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1. • • It replaced C11 (standard ISO/IEC 9899:2011), and will be superseded by C23 (ISO/IEC 9899:2023) when it is published in 2024. Since it was under development in 2017, and officially published in 2018, C17 is sometimes referred to as C18. Changes from C11 C17 fixes numerous minor defects in C11 without introducing new language features.
     en.wikipedia.org › wiki › C17_(C_standard_revision)

     C17 (C standard revision) - Wikipedia

2. Top results related to are there new features in c17?

   • Are there code commenting features like DocBlockr in Visual Studio Code?

     Top Answer

     Answered Jun 05, 2018 · 14 votes

     The Visual Studio Code Marketplace now has a doc block extension for JavaScript & others may be added soon. https://marketplace.visualstudio.com/items?itemName=stevencl.addDocComments

     Formerly, it had partial support for this. As mentioned by others, you could get it by typing /** and then ENTER but only if you are in a JavaScript file. I don't believe it works in any other language.

     A few similar features had been requested:

     https://web.archive.org/web/20170910095011/https://visualstudio.uservoice.com/forums/293070-visual-studio-code/suggestions/9417975-intellisense-comments-need-improved-typedoc-and-j

     https://web.archive.org/web/20170910095011/https://visualstudio.uservoice.com/forums/293070-visual-studio-code/suggestions/7899765-automatic-formatting-of-and-documentation

     https://web.archive.org/web/20170910095011/https://visualstudio.uservoice.com/forums/293070-visual-studio-code/suggestions/8248872-true-jsdoc-support-for-ts-and-js

     Check all answers on Stack Overflow

     1/5

   • Are C++20 new atomic_flag features supported in g++ / gcc?

     Top Answer

     Answered Jul 12, 2022 · 5 votes

     atomic<bool> does everything atomic_flag does, just as efficiently on all normal C++ implementations. C++20 just added new stuff to atomic_flag to bring it up to the level of atomic<bool>. atomic_flag is guaranteed to be lock_free, but in practice on all platforms anyone cares about, so is atomic<bool>.

     Don't expect GCC8 to have all the C++2a features; at least try it on https://godbolt.org/ with latest release or nightly gcc. (Also note that it's not the compiler proper that needs to support this, just the standard library headers. But libstdc++ is normally distributed with g++.)

     I tweaked your example so it could be compiled with optimization enabled without optimizing away the actual work.

     #include <atomic>-int flagtest(std::atomic_flag &myFlag) { //std::atomic_flag myFlag = ATOMIC_FLAG_INIT; return myFlag.test();}-

     On the Godbolt compiler explorer with gcc and clang: GCC10.2 doesn't support the new C++20 atomic_flag::test() member function, GCC nightly trunk build does. Clang 11.0 and trunk do, clang 10.0.1 doesn't.

     # GCC trunk for x86-64 -O3 -std=gnu++2aflagtest(std::atomic_flag&): movzx eax, BYTE PTR [rdi] retbooltest(std::atomic<bool>&): movzx eax, BYTE PTR [rdi] test al, al setne al movzx eax, al # this is weird, GCC has gone insane. ret-

     With clang, we can also try libc++ (a new implementation of the C++ standard library). By default, clang on Linux (including Godbolt) uses libstdc++, like GCC does.

     # clang 11.0 -O3 -std=gnu++2a -stdlib=libc++flagtest(std::__1::atomic_flag&): mov al, byte ptr [rdi] movzx eax, al and eax, 1 retbooltest(std::__1::atomic<bool>&): mov al, byte ptr [rdi] movzx eax, al and eax, 1 ret-

     So that's weird and horrible; even if the value in memory might not be booleanized, there's no reason to merge into the low byte of RAX with a byte mov and then movzx eax,al. Just do a movzx load in the first place! (Clang does have a tendency to be reckless with x86 false dependencies in general, but usually it at least saves a byte by using mov instead of movzx, if not a whole xor-zeroing instruction. But here it's costing an extra instruction.)

     But and eax,1 is much less bad than GCC's insane test/setnz/movzx, if it thinks it needs to re-booleanize. (It doesn't actually need to do that; the ABI guarantees that a bool in memory is an actual 0 or 1 byte, and atomic<bool> uses the same object-representation as bool.)

     So with clang, both ways have stupid missed-optimizations converting to int. With GCC for some reason atomic_flag doesn't suffer that problem, but I wouldn't recommend using it just for that reason. Hopefully atomic<bool> will get fixed, and normally you don't convert bool to int.

     Normal uses of atomic<bool>

     or atomic_flag

     , like branching on it, should not have any of these missed optimizations. e.g.

     int g0, g1;int conditional_load(std::atomic<bool> &myFlag) { return myFlag ? g0 : g1;}-

     # gcc 11 nightly build -O3conditional_load(std::atomic<bool>&): movzx eax, BYTE PTR [rdi] test al, al mov eax, DWORD PTR g0[rip] cmove eax, DWORD PTR g1[rip] ret-

     So that's pretty normal. Clang chooses to select between addresses, then load once. That puts the load-use latency on the critical path and takes more instructions; worse choice when both vars are adjacent so probably come from the same cache line. (GCC's choice always touches both vars, could be worse if one could stay "cold" in cache).

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     2/5

   • Are there best/recommended practices to follow when renaming functions in a new version of a package?

     Top Answer

     Answered Nov 22, 2016 · 56 votes

     Even though you are just shortening function names, I would still treat it with the same fanfare as any change to the public API of the package: with deprecation/defunct stages to the old functions as the new functions are brought in.

     In the first phase, for each function you want to shorten the name of (let's call it transmute_my_carefully_crafted_data_structure_into_gold), you keep a function with that signature, but move all the actual code into your newly named function (let's call it alchemy).

     Initially:

     transmute_my_carefully_crafted_data_structure_into_gold <- function(lead, alpha=NULL, beta=3) { # TODO: figure out how to create gold # look like we are doing something Sys.sleep(10) return("gold")}-

     First release with new names:

     transmute_my_carefully_crafted_data_structure_into_gold <- function(lead, alpha=NULL, beta=3) { .Deprecated("alchemy") #include a package argument, too alchemy(lead=lead, alpha=alpha, beta=beta)}-alchemy <- function(lead, alpha=NULL, beta=3) { # TODO: figure out how to create gold # look like we are doing something Sys.sleep(10) return("gold")}-

     So that transmute_my_carefully_crafted_data_structure_into_gold starts as a thin wrapper around alchemy, with an additional .Deprecated call.

     > transmute_my_carefully_crafted_data_structure_into_gold()[1] "gold"Warning message:'transmute_my_carefully_crafted_data_structure_into_gold' is deprecated.Use 'alchemy' instead.See help("Deprecated") > alchemy()[1] "gold"-

     If you make changes to alchemy, it is still carried by transmute_my_carefully_crafted_data_structure_into_gold since that just calls the former. However, you don't change the signature of transmute_my_carefully_crafted_data_structure_into_gold even if alchemy does; in that case you need to map, as well as possible, the old arguments into the new arguments.

     In a later release, you can change .Deprecated to .Defunct.

     > transmute_my_carefully_crafted_data_structure_into_gold()Error: 'transmute_my_carefully_crafted_data_structure_into_gold' is defunct.Use 'alchemy' instead.See help("Defunct")-

     Note that this is an error and stops; it does not go ahead and call alchemy.

     You could, in some later release, delete this function entirely, but I'd leave it in this state as a signpost.

     You mentioned using using roxygen. When you make the first transition to deprecated, you can change the @rdname to package-deprecated, add a line at the beginning of the description saying it is deprecated, add the new function to the @seealso. When it changes to defunct, change the @rdname to package-defunct.

     Check all answers on Stack Overflow

     3/5

   • New Features in Excel 2019 for Windows - What's New in Excel 2019?

     A formula is a mathematical expression that computes a cell’s value. Functions are predefined formulas found in Excel. Based on the values specified as arguments or parameters, functions perform specific calculations in a specific order. For instance, =SUM (C1:C10). This function adds the values from cells C1 to C10. In the math and trigonometry, statistical, engineering, date and time, lookup and reference, logical, and text function categories, several new functions are added. In addition, the Web category is introduced, along with a few Web service features. Some Basic functions in Excel were discovered earlier that can be used to perform basic operations.

     We also have a Statistical function in Excel that can be used in industries and businesses for better and more effective results. 

     Categories of Functions

     Excel functions are classified according to their functionality. If you know the category of the function you’re looking for, you can select it.

     Step 1: Select the FORMULAS tab. The group Function Library appears. The function categories are contained within the group.

      

     Step 2: Navigate to the More Functions tab. More function categories will be shown.

      

     Step 3:...

     Check all answers on Geeksforgeeks

     4/5

   • New Features in Excel 2019 for Windows - What's New in Excel 2019?

     A formula is a mathematical expression that computes a cell’s value. Functions are predefined formulas found in Excel. Based on the values specified as arguments or parameters, functions perform specific calculations in a specific order. For instance, =SUM (C1:C10). This function adds the values from cells C1 to C10. In the math and trigonometry, statistical, engineering, date and time, lookup and reference, logical, and text function categories, several new functions are added. In addition, the Web category is introduced, along with a few Web service features. Some Basic functions in Excel were discovered earlier that can be used to perform basic operations.

     We also have a Statistical function in Excel that can be used in industries and businesses for better and more effective results. 

     Categories of Functions

     Excel functions are classified according to their functionality. If you know the category of the function you’re looking for, you can select it.

     Step 1: Select the FORMULAS tab. The group Function Library appears. The function categories are contained within the group.

      

     Step 2: Navigate to the More Functions tab. More function categories will be shown.

      

     Step 3:...

     Check all answers on Geeksforgeeks

     5/5

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3. People also ask

   Are there new features in C17?

   • So, there are no new features included in C17. The Cppreference (History of C) says: Future development C17 Next minor C language standard revision, will include all accepted C11 defect reports, but no new features. UPDATE:

   c - What is C17 and what changes have been made to the language

   stackoverflow.com/questions/47529854/what-is-c17-and-what-changes-have-been-made-to-the-language

   See all results for this question

   What is a C17 standard?

   • At the time of writing, the C17 standard, officially named ISO/IEC 9899:2018, is the last published C standard. It replaces the C11 standard, does not introduce new features, and fixes defects reported for C11. The __STDC_VERSION__ macro for this standard has the value of 201710L. To compile for a C17 standard, we include the -stdc=17 flag.

   Modern C for Absolute Beginners: A Friendly Introduction to the C

   www.oreilly.com/library/view/modern-c-for/9781484266434/html/502111_1_En_34_Chapter.xhtml

   See all results for this question

   What is the difference between C11 and C17?

   • It replaced C11 (standard ISO/IEC 9899:2011), and will be superseded by C23 (ISO/IEC 9899:2023) when it is published in 2024. Since it was under development in 2017, and officially published in 2018, C17 is sometimes referred to as C18. C17 fixes numerous minor defects in C11 without introducing new language features.

   C17 (C standard revision) - Wikipedia

   en.wikipedia.org/wiki/C17_(C_standard_revision)

   See all results for this question

   Will C++17 be a big change?

   • This question's answers are a community effort. Edit existing answers to improve this post. It is not currently accepting new answers or interactions. C++17 is now feature complete, so unlikely to experience large changes. Hundreds of proposals were put forward for C++17.

   c++ - What are the new features in C++17? - Stack Overflow

   stackoverflow.com/questions/38060436/what-are-the-new-features-in-c17

   See all results for this question

4. stackoverflow.com › questions › 47529854c - What is C17 and what changes have been made to the ...

   stackoverflow.com › questions › 47529854

   • Cached

   Nov 28, 2017 · C17 Next minor C language standard revision, will include all accepted C11 defect reports, but no new features. UPDATE: 2018: C17 (ISO/IEC 9899:2018) ( ISO Store) ( Final draft ) Includes the deprecation of ATOMIC_VAR_INIT and the fixes to the following defect reports:

   • According to GCC reference, C17 is actually a bug-fix version of the C11 standard with DR resolutions integrated. C17, a bug-fix version of the C1...
   • C17 is a “bugfix release” of the C standard how "M.S Chaudhari" noticed. However, there is very useful information prepared by Jens Gustedt the aut...

5. stackoverflow.com › questions › 38060436c++ - What are the new features in C++17? - Stack Overflow

   stackoverflow.com › questions › 38060436

   • Cached

   • Language Features
   • Library Additions
   • Removed
   • Papers Not Yet Integrated Into Above
   • Further Reference

   Templates and Generic Code

   1. Template argument deduction for class templates 1.1. Like how functions deduce template arguments, now constructors can deduce the template arguments of the class 1.2. http://wg21.link/p0433r2 http://wg21.link/p0620r0 http://wg21.link/p0512r0 2. template 2.1. Represents a value of any (non-type template argument) type. 3. Non-type template arguments fixes 4. template typename bob> struct foo {} 5. ( Folding + ... + expressions ) and Revisions 6. auto x{8}; is an in...

   Lambda

   1. constexpr lambdas 1.1. Lambdas are implicitly constexpr if they qualify 2. Capturing *this in lambdas 2.1. [*this]{ std::cout << could << " be " << useful << '\ '; }

   Attributes

   1. [[fallthrough]], [[nodiscard]], [[maybe_unused]]attributes 2. [[attributes]] on namespaces and enum { erator[[s]] } 3. using in attributesto avoid having to repeat an attribute namespace. 4. Compilers are now required to ignore non-standard attributes they don't recognize. 4.1. The C++14 wording allowed compilers to reject unknown scoped attributes.

   See full list on stackoverflow.com

   Data types

   1. std::variant 1.1. Almost-always non-empty last I checked? 1.2. Tagged union type 1.3. {awesome|useful} 2. std::optional 2.1. Maybe holds one of something 2.2. Ridiculously useful 3. std::any 3.1. Holds one of anything (that is copyable) 4. std::string_view 4.1. std::stringlike reference-to-character-array or substring 4.2. Never take a string const&again. Also can make parsing a bajillion times faster. 4.3. "hello world"sv 4.4. constexpr char_traits 5. std::byte off more than they c...

   Invoke stuff

   1. std::invoke 1.1. Call any callable (function pointer, function, member pointer) with one syntax. From the standard INVOKE concept. 2. std::apply 2.1. Takes a function-like and a tuple, and unpacks the tuple into the call. 3. std::make_from_tuple, std::applyapplied to object construction 4. is_invocable, is_invocable_r, invoke_result 4.1. http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0077r2.html 4.2. http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0604r0.html 4.3. Deprec...

   File System TS v1

   1. [class.path] 2. [class.filesystem.error] 3. [class.file_status] 4. [class.directory_entry] 5. [class.directory_iterator] and [class.recursive_directory_iterator] 6. [fs.ops.funcs] 7. fstreams can be opened with paths, as well as with const path::value_type*strings.

   See full list on stackoverflow.com

   register, keyword reserved for future use

   bool b; ++b;

   trigraphs

   ios aliases

   See full list on stackoverflow.com

   P0505R0(constexpr chrono)

   P0418R2(atomic tweaks)

   P0512R0(template argument deduction tweaks)

   P0490R0(structured binding tweaks)

   See full list on stackoverflow.com

   papers grouped by year; not all accepted

   https://isocpp.org/files/papers/p0636r0.html

   See full list on stackoverflow.com

6. Videos

   • 

     0:37

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     C17 walks round

     Sep 26, 2022

     43.9K Views

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     3:34

     youtube.com

     What's INSIDE a Boeing C-17 Globemaster...

     Jun 19, 2018

     152.9K Views

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     youtube.com

     USAF C-17 Globemaster III Capabilities Demo

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7. en.cppreference.com › w › cC17 - cppreference.com

   en.cppreference.com › w › c

   • Cached

   Apr 5, 2022 · C17. ISO/IEC 9899:2018, a.k.a. C17 / C18 (denote the year of completion and publication respectively), is the current revision of the C standard. C17 is same as C11, except that it bumps the __STDC_VERSION__ predefined macro to 201710L, contains several defect reports, and deprecates some features.

8. en.wikipedia.org › wiki › C17_(C_standard_revision)C17 (C standard revision) - Wikipedia

   en.wikipedia.org › wiki › C17_(C_standard_revision)

   • Cached

   t. e. C17 is the informal name for ISO/IEC 9899:2018, [1] a standard for the C programming language, prepared in 2017 and published in June 2018. It replaced C11 (standard ISO/IEC 9899:2011), [2] and will be superseded by C23 (ISO/IEC 9899:2023) when it is published in 2024. [3] .

9. www.aerotime.aero › articles › boeing-c-17-globeC-17 Globemaster III: history, features, and performance

   www.aerotime.aero › articles › boeing-c-17-globe

   • Cached

   Sep 8, 2023 · Performance specifications. Variants. The C-17 Globemaster III has given rise to various versions and modifications over the years, including specialized models for medical evacuation (MEDEVAC). These variants have enhanced its utility and adaptability in different mission scenarios, as follows: C-17A: The original military airlift version.

   • Crew: 2 pilots and 1 loadmaster
   • Specs: C-17A

   • Length: 174 ft (53 m)
   • Wingspan: 169.9 ft (51.75 m)

10. www.geeksforgeeks.org › features-of-c17-with-examplesFeatures of C++ 17 - GeeksforGeeks

    www.geeksforgeeks.org › features-of-c17-with-examples

    • Cached

    Nov 20, 2021 · Some of the features introduced in C++17 are: Nested Namespaces. Variable declaration in if and switch. if constexpr statement. Structured bindings. Fold Expressions. Direct list initialization of enums. Nested Namespaces.

11. www.oreilly.com › library › view34. The C17 Standard - Modern C for Absolute Beginners: A ...

    www.oreilly.com › library › view

    • Cached

    Slobodan Dmitrović 1. (1) Belgrade, Serbia. At the time of writing, the C17 standard, officially named ISO/IEC 9899:2018, is the last published C standard. It replaces the C11 standard, does not introduce new features, and fixes defects reported for C11. The __STDC_VERSION__ macro for this standard has the value of 201710L.