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ios - What does the text inside parentheses in @interface and @implementation directives mean?

I've got a very basic question about some sample code from Apple. In the .m file, the class declarations ... Is my understanding right? Thanks! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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polymorphism - C++ abstract class without pure virtual functions?

I have a base class class ShapeF { public: ShapeF(); virtual ~ShapeF(); inline void SetPosition(const ... without the pure virtual functions. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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php - HEREDOC interfering with code indentation

I like the HEREDOC syntax, e.g. for edge cases of generated HTML that are not worth putting into a template. ... source files. Am I correct? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - Pygame on Android

I was wondering if someone could give me a detailed explanation on how to run a game/app developed using Pygame on ... would be great. Thanks <3 See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How does Excel successfully round floating point numbers even though they are imprecise?

For example, this blog says 0.005 is not exactly 0.005, but rounding that number yields the right result. ... incorrect for the above problem. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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event handling - jquery mousewheel: detecting when the wheel stops?

I'm using Jquery mousewheel plugin and I would like like to be able to detect when the user has finished using ... me to the right direction? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql - Why are logical reads for windowed aggregate functions so high?

I've found that in execution plans using common subexpression spools that the reported logical reads get quite ... NULL DROP TABLE #WorkTable See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Is there a built-in way to swap two variables in C

I know how to swap 2 variables in c++ , ie you use std::swap(a,b). question: Does the C standard library ... or do I have to define it myself. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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.htaccess - redirect all .html extensions to .php

I want to update all the pages on a website to use include for the footer and header. So I have to change a ... same url but ending in .php. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript - how to fix 'Access to XMLHttpRequest has been blocked by CORS policy' Redirect is not allowed for a preflight request only one route

i'm setting a laravel and vuejs. CORS plugin for laravel and frontend side i use Axios to call REST api ... working. also working on Postman See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - What is the reason for not being able to deduce array size from initializer-string in member variable?

Consider the code: struct Foo { const char str[] = "test"; }; int main() { Foo foo; } It fails ... -class const C-like null terminated string. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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How to implement a cleanup routine in R Shiny?

For instance, my shiny app might open a DB connection # server.R db <- dbConnect("SQLite", DB_PATH) ... simply by closing their browsers. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c# - Convert DateTime to a specified Format

I have this date format yy/MM/dd HH:mm:ss ex: 12/02/21 10:56:09. The problem is, when i try ... balance inquiry fro my SMS based application. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Is there any use for local function declarations?

Most C++ programmers like me have made the following mistake at some point: class C { /*...*/ }; ... : expression must be a modifiable lvalue See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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internet explorer 11 - IE11 prevents ActiveX from running

Our web browser plugin works fine in IE9 and IE10 but in IE11 the plugin is neither recognized as an add-on ... need to correct IE settings! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - JTextPane highlight text

Can I highlight some text into a JTextPane starting from a value and ending from another value like the following ... highlight text "" Thanks. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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linux - Relinking an anonymous (unlinked but open) file

In Unix, it's possible to create a handle to an anonymous file by, e.g., creating and opening it with ... in the disk's directory structure. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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php - getting output and exit status from shell_exec()

When doing something like $output = shell_exec("command 2>&1"); collecting the command's stdout & stderr in ... clunky. Any better suggestions? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c# - Set array key as string not int?

I am trying to set the array keys as a strings like in the example below, but inC#. <?php $array = array(); $array['key_name'] = "value1"; ?> See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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URL encoding using the new Spring UriComponentsBuilder

I'm attempting to use spring's UriComponentsBuilder to generate some urls for oauth interaction. The query parameters ... tree(s) here? Thanks See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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infinite loop - Is while(1); undefined behavior in C?

In C++11 is it Undefined Behavior, but is it the case in C that while(1); is Undefined Behavior? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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ruby on rails - How can I remove a default gem? ! want to uninstall a gem 1.7.7 version of json

I have the same rails app in OSX and Ubuntu, I want to use Zeus to speed up my rspec. In Ubuntu, Zeus ... a default gem What should I do? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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node.js - How to build a production version of React without minification?

Background I've been following more or less the official guide to setup a local dev environment with react and it ... or this specific use case. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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363 views

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php - laravel model callbacks after save, before save, etc

Are there callbacks in Laravel like: afterSave() beforeSave() etc I searched but found nothing. If there are no ... way to implement it? Thanks! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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PHP include causes white space at the top of the page

I have a problem on a site that I am making. There is this line of white space at the top of my page. I ... or maybe it is just some faulty css. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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319 views

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Short circuit on |= and &= assignment operators in C#

I know that || and && are defined as short-circuit operators in C#, and such behaviour is guaranteed ... short circuiting would be problematic? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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328 views

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javascript - SequelizeConnectionError: self signed certificate

I am trying to connect to a PostgreSQL Database that I've set up in Heroku. const { ... SequelizeConnectionError: self signed certificate See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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716 views

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c# - Disallow/Block selection of disabled combobox item in wpf

I'm writing an application wherein I would like to disable few items in the ComboBox and also want to disallow/ ... > </Border> </DataTemplate> See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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