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gopher-os
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draft
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C++23: The Next C++ Standard
I should have said the "latest standard", not "spec", if we're being technical. But EVERY bit of official material is very clear about asserting that C++23 is still a preview/in-progress, not a standard. Saying otherwise is, strictly speaking, incorrect.
https://isocpp.org/std/the-standard
https://www.iso.org/standard/79358.html
https://github.com/cplusplus/draft/blob/main/papers/n4951.md
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Never trust a programmer who says they know C++
[3] https://github.com/cplusplus/draft/releases/tag/n4917
*This is a joke, but only barely so.
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How to become a C++ Chad ?
pdf
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Why is the token "designator brace-or-equal-initializer" not defined in the C++ 20 standard document?
I'm currently going through Annex A of C++20, but I can't find the definition of "designator brace-or-equal-initializer", and couldn't find much formal information on it in an obvious way. The newest source on [decl] (https://github.com/cplusplus/draft/blob/main/source/declarations.tex) also doesn't seem to have it. Am I missing anything, or is this a missing definition in the standard grammar?
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Can sanitizers find the two bugs I wrote in C++?
> I don't have a copy of the standard at hand, can anyone quote the relevant section?
The C++ (draft) standard is on GitHub! [0] Compiling it needs Perl and some LaTeX packages, but is reasonably straightforwards otherwise. In addition, links to specific draft standards can be found on cppreference [1].
But anyways, in the first C++20 post-publication draft (N4868), the wording you're interested in is in multiple sections. Section 22.2.3 Sequence Containers [sequence.reqmts] has Table 78: Optional sequence container operations [tab:container.seq.opt] (starting on page 815), which states that a precondition of pop_back() is that empty() returns false. Section 16.3.2.4 Detailed Specifications [structure.specifications] (page 481) states:
> Preconditions: the conditions that the function assumes to hold whenever it is called; violation of any preconditions results in undefined behavior.
Therefore, calling pop_back() on an empty vector results in undefined behavior.
> Is this something that in practice is implemented in different (exception-throwing) ways?
Based on a quick glance at the major implementations (libc++ 15.0.7 at [2], MSVC at [3], libstdc++ at [4]), it looks like asserts are used. Whether those result in exceptions probably depends on whether the asserts are compiled in in the first place and how they are implemented, but it's definitely not a guaranteed exception.
[0]: https://github.com/cplusplus/draft
[1]: https://en.cppreference.com/w/cpp/links
[2]: https://github.com/llvm/llvm-project/blob/llvmorg-15.0.7/lib...
[3]: https://github.com/llvm/llvm-project/blob/8dfdcc7b7bf66834a7...
[4]: https://gcc.gnu.org/git/?p=gcc.git;a=blob;f=libstdc%2B%2B-v3...
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How does Rust handle bounds checks that are incorrect in C/C++ due to signed integer conversion?
Which standard specifically are you quoting there? I checked an old and a new C++ draft in https://github.com/cplusplus/draft/tree/main/papers, and in neither one did 6.3 have anything like that.
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Rust and C++
https://github.com/cplusplus/draft/releases/download/n4917/n4917.pdf (page 1, chapter 1 scope):
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WG21, aka C++ Standard Committee, October 2022 Mailing
PRs for C++ are at https://github.com/cplusplus/draft But the discussion for a PR is via https://isocpp.org/std/submit-a-proposal
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My programming language history
C/C++
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How to overload function parameter to accept either raw pointer or c-array
By the way, https://github.com/cplusplus/draft/releases/tag/n4910 , says
gopher-os
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If I know neither Go or Rust, which do I choose to learn first/only?
But there are other brave people exists like biscuit or gopher-os who can do it :)))
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Can Go be used for kernel development?
Can it? Yes. Should it? Now that’s up for debate.
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The one and only..
golang? https://github.com/gopher-os/gopher-os
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random question from a beginner, has anyone written an OS in Go?
I'm sure it would be a fun proof of concept, and there seem to be some projects like https://github.com/gopher-os/gopher-os , but they themselves admit it's just a proof of concept. Every tool has its use.
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Go is a nice improvement over C and C++, and it doesn't make me feel dirty like Java does.
I’m pretty the C in the the OS is just the libc that is used for user programs and not part of the actual kernel. There is also gopherOS which contains no C at all. My only point was that it is possible to write one in Go and that Go can be used for low level coding. And I don’t believe you can write an OS in pure python bc it isn’t compiled
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Wow that feels real good
Wait. You're not who we asked for
What are some alternatives?
team - Rust teams structure
serenity - The Serenity Operating System 🐞
LLVMSharp - LLVM bindings for .NET Standard written in C# using ClangSharp
eggos - A Go unikernel running on x86 bare metal
papers
router7 - router7 is a small home internet router completely written in Go. It is implemented as a gokrazy appliance.
Asciidoctor - :gem: A fast, open source text processor and publishing toolchain, written in Ruby, for converting AsciiDoc content to HTML 5, DocBook 5, and other formats.
Cosmos - Cosmos is an operating system "construction kit". Build your own OS using managed languages such as C#, VB.NET, and more!
cppwp - HTML version of the current C++ working paper
Harbol - Harbol is a collection of data structures and miscellaneous libraries, similar in nature to C++'s Boost, STL, and GNOME's GLib; it is meant to be a smaller and more lightweight collection of data structures, code systems, and convenience software.
libhal - A collection of interfaces and abstractions for embedded peripherals and devices using modern C++
biscuit - Biscuit research OS