expected
C++ Format
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expected
- Functional Programming in Modern C++: The Imperatives Must Go ā Victor Ciura [video]
- Functional exception-less error handling with C++23's optional and expected
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C++23's New Fold Algorithms - C++ Team Blog
On this topic Sy Brand is a guarantee, in fact he did the https://github.com/TartanLlama/expected and several presentation of the subject.
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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.
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ADSP Episode 114: Rust, Val, Carbon, ChatGPT & Errors with Barry Revzin!
Sy Brand's tl::expected
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Daily bit(e) of C++ | Error handling
expected is my favourite little part of cpp23, Iām using it often in codebase with https://github.com/TartanLlama/expected š
- Noticing the the difference in coding when going back to C++
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What are some cool modern libraries you enjoy using?
outcome and/or expected
- Do you use builder pattern?
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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.
https://github.com/TartanLlama/expected
C++ Format
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C++ left arrow operator (2016)
Continuation passing monads form the basis of a perfectly valid and usable software architecture and programming pattern.
In the case of ostream and operator<<, this pattern reduces the number of intermediate objects that would otherwise be constructed.
If you object to iostream on religious or stylistic grounds, there's always fmt which is more like Go or Python string interpolation.[0]
0. https://fmt.dev
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C++ Game Utility Libraries: for Game Dev Rustaceans
GitHub repo: fmtlib/fmt
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Creating k-NN with C++ (from Scratch)
cmake_minimum_required(VERSION 3.5) project(knn_cpp CXX) # Set up C++ version and properties include(CheckIncludeFileCXX) check_include_file_cxx(any HAS_ANY) check_include_file_cxx(string_view HAS_STRING_VIEW) check_include_file_cxx(coroutine HAS_COROUTINE) set(CMAKE_CXX_STANDARD 20) set(CMAKE_BUILD_TYPE Debug) set(CMAKE_CXX_STANDARD_REQUIRED ON) set(CMAKE_CXX_EXTENSIONS OFF) # Copy data file to build directory file(COPY ${CMAKE_CURRENT_SOURCE_DIR}/iris.data DESTINATION ${CMAKE_CURRENT_BINARY_DIR}) # Download library usinng FetchContent include(FetchContent) FetchContent_Declare(matplotplusplus GIT_REPOSITORY https://github.com/alandefreitas/matplotplusplus GIT_TAG origin/master) FetchContent_GetProperties(matplotplusplus) if(NOT matplotplusplus_POPULATED) FetchContent_Populate(matplotplusplus) add_subdirectory(${matplotplusplus_SOURCE_DIR} ${matplotplusplus_BINARY_DIR} EXCLUDE_FROM_ALL) endif() FetchContent_Declare( fmt GIT_REPOSITORY https://github.com/fmtlib/fmt.git GIT_TAG 7.1.3 # Adjust the version as needed ) FetchContent_MakeAvailable(fmt) # Add executable and link project libraries and folders add_executable(${PROJECT_NAME} main.cc) target_link_libraries(${PROJECT_NAME} PUBLIC matplot fmt::fmt) aux_source_directory(lib LIB_SRC) target_include_directories(${PROJECT_NAME} PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}) target_sources(${PROJECT_NAME} PRIVATE ${LIB_SRC}) add_subdirectory(tests)
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Optimizing the unoptimizable: a journey to faster C++ compile times
Good catch, thanks! Fixed now. This explains why the difference was kinda low compared to another benchmark: https://github.com/fmtlib/fmt?tab=readme-ov-file#compile-tim....
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Learn Modern C++
> This is from C++23, right?
std::println is, yes.
> I wonder how available this is within compilers
https://en.cppreference.com/w/cpp/compiler_support says clang, gcc, and msvc all support it, though I don't know how recent those versions are off the top of my head.
In my understanding, with this specific feature, if you want a polyfill for older compilers, or to use some more cutting-edge features that haven't been standardized yet, https://github.com/fmtlib/fmt is available to you.
- The C++20 Naughty and Nice List for Game Devs
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For processing strings, streams in C++ can be slow
{fmt} has internal buffering but it's not yet exposed to users. There is a feature request for it: https://github.com/fmtlib/fmt/issues/2354. FILE buffering is not too bad but it can be easily optimized: https://www.zverovich.net/2020/08/04/optimal-file-buffer-siz....
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adoption of fmt based logging
Automatic use of operator<< when that exists was present in fmt until version 9.0.0. In version 9 you could use FMT_DEPRECATED_OSTREAM to opt in the old behaviour, but this too was removed in version 10.0.0. Now there is no way to automatically use operator<<.
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What's your favorite c++20 feature that should've been there 10 years ago?
You can install it https://github.com/fmtlib/fmt
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Codebases to read
Additionally, if you like low level stuff, check out libfmt (https://github.com/fmtlib/fmt) - not a big project, not difficult to understand. Or something like simdjson (https://github.com/simdjson/simdjson).
What are some alternatives?
libCat - šāā¬ A runtime for C++26 w/out libC or POSIX. Smaller binaries, only arena allocators, SIMD, stronger type safety than STL, and value-based errors!
spdlog - Fast C++ logging library.
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++.
Better Enums - C++ compile-time enum to string, iteration, in a single header file
cpp-libp2p - C++17 implementation of libp2p
ZXing - ZXing ("Zebra Crossing") barcode scanning library for Java, Android
Thrust - [ARCHIVED] The C++ parallel algorithms library. See https://github.com/NVIDIA/cccl
FastFormat - The fastest, most robust C++ formatting library
magnum - Lightweight and modular C++11 graphics middleware for games and data visualization
ZBar - Clone of the mercurial repository http://zbar.hg.sourceforge.net:8000/hgroot/zbar/zbar
stb - stb single-file public domain libraries for C/C++
Scintilla