scnlib
compile-time-regular-expressions
scnlib | compile-time-regular-expressions | |
---|---|---|
18 | 26 | |
955 | 3,181 | |
- | - | |
9.3 | 7.0 | |
8 days ago | 8 days ago | |
C++ | C++ | |
Apache License 2.0 | Apache License 2.0 |
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.
scnlib
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Why are strings and IO so complicated?
scnlib (https://github.com/eliaskosunen/scnlib) scanf
- Reddit++
- Safe and cross platform C++11 alternative to sscanf
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CPM.cmake to make CMake's FetchContent easier
include(FetchContent) FetchContent_Declare( Catch2 GIT_REPOSITORY https://github.com/catchorg/Catch2.git GIT_TAG v3.0.0-preview4 ) FetchContent_Declare( fmt GIT_REPOSITORY https://github.com/fmtlib/fmt.git GIT_TAG 9.1.0 ) FetchContent_Declare( scnlib GIT_REPOSITORY https://github.com/eliaskosunen/scnlib.git GIT_TAG v1.1.2 ) FetchContent_MakeAvailable(Catch2 fmt scnlib)
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[C++20] ClearIO library (unfinished)
Yeah, but parsing format strings in runtime induces an overhead, and doing it in compile time is not trivial, and Iām not sure ClearIO is worth the trouble, since it turns out scnlib exists.
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My AoC2021 solutions in C++
The code is rather nice (in my biased opinion) and makes heavy use of a couple of libraries like scnlib and [Eigen](eigen.tuxfamily.org/). Some things could probably be more optimized but I mainly focused on conciseness. I hope this is useful and I can explain my thought process further if you have any questions.
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what annoys you most while using c++?
I've found https://github.com/eliaskosunen/scnlib but haven't tested it. Maybe that suits your needs for 2.
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The Year is 2022 and the Standard is C++20; what is your preferred way to do Text I/O?
I had a user enum like enum class Color {Red, Green, Blue}; that I wanted to add serialization support for. Following the docs (https://scnlib.readthedocs.io/), after some tweaks I arrived at the following:
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scnlib (scanf for modern C++) - version 1.0 released
Thanks for the comment, I made an issue tracking this: https://github.com/eliaskosunen/scnlib/issues/51
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Modern C++ in Advent of Code
I am using some modern libraries: scnlib fmtlib Eigen and usually abuse lambdas :)
compile-time-regular-expressions
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Why are strings and IO so complicated?
CTRE (https://github.com/hanickadot/compile-time-regular-expressions) ranges::views (filter, transform, etc.) (C++20) str.find() + str.substr() freopen to stdin + cin >> extraction Parser libraries
- Compile time regular expression in C++
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What are thoughts on removing regular expression from the standard library?
There are suggestions that should be replaced by the high performance ctre implementation: https://github.com/hanickadot/compile-time-regular-expressions
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What's the most hilarious use of operator overloading you've seen?
operator"" can be used in a similar way to expression templates (DSLs), where the type of the resulting expression is dependent on the string contents. For example ctre makes use of this to build efficient regular expression parsers, and kumi uses this in conjunction with operator[] to make tuple indexing quite elegant
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It's easy, I swear! Once you learn a bit about it, you'll be amazed!
Check out https://github.com/hanickadot/compile-time-regular-expressions anything is possible š
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Verify all characters are same except a few
Yes to regex, no to std::regex. Better to use CTRE. Something like "^Hello [0-9]+ how are you" should allow checking if there's a match
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Constexpr regex parser!
You could compare your implementation with https://github.com/hanickadot/compile-time-regular-expressions and see if there are any ideas you can copy.
- Regex is comically slow. High performance alternatives? (Pattern matching for validation)
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Regex shootout updated - hyperscan 1st, Rust 2nd, std::regex dead last
std::compile_time_regex would be a nice addition. Something similar to ctre https://github.com/hanickadot/compile-time-regular-expressions Simply letting the compiler generate all the regex parsing machinery at compile time.... And benefitting from compiler optimizations, vectorization, etc...
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What are some cool modern libraries you enjoy using?
ctre
What are some alternatives?
C++ Format - A modern formatting library
RE2 - RE2 is a fast, safe, thread-friendly alternative to backtracking regular expression engines like those used in PCRE, Perl, and Python. It is a C++ library.
gainput - Cross-platform C++ input library supporting gamepads, keyboard, mouse, touch
consteval-huffman - Compile-time Huffman coding compression using C++20
cpp-peglib - A single file C++ header-only PEG (Parsing Expression Grammars) library
xorstr - heavily vectorized c++17 compile time string encryption.
aoc2021 - Advent of Code 2021
neo-fun - Some library components that didn't quite fit anywhere else...
tinyformat - Minimal, type safe printf replacement library for C++
libflow
staticvec - Implements a fixed-capacity stack-allocated Vec alternative backed by an array, using const generics.