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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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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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Rust and C++
https://github.com/cplusplus/draft/releases/download/n4917/n4917.pdf (page 1, chapter 1 scope):
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My programming language history
C/C++
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WG21, aka C++ Standard Committee, May 2022 Mailing
Yes, its actually the "individual papers" link there: https://www.open-std.org/jtc1/sc22/wg21/
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Exactly how expensive is <vector> to include in an embedded environment?
It used to be undefined behaviour for all types, even trivial builtin types like int, until some change in 2020, because it wouldn't start their lifetime, but they have fixed this now, afaik even retroactively for C++17: https://github.com/cplusplus/draft/pull/3765
- Is it possible to buy a physical print copy of the C++20 standard?
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The one and only..
It is written in TeX.
EmbeddedRingBuffer
What are some alternatives?
team - Rust teams structure
LLVMSharp - LLVM bindings for .NET Standard written in C# using ClangSharp
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.
papers
libhal - A collection of interfaces and abstractions for embedded peripherals and devices using modern C++
mirage - MirageOS is a library operating system that constructs unikernels
cppwp - HTML version of the current C++ working paper
rfcs - RFCs for changes to Rust
papers - ISO/IEC JTC1 SC22 WG21 paper scheduling and management
STL - MSVC's implementation of the C++ Standard Library.
gopher-os - A proof of concept OS kernel written in Go
threeify - A Typescript 3D library loosely based on three.js