April 30, Online
May 7-12, Aspen, CO, USA
June 24-29, St. Louis, MO, USA
July 2-5, Folkestone, Kent, UK
By Adrien Hamelin | Jan 31, 2022 02:41 PM | Tags: None
The series continue.
constexpr Functions
by Rainer Grimm
From the article:
Today, I continue my story about programming at compile time. After template metaprogramming, the type-traits library, today's topic is constexpr functions in particular...
By Adrien Hamelin | Jan 31, 2022 02:34 PM | Tags: c++17
Did you ever need it?
C++ Templates: How to Iterate through std::tuple: the Basics
by Bartlomiej Filipek
From the article:
If you have a standard container, it’s easy to use a range-based for loop and iterate over its elements at runtime. How about std::tuple? In this case, we cannot use a regular loop as it doesn’t “understand” tuple’s compile-time list of arguments. That’s why in this article, I’ll show you a few techniques you can use to run through all tuple’s entries...
By Adrien Hamelin | Jan 31, 2022 02:24 PM | Tags: advanced
Do you know the conversions?
The Usual Arithmetic Confusions
by Shafik Yaghmour
From the article:
There are a lot of aspects of C++ that are not well understood and lead to all sorts of confusion. The usual arithmetic conversions and the integral promotions are two such aspects. Certain binary operators (arithmetic, relational and spaceship) require their operands to have a common type. The usual arithmetic conversions are the set of steps that gets operands to a common type. While the integral promotions brings integral types smaller than int and unsigned int to either int or unsigned int depending on which one can represent all the values of the source type. This is one of the areas in C++ that comes directly from C, so pretty much all of these examples applies to C as well as C++...
By Meeting C++ | Jan 27, 2022 06:53 AM | Tags: meetingcpp community
An overview on what Meeting C++ plans for 2022:
Meeting C++ in 2022
by Jens Weller
From the article
Giving you a short overview on what Meeting C++ plans for 2022!
The next two events happening at the Meeting C++ online user group:
Also the next Meeting C++ job fair is on the 15th and 16th March, I plan to host one per quarter of each fair.
- February 16th: Design of C++ reflection API with Matúš Chochlík
- February 17th: Meeting C++ book & tool fair
Meeting C++ 2022
Its going to be a hybrid event in Berlin and online from November 16-19th. I'll start the conference season for Meeting C++ again in April, so expect further annoucements and the opening for the call for talks then. Same goes for tickets, sponsorship and more.
Trainings
In February Meeting C++ offers two trainings
Modern C++ Design Patterns by Klaus Iglberger
The big four of C++ 20 by Rainer Grimm
By Adrien Hamelin | Jan 26, 2022 09:45 AM | Tags: intermediate
Which way do you prefer?
Fixing the crash that seems to be on a std::move operation
by Raymond Chen
From the article:
Last time, we looked at a crash that was root-caused to an order of evaluation bug if compiled as C++14. One solution to the problem is to switch to C++17 mode, but presumably the customer isn’t willing to make that drastic a change to their product yet. Maybe there’s something we can do that is less disruptive...
By Adrien Hamelin | Jan 26, 2022 09:39 AM | Tags: advanced
Did it ever happen to you?
The mystery of the crash that seems to be on a std::move operation
by Raymond Chen
From the article:
A customer was encountering a crash that appeared only on the ARM version of their program...
By Adrien Hamelin | Jan 26, 2022 09:32 AM | Tags: c++20
Always more powerful.
How we used C++20 to eliminate an entire class of runtime bugs
by Cameron DaCamara
From the article:
C++20 is here and has been supported in MSVC since 16.11, but today’s post is not about how you can use it, but rather how we used it to effectively eliminate an entire class of runtime bugs by hoisting a check into compile-time. Let’s get right into it!
By philsquared | Jan 25, 2022 12:32 PM | Tags: community
C++ on Sea has opened its Call for Speakers (including workshops), which runs until 6th February
The 2022 Call for Speakers is now open
by C++ on Sea
About the conference
And Early Bird tickets are now selling up to the end of February
Early bird tickets now on sale
This year's event will be back in person, in Folkestone, UK, overlooking the sea!
Speaker's travel and accomodation expenses are covered - so get your submissions in before the deadline.
By Ansel Sermersheim | Jan 25, 2022 11:17 AM | Tags: None
New video on the CopperSpice YouTube Channel:
Auto is Not a Data Type
by Barbara Geller and Ansel Sermersheim
About the video:
Did you think auto was added in C++11? Is auto always used in place of a data type? Watch our new video as we answer these questions and explain how auto interacts with overload resolution and concepts.
Please take a look and remember to subscribe!
By Administrator | Jan 22, 2022 02:49 PM | Tags: None
The 2022-01 mailing of new standards papers is now available.
| WG21 Number | Title | Author | Document Date | Mailing Date | Previous Version | Subgroup |
|---|---|---|---|---|---|---|
| P0447R18 | Introduction of std::hive to the standard library | Matt Bentley | 2021-12-21 | 2022-01 | P0447R17 | SG14 Low Latency,LEWG Library Evolution,All of WG21 |
| P0792R6 | function_ref: a non-owning reference to a Callable | Vittorio Romeo | 2022-01-16 | 2022-01 | P0792R5 | LEWG Library Evolution,LWG Library |
| P1018R14 | C++ Language Evolution status pandemic edition 2021/09–2022/01 | JF Bastien | 2022-01-13 | 2022-01 | P1018R13 | EWG Evolution,All of WG21 |
| P1083R4 | Move resource_adaptor from Library TS to the C++ WP | Pablo Halpern | 2022-01-01 | 2022-01 | P1083R3 | LEWG Library Evolution |
| P1206R7 | Conversions from ranges to containers | Corentin Jabot | 2022-01-21 | 2022-01 | P1206R6 | LWG Library |
| P1240R2 | Scalable Reflection | Daveed Vandevoorde | 2022-01-14 | 2022-01 | P1240R1 | SG7 Reflection |
| P1664R6 | reconstructible_range - a concept for putting ranges back together | JeanHeyd Meneide | 2021-12-25 | 2022-01 | P1664R5 | SG9 Ranges,LEWG Library Evolution |
| P1841R2 | Wording for Individually Specializable Numeric Traits | Walter E Brown | 2022-01-14 | 2022-01 | P1841R1 | LWG Library |
| P1854R3 | Conversion to literal encoding should not lead to loss of meaning | Corentin Jabot | 2022-01-15 | 2022-01 | P1854R2 | EWG Evolution |
| P1885R9 | Naming Text Encodings to Demystify Them | Corentin Jabot | 2022-01-15 | 2022-01 | P1885R8 | LEWG Library Evolution |
| P1899R2 | stride_view | Christopher Di Bella, Tim Song | 2021-12-23 | 2022-01 | P1899R1 | SG9 Ranges,LEWG Library Evolution |
| P2000R3 | Direction for ISO C++ | Daveed Vandevoorde | 2022-01-06 | 2022-01 | P2000R2 | All of WG21,Direction Group |
| P2079R2 | System execution context | Lee Howes | 2022-01-14 | 2022-01 | P2079R1 | SG1 Concurrency and Parallelism,LEWG Library Evolution |
| P2093R12 | Formatted output | Victor Zverovich | 2021-12-20 | 2022-01 | P2093R11 | LWG Library |
| P2165R3 | Compatibility between tuple, pair and tuple-like objects | Corentin Jabot | 2022-01-18 | 2022-01 | P2165R2 | LEWG Library Evolution |
| P2248R4 | Enabling list-initialization for algorithms | Giuseppe D'Angelo | 2022-01-03 | 2022-01 | P2248R3 | SG6 Numerics,SG9 Ranges,LEWG Library Evolution |
| P2249R4 | Mixed comparisons for smart pointers | Giuseppe D'Angelo | 2022-01-11 | 2022-01 | P2249R3 | LEWG Library Evolution |
| P2286R5 | Formatting Ranges | Barry Revzin | 2022-01-15 | 2022-01 | P2286R4 | LEWG Library Evolution |
| P2286R6 | Formatting Ranges | Barry Revzin | 2022-01-19 | 2022-01 | P2286R5 | LEWG Library Evolution |
| P2300R4 | `std::execution` | Michał Dominiak | 2022-01-19 | 2022-01 | P2300R3 | SG1 Concurrency and Parallelism,LEWG Library Evolution |
| P2302R3 | std::ranges::contains | Christopher Di Bella | 2022-01-19 | 2022-01 | P2302R2 | LEWG Library Evolution |
| P2303R4 | Basic lambdas for C | Jens Gustedt | 2021-12-24 | 2022-01 | P2303R3 | SG22 Compatability |
| P2304R3 | Improve type generic programming | Jens Gustedt | 2021-12-24 | 2022-01 | P2304R2 | SG22 Compatability |
| P2305R4 | Type inference for variable definitions and function returns | Jens Gustedt | 2021-12-24 | 2022-01 | P2305R3 | SG22 Compatability |
| P2306R3 | Type-generic lambdas | Jens Gustedt | 2021-12-24 | 2022-01 | P2306R2 | SG22 Compatability |
| P2310R1 | Revise spelling of keywords | Jens Gustedt | 2021-12-31 | 2022-01 | P2310R0 | SG22 Compatability |
| P2311R2 | Make false and true first-class language features | Jens Gustedt | 2021-12-30 | 2022-01 | P2311R1 | SG22 Compatability |
| P2324R2 | Labels at the end of compound statements (C compatibility) | Martin Uecker | 2022-01-14 | 2022-01 | P2324R1 | SG22 Compatability,CWG Core |
| P2363R3 | Extending associative containers with the remaining heterogeneous overloads | Konstantin Boyarinov | 2022-01-19 | 2022-01 | P2363R2 | LEWG Library Evolution |
| P2370R2 | Stacktrace from exception | Andrei Nekrashevich | 2022-01-11 | 2022-01 | P2370R1 | LEWG Library Evolution,LWG Library |
| P2375R1 | Generalisation of nth_element to a range of nths | Johan Lundberg | 2022-01-14 | 2022-01 | P2375R0 | SG9 Ranges,EWG Evolution |
| P2404R1 | Move-only types for equality_comparable_with, totally_ordered_with, and three_way_comparable_with | Justin Bassett | 2021-12-24 | 2022-01 | P2404R0 | SG9 Ranges,LEWGI SG18: LEWG Incubator,LEWG Library Evolution,LWG Library |
| P2404R2 | Move-only types for equality_comparable_with, totally_ordered_with, and three_way_comparable_with | Justin Bassett | 2022-01-19 | 2022-01 | P2404R1 | SG9 Ranges,LEWGI SG18: LEWG Incubator,LEWG Library Evolution,LWG Library |
| P2424R0 | Abbreviated Parameters | Mihail Naydenov | 2022-01-14 | 2022-01 | EWGI SG17: EWG Incubator | |
| P2437R1 | Support for #warning | Aaron Ballman | 2022-01-13 | 2022-01 | P2437R0 | CWG Core |
| P2447R2 | std::span and the missing constructor | Federico Kircheis | 2022-01-21 | 2022-01 | P2447R1 | LEWG Library Evolution |
| P2448R1 | Relaxing some constexpr restrictions | Barry Revzin | 2022-01-15 | 2022-01 | P2448R0 | CWG Core |
| P2457R0 | 2021 December Library Evolution Poll Outcomes | Bryce Adelstein Lelbach | 2022-01-14 | 2022-01 | LEWG Library Evolution | |
| P2458R0 | 2022 January Library Evolution Polls | Bryce Adelstein Lelbach | 2022-01-20 | 2022-01 | LEWG Library Evolution | |
| P2468R2 | The Equality Operator You Are Looking For | Barry Revzin, Bjarne Stroustrup, Cameron DaCamara, Daveed Vandevoorde, Gabriel Dos Reis, Herb Sutter, Jason Merrill, Jonathan Caves, Richard Smith, Ville Voutilainen | 2022-01-14 | 2022-01 | P2468R1 | EWG Evolution,CWG Core |
| P2474R1 | views::repeat | Michał Dominiak | 2022-01-18 | 2022-01 | P2474R0 | SG9 Ranges,LEWG Library Evolution |
| P2494R1 | Relaxing range adaptors to allow for move only types | Michał Dominiak | 2022-01-17 | 2022-01 | P2494R0 | SG9 Ranges,LEWG Library Evolution |
| P2498R1 | Forward compatibility of text_encoding with additional encoding registries | Peter Brett | 2022-01-14 | 2022-01 | P2498R0 | SG16 Unicode,LEWG Library Evolution |
| P2507R1 | Limit [[assume]] to conditional-expressions | Peter Brett | 2022-01-04 | 2022-01 | P2507R0 | EWG Evolution |
| P2508R1 | Exposing std::basic-format-string | Barry Revzin | 2022-01-18 | 2022-01 | P2508R0 | LEWG Library Evolution |
| P2511R0 | Beyond operator(): NTTP callables in type-erased call wrappers | Zhihao Yuan | 2022-01-14 | 2022-01 | LEWG Library Evolution | |
| P2512R0 | SG16: Unicode meeting summaries 2021-06-09 through 2021-12-15 | Tom Honermann | 2021-12-23 | 2022-01 | SG16 Unicode | |
| P2513R0 | char8_t Compatibility and Portability Fixes | JeanHeyd Meneide | 2022-01-09 | 2022-01 | SG16 Unicode,EWG Evolution | |
| P2514R0 | std::breakpoint | René Ferdinand Rivera Morell | 2022-01-02 | 2022-01 | SG15 Tooling,LEWG Library Evolution | |
| P2515R0 | std::is_debugger_present | René Ferdinand Rivera Morell | 2022-01-02 | 2022-01 | SG15 Tooling,LEWG Library Evolution | |
| P2516R0 | string_view is implicitly convertible from what? | Victor Zverovich | 2022-01-07 | 2022-01 | LEWG Library Evolution | |
| P2517R0 | Add a conditional noexcept specification to std::apply | Hewill Kang | 2022-01-14 | 2022-01 | LEWG Library Evolution | |
| P2520R0 | move_iterator should be a random access iterator | Barry Revzin | 2022-01-15 | 2022-01 | LEWG Library Evolution | |
| P2521R0 | Contract support -- Working Paper | Andrzej Krzemieński | 2022-01-17 | 2022-01 | SG21 Contracts | |
| P2523R0 | Request for re-inclusion of std::hive proposal in C++23 | Matt Bentley | 2022-01-14 | 2022-01 | SG14 Low Latency,LEWG Library Evolution | |
| P2524R0 | SG14: Low Latency/Games/Embedded/Finance/Simulation 2020/12/09-2022/01/12 | Michael Wong | 2022-01-15 | 2022-01 | SG14 Low Latency | |
| P2525R0 | SG19: Machine Learning Meeting Minutes 2020/12/10-2022/01/13 | Michael Wong | 2022-01-15 | 2022-01 | SG19 Machine Learning | |
| P2527R0 | std::variant_alternative_index and std::variant_alternative_index_v | Alex Christensen | 2022-01-18 | 2022-01 | LEWGI SG18: LEWG Incubator |