fast_float
carbon-lang
fast_float | carbon-lang | |
---|---|---|
15 | 174 | |
1,282 | 32,232 | |
1.9% | 0.4% | |
8.7 | 9.8 | |
about 2 months ago | 2 days ago | |
C++ | C++ | |
Apache License 2.0 | GNU General Public License v3.0 or later |
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
fast_float
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Parquet: More than just “Turbo CSV”
> Google put in significant engineering effort into "Ryu", a parsing library for double-precision floating point numbers: https://github.com/ulfjack/ryu
It's not a parsing library, but a printing one, i.e., double -> string. https://github.com/fastfloat/fast_float is a parsing library, i.e., string -> double, not by Google though, but was indeed motivated by parsing JSON fast https://lemire.me/blog/2020/03/10/fast-float-parsing-in-prac...
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What do number conversions (from string) cost?
For those that don't know, gcc 12.x updated its float parsing logic to something similar to fast_float and it's about 1/6 of the cost presented here (sub 100 in the graph presented here). Strongly suggest using that library or upgrading the compiler if you need the performance.
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Can sanitizers find the two bugs I wrote in C++?
This makes sense for integers but betware floating point from_chars - libc++ still doesn't implement it and libstdc++ implements it by wrapping locale-dependent libc functions which involves temporarily changing the thread locale and possibly memory allocation to make the passed string 0-terminated. IMO libstdc++'s checkbox "solution" is worse than not implementing it at all - user's are better off using Lemire's API-compatible fast_float implementation [0].
[0] https://github.com/fastfloat/fast_float
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Passing Programs To A Stack Machine
I'm a bit stuck on how to do the same thing in c++, due to containers only having a single type. The very inefficient way I'm currently doing it is by passing a program as a vector of strings, and then converting the string constants to doubles with the fast_float library.
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Parsing can become accidentally quadratic because of sscanf
Just above this comment is a merged PR, which references fast_float library: https://github.com/fastfloat/fast_float
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Making Rust Float Parsing Fast: libcore Edition
Daniel Lemire @lemire (creator of the algorithm, author of the C++ implementation, and provided constant feedback to help guide the PR).
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RapidObj v0.1 - A fast, header-only, C++17 library for parsing Wavefront .obj files.
And out of 6,000 lines in the file, at least 3000 are other people's code: earcut for polygon triangulation and fast_float because .obj files typically contain a lot of floating point numbers so it's important to parse them quickly.
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First release of dragonbox, a fast float-to-string conversion algorithm, is available
How this compares to https://github.com/fastfloat/fast_float ?
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Why is std::from_chars<float> slow?
I tried to compare it against Daniel Lemire's excellent fast_float library. Fast float took about 180ms for the same program, and all I did was change "std" namespace prefix to "fast_float". It's a factor of 12 difference, at least my machine. I tried MSVC next, and it is a lot better, but it is still ~4 times slower than fast float. AFAIK, clang currently does not implement the feature at all.
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Iterator invalidation of std::string_view
If you don't mind a 3rd party lib until your stdlib updates, https://github.com/fastfloat/fast_float is best-in-class.
carbon-lang
- Carbon Copy Newsletter No.2
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Cpp2 and cppfront – An experimental 'C++ syntax 2' and its first compiler
The roadmap for Carbon [0] mentions wanting to have basic, non-trivial programs written in Carbon by the end of 2024. They're aiming for a v0.1 release in 2025. If it gains traction, they're aiming for a v1.0 beyond 2027.
I don't think anyone outside Google will seriously adopt this before it reaches v1.0. Even within Google, they may choose other options.
[0] - https://github.com/carbon-language/carbon-lang/blob/trunk/do...
- Carbon Language Newsletter, the Carbon Copy, February 2024
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Odin Programming Language
Carbon was started by Chandler Carruth, at Google, but they wanted to move it to broader governance quickly. It's not under the Google GitHub today, but its own org.
https://github.com/carbon-language/carbon-lang/blob/trunk/do...
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C++ Should Be C++
What do you think about Carbon[1]? I am hopeful.
[1] https://github.com/carbon-language/carbon-lang
- The NSA advises move to memory-safe languages
- Carbon Language: An experimental successor to C++
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Toward a TypeScript for C++"
https://github.com/carbon-language/carbon-lang/blob/trunk/do...
next year 0.1 will be usable, 1.0 is about 3 years away, sigh, back to my rust fight
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Programming Languages Every Developer Should Watch Out For
1. Carbon
What are some alternatives?
dragonbox - Reference implementation of Dragonbox in C++
rust - Empowering everyone to build reliable and efficient software.
rapidobj - A fast, header-only, C++17 library for parsing Wavefront .obj files.
crubit
C++ Format - A modern formatting library
cppfront - A personal experimental C++ Syntax 2 -> Syntax 1 compiler
fast-float-rust - Super-fast float parser in Rust (now part of Rust core)
Odin - Odin Programming Language
RapidJSON - A fast JSON parser/generator for C++ with both SAX/DOM style API
go - The Go programming language
simdutf8 - SIMD-accelerated UTF-8 validation for Rust.
hylo - The Hylo programming language