
You can do something similar, no? std::pow is not constexpr (most float stuff is not, presumably due to floating point state) but you can implement 10^x anyway
10.
by dctwin 2y ago
Despite my writing the article I agree
11.
by dctwin 2y ago
Thanks for the idea! Yes constexpr std::vector feels like cheating
12.
by dctwin 2y ago
Yes, the nonconstexpr version does just that, unless I misunderstood your question. See also boost::spirit for a 'big' version of this
13.
by dctwin 2y ago
Hm - so this would instantiate a variable for each key in the class namespace? I admit I haven't seen anything like this but sounds very interesting
14.
by dctwin 2y ago
I was able to do the primitive long double result = 0.0; while (...) { if (json[head] == '.') ... result *= 10; result += json[head] - '0'; } in a constexpr function with no problem :)
15.
by dctwin 2y ago
Yes, I agree. I don't see much practical use in this. I was just surprised how (relatively) straightforwards this is to do, and thought it was more cool than useful
16.
by dctwin 2y ago
Thank you!
17.
Compile-time JSON deserialization in C++(medium.com)
108 points by dctwin 2y ago|88 comments
18.
by dctwin 2y ago
Hello! I wrote this short blog post about using pattern-matching-like template metaprogramming to deserialize JSON at build time - please let me know what you think (especially if you see improvements)
19.
Wavelet Based Features for Automatic Synthesizer Programming(medium.com)
21 points by dctwin 3y ago|0 comments