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c++ - Why is an assignment to a base class valid, but an assignment to a derived class a compilation error?

This was an interview question. Consider the following: struct A {}; struct B : A {}; A a; B b; a = b; ... an-assignment-to-a-base-class-valid-but-an-assignment-to-a-derived-class...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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110 views

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php - Can I use an instantiated Object as an Array Key?

For example: $product = new Product("cat"); if(isset($sales[$product])){ $sales[$product]++; } else{ $sales[ ... questions/4642980/can-i-use-an-instantiated-object-as-an-array-key...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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356 views

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php - How to assign an array within a smarty template file?

I was wondering if it was possible to assign an array to a variable within a Smarty template file? I have tried ... /2244319/how-to-assign-an-array-within-a-smarty-template-file...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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607 views

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Can I map a result to Tuple in Dapper?

I am trying to select a list of 2 integer columns map the results to a Tuple. Just as an example: return connection ... com/questions/34867432/can-i-map-a-result-to-tuple-in-dapper...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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217 views

1 answer

c# - string.split returns a string[] I want a List<string> is there a one liner to convert an array to a list?

Lists in C# have the .ToArray() method. I want the inverse, where an array is transformed into a list. I know how to ... -a-string-i-want-a-liststring-is-there-a-one-liner-to-co...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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249 views

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php - How to detect the current language of a Joomla! website?

I just want to generate a code that will detect the current language of my websit in joomla + php question from: ... /3352241/how-to-detect-the-current-language-of-a-joomla-website...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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199 views

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visual c++ - VC++ resources in a static library

Is it possible to build resources into a static library and reuse them by simply linking with the library? ... /stackoverflow.com/questions/531502/vc-resources-in-a-static-library...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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177 views

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sql - Why OBJECT_ID used while checking if a table exists or not

I need to check if a table in SQL exist or not. If not it must create one automatically. Now I researched and found ... /why-object-id-used-while-checking-if-a-table-exists-or-not...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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211 views

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"for" loop in velocity template

I already posted a similar question a week ago on How to use 'for' loop in velocity template?. So... ... :https://stackoverflow.com/questions/5735097/for-loop-in-velocity-template...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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464 views

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stack - Escape analysis in Java

As far as I know the JVM uses escape analysis for some performance optimisations like lock coarsening and lock ... ://stackoverflow.com/questions/771430/escape-analysis-in-java...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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275 views

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javascript - How to go back 1 folder level with __dirname?

I am using gulp-karma and facing a simple problem but cannot seems to find what i am doing wrong . gulp.task(' ... com/questions/30845416/how-to-go-back-1-folder-level-with-dirname...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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213 views

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JavaScript flattening an array of arrays of objects

I have an array which contains several arrays, each containing several objects, similar to this. [[object1, ... /29158723/javascript-flattening-an-array-of-arrays-of-objects...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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263 views

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java - "An error occurred while automatically activating bundle com.android.ide.eclipse.adt"

When going here: right-click on my project > Properties > Android the below error happens. This error ... -occurred-while-automatically-activating-bundle-com-android-ide-eclipse...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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307 views

1 answer

c++ - Modifying vertex properties in a Boost::Graph

I am trying to figure out how to use boost::graph to store some information. However, there is ... /stackoverflow.com/questions/671714/modifying-vertex-properties-in-a-boostgraph...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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83 views

1 answer

How to change the link color in a specific class for a div CSS

In my Page the following CSS is set: a:link { color: #0094DE; text-decoration: none; } a:visited { text-decoration: ... to-change-the-link-color-in-a-specific-class-for-a-div-css...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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418 views

1 answer

diff - Git: Compare All Local Commits to Remote Repo Version

I'm somewhat new to Git and what I'm trying to do seems like it should be possible. Basically I've ... com/questions/5734722/git-compare-all-local-commits-to-remote-repo-version...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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178 views

1 answer

java - How to set timeout on client socket connection?

I am trying to set the timeout of a connection on the client socket in java. I have set a default connect ... .com/questions/5632279/how-to-set-timeout-on-client-socket-connection...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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376 views

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Use a variable within heredoc in PHP (SQL practice)

I'm a newbie to PHP/SQL and I am trying to use a variable within a heredoc as I need to output a lot ... .com/questions/11274354/use-a-variable-within-heredoc-in-php-sql-practice...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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189 views

1 answer

html - How to make the background DIV only transparent using CSS

I am using CSS attrubutes : filter: alpha(opacity=90); opacity: .9; to make the DIV transparent, but when ... /7565384/how-to-make-the-background-div-only-transparent-using-css...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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159 views

1 answer

html - How to display div after click the button in Javascript?

(This question already has answers here): question from:https://stackoverflow.com/questions/6957443/how-to-display-div-after-click-the-button-in-javascript...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.1k views

1 answer

multiple inheritance - C++ diamond problem - How to call base method only once

I'm using multiple inheritance in C++ and extending base methods by calling their base explicitly. Assume the following ... /c-diamond-problem-how-to-call-base-method-only-once...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.2k views

1 answer

rxjs - How to get an observable to return data immediately and every 5 seconds thereafter

I want to create an observable that returns data from a webapi. I'd like it to return the data immediately ... an-observable-to-return-data-immediately-and-every-5-seconds-thereaft...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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175 views

1 answer

algorithm - Why in a heap implemented by array the index 0 is left unused?

I'm learning data structures and every source tells me not to use index 0 of the array while implementing heap, without ... -a-heap-implemented-by-array-the-index-0-is-left-unused...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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111 views

1 answer

What is the difference between WPF and WinForms?

I am programming simple Windows apps. I don't need DB support. Why would I use WPF instead of WinForms? ... .com/questions/1337345/what-is-the-difference-between-wpf-and-winforms...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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443 views

1 answer

Xcode 8: Your account does not have sufficient permissions to modify containers

I'm getting this error with code signing with Xcode 8: Your account does not have sufficient permissions ... your-account-does-not-have-sufficient-permissions-to-modify-containers...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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169 views

1 answer

javascript - Tracking link clicks with google analytics?

I'm a complete beginner with Google Analytics, and I need to know how to set it up so that it ... //stackoverflow.com/questions/21147487/tracking-link-clicks-with-google-analytics...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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135 views

1 answer

c# - Get a list of elements by their ID in entity framework

How can I get all elements that are in another list by ID? I have List roles; I'd like to get all roles ... questions/5624614/get-a-list-of-elements-by-their-id-in-entity-framework...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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359 views

1 answer

bash - How do I echo stars (*) when reading password with `read`?

What do I need to do for code in Bash, if I want to echo *s in place of password characters (or even ... com/questions/1923435/how-do-i-echo-stars-when-reading-password-with-read...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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