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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
cppfront
- Show HN: a Rust Based CLI tool 'imgcatr' for displaying images
- Cpp2 and cppfront – An experimental 'C++ syntax 2' and its first compiler
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C++ Safety, in Context
https://github.com/hsutter/cppfront
But his side project at Microsoft didn't gain traction with gcc, clang, etc and everybody else in the industry. So at this point, the C++ committee will be perceived as "so far behind" ... because there's nothing for them to vote on.
- Cppfront: Experimental C++ Syntax 2 –> Syntax 1 compiler
- Odin Programming Language
- Cppfront
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C++ Should Be C++
C++ has major flaws that cannot be rectified without serious breaking changes. With that said, Herb has been experimenting with a new cpp frontend with sane defaults [1].
In my opinion, the world is on standby until Anders Hejlsberg feels like tackling a modern, next generation systems language.
[1] https://github.com/hsutter/cppfront
- Why is the committee so reluctant to add new features to the language itself instead of stuffing them into the STL?
- C++ Lambda Idioms [video]
- Toward a TypeScript for C++"
What are some alternatives?
team - Rust teams structure
carbon-lang - Carbon Language's main repository: documents, design, implementation, and related tools. (NOTE: Carbon Language is experimental; see README)
LLVMSharp - LLVM bindings for .NET Standard written in C# using ClangSharp
jakt - The Jakt Programming Language
papers
serenity - The Serenity Operating System 🐞
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.
zig - General-purpose programming language and toolchain for maintaining robust, optimal, and reusable software.
cppwp - HTML version of the current C++ working paper
exotracker-cpp
libhal - A collection of interfaces and abstractions for embedded peripherals and devices using modern C++
LoopModels - "Full speed or nothing." - James Hetfield