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I understand recursive mutex allows mutex to be locked more than once without getting to a deadlock and should ... design/code-level situations. See Question&Answers more detail:os...

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

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haskell - What does "pure" mean in "pure functional language"?

Haskell has been called a "pure functional language." What does "pure" mean in this context? What consequences does this have for a programmer? See Question&Answers more detail:os...

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

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Tracking *maximum* memory usage by a Python function

I want to find out what the maximum amount of RAM allocated during the call to a function is (in Python). ... used during the function call was? 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's the difference between the printf and vprintf function families, and when should I use one over the other?

I understand that the difference between the printf, fprintf, sprintf etc functions and the vprintf, vfprintf, ... to pick vprintf instead? See Question&Answers more detail:os...

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

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When is a Test not a Unit-test?

I am looking for rules like: A test is not a unit-test if: it communicates with a database it cannot run in ... file system What else is there? 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 zoom effect for image view in android?

I have to implement image zooming, I have tried with so many codes.But i didnt get full idea of gesture events. I ... me some idea of that.... See Question&Answers more detail:os...

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

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html5 video - Disable download button for Google Chrome?

Google Chrome is now shipping with a download button for videos that are just embedded videos (i.e. not MSE): I ... of the controls. Thank you! See Question&Answers more detail:os...

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

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algorithm - How to check if an integer is a power of 3?

I saw this question, and pop up this idea. See Question&Answers more detail:os...

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

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primary key - make an ID in a mysql table auto_increment (after the fact)

I acquired a database from another developer. He didn't use auto_incrementers on any tables. They all ... ' to '.DBNAMEdealer_master_events' 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 - Oracle 'Partition By' and 'Row_Number' keyword

I have a SQL query written by someone else and I'm trying to figure out what it does. Can someone please ... bit too depth. Thanks in advance! See Question&Answers more detail:os...

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

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544 views

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algorithm - How to find max. and min. in array using minimum comparisons?

This is a interview question: given an array of integers find the max. and min. using minimum comparisons. ... would like to do better. See Question&Answers more detail:os...

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

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ios - Formatting Phone number in Swift

I'm formatting my textfiled text once the user start typing the phone number into this format type 0 (555) 444 66 ... }else{ return true } } See Question&Answers more detail:os...

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

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Why do we use "companion object" as a kind of replacement for Java static fields in Kotlin?

What is the intended meaning of "companion object"? So far I have been using it just to replace Java's static ... it. What's the better way? See Question&Answers more detail:os...

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

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android - How can I handle empty response body with Retrofit 2?

Recently I started using Retrofit 2 and I faced an issue with parsing empty response body. I have a server which ... (headers, status code etc)? 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 force remounting on React components?

Lets say I have a view component that has a conditional render: render(){ if (this.state.employed) { return ( < ... me what I'm doing wrong... See Question&Answers more detail:os...

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

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721 views

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swift - Include SwiftUI views in existing UIKit application

Is is possible to build views with SwiftUI side by side with an existing UIKit application? I have an ... .xib Working alongside each other See Question&Answers more detail:os...

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

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432 views

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How to grant remote access to MySQL for a whole subnet?

I can easily grant access to one IP using this code: $ mysql -u root -p Enter password: mysql> use mysql mysql ... remotely. How can i do that? See Question&Answers more detail:os...

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

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android - java.lang.IllegalStateException: The specified child already has a parent

I am using fragments, when I instantiate a fragment the first time it it. but the second time I got this ... this bug. Thanks every one! See Question&Answers more detail:os...

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

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Can parameterized statement stop all SQL injection?

If yes, why are there still so many successful SQL injections? Just because some developers are too dumb to use parameterized statements? 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 - Simple Socket Server in Bash?

Is there a way to quickly bind to a TCP port/ip address and simply print out all information to STDOUT? I have ... an easy way to do this? See Question&Answers more detail:os...

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

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android - FragmentTransaction animation to slide in over top

I am trying to achieve the following effect using FragmentTransaction.setCustomAnimations. Fragment A is showing Replace ... ="bottom" /> See Question&Answers more detail:os...

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

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ios - How to Dismiss a Storyboard Popover

I've created a popover from a UIBarButtonItem using Xcode Storyboards (so there's no code) like this: ... UIBarButtonItem for a second time? See Question&Answers more detail:os...

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

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833 views

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the MySQL service on local computer started and then stopped

the MySQL service on local computer started and then stopped. Some services stop automatically if they are not ... resolve this issue? 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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289 views

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php - Get Image Height and Width as integer values?

I've tried to use the PHP function getimagesize, but I was unable to extract the image width and height as an ... . How can I achieve this? See Question&Answers more detail:os...

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

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635 views

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android - How do I read properties defined in local.properties in build.gradle

I have set sdk.dir and ndk.dir in local.properties. How do I read the values defined in sdk.dir and ndk.dir in the build.gradle file? 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 do I display the value of a Django form field in a template?

I have a form with an email property. When using {{ form.email }} in case of some validation error, Django ... field's value in the template? See Question&Answers more detail:os...

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

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362 views

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javascript - Super in Backbone

When I override the clone() method of a Backbone.Model, is there a way to call this overriden method from my ... the original clone method } }) See Question&Answers more detail:os...

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

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451 views

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ios - Switching between Text fields on pressing return key in Swift

I'm designing an iOS app and I want that when the return key is pressed in my iPhone it directs me to ... UITextField to insert line-breaks. } See Question&Answers more detail:os...

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

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