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Expand Up @@ -26,7 +26,7 @@ RSS使用仓库的release RSS [链接](https://github.com/wanghenshui/cppweeklyn
| [二十一](./posts/021.md) | [二十二](./posts/022.md) | [二十三](./posts/023.md) | [二十四](./posts/024.md) | [二十五](./posts/025.md) | [二十六](./posts/026.md) | [二十七](./posts/027.md) | [二十八](./posts/028.md) | [二十九](./posts/029.md) | [三十期](./posts/030.md) |
| [三十一](./posts/031.md) | [三十二](./posts/032.md) | [三十三](./posts/033.md) | [三十四](./posts/034.md) | [三十五](./posts/035.md) | [三十六](./posts/036.md) | [三十七](./posts/037.md) | [三十八](./posts/038.md) | [三十九](./posts/039.md) | [四十期](./posts/040.md) |
| [四十一](./posts/041.md) | [四十二](./posts/042.md) | [四十三](./posts/043.md) | [四十四](./posts/044.md) | [四十五](./posts/045.md) | [四十六](./posts/046.md) | [四十七](./posts/047.md) | [四十八](./posts/048.md) | [四十九](./posts/049.md) | [五十期](./posts/050.md) |
| [五十一](./posts/051.md) | [五十二](./posts/052.md) | [五十三](./posts/053.md) | [五十四](./posts/054.md)| | | | | | |
| [五十一](./posts/051.md) | [五十二](./posts/052.md) | [五十三](./posts/053.md) | [五十四](./posts/054.md)| [五十五](./posts/055.md) | | | | | |



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---
layout: post
title: 第55期
---

# C++ 动态新闻推送 第55期

从[reddit](https://www.reddit.com/r/cpp/)/[hackernews](https://news.ycombinator.com/)/[lobsters](https://lobste.rs/)/[meetingcpp](https://www.meetingcpp.com/blog/blogroll/items/Meeting-Cpp-Blogroll-322.html)摘抄一些c++动态

[周刊项目地址](https://github.com/wanghenshui/cppweeklynews)｜[在线地址](https://wanghenshui.github.io/cppweeklynews/) ｜[知乎专栏](https://www.zhihu.com/column/jieyaren) |[腾讯云+社区](https://cloud.tencent.com/developer/column/92884)

弄了个qq频道，[手机qq点击进入](https://qun.qq.com/qqweb/qunpro/share?_wv=3&_wwv=128&inviteCode=xzjHQ&from=246610&biz=ka)

欢迎投稿，推荐或自荐文章/软件/资源等，请[提交 issue](https://github.com/wanghenshui/cppweeklynews/issues)

本期内容非常少

---

## 资讯

标准委员会动态/ide/编译器信息放在这里

[三月邮件](http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/#mailing2022-03)

把标题简单列一下

| [N4908](https://wg21.link/N4908) | Working Draft, C++ Extensions for Library Fundamentals, Version 3 | Thomas Köppe | 2022-02-19 | 2022-03 | | All of WG21 |
| -------------------------------------- | ------------------------------------------------------------ | ------------------- | ---------- | ------- | -------------------------------------- | --------------------------------------------------------- |
| [N4909](https://wg21.link/N4909) | Editor’s Report: C++ Extensions for Library Fundamentals, Version 3 | Thomas Köppe | 2022-02-19 | 2022-03 | | All of WG21 |
| [N4910](https://wg21.link/N4910) | Working Draft, Standard for Programming Language C++ | Thomas Köppe | 2022-03-17 | 2022-03 | | All of WG21 |
| [N4911](https://wg21.link/N4911) | Editors’ Report - Programming Languages - C++ | Thomas Köppe | 2022-03-17 | 2022-03 | | All of WG21 |
| [P0009R16](https://wg21.link/P0009R16) | MDSPAN | Christian Trott | 2022-03-15 | 2022-03 | [P0009R15](https://wg21.link/P0009R15) | LWG Library |
| [P0957R6](https://wg21.link/P0957R6) | Proxy: A Polymorphic Programming Library | Mingxin Wang | 2022-03-15 | 2022-03 | [P0957R5](https://wg21.link/P0957R5) | LEWGI SG18: LEWG Incubator,LEWG Library Evolution |
| [P1083R5](https://wg21.link/P1083R5) | Move resource_adaptor from Library TS to the C++ WP | Pablo Halpern | 2022-02-24 | 2022-03 | [P1083R4](https://wg21.link/P1083R4) | LEWG Library Evolution |
| [P1684R1](https://wg21.link/P1684R1) | mdarray: An Owning Multidimensional Array Analog of mdspan | Christian Trott | 2022-03-20 | 2022-03 | [P1684R0](https://wg21.link/P1684R0) | LEWG Library Evolution |
| [P1708R6](https://wg21.link/P1708R6) | Simple Statistical Functions | Richard Dosselman | 2022-03-15 | 2022-03 | [P1708R5](https://wg21.link/P1708R5) | SG6 Numerics,SG19 Machine Learning,LEWG Library Evolution |
| [P1839R4](https://wg21.link/P1839R4) | Accessing Object Representations | Krystian Stasiowski | 2022-03-16 | 2022-03 | [P1839R3](https://wg21.link/P1839R3) | CWG Core |
| [P2264R3](https://wg21.link/P2264R3) | Make assert() macro user friendly for C and C++ | Peter Sommerlad | 2022-02-27 | 2022-03 | [P2264R2](https://wg21.link/P2264R2) | SG22 Compatability,LEWG Library Evolution |
| [P2290R3](https://wg21.link/P2290R3) | Delimited escape sequences | Corentin Jabot | 2022-02-25 | 2022-03 | [P2290R2](https://wg21.link/P2290R2) | SG22 Compatability,CWG Core |
| [P2465R3](https://wg21.link/P2465R3) | Standard Library Modules std and std.compat | Stephan T. Lavavej | 2022-03-11 | 2022-03 | [P2465R2](https://wg21.link/P2465R2) | CWG Core,LWG Library |
| [P2510R1](https://wg21.link/P2510R1) | Formatting pointers | Mark de Wever | 2022-03-20 | 2022-03 | [P2510R0](https://wg21.link/P2510R0) | LWG Library |
| [P2511R1](https://wg21.link/P2511R1) | Beyond operator(): NTTP callables in type-erased call wrappers | Zhihao Yuan | 2022-03-15 | 2022-03 | [P2511R0](https://wg21.link/P2511R0) | LEWG Library Evolution |
| [P2521R2](https://wg21.link/P2521R2) | Contract support – Working Paper | Andrzej Krzemieński | 2022-03-15 | 2022-03 | [P2521R1](https://wg21.link/P2521R1) | SG21 Contracts |
| [P2539R0](https://wg21.link/P2539R0) | Should the output of std::print to a terminal be synchronized with the underlying stream? | Victor Zverovich | 2022-03-11 | 2022-03 | | LEWG Library Evolution |
| [P2540R1](https://wg21.link/P2540R1) | Empty Product for certain Views | Steve Downey | 2022-03-14 | 2022-03 | [P2540R0](https://wg21.link/P2540R0) | SG9 Ranges,LEWG Library Evolution |
| [P2553R1](https://wg21.link/P2553R1) | Make mdspan size_type controllable | Christian Trott | 2022-03-15 | 2022-03 | [P2553R0](https://wg21.link/P2553R0) | LEWG Library Evolution,LWG Library |
| [P2555R1](https://wg21.link/P2555R1) | Naming improvements for std::execution | Jens Maurer | 2022-03-13 | 2022-03 | [P2555R0](https://wg21.link/P2555R0) | LEWG Library Evolution |
| [P2558R0](https://wg21.link/P2558R0) | Add @, $, and ` to the basic character set | Steve Downey | 2022-03-16 | 2022-03 | | SG16 Unicode,EWGI SG17: EWG Incubator,SG22 Compatability |
| [P2560R0](https://wg21.link/P2560R0) | Comparing value- and type-based reflection | Matúš Chochlı́k | 2022-02-23 | 2022-03 | | SG7 Reflection |
| [P2562R0](https://wg21.link/P2562R0) | constexpr Stable Sorting | Oliver Rosten | 2022-03-09 | 2022-03 | | LEWG Library Evolution,LWG Library |
| [P2564R0](https://wg21.link/P2564R0) | consteval needs to propagate up | Barry Revzin | 2022-03-14 | 2022-03 | | EWG Evolution |
| [P2565R0](https://wg21.link/P2565R0) | Supporting User-Defined Attributes | Bret Brown | 2022-03-15 | 2022-03 | | SG15 Tooling |
| [P2568R0](https://wg21.link/P2568R0) | Proposal of std::map::at_ptr | Andrew Tomazos | 2022-03-18 | 2022-03 | | LEWG Library Evolution |
| [P2569R0](https://wg21.link/P2569R0) | *_HAS_SUBNORM==0 implies what? | Fred Tydeman | 2022-03-18 | 2022-03 | | SG6 Numerics,SG22 Compatability |

[编译器信息最新动态推荐关注hellogcc公众号 本周更新 2022-03-23 第142期](https://github.com/hellogcc/osdt-weekly/blob/master/weekly-2022/2022-03-23.md)



## 文章

- [c++ tip of week **Did you know that C++23 added `std::to_underlying`?**](https://github.com/QuantlabFinancial/cpp_tip_of_the_week/)

```c++
enum { QL = 42 };

int main() {
std::cout << std::to_underlying(QL); // prints 42
static_assert(typeid(std::to_underlying(QL)) == typeid(unsigned));
}
```

没啥说的

- [A tour of the Rust and C++ interoperability ecosystem ](https://blog.tetrane.com/2022/Rust-Cxx-interop.html)

c++/rust混合编程的一些问题

- [Minimum viable declarative GUI in C++](https://ossia.io/posts/minimum-viable/)

讲UI实现的。看不懂

- [SFINAE, Immediate Context, Operator << and '\n' ](https://www.cppstories.com/2022/sfinea-immediate-context/)

```c++
std::tuple tp { 10, 20, "hello"};
std::cout << tp << '\n'; // << err ??
```
tuple不能这么打印。重载有问题
只好这么写
```c++
template <typename TupleT, std::size_t TupSize = std::tuple_size_v<TupleT>>
std::ostream& operator <<(std::ostream& os, const TupleT& tp) {
return printTupleImp(os, tp, std::make_index_sequence<TupSize>{});
}
```



## 视频

- [C++ Weekly - Ep 316 - What Are `const` Member Functions?](https://www.youtube.com/watch?v=bqd9ILyQRxQ)

没啥说的



## 开源项目需要人手

- [asteria](https://github.com/lhmouse/asteria) 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
- [pika](https://github.com/OpenAtomFoundation/pika) 一个nosql 存储， redis over rocksdb，非常需要人贡献代码胖友们， 感兴趣的欢迎加群294254078前来对线





---

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[本文永久链接](https://wanghenshui.github.io/cppweeklynews/posts/055.html)

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