id stringlengths 16 145 | text stringlengths 1 179k | title stringclasses 1
value |
|---|---|---|
cpp_utility/76362_31_0.txt | # Saved searches | |
cpp_utility/76362_92_0.txt | Collaborator | |
cpp_utility/constexprarraysize_68_0.txt | ### Is there a language solution for this? __ | |
cpp_utility/constexprarraysize_57_0.txt | template <typename T>
constexpr auto type_size(type_t<T>) -> decltype(T::size()) {
return T::size();
} | |
cpp_utility/cpp_classes_5_5.txt | plate:cpp/container/array/dsc_to_array&action=edit)
---|---
[ integral_constant bool_constant ](/w/cpp/types/integral_constant "cpp/types/integral constant") (C++11) (C++17) | compile-time constant of specified type with specified value
(class template) [ [edit]
](https://en.cppreference.com/mwiki/index.ph... | |
cpp_utility/76362_89_0.txt | [ 
](/EugeneZelenko) [ EugeneZelenko ](/EugeneZelenko) added [ 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/... | |
cpp_utility/0eQsx6ip1DwJpli1_92_0.txt | Once you've specified in interface documentation that a function can
appear in a constant expression, what does anyone gain from having a
"sometimes this forms a constant expression" annotation in the code? | |
cpp_utility/constexprarraysize_77_0.txt | f(c_array); // now ok
f(cpp_array); // now ok | |
cpp_utility/76362_110_0.txt | [ Sign up for free ](/join?source=comment-repo) **to join this conversation on
GitHub** . Already have an account? [ Sign in to comment
](/login?return_to=https%3A%2F%2Fgithub.com%2Fllvm%2Fllvm-
project%2Fissues%2F76362) | |
cpp_utility/0eQsx6ip1DwJpli1_133_0.txt |
I wasn't aware of the history, so thanks! | |
cpp_utility/0eQsx6ip1DwJpli1_5_0.txt | Training | |
cpp_utility/76362_68_0.txt | constexpr std::array Array = {1, 2}; | |
cpp_utility/76362_113_0.txt | Labels | |
cpp_utility/76362_67_0.txt | #include <array> | |
cpp_utility/constexprarraysize_7_0.txt | __ __ Cancel | |
cpp_utility/76362_117_0.txt | Milestone | |
cpp_utility/CanIconstexpranstdar_43_0.txt | No. | |
cpp_utility/0eQsx6ip1DwJpli1_89_0.txt | The user can't detect whether a function is declared constexpr, only
whether a given function call may appear in a constant expression. Aside
from constexpr functions whose entire definitions are provided, such as
numeric_limits members, there's no guarantee about how any standard
constexpr function must be used to for... | |
cpp_utility/76362_108_0.txt | All reactions | |
cpp_utility/0eQsx6ip1DwJpli1_97_0.txt | Reply to author | |
cpp_utility/constexprarraysize_61_0.txt | constexpr int arr[] = {1, 2, 3, 4, 5};
constexpr std::span<int> s = arr; | |
cpp_utility/0eQsx6ip1DwJpli1_244_0.txt | >> Actually, it's worse than you think. I originally used N3690 as a C++14
reference for my proposal (a future N3794), then I discovered there's a later
draft: N3691. That draft stripped "constexpr" off of all of array 's
methods, except for size , empty , and max_size . So my proposal
followed the later draft. | |
cpp_utility/constexprarraysize_102_0.txt | This post is licensed under [ CC BY 4.0
](https://creativecommons.org/licenses/by/4.0/) by the author. | |
cpp_utility/0eQsx6ip1DwJpli1_176_0.txt | >> David Krauss < [ pot...@gmail.com ]() > writes:
>
> [...]
>
> | TBH I don't really understand why we need the constexpr qualifier for
> | functions in the first place.
>
> I am not sure what you mean by this: (1) that you are unaware of how the
> constexpr keyword came to be? or (2) that you know the history bu... | |
cpp_utility/0eQsx6ip1DwJpli1_198_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 constexpr
, that all... | |
cpp_utility/constexprarraysize_20_0.txt | void check(int const (¶m)[3]) {
int local[] = {1, 2, 3};
constexpr auto s0 = array_size(local); // ok
constexpr auto s1 = array_size(param); // error
} | |
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cpp_utility/0eQsx6ip1DwJpli1_11_0.txt | Labels | |
cpp_utility/constexprarraysize_43_0.txt | void f(std::span<int, 5>); | |
cpp_utility/76362_87_0.txt | All reactions | |
cpp_utility/0eQsx6ip1DwJpli1_297_0.txt | Close search | |
cpp_utility/76362_7_0.txt | Explore | |
cpp_utility/76362_83_0.txt | edited | |
cpp_utility/CanIconstexpranstdar_0_0.txt |
Can I constexpr an std::array?
Sort
Profile photo for John R. Grout
John R. Grout
Programmed in C++ since cfront daysAuthor has 2.5K answers and 1.7M answer views
·
4y
Originally Answered: Can I constexpr an std: :array?
Not only can you do that… you can compute all of its values at compile time! | |
cpp_utility/0eQsx6ip1DwJpli1_221_0.txt | >> ` | |
cpp_utility/cpp_classes_1_2.txt | mmon 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") (C++17)
[ variant ](/w/cpp/utility/variant "cpp/ut... | |
cpp_utility/0eQsx6ip1DwJpli1_293_0.txt | Forward | |
cpp_utility/0eQsx6ip1DwJpli1_144_0.txt | Forward | |
cpp_utility/0eQsx6ip1DwJpli1_66_0.txt |
The fact that std::array is applying constexpr to the const overloads
alone is simply a consequence of the fact that the proposing paper was
written at a time, where the rules were different and would not have
allowed that. Fixing the inconsistent difference of constexpr
non-static member functions versus free or stat... | |
cpp_utility/0eQsx6ip1DwJpli1_93_0.txt |
 | |
cpp_utility/constexprarraysize_42_0.txt | But that isn’t necessarily the case for ` span<T, 5> ` \- we certainly don’t
want that to be implicitly constructible from ` vector<T> ` , since how do we
know if the incoming vector has enough elements in it? The direction we’re
going (see [ P1976 ](https://wg21.link/p1976) ) is that this constructor will
instead be `... | |
cpp_utility/0eQsx6ip1DwJpli1_59_0.txt | Report message | |
cpp_utility/0eQsx6ip1DwJpli1_42_0.txt |
Which doesn't compile because of the lack of constexpr reference operator[].
So instead I ended up doing the sort inside a plain C-array and then copy it
into a std::array. It works, but the code is weirder and harder to read : | |
cpp_utility/cpp_classes_5_2.txt | destructible") (C++11) (C++11)
(C++11)
[ has_virtual_destructor ](/w/cpp/types/has_virtual_destructor "cpp/types/has
virtual destructor") (C++11)
[ is_swappable_with is_swappable is_nothrow_swappable_with
is_nothrow_swappable ](/w/cpp/types/is_swappable "cpp/types/is swappable")
(C++17) (C++17) (C++17) (C++... | |
cpp_utility/76362_76_0.txt | [ 
](/apps/github-actions) [ github-actions ](/apps/github-actions) bot added
the [ new issue ](/llvm/llvm-project/labels/new%20issue) label Dec 25, 2023 | |
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cpp_utility/0eQsx6ip1DwJpli1_255_0.txt | Forward | |
django_CharField/workingwithjson_125_0.txt | This page describes how to work with JSON using Spanner. | |
django_CharField/workingwithjson_81_0.txt | * [ Modify data using the Google Cloud console ](/spanner/docs/modify-data)
* [ Modify data using the gcloud CLI ](/spanner/docs/modify-gcloud)
* Modify data using DML | |
django_CharField/jsondata_175_0.txt | * [ Get started with BigQuery ML ](/bigquery/docs/create-machine-learning-model)
* Generative AI | |
django_CharField/jsondatahtml_3_0.txt | * [ Getting Help and Reporting Issues ](../support.html)
* [ Making Contributions ](../contribute.html)
* * * * | |
django_CharField/workingwithjson_150_0.txt | public class AddJsonColumnAsyncSample
{
public async Task AddJsonColumnAsync(string projectId, string instanceId, string databaseId)
{
string connectionString = $"Data Source=projects/{projectId}/instances/{instanceId}/databases/{databaseId}";
string alterStatement = "ALTER TABLE Venues ADD COLUMN VenueDetails JSON"; | |
django_CharField/607740_101_0.txt | ](http://twitter.com/share?text=Application Integration - json scheme 'number'
parameter issue&url=https://www.googlecloudcommunity.com/gc/Integration-
Services/Application-Integration-json-scheme-number-parameter-
issue/m-p/607740) | |
django_CharField/workingwithjson_286_0.txt | var venues = new List<Venue>();
using var reader = await cmd.ExecuteReaderAsync();
while (await reader.ReadAsync())
{
venues.Add(new Venue
{
VenueId = reader.GetFieldValue<int>("VenueId"),
VenueDetails = reader.GetFieldValue<string>("VenueDetails")
});
}
return venues;
}
} | |
django_CharField/jsondata_208_0.txt | * [ Manage tables ](/bigquery/docs/managing-tables)
* [ Manage table data ](/bigquery/docs/managing-table-data) | |
django_CharField/jsondata_97_0.txt | * [ Schedule transfers ](/bigquery/docs/play-transfer)
* [ Transfer report transformation ](/bigquery/docs/play-transformation) | |
django_CharField/607740_192_0.txt | Associated Products | |
django_CharField/jsondata_68_0.txt | * [ Introduction ](/bigquery/docs/connections-api-intro)
* [ Amazon S3 connection ](/bigquery/docs/omni-aws-create-connection)
* [ Apache Spark connection ](/bigquery/docs/connect-to-spark)
* [ Azure Blob Storage connection ](/bigquery/docs/omni-azure-create-connection)
* [ Cloud resource connection ](/bigquery/do... | |
django_CharField/workingwithjson_184_0.txt | ### Python | |
django_CharField/jsondata_381_0.txt |
Alternatively, you can use the [ ` STRING `
](/bigquery/docs/reference/standard-sql/json_functions#string_for_json)
function which extracts a JSON string and returns that value as a SQL ` STRING
` . For example: | |
django_CharField/jsondata_235_0.txt | * [ Introduction ](/bigquery/docs/labels-intro)
* [ Add labels ](/bigquery/docs/adding-labels)
* [ View labels ](/bigquery/docs/viewing-labels)
* [ Update labels ](/bigquery/docs/updating-labels)
* [ Filter using labels ](/bigquery/docs/filtering-labels)
* [ Delete labels ](/bigquery/docs/deleting-labels) | |
django_CharField/607740_59_0.txt | 
* [ Query optimizer versions ](/spanner/docs/query-optimizer/versions)
* [ List query optimizer versions ](/spanner/docs/query-optimizer/version-statistics)
* [ Manage the query optimizer ](/spanner/docs/query-optimizer/manage-query-optimizer) | |
django_CharField/607740_118_0.txt | If you are still not able to get JSON.SetProperty work, can you ping me your
data mapping and JSON variable schema ? | |
django_CharField/workingwithjson_187_0.txt | spanner_client = spanner.Client()
database_admin_api = spanner_client.database_admin_api | |
django_CharField/jsondata_215_0.txt | * [ Introduction ](/bigquery/docs/reservations-intro)
* [ Slots ](/bigquery/docs/slots)
* [ Slot reservations ](/bigquery/docs/reservations-workload-management)
* [ Slots autoscaling ](/bigquery/docs/slots-autoscaling-intro)
* Use reservations | |
django_CharField/workingwithjson_353_0.txt | * [ Google Cloud documentation ](/docs/)
* [ Google Cloud quickstarts ](/docs/get-started/)
* [ Google Cloud Marketplace ](/marketplace/)
* [ Learn about cloud computing ](/discover/)
* [ Support ](/support-hub/)
* [ Code samples ](/docs/samples)
* [ Cloud Architecture Center ](/architecture/)
* [ Training ](/learn/tra... | |
django_CharField/jsondata_209_0.txt | * Table clones | |
django_CharField/jsondata_24_0.txt | * Try the command-line tool | |
django_CharField/607740_128_0.txt | ; | |
django_CharField/607740_206_0.txt | [ View all ](/gc/solutions/acceptedsolutionsleaderboardpage/node-display-
id/board%3Acloud-integration-services/timerange/one_month) | |
django_CharField/workingwithjson_217_0.txt | To authenticate to Spanner, set up Application Default Credentials. For more
information, see [ Set up authentication for a local development environment
](/docs/authentication/provide-credentials-adc#local-dev) . | |
django_CharField/workingwithjson_140_0.txt | A JSON column can be added to a table when the table is created. JSON type
values can be nullable. | |
django_CharField/jsondata_227_0.txt | * Audit workloads | |
django_CharField/workingwithjson_71_0.txt | * [ Integrate with SQLAlchemy (GoogleSQL) ](/spanner/docs/use-sqlalchemy)
* [ Integrate with SQLAlchemy (PostgreSQL) ](/spanner/docs/use-sqlalchemy-pg) | |
django_CharField/607740_34_0.txt | * [ Community Feedback ](/gc/Community-Feedback/bd-p/cloud-community-feedback) | |
django_CharField/607740_89_0.txt | [
](https://www.googlecloudcommunity.com/gc/forums/v5/forumtopicpage.kudosbuttonv2.kudoentity:kudoentity/kudosable-
gid/605739?t:ac=board-id/cloud-integration-services/message-
id/353&t:cp=kudos/contributions/tapletcontributionspage "Click here to give
likes to this post.") | |
django_CharField/jsondata_421_0.txt | * ### Why Google | |
django_CharField/workingwithjson_57_0.txt | * [ Import and export data in CSV format ](/spanner/docs/import-export-csv)
* [ Import data from PostgreSQL using COPY ](/spanner/docs/import-copy)
* [ Bulk loading best practices ](/spanner/docs/bulk-loading)
* Disaster recovery | |
django_CharField/jsondata_406_0.txt |
For more information about arrays, see [ Working with arrays in GoogleSQL
](/bigquery/docs/arrays) . | |
django_CharField/django_CharField_15_0.txt | ### ` unique ` ¶
` Field. ` ` unique ` ¶
If ` True ` , this field must be unique throughout the table.
This is enforced at the database level and by model validation. If you try to
save a model with a duplicate value in a ` unique ` field, a [ `
django.db.IntegrityError ` ](../../exceptions/#django.db.... | |
django_CharField/jsondatahtml_6_0.txt | Using the JSON Data Model | |
django_CharField/workingwithjson_227_0.txt | return nil
} | |
django_CharField/jsondata_48_0.txt | * Tables | |
django_CharField/jsondatahtml_33_0.txt | // The following are all equivalent
time_t epoch = now.ToEpochTime();
DateTime from_epoch(epoch); | |
django_CharField/jsondata_278_0.txt | * If you use a [ batch load job ](/bigquery/docs/batch-loading-data) to ingest JSON data into a table, the source data must be in CSV, Avro, or JSON format. Other batch load formats are not supported.
* The ` JSON ` data type has a nesting limit of 500.
* You can't use [ legacy SQL ](/bigquery/docs/reference/standard-s... | |
django_CharField/jsondata_220_0.txt | * [ Introduction ](/bigquery/docs/bi-engine-intro)
* [ Reserve BI Engine capacity ](/bigquery/docs/bi-engine-reserve-capacity)
* [ Use preferred tables ](/bigquery/docs/bi-engine-preferred-tables) | |
django_CharField/workingwithjson_6_0.txt | * [ Access and resources management ](https://cloud.google.com/docs/access-resources)
* [ Cloud SDK, languages, frameworks, and tools ](https://cloud.google.com/docs/devtools)
* [ Costs and usage management ](https://cloud.google.com/docs/costs-usage)
* [ Infrastructure as code ](https://cloud.google.com/docs/iac)
... | |
django_CharField/jsondatahtml_23_0.txt | void ProcessData(const JsonCppData& data); | |
django_CharField/workingwithjson_38_0.txt | * [ TTL overview ](/spanner/docs/ttl)
* [ Manage data retention with TTL ](/spanner/docs/ttl/working-with-ttl)
* [ TTL metrics and monitoring ](/spanner/docs/ttl/monitoring-and-metrics) | |
django_CharField/workingwithjson_323_0.txt | ### Python | |
django_CharField/jsondata_3_0.txt | * [ AI solutions, generative AI, and ML ](https://cloud.google.com/docs/ai-ml)
* [ Application development ](https://cloud.google.com/docs/application-development)
* [ Application hosting ](https://cloud.google.com/docs/application-hosting)
* [ Compute ](https://cloud.google.com/docs/compute-area)
* [ Data analytic... | |
django_CharField/607740_149_0.txt | Q. Using JSON.SetProperty without default value | |
django_CharField/607740_136_0.txt | 
* [ Jumping In ](../start/get_started.html)
* [ Understanding the Scope ](../activity_model.html)
* [ Understanding the Code Base ](../object_model.html)
* [ Available Specialized Service APIs ](../available_service_apis.html)
* * * ... |
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