expected
cpp-libp2p
Our great sponsors
expected | cpp-libp2p | |
---|---|---|
18 | 1 | |
1,378 | 326 | |
- | 3.4% | |
2.1 | 6.0 | |
3 months ago | 15 days ago | |
C++ | C++ | |
Creative Commons Zero v1.0 Universal | 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.
expected
- Functional Programming in Modern C++: The Imperatives Must Go – Victor Ciura [video]
- Functional exception-less error handling with C++23's optional and expected
-
What is the status of the monadic operations for std::expected? It seems like they made it into the standard for C++23, but they don't actually seem to be available in the std::expected implementation (in MSVC's STL)
In the meantime, I may use the TartanLlama implementation (here) and plan around replacing it with the real deal in the near future.
-
What are some cool modern libraries you enjoy using?
outcome and/or expected
- Do you use builder pattern?
-
Why should I have written ZeroMQ in C, not C++ (2012)
Eventually you'll be able to use std::expected in C++23!
https://en.cppreference.com/w/cpp/header/expected
Don't throw exceptions, require the caller to handle errors and propagate them up the stack (everything returns an expected) if they cannot be handled. You are forced to model the error domains instead of just throwing an exception and assuming the caller knows to catch it and do something with it.
Java has checked exceptions, but, Kotlin decided to abandon them.
The nice codebases I have worked on stick to the Result type in Swift or Kotlin. And thus you are forced to 'translate' errors (exceptions?) as described in Alan Griffith's 'Exceptional Java'.
https://accu.org/journals/overload/10/48/griffiths_406/
"If a checked exception is thrown (to indicate an operation failure) by a method in one package it is not to be propagated by a calling method in a second package. Instead the exception is caught and "translated". Translation converts the exception into: an appropriate return status for the method, a checked exception appropriate to the calling package or an unchecked exception recognised by the system. (Translation to another exception type frequently involves "wrapping".)"
If you can't wait for C++23, there's a single header implementation here.
-
Exceptions: Yes or No?
Exception is part of std, (ex. in std::vector constructor). Exceptions should be used in the "everything is lost" situation. In a situation where exceptions are not activated, the overhead is close to zero. For the rest there is expected (https://github.com/TartanLlama/expected)
-
Throw exception if returned error code is ignored
hmm, well had std::expected been standardised, i would have suggested that. if the op is ok, perhaps this might be worth checking out?
There is a proposal for std::expected that contains either a value or an error type. It has a rich interface that allows a wide variety of uses and can prevent lots of duplicated error-checking code. Sy Brand has created a working implementation. code docs
-
ES.20: Always initialize an object
Also worth to check this implementation in my opinion: https://github.com/TartanLlama/expected
cpp-libp2p
-
Do you use builder pattern?
No, I don't. I use boost::outcome. As defined here https://github.com/libp2p/cpp-libp2p/blob/master/include/libp2p/outcome/outcome.hpp.
What are some alternatives?
libCat - 🐈⬛ A runtime for C++23 w/out libC or POSIX. Smaller binaries, only arena allocators, SIMD, stronger type safety than STL, and value-based errors!
AECforWebAssembly - A port of ArithmeticExpressionCompiler from x86 to WebAssembly, so that the programs written in the language can run in a browser. The compiler has been rewritten from JavaScript into C++.
doctest - The fastest feature-rich C++11/14/17/20/23 single-header testing framework
serenity - The Serenity Operating System 🐞
magnum - Lightweight and modular C++11 graphics middleware for games and data visualization
PEGTL - Parsing Expression Grammar Template Library
Thrust - [ARCHIVED] The C++ parallel algorithms library. See https://github.com/NVIDIA/cccl
stb - stb single-file public domain libraries for C/C++
C++ Format - A modern formatting library
Experimental Boost.DI - C++14 Dependency Injection Library
kagome - Kagome - C++20 implementation of Polkadot Host