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第55期

C++ 中文周刊 第55期

从reddit/hackernews/lobsters/meetingcpp摘抄一些c++动态

周刊项目地址｜在线地址 ｜知乎专栏 |腾讯云+社区

欢迎投稿，推荐或自荐文章/软件/资源等，请提交 issue

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

把标题简单列一下

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

文章

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

c++/rust混合编程的一些问题

讲UI实现的。看不懂

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

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

没啥说的

开源项目需要人手

  • 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753302367和作者对线

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