id stringlengths 16 145 | text stringlengths 1 179k | title stringclasses 1
value |
|---|---|---|
cpp_utility/cpp_tag_1_2.txt | e if
noexcept") (C++11)
[ as_const ](/w/cpp/utility/as_const "cpp/utility/as const") (C++17)
Common vocabulary types
| [ pair ](/w/cpp/utility/pair "cpp/utility/pair")
---
[ tuple ](/w/cpp/utility/tuple "cpp/utility/tuple") (C++11)
[ optional ](/w/cpp/utility/optional "cpp/utility/optional") (C++17)... | |
cpp_utility/76362_96_0.txt | constexpr auto x = Array[3]; | |
cpp_utility/0eQsx6ip1DwJpli1_212_0.txt | Sign in to report message | |
cpp_utility/0eQsx6ip1DwJpli1_57_0.txt | You do not have permission to delete messages in this group | |
cpp_utility/CanIconstexpranstdar_37_0.txt | Promoted by Roundhouse Provisions
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Matt Jennings
Dramatization only - Roundhouse Provisions
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Updated 1y
What is the best way to keep energy levels high throughout the day?
Just look at the legendary Chuck Norris’s advice since he is now a whopping 81 years old and yet has MORE energy tha... | |
cpp_utility/0eQsx6ip1DwJpli1_275_0.txt | Reply to author | |
cpp_utility/CanIconstexpranstdar_47_0.txt | Promoted by Webflow
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What is the best way to build your own website?
With today’s modern day tools there can be an overwhelming amount of tools to choose from to build your own website. It’s important to keep in mind these considerations when deciding on whi... | |
cpp_utility/0eQsx6ip1DwJpli1_211_0.txt | Report message | |
cpp_utility/76362_126_0.txt | * [ Terms ](https://docs.github.com/site-policy/github-terms/github-terms-of-service)
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cpp_utility/0eQsx6ip1DwJpli1_281_0.txt | Copy link | |
cpp_utility/constexprarraysize_17_0.txt | We have ` constexpr ` , so let’s use it: | |
cpp_utility/constexprarraysize_31_0.txt |
If ` param ` were a reference, the initialization of ` s4 ` would be ill-
formed (for the same reason as previously), but because it’s a value, this is
totally fine. | |
cpp_utility/constexprarraysize_52_0.txt |
As already pointed out, since ` r ` is a reference, ` std::size(r) ` cannot be
a constant expression, so this constraint cannot be made to work. This would
work fine if ` r ` was not a reference (but then we’d be constructing a ` span
` to refer to a range that is about to get destroyed, so this is a
particularly tort... | |
cpp_utility/76362_74_0.txt | The text was updated successfully, but these errors were encountered: | |
cpp_utility/CanIconstexpranstdar_35_0.txt | In the same way C++20 brought constexpr evaluation for std::string and std::vector, we could have had constexpr std::map. | |
cpp_utility/0eQsx6ip1DwJpli1_61_0.txt | Show original message | |
cpp_utility/0eQsx6ip1DwJpli1_79_0.txt | Delete | |
cpp_utility/cpp_classes_5_4.txt | --|---
[ ` __cpp_lib_integer_sequence ` ](/w/cpp/feature_test#cpp_lib_integer_sequence "cpp/feature test") | 201304L | (C++14) | Compile-time integer sequences
### [ [ edit
](/mwiki/index.php?title=cpp/utility/integer_sequence&action=edit§ion=8
"Edit section: Example") ] Example
Note: see _Possible ... | |
cpp_utility/0eQsx6ip1DwJpli1_168_0.txt | Copy link | |
cpp_utility/0eQsx6ip1DwJpli1_23_0.txt | Forward | |
cpp_utility/76362_62_0.txt | Copy link | |
cpp_utility/constexprarraysize_5_0.txt | [ Home ](/) The constexpr array size problem __ | |
cpp_utility/0eQsx6ip1DwJpli1_185_0.txt | Reply to author | |
cpp_utility/0eQsx6ip1DwJpli1_219_0.txt | > > I could re-add "constexpr" to various array methods during a revision. But
> you have to show that said decorator is the best choice. Using the
> "constexpr" decorator forces all implementors to use it for a given method
> from that point on. So you have to show that a given method can be
> implemented as constexp... | |
cpp_utility/0eQsx6ip1DwJpli1_65_0.txt | > Hello,
> I'm playing around with the relaxed constraints on constexpr functions with
> clang + libc++ trunk and noticed something strange with std::array : Because
> std::array lacks a constexpr "reference operator[]" (23.3.2.1.3), it is
> impossible to instantiate an std::array in a constepxr function and write in
>... | |
cpp_utility/76362_45_0.txt | * [ Code ](/llvm/llvm-project)
* [ Issues ](/llvm/llvm-project/issues)
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* [ Actions ](/llvm/llvm-project/actions)
* [ Security ](/llvm/llvm-project/security)
* [ Insights ](/llvm/llvm-project/pulse) | |
cpp_utility/0eQsx6ip1DwJpli1_148_0.txt | Copy link | |
cpp_utility/0eQsx6ip1DwJpli1_227_0.txt | ### Daryle Walker | |
cpp_utility/0eQsx6ip1DwJpli1_239_0.txt | Show original message | |
cpp_utility/0eQsx6ip1DwJpli1_216_0.txt | On Mon, Oct 14, 2013 at 12:06 AM, Daryle Walker < [ dar...@gmail.com ]() >
wrote: | |
cpp_utility/0eQsx6ip1DwJpli1_51_0.txt | Oct 12, 2013, 11:05:21 PM 10/12/13 | |
cpp_utility/76362_109_0.txt | Sorry, something went wrong. | |
cpp_utility/constexprarraysize_26_0.txt | void check(int const (*param)[3]) {
constexpr auto s2 = array_size(param); // error
} | |
cpp_utility/76362_53_0.txt | Open | |
cpp_utility/76362_98_0.txt | All reactions | |
cpp_utility/0eQsx6ip1DwJpli1_115_0.txt | \-- Gaby | |
cpp_utility/0eQsx6ip1DwJpli1_18_0.txt | ### thomas....@gmail.com | |
cpp_utility/0eQsx6ip1DwJpli1_240_0.txt | Either email addresses are anonymous for this group or you need the view
member email addresses permission to view the original message | |
cpp_utility/CanIconstexpranstdar_42_0.txt | constexpr int N = 42;
std::array<int
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Matthew L Reigada
Software Engineer (2014–present)Author has 3.3K answers and 8.7M answer views
·
4y
Related
In C++, should I use a smart pointer to point to an element in an array owned by a std::unique_pointer? Which one?
In C++, should I use a ... | |
cpp_utility/0eQsx6ip1DwJpli1_99_0.txt | Forward | |
cpp_utility/0eQsx6ip1DwJpli1_50_0.txt | unread, | |
cpp_utility/0eQsx6ip1DwJpli1_98_0.txt | Sign in to reply to author | |
cpp_utility/0eQsx6ip1DwJpli1_173_0.txt | to std-dis...@isocpp.org | |
cpp_utility/0eQsx6ip1DwJpli1_30_0.txt | Show original message | |
cpp_utility/0eQsx6ip1DwJpli1_214_0.txt | Either email addresses are anonymous for this group or you need the view
member email addresses permission to view the original message | |
cpp_utility/76362_38_0.txt | [ Sign up
](/signup?ref_cta=Sign+up&ref_loc=header+logged+out&ref_page=%2F%3Cuser-
name%3E%2F%3Crepo-
name%3E%2Fvoltron%2Fissues_fragments%2Fissue_layout&source=header-
repo&source_repo=llvm%2Fllvm-project) | |
cpp_utility/constexprarraysize_65_0.txt | So it’s, at best, a partial and unsatisfying solution. But at least it does
offer a way to reliably get the size of an array as a constant expression -
it’s just that we have to go back to using a macro: | |
cpp_utility/0eQsx6ip1DwJpli1_229_0.txt | Oct 14, 2013, 4:36:19 PM 10/14/13 | |
cpp_utility/cpp_tag_0_1.txt |
[ Three-way comparison ](/w/cpp/utility#Three-way_comparison "cpp/utility")
[ three_way_comparable three_way_comparable_with
](/w/cpp/utility/compare/three_way_comparable "cpp/utility/compare/three way
comparable") (C++20) (C++20)
[ strong_ordering ](/w/cpp/utility/compare/strong_ordering
"cpp/utility/compare/s... | |
cpp_utility/76362_112_0.txt | No one assigned | |
cpp_utility/0eQsx6ip1DwJpli1_274_0.txt | Aug 10, 2014, 10:30:25 PM 8/10/14 | |
cpp_utility/0eQsx6ip1DwJpli1_107_0.txt | Either email addresses are anonymous for this group or you need the view
member email addresses permission to view the original message | |
cpp_utility/0eQsx6ip1DwJpli1_47_0.txt | ` constepxr std :: array < int , 4> sorted_indices = compile_time_sort
< 4 , 6 , 1 , 9 >(); // OK ! ` | |
cpp_utility/76362_115_0.txt | Projects | |
cpp_utility/constexprarraysize_41_0.txt | One of the big features of ` span<T> ` is that all contiguous ranges over ` T
` are convertible to it. This conversion is safe, cheap, and desirable. | |
cpp_utility/76362_119_0.txt | Development | |
cpp_utility/0eQsx6ip1DwJpli1_27_0.txt | Copy link | |
cpp_utility/0eQsx6ip1DwJpli1_241_0.txt | to std-dis...@isocpp.org, thomas....@gmail.com | |
cpp_utility/0eQsx6ip1DwJpli1_151_0.txt | Show original message | |
cpp_utility/0eQsx6ip1DwJpli1_48_0.txt |  | |
cpp_utility/constexprarraysize_82_0.txt | In order to make this example work, we’d need to not only have a reference
propagation rule (to make the ` c_array ` and ` cpp_array ` cases work), but
we’d also need to adopt something like function parameter constraints (see [
P1733 ](https://wg21.link/p1733) and [ P2049 ](https://wg21.link/p2049) , and
my response [... | |
cpp_utility/76362_35_0.txt | To see all available qualifiers, see our [ documentation
](https://docs.github.com/search-github/github-code-search/understanding-
github-code-search-syntax) . | |
cpp_utility/cpp_tag_0_0.txt | ##### [ cppreference.com ](/)
[ Log in
](/mwiki/index.php?title=Special:UserLogin&returnto=cpp%2Futility%2Fpiecewise+construct
"You are encouraged to log in; however, it is not mandatory \[o\]")
##### Namespaces
* [ Page ](/w/cpp/utility/piecewise_construct "View the content page \[c\]")
* [ Discussion ](/w/Ta... | |
cpp_utility/76362_41_0.txt | [ llvm ](/llvm) / **[ llvm-project ](/llvm/llvm-project) ** Public | |
cpp_utility/0eQsx6ip1DwJpli1_105_0.txt | Sign in to report message | |
cpp_utility/cpp_classes_4_2.txt | "cpp/utility/move if
noexcept") (C++11)
[ as_const ](/w/cpp/utility/as_const "cpp/utility/as const") (C++17)
Common vocabulary types
| [ pair ](/w/cpp/utility/pair "cpp/utility/pair")
---
[ tuple ](/w/cpp/utility/tuple "cpp/utility/tuple") (C++11)
[ optional ](/w/cpp/utility/optional "cpp/utility/op... | |
cpp_utility/constexprarraysize_1_0.txt | [ Barry's C++ Blog ](/) | |
cpp_utility/constexprarraysize_33_0.txt | ### Why might we care? __ | |
cpp_utility/0eQsx6ip1DwJpli1_106_0.txt | Show original message | |
cpp_utility/76362_73_0.txt | --- | |
cpp_utility/CanIconstexpranstdar_45_0.txt | The purpose of smart pointers is to embed the concept of ownership into semantics, in order to prevent memory leaks. The only smart pointer type which does not retain ownership of the data it points to is std::weak_ptr, which is specifically for providing weak access to objects owned by an std::shared_ptr. | |
cpp_utility/76362_22_0.txt | Search or jump to... | |
cpp_utility/0eQsx6ip1DwJpli1_70_0.txt | \- Daniel | |
cpp_utility/0eQsx6ip1DwJpli1_138_0.txt |
 | |
cpp_utility/cpp_classes_0_4.txt | termines the common type of two ` pair ` s
(class template specialization) [ [edit]
](https://en.cppreference.com/mwiki/index.php?title=Template:cpp/utility/pair/dsc_common_type&action=edit)
[ std::formatter <std::pair> ](/w/cpp/utility/format/tuple_formatter "cpp/utility/format/tuple formatter") (C++23) | for... | |
cpp_utility/cpp_classes_3_2.txt | noexcept") (C++11)
[ as_const ](/w/cpp/utility/as_const "cpp/utility/as const") (C++17)
Common vocabulary types
| [ pair ](/w/cpp/utility/pair "cpp/utility/pair")
---
[ tuple ](/w/cpp/utility/tuple "cpp/utility/tuple") (C++11)
[ optional ](/w/cpp/utility/optional "cpp/utility/optional") (C++17)
[ ... | |
cpp_utility/0eQsx6ip1DwJpli1_135_0.txt | Constexpr sort-of documents that a function is supposed to work a
certain way, and in doing so may enable the user to forget the more
precise documentation and manual diagnostic work that he still must do.
See the StackOverflow post. The confusion, and code modifications
required for adoption, run deep enough that a lo... | |
cpp_utility/0eQsx6ip1DwJpli1_54_0.txt | Forward | |
cpp_utility/76362_114_0.txt | [ clang:diagnostics ](/llvm/llvm-project/labels/clang%3Adiagnostics)
New/improved warning or error message in Clang, but not in clang-tidy or
static analyzer [ false-negative ](/llvm/llvm-project/labels/false-negative)
[ undefined behaviour ](/llvm/llvm-project/labels/undefined%20behaviour) | |
cpp_utility/constexprarraysize_112_0.txt | Using the [ Jekyll ](https://jekyllrb.com) theme [ Chirpy
](https://github.com/cotes2020/jekyll-theme-chirpy) . | |
cpp_utility/0eQsx6ip1DwJpli1_174_0.txt | On Sun, Oct 13, 2013 at 2:18 AM, David Krauss < [ pot...@gmail.com ]() >
wrote: | |
cpp_utility/0eQsx6ip1DwJpli1_34_0.txt | constexpr int foo ()
{
int i [] = { 1 , 2 , 3 , 4 };
i [ 0 ]= i [ 1 ]; // OK
return i [ 0 ];
} | |
cpp_utility/0eQsx6ip1DwJpli1_246_0.txt | [Just checked that the const -mode access methods are marked constexpr in
N3691.] | |
cpp_utility/constexprarraysize_87_0.txt |
The three calls to ` push_back ` all invoke a function whose signature would
be: | |
cpp_utility/cpp_classes_3_0.txt | ##### [ cppreference.com ](/)
[ Log in
](/mwiki/index.php?title=Special:UserLogin&returnto=cpp%2Futility%2Fpair%2Ftuple+size
"You are encouraged to log in; however, it is not mandatory \[o\]")
##### Namespaces
* [ Page ](/w/cpp/utility/pair/tuple_size "View the content page \[c\]")
* [ Discussion ](/mwiki/inde... | |
cpp_utility/0eQsx6ip1DwJpli1_183_0.txt | unread, | |
cpp_utility/0eQsx6ip1DwJpli1_84_0.txt | Show original message | |
cpp_utility/0eQsx6ip1DwJpli1_269_0.txt | By doing a quick scan of the standard I would say that there is at least two
components where marking all member function constexpr should be fairly non-
controversial :std::array and std::complex | |
cpp_utility/76362_51_0.txt | Jump to bottom | |
cpp_utility/constexprarraysize_69_0.txt | There is no library solution for this, maybe there’s a language one? The
obvious language rule would be to say something like: simply passing around a
reference from one function to another is fine - it’s not until you actually
_need_ the reference for something that we start requiring it to be a valid
constant express... | |
cpp_utility/0eQsx6ip1DwJpli1_231_0.txt | Sign in to reply to author | |
cpp_utility/cpp_tag_0_3.txt | _t ` assume that each
tuple argument becomes the element of a pair. The overloads that use `
std::piecewise_construct_t ` assume that each tuple argument is used to
construct, piecewise, a new object of specified type, which will become the
element of the pair.
### [ [ edit
](/mwiki/index.php?title=cpp/utility/piecew... | |
cpp_utility/0eQsx6ip1DwJpli1_117_0.txt | ### David Krauss | |
cpp_utility/76362_77_0.txt | [
](/dyumin) [ dyumin ](/dyumin) changed the title ~~constexpr std::array out-
of-bounds array index in a constant expression compiles without warnings or
errors~~ constexpr std::array out-of-bounds array ind... | |
cpp_utility/CanIconstexpranstdar_2_0.txt | I have built std::array values at compile time via tail-recu | |
cpp_utility/0eQsx6ip1DwJpli1_40_0.txt | // don't compile
template < int ... i >
std :: array < int , sizeof ...( i )> compile_time_sort ()
{
constepxr int N = sizeof ...( i );
std :: array < int , N > a = { i ...};
for ( int i = 0 ; i < N ; i ++){
// plan was to sort the array here, with classic imperative style
// bu... | |
cpp_utility/constexprarraysize_80_0.txt | f(dynamic_span); // still error! | |
cpp_utility/cpp_classes_1_4.txt |
#include <array>
#include <cstddef>
#include <ranges>
#include <tuple>
#include <utility>
template<class T, [std::size_t](http://en.cppreference.com/w/cpp/types/size_t) Size> struct Arr { T data[Size]; };
// a program-defined specialization of std::tuple_size:
template<class... | |
cpp_utility/76362_100_0.txt | [ 
](/shafik) [ shafik ](/shafik) added the [ undefined behaviour ](/llvm/llvm-
project/labels/undefined%20behaviour) label Dec 27, 2023 | |
cpp_utility/0eQsx6ip1DwJpli1_35_0.txt | constexpr int bar ()
{
auto tup = std :: make_tuple ( 1 , 2 , 3 , 4 );
std :: get < 0 >( tup ) = std :: get < 1 >( tup ); // OK
because T& std::get<I>(tuple) is constexpr !
return std :: get < 0 >( tup );
} |
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