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cppwp
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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
cppwp
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Can sanitizers find the two bugs I wrote in C++?
Current C++ standard draft it hosted at https://eel.is/c++draft/, at this time this is the draft for C++23.
For earlier C++ standard versions the final drafts before ISO standardization are hosted at https://github.com/timsong-cpp/cppwp . The paid ISO standardized version is supposedly not meaningfully different.
Relevant parts of the standard:
* pop_back: https://timsong-cpp.github.io/cppwp/n4868/containers#tab:con... "Preconditions: a.empty() is false."
* Meaning of "precondition": https://timsong-cpp.github.io/cppwp/n4868/library#structure....
Reading the standard can be quite a challenge. The standard tries to not repeat itself, which often means that you don't get your answer in a self-contained paragraph, but you have to hunt down cross-references and definitions.
As a C++ language reference I highly recommend https://en.cppreference.com .
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Question about terminology of classes
See https://github.com/timsong-cpp/cppwp for a list of the last (or first after) working draft for each standard version.
- Is it possible to buy a physical print copy of the C++20 standard?
What are some alternatives?
team - Rust teams structure
fast_float - Fast and exact implementation of the C++ from_chars functions for number types: 4x to 10x faster than strtod, part of GCC 12 and WebKit/Safari
LLVMSharp - LLVM bindings for .NET Standard written in C# using ClangSharp
serenity - The Serenity Operating System 🐞
papers
rust - Empowering everyone to build reliable and efficient software.
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.
STL - MSVC's implementation of the C++ Standard Library.
libhal - A collection of interfaces and abstractions for embedded peripherals and devices using modern C++
cppreference-doc - C++ standard library reference
mirage - MirageOS is a library operating system that constructs unikernels
carbon-lang - Carbon Language's main repository: documents, design, implementation, and related tools. (NOTE: Carbon Language is experimental; see README)