cmake-init-vcpkg-example
Folly
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cmake-init-vcpkg-example | Folly | |
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19 | 90 | |
8 | 27,072 | |
- | 1.0% | |
4.7 | 9.8 | |
14 days ago | 2 days ago | |
CMake | C++ | |
- | Apache License 2.0 |
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cmake-init-vcpkg-example
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Clang-tidy ignore third party
If your dep is not on any of those, then you can write your own port with vcpkg very easily like this.
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How would you create/maintain a new c++ project using modern tools/practices?
Are they only on git(hub)? You can write a vcpkg overlay port (example) or use FetchContent if the projects are FetchContent ready in a way that doesn't force FetchContent on people trying to build the project (example).
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CMake/Make problem when compiling C++
Take a look at cmake-init, vcpkg and this example that shows how to pull dependencies from git(hub) using vcpkg's overlay ports.
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How to download libraries with vcpkg?
cs50 doesn't appear to be present in the MS repo. No problem, you can write your own overlay port. You can find an example for that here: https://github.com/friendlyanon/cmake-init-vcpkg-example
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Managing Newlib as a Project Dependency
You can take a look at vcpkg or Conan. Maybe vcpkg could be simpler here, because overlay ports are simpler to write than setting up Artifactory for Conan.
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Best way to manage dependencies with c++?
Conan and vcpkg are the only options. I use them both, depends on what kinds of dependencies I want to pull. vcpkg is easier to setup custom one-off dependencies with using overlay ports, while Conan is faster at things if your profile fits one that has a pre-built binary in CCI. Both are trivial to integrate with a CMake project, see these examples for Conan and vcpkg.
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Libraries
Here is an example that shows you how to write your own ports for libraries that don't have one provided by vcpkg. The alternative is doing it manually, but eh.
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CMakePresets.json and vcpkg based GitHub Action workflows for C++
As part of the cmake-init examples I also have an example showing vcpkg integration with a CMake project with exact instructions on what that takes, which also involves CI.
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Barbarian, an open and distributed Conan package index!
Overlay ports.
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Problem with imported library
IMPORTED targets have directory scope, they aren't global like the other target types. Depending on what your project's type is and how it's used, the correct answer can vary from just requiring a path to be passed on the CLI to proper package management usage (e.g. vcpkg)
Folly
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Ask HN: How bad is the xz hack?
https://github.com/facebook/folly/commit/b1391e1c57be71c1e2a...
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Backdoor in upstream xz/liblzma leading to SSH server compromise
https://github.com/facebook/folly/pull/2153
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A lock-free ring-buffer with contiguous reservations (2019)
To set a HP on Linux, Folly just does a relaxed load of the src pointer, release store of the HP, compiler-only barrier, and acquire load. (This prevents the compiler from reordering the 2nd load before the store, right? But to my understanding does not prevent a hypothetical CPU reordering of the 2nd load before the store, which seems potentially problematic!)
Then on the GC/reclaim side of things, after protected object pointers are stored, it does a more expensive barrier[0] before acquire-loading the HPs.
I'll admit, I am not confident I understand why this works. I mean, even on x86, loads can be reordered before earlier program-order stores. So it seems like the 2nd check on the protection side could be ineffective. (The non-Linux portable version just uses an atomic_thread_fence SeqCst on both sides, which seems more obviously correct.) And if they don't need the 2nd load on Linux, I'm unclear on why they do it.
[0]: https://github.com/facebook/folly/blob/main/folly/synchroniz...
(This uses either mprotect to force a TLB flush in process-relevant CPUs, or the newer Linux membarrier syscall if available.)
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Appending to an std:string character-by-character: how does the capacity grow?
folly provides functions to resize std::string & std::vector without initialization [0].
[0] https://github.com/facebook/folly/blob/3c8829785e3ce86cb821c...
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Can anyone explain feedback of a HFT firm regarding implementation of SPSC lock-free ring-buffer queue?
My implementation was quite similar to Boost's spsc_queue and Facebook's folly/ProducerConsumerQueue.h.
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A Compressed Indexable Bitset
> How is that relevant?
Roaring bitmaps and similar data structures get their speed from decoding together consecutive groups of elements, so if you do sequential decoding or decode a large fraction of the list you get excellent performance.
EF instead excels at random skipping, so if you visit a small fraction of the list you generally get better performance. This is why it works so well for inverted indexes, as generally the queries are very selective (otherwise why do you need an index?) and if you have good intersection algorithms you can skip a large fraction of documents.
I didn't follow the rest of your comment, select is what EF is good at, every other data structure needs a lot more scanning once you land on the right chunk. With BMI2 you can also use the PDEP instruction to accelerate the final select on a 64-bit block: https://github.com/facebook/folly/blob/main/folly/experiment...
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Defer for Shell
C++ with folly's SCOPE_EXIT {} construct:
https://github.com/facebook/folly/blob/main/folly/ScopeGuard...
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Is there any facebook/folly community for discussion and Q&A?
Seems like github issues taking a long time to get any response: https://github.com/facebook/folly
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How a Single Line of Code Made a 24-Core Server Slower Than a Laptop
Can't speak for abseil and tbb, but in folly there are a few solutions for the common problem of sharing state between a writer that updates it very infrequently and concurrent readers that read it very frequently (typical use case is configs).
The most performant solutions are RCU (https://github.com/facebook/folly/blob/main/folly/synchroniz...) and hazard pointers (https://github.com/facebook/folly/blob/main/folly/synchroniz...), but they're not quite as easy to use as a shared_ptr [1].
Then there is simil-shared_ptr implemented with thread-local counters (https://github.com/facebook/folly/blob/main/folly/experiment...).
If you absolutely need a std::shared_ptr (which can be the case if you're working with pre-existing interfaces) there is CoreCachedSharedPtr (https://github.com/facebook/folly/blob/main/folly/concurrenc...), which uses an aliasing trick to transparently maintain per-core reference counts, and scales linearly, but it works only when acquiring the shared_ptr, any subsequent copies of that would still cause contention if passed around in threads.
[1] Google has a proposal to make a smart pointer based on RCU/hazptr, but I'm not a fan of it because generally RCU/hazptr guards need to be released in the same thread that acquired them, and hiding them in a freely movable object looks like a recipe for disaster to me, especially if paired with coroutines https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2020/p05...
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Ask HN: What are some of the most elegant codebases in your favorite language?
Not sure if it's still the case but about 6 years ago Facebook's folly C++ library was something I'd point to for my junior engineers to get a sense of "good" C++ https://github.com/facebook/folly
What are some alternatives?
CPM.cmake - 📦 CMake's missing package manager. A small CMake script for setup-free, cross-platform, reproducible dependency management.
abseil-cpp - Abseil Common Libraries (C++)
steam-runtime - A runtime environment for Steam applications
Boost - Super-project for modularized Boost
conan-center-index - Recipes for the ConanCenter repository
Seastar - High performance server-side application framework
CMake - Mirror of CMake upstream repository
parallel-hashmap - A family of header-only, very fast and memory-friendly hashmap and btree containers.
Jenkins - Jenkins automation server
EASTL - Obsolete repo, please go to: https://github.com/electronicarts/EASTL
gentoo - [MIRROR] Official Gentoo ebuild repository
OpenFrameworks - openFrameworks is a community-developed cross platform toolkit for creative coding in C++.