STL
C++ Format
STL | C++ Format | |
---|---|---|
8 | 161 | |
12 | 19,350 | |
- | 1.0% | |
9.4 | 9.7 | |
6 days ago | 5 days ago | |
C++ | C++ | |
GNU General Public License v3.0 or later | 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.
STL
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C++20 Modules Status Report
As a reminder (you've probably seen this, but maybe not everyone), I am still accepting bug bash reports, if anyone is super excited about trying out the code.
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Why is MSVC so much faster at implementing new features?
There are indeed bugs, but it's getting close to handling the entire Standard Library. I'm still accepting STL Modules Bug Bash reports, if you can find novel bugs (see the tracking issue microsoft/STL#1694 for known bugs).
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Why the hell are headers still a thing after all these years?!
Standard Library Modules are coming soon. You can experiment with them (and report issues) by following the instructions at https://github.com/StephanTLavavej/STL/wiki/Standard-Library-Modules-Bug-Bash .
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MSVC Backend Updates for VS2022 17.3
C++23 Standard Library Modules were just officially accepted into the Working Paper. My bug bash for the implementation-in-progress was successful, with many great bugs reported (and most worked around, to the limit of my ability in the library). VS 2022 17.4 Preview 1, released today, contains more fixes for named modules. I'm now close to having a PR prepared for review - just need to add automated testing and do some setup work (as we need to ship a new directory with new files). I can't promise anything yet, but I am very tentatively hopeful that we'll be able to merge this for 17.5.
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Fun times with MSVC <functional>
Agreed - I'm running the Standard Library Modules Bug Bash until end of day today, but I'll continue to accept bug reports afterwards (and will hopefully have time to create a full PR for modules soon).
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Do you think template classes will ever be able to be split into .h and .cpp files?
They should! If you use MSVC as one of your compilers, can you try my upcoming implementation of Standard Library Modules? My bug bash is running for another week, and getting bug reports will help us fix issues in the compiler and library so modules will be usable sooner. (That is, bugs that affect import std; will likely affect people writing their own named modules too.)
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Among the C++20 characteristics you use, what has had the biggest impact on performance improvement?
If you use MSVC, can you help me test them in the modules bug bash I'm running for the next 2 weeks?
- Standard Library Modules Bug Bash
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?
HMake - C++ build system that uses C++ for build configuration.
spdlog - Fast C++ logging library.
STL - MSVC's implementation of the C++ Standard Library.
Better Enums - C++ compile-time enum to string, iteration, in a single header file
Instantiator - Clang based tool to automatically insert all needed explicit instantiations in implementation files for `c++` projects
ZXing - ZXing ("Zebra Crossing") barcode scanning library for Java, Android
modules-report
FastFormat - The fastest, most robust C++ formatting library
carbon-lang - Carbon Language's main repository: documents, design, implementation, and related tools. (NOTE: Carbon Language is experimental; see README)
ZBar - Clone of the mercurial repository http://zbar.hg.sourceforge.net:8000/hgroot/zbar/zbar
Scintilla
HTTP Parser - http request/response parser for c