C++ 中文周刊 第131期

2024-07-30 14:24:13 浏览数 (1)

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标准委员会动态/ide/编译器信息放在这里

编译器信息最新动态推荐关注hellogcc公众号 本周更新 2023-09-06 第218期

文章

std::mdspan for C 23入门[1]

之前也介绍过很多次了

C 编译期多态 - poly 实现剖析[2]

介绍poly的原理

优雅的实现多线程环境下的协程调度 - 再谈 ASIO 与 Coroutine[3]

对ASIO和coroutine 分析很深，值得一看涨涨见识

从无栈协程到C 异步框架[4]

对协程讨论很深，值得一看

现代 C 及其在 ClickHouse 中的应用[5]

讲一些c 的使用。值得一看

基于 eBPF 的内存泄漏（增长）通用分析方法探索[6]

有点意思

Formatting Text in C : The Old and The New Ways[7]

压测了一下几种格式化，format/format_to还是比printf之类的更快的 (还用你说？)

Did you know that C 26 allows constexpr cast from void*[8]

c 26可以硬转const *了

比如

代码语言：javascript复制
struct Animal_View {
    const void *animal;
    std::string_view (*speak_func)(const void *animal);

    template <class Animal>
    Animal_View(const Animal &animal)
        : animal(&animal), speak_func([](const void *animal) {
              return static_cast<const Animal *>(animal)->speak();
          }) {}

    constexpr std::string_view speak() { return speak_func(animal); }
};
Did you know that C 26 added more constexpr for cmath and complex[9]
代码语言：javascript复制
#include <cmath>
constexpr auto positive = std::abs(-2);
static_assert(positive == 2);

没啥说的

Did you know that C 26 added testing for success or failure of functions?[10]

以前to_chars要判断接受两个返回值处理另一个，c 26加一个operator bool

类似这种

代码语言：javascript复制
constexpr std::to_chars_result result{{}};
static_assert(result);
Transcoding Unicode strings at crazy speeds with AVX-512[11]

SIMD时间，其实可以理解成 https://github.com/simdutf/simdutf 的推销帖

Making Gaussian Splats smaller[12]

图像算法的玩意，没看懂

Compile-time sizes for range adaptors[13]
代码语言：javascript复制
template <auto Fn, typename ... Rng>
constexpr auto compute_range_adaptor_size(Rng&&... rng)
{
    if constexpr ((tc::has_constexpr_size<Rng> && ...))
{
        auto constexpr value = Fn(tc::constexpr_size<Rng>()...);
        return std::integral_constant<std::size_t, value>{};
    } else
    {
        auto const value = Fn(tc::size(std::forward<Rng>(rng))...);
        return value;
    }
}

template <typename ... Rng>
struct concat_adaptor
{
    constexpr auto size() const
        requires (tc::has_size<Rng> && ...)
{
        return std::apply([](auto const& ... base_rng) {
            return tc::compute_range_adaptor_size<[](auto const ... n) {
                return (n   ...);
            }>(base_rng...);
        }, base_rng_tuple);
    }
};

我看不懂

Constexpr functions for smaller binary size?[14]

有人发帖说constexpr简化代码能让二进制代码更小，作者反驳

其实主要和优化有关系，和constexpr关系不是很大

Yet Another C Coroutine Tutorial[15]

这哥们写了个库 https://github.com/pfirsich/aiopp/

总结了个教程，手把手教你写task。我觉得还是值得一看的

Small String Optimization (SSO) in C [16]

这个应该没人不知道吧

视频

C Weekly - Ep 393 - C 23's std::unreachable[17]

这玩意没堆栈信息

Exceptions in C : Better Design Through Analysis of Real World Usage - Peter Muldoon - CppNow 2023[18]

值得一看，介绍坑爹execption的方方面面

b站链接 https://www.bilibili.com/video/BV16C4y1f79m/

开源项目需要人手

  • • asteria[19] 一个脚本语言，可嵌入，长期找人，希望胖友们帮帮忙，也可以加群384042845和作者对线
  • • Unilang[20] deepin的一个通用编程语言，点子有点意思，也缺人，感兴趣的可以github讨论区或者deepin论坛看一看。这里也挂着长期推荐了
  • • gcc-mcf[21] 懂的都懂

新项目介绍/版本更新

  • • https://github.com/lemire/simdcomp simd 整数压缩

一些封装liburing的库

https://github.com/pfirsich/aiopp/

https://github.com/cmazakas/fiona

https://github.com/CarterLi/liburing4cpp

https://github.com/pabloariasal/couring 这个还有博客 https://pabloariasal.github.io/2022/11/12/couring-1/ 介绍设计

本文永久链接[22]

如果有疑问评论最好在上面链接到评论区里评论，这样方便搜索，微信公众号有点封闭/知乎吞评论

引用链接

[1] std::mdspan for C 23入门: https://zhuanlan.zhihu.com/p/653155513 [2] C 编译期多态 - poly 实现剖析: https://zhuanlan.zhihu.com/p/654397993 [3] 优雅的实现多线程环境下的协程调度 - 再谈 ASIO 与 Coroutine: https://zhuanlan.zhihu.com/p/654363849 [4] 从无栈协程到C 异步框架: https://zhuanlan.zhihu.com/p/654360600 [5] 现代 C 及其在 ClickHouse 中的应用: https://zhuanlan.zhihu.com/p/655663455 [6] 基于 eBPF 的内存泄漏（增长）通用分析方法探索: https://zhuanlan.zhihu.com/p/652850051 [7] Formatting Text in C : The Old and The New Ways: https://mariusbancila.ro/blog/2023/09/12/formatting-text-in-c-the-old-and-the-new-ways/ [8] Did you know that C 26 allows constexpr cast from void*: https://github.com/tip-of-the-week/cpp/blob/master/tips/345.md [9] Did you know that C 26 added more constexpr for cmath and complex: https://github.com/tip-of-the-week/cpp [10] Did you know that C 26 added testing for success or failure of functions?: https://github.com/tip-of-the-week/cpp/blob/master/tips/346.md [11] Transcoding Unicode strings at crazy speeds with AVX-512: https://lemire.me/blog/2023/09/13/transcoding-unicode-strings-at-crazy-speeds-with-avx-512/ [12] Making Gaussian Splats smaller: https://aras-p.info/blog/2023/09/13/Making-Gaussian-Splats-smaller/ [13] Compile-time sizes for range adaptors: https://www.foonathan.net/2023/09/compile-time-sizes-range-adaptors/ [14] Constexpr functions for smaller binary size?: https://www.sandordargo.com/blog/2023/09/13/constexpr-and-binary-sizes [15] Yet Another C Coroutine Tutorial: https://theshoemaker.de/posts/yet-another-cpp-coroutine-tutorial [16] Small String Optimization (SSO) in C : https://rrmprogramming.com/article/small-string-optimization-sso-in-c/ [17] C Weekly - Ep 393 - C 23's std::unreachable: https://www.youtube.com/watch?v=ohMyb4jPIAQ&ab_channel=C++WeeklyWithJasonTurner [18] Exceptions in C : Better Design Through Analysis of Real World Usage - Peter Muldoon - CppNow 2023: https://www.youtube.com/watch?v=HXJmrMnnDYQ&ab_channel=CppNow [19] asteria: https://github.com/lhmouse/asteria [20] Unilang: https://github.com/linuxdeepin/unilang [21] gcc-mcf: https://gcc-mcf.lhmouse.com/ [22] 本文永久链接: https://wanghenshui.github.io/cppweeklynews/posts/131.html

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