id stringlengths 16 145 | text stringlengths 1 179k | title stringclasses 1
value |
|---|---|---|
cpp_utility/76362_72_0.txt | jfyi
` constexpr int Array[] = {1, 2}; ` produces compillation error ` error: array
index 3 is past the end of the array (that has type 'const int[2]')
[-Werror,-Warray-bounds] ` as expected. | |
cpp_utility/constexprarraysize_88_0.txt | void push_back(std::span<int, 5> const&); | |
cpp_utility/76362_107_0.txt | --- | |
cpp_utility/0eQsx6ip1DwJpli1_225_0.txt | > \--
>
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cpp_utility/0eQsx6ip1DwJpli1_206_0.txt | Forward | |
cpp_utility/76362_123_0.txt | ## Footer | |
cpp_utility/76362_106_0.txt | According to compiler explorer msvc just gives up on constant expression and
moves everything into runtime with a warning. Which is not great but still
better than clang and gcc which just generate nothing. | |
cpp_utility/constexprarraysize_81_0.txt |
Even if we say that we can propagate references to our heart’s delight during
constant evaluation, as long as we don’t read them, that wouldn’t help us
here. ` dynamic_span ` is a dynamic ` span ` , its ` size() ` member function
is non-static, so we very much do need to read through the reference. | |
cpp_utility/constexprarraysize_74_0.txt | template <typename T, size_t Extent>
struct span {
template <range R>
span(R&& r)
requires (std::size(r) == Extent);
}; | |
cpp_utility/76362_116_0.txt | None yet | |
cpp_utility/0eQsx6ip1DwJpli1_169_0.txt | Report message | |
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cpp_utility/76362_99_0.txt | Sorry, something went wrong. | |
cpp_utility/76362_127_0.txt | You can’t perform that action at this time. | |
cpp_utility/0eQsx6ip1DwJpli1_249_0.txt |  | |
cpp_utility/76362_75_0.txt | All reactions | |
cpp_utility/0eQsx6ip1DwJpli1_203_0.txt | Oct 14, 2013, 3:18:18 PM 10/14/13 | |
cpp_utility/CanIconstexpranstdar_40_0.txt | const int pid = getpid(); // ok; `pid` cannot be changed
you can’t call getpid when initializing a constexpr variable, since it doesn’t yield a compile-time constant. | |
cpp_utility/constexprarraysize_100_0.txt | And none of the hypothetical language changes I’ve described in this post are
exactly trivial either, so I expect we’ll have to live this problem for a
while… | |
cpp_utility/0eQsx6ip1DwJpli1_122_0.txt | Forward | |
cpp_utility/0eQsx6ip1DwJpli1_294_0.txt | 0 new messages | |
cpp_utility/76362_125_0.txt | ### Footer navigation | |
cpp_utility/0eQsx6ip1DwJpli1_3_0.txt | Send feedback to Google | |
cpp_utility/cpp_tag_0_4.txt | http://es.cppreference.com/w/cpp/utility/piecewise_construct "cpp/utility/piecewise construct")
* [ Français ](http://fr.cppreference.com/w/cpp/utility/piecewise_construct "cpp/utility/piecewise construct")
* [ Italiano ](http://it.cppreference.com/w/cpp/utility/piecewise_construct "cpp/utility/piecewise construct"... | |
cpp_utility/0eQsx6ip1DwJpli1_228_0.txt | unread, | |
cpp_utility/76362_43_0.txt | * [ Code ](/llvm/llvm-project)
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cpp_utility/0eQsx6ip1DwJpli1_73_0.txt | unread, | |
cpp_utility/76362_101_0.txt | [
](/dyumin) | |
cpp_utility/constexprarraysize_75_0.txt | void f(span<int, 5>); | |
cpp_utility/76362_59_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/0eQsx6ip1DwJpli1_288_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_16_0.txt | * Open Source | |
cpp_utility/0eQsx6ip1DwJpli1_258_0.txt | You do not have permission to delete messages in this group | |
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cpp_utility/76362_44_0.txt | Additional navigation options | |
cpp_utility/76362_25_0.txt | Clear | |
cpp_utility/0eQsx6ip1DwJpli1_234_0.txt | Delete | |
cpp_utility/0eQsx6ip1DwJpli1_32_0.txt | to std-dis...@isocpp.org | |
cpp_utility/constexprarraysize_24_0.txt | This would be more obvious if our situation used pointers instead of
references: | |
cpp_utility/0eQsx6ip1DwJpli1_119_0.txt | Oct 13, 2013, 5:18:00 PM 10/13/13 | |
cpp_utility/76362_49_0.txt | By clicking “Sign up for GitHub”, you agree to our [ terms of service
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cpp_utility/0eQsx6ip1DwJpli1_110_0.txt | [...] | |
cpp_utility/76362_70_0.txt |
successfully compiles with ` --std=c++20 -O3 -Wall -Werror -Wpedantic
-Winvalid-constexpr ` on clang 17.0.1. | |
cpp_utility/0eQsx6ip1DwJpli1_224_0.txt | >
>
> | |
cpp_utility/constexprarraysize_46_0.txt |
But even with fixed-extent, there are some conversions that would be perfectly
safe to be implicit: arrays! Arrays have the size encoded in the type, we
surely know at compile time if an array has 5 elements or not, so this _could_
be perfectly fine: | |
cpp_utility/0eQsx6ip1DwJpli1_291_0.txt | Reply all | |
cpp_utility/0eQsx6ip1DwJpli1_252_0.txt | Oct 14, 2013, 5:46:37 PM 10/14/13 | |
cpp_utility/0eQsx6ip1DwJpli1_149_0.txt | Report message | |
cpp_utility/76362_124_0.txt | [ ](https://github.com "GitHub") © 2024 GitHub, Inc. | |
cpp_utility/cpp_classes_3_4.txt | c_tuple_size&action=edit)
[ std::tuple_element <std::pair> ](/w/cpp/utility/pair/tuple_element "cpp/utility/pair/tuple element") (C++11) | obtains the type of the elements of ` pair `
(class template specialization) [ [edit]
](https://en.cppreference.com/mwiki/index.php?title=Template:cpp/utility/pair/dsc_tupl... | |
cpp_utility/76362_52_0.txt | # constexpr std::array out-of-bounds array index access compiles without
warnings or errors #76362 | |
cpp_utility/CanIconstexpranstdar_4_0.txt | Which is exactly what happened when Queen Elizabeth passed away in 2022. So overall, Willian inherited quite a bit more than Harry. | |
cpp_utility/76362_24_0.txt | Search | |
cpp_utility/0eQsx6ip1DwJpli1_21_0.txt | Reply to author | |
cpp_utility/76362_47_0.txt | **Have a question about this project?** Sign up for a free GitHub account to
open an issue and contact its maintainers and the community. | |
cpp_utility/0eQsx6ip1DwJpli1_142_0.txt | Reply to author | |
cpp_utility/cpp_tag_0_2.txt | ity/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)
[ any ](/w/cpp/utility/any "cpp/utility/any") (... | |
cpp_utility/cpp_classes_3_3.txt | Member types
* 1.4 Example
* 1.5 Defect reports
* 1.6 See also
---
## Inherited from [ std:: integral_constant ](/w/cpp/types/integral_constant
"cpp/types/integral constant")
### Member constants
value [static] | the constant value 2
(public static member constant)
---|---
... | |
cpp_utility/0eQsx6ip1DwJpli1_140_0.txt | unread, | |
cpp_utility/0eQsx6ip1DwJpli1_39_0.txt | By the way my original attempt was to try to write a constexpr function that
would sort a list of integers at compile time without any template
metaprogramming, just classic imperative style. The plan was to take advantage
of the fact that std::array<T, N> is a literal type when T is a literal type
(3.9.10) so it shoul... | |
cpp_utility/0eQsx6ip1DwJpli1_152_0.txt | Either email addresses are anonymous for this group or you need the view
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cpp_utility/0eQsx6ip1DwJpli1_64_0.txt | 2013/10/12 < [ thomas....@gmail.com ]() >: | |
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cpp_utility/76362_10_0.txt | For | |
cpp_utility/CanIconstexpranstdar_29_0.txt | Short version: constexpr tells the compiler that the item it qualifies should be evaluated at compile time and the result treated as a compile-time constant. | |
cpp_utility/0eQsx6ip1DwJpli1_101_0.txt | Delete | |
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cpp_utility/0eQsx6ip1DwJpli1_44_0.txt | }
return std::array<int, N>{a[idx]...}; // and copy the result in a std::array
} | |
cpp_utility/constexprarraysize_22_0.txt | ### Wait, why? __ | |
cpp_utility/0eQsx6ip1DwJpli1_264_0.txt | to std-dis...@isocpp.org | |
cpp_utility/constexprarraysize_10_0.txt | By _[ Barry Revzin ](https://twitter.com/BarryRevzin) _ | |
cpp_utility/0eQsx6ip1DwJpli1_167_0.txt | You do not have permission to delete messages in this group | |
cpp_utility/CanIconstexpranstdar_41_0.txt | constexpr int pid = getpid(); // error
In turn, the compiler will allow you to use that variable in contexts where a compile-time constant is required, such as a template argument. | |
cpp_utility/76362_39_0.txt | You signed in with another tab or window. [ Reload ]() to refresh your
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cpp_utility/cpp_tag_2_5.txt | t ` can be used in the constructor's
parameter list to match the intended tag.
2) The corresponding ` std::nontype ` instance of (1) is a disambiguation
argument tag that can be passed to the constructors of std::function_ref to
indicate that the contained object should be constructed with the value of the
non-ty... | |
cpp_utility/0eQsx6ip1DwJpli1_251_0.txt | unread, | |
cpp_utility/0eQsx6ip1DwJpli1_38_0.txt |
I don't understand why reference std::array::operator[] is not constepxr. At
first I thought it was to avoid some unsafe usage or constness issue but I
can't think of any.
In fact now that we have.relaxed constexpr and that constepxr member function
are no longer implicitly const it looks to me that the keyword "const... | |
cpp_utility/0eQsx6ip1DwJpli1_279_0.txt | Delete | |
cpp_utility/0eQsx6ip1DwJpli1_166_0.txt | Delete | |
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cpp_utility/cpp_classes_0_5.txt | 中文 ](http://zh.cppreference.com/w/cpp/utility/pair "cpp/utility/pair")
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cpp_utility/constexprarraysize_13_0.txt | This issue was first pointed out to me by Michael Park, and mostly explained
to me by T.C. | |
cpp_utility/76362_86_0.txt | --- | |
cpp_utility/0eQsx6ip1DwJpli1_177_0.txt | The constexpr keyword does have utility. | |
cpp_utility/76362_90_0.txt | [ 
](/shafik) | |
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cpp_utility/0eQsx6ip1DwJpli1_20_0.txt | Oct 12, 2013, 10:43:09 PM 10/12/13 | |
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cpp_utility/0eQsx6ip1DwJpli1_161_0.txt | Oct 14, 2013, 3:31:14 AM 10/14/13 | |
cpp_utility/76362_46_0.txt | New issue | |
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cpp_utility/76362_78_0.txt | [
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cpp_utility/0eQsx6ip1DwJpli1_94_0.txt | ### Gabriel Dos Reis |
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