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performance - x86_64: is IMUL faster than 2x SHL + 2x ADD?

When looking at the assembly produced by Visual Studio (2015U2) in /O2 (release) mode I saw that this ... with modern Intel x86_64 processors? See Question&Answers more detail:os...

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

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visual c++ - How to validate numeric input in C++

I'd like to know how to limit an input value to signed decimals using std::cin. 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 - Does the JDBC spec prevent '?' from being used as an operator (outside of quotes)?

From Sam Macbeth's question: Is there anything in the JDBC spec which allows a ? to be escaped and be ... an operator still be JDBC-compliant? 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 - Why can't I assign lambda to Object?

I was trying to assign a lambda to Object type: Object f = ()->{}; And it gives me error saying: The ... this happening, and how 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 - Caused by: java.lang.ClassNotFoundException: Didn't find class in Firebase Phone Authentication

I'm using Phone Authentication in Android Studio via Firebase, I Enabled Phone SignIn and Add SHA-1 And SHA- ... .main(ZygoteInit.java:858)? See Question&Answers more detail:os...

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

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removeObjectsAtIndexes for Swift arrays

What is a Swift array equivalent to NSMutableArray's -removeObjectsAtIndexes:? Removing each index one by one ... implement this functionality? See Question&Answers more detail:os...

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

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windows C system call with spaces in command

I cannot make system calls with spaces in the names and parameters. For example: system("c:\program files\something\ ... how to do it properly? 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 (un)escape strings in C/C++?

Given a counted string (either an array of characters, or a wrapper like std::string), is there a "proper" way to ... I have to do it by hand? 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 - SELECT COUNT() vs mysql_num_rows();

I have a large table (60+) millions of records. I'm using PHP script to navigate through this ... $result_count = mysql_num_rows($result); 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++ - Emulating shifts on 32 bytes with AVX

I am migrating vectorized code written using SSE2 intrinsics to AVX2 intrinsics. Much to my disappointment, ... remains for _mm256_srli_si256. 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 - PresentViewController from custom TableCell in xib

I've created custom tableView Controller, inside the cell i've placed a button to open the device photo library. My ... idea to fix my issue. See Question&Answers more detail:os...

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

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regex - Use gsub remove all string before first white space in R

I have a data frame like this: name weight r apple 0.5 y pear 0.4 y cherry 0.1 g watermelon 5.0 pp ... Can anybody give me a favor? 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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java - Reading file as single record in hadoop

I have huge no. of small files, i want to use CombineFileInputFormat to merge the files such that each file data comes as ... ; rr = null; } } } See Question&Answers more detail:os...

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

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html - Changing the <input> type in IE with JavaScript

This code below works in all web browsers except IE: <input type="text" name="passwordLogin" value=" ... remove: passwordElement1.focus(); See Question&Answers more detail:os...

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

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Integer List printed as String in Elixir

I was trying my hand on Enum.map. I found this weird output, when I added 100 to all the elements of ... still got unexpected results like 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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814 views

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gcc - How to add compiler flags on codeblocks

I've been trying to compile a simple multithreaded piece of code I found online in an effort to learn how to ... build log none of them appear. See Question&Answers more detail:os...

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

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biginteger - How do I do big integers in Fortran?

I need to generate some big integers. See example below. Input Result 40 165580141 80 37889062373143906 120 ... use in my code? See Question&Answers more detail:os...

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

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guid - Wix generate single component id for entire tree

I am someone with little to no experience with wix and I am trying to support Windows also for the component I ... name instead of "install". See Question&Answers more detail:os...

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

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591 views

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excel - VBA Password Input with Cancel Function

I have been using the standard password textbox written by Daniel Klann (http://www.ozgrid.com/forum ... UnhookWindowsHookEx hHook End Function See Question&Answers more detail:os...

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

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912 views

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asp.net mvc 3 - Unexpected "foreach" keyword after "@" character

I have a partial view done in razor. When I run it I get the following error - it seems like Razor gets stuck into ... <br /> } } } </div> 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# - Could not load file or assembly System.Runtime.CompilerServices.Unsafe

I created a Visual Studio (Community 2019) project with C# using ServiceStack.Redis. Since it is C#, I use ... Visual Studio did not help. See Question&Answers more detail:os...

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

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221 views

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android - Copying raw file into SDCard?

I've some audio files in my res/raw folder. For some reasons, i want to copy this files to my SDCard When, ... i done this? Anyone guide me? See Question&Answers more detail:os...

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

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261 views

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Custom choices in JavaScript confirm dialog

How to write a confirm dialog in JavaScript with custom choices? Instead of just "Ok" and "Cancel", I would like ... This" "That" and "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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202 views

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Java scanner not going through entire file

I'm writing a program in Java and one of the things that I need to do is to create a set of every ... help would be appreciated. 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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494 views

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iphone - How to use prepareForReuse method

I found this method called - (void)prepareForReuse. I read the document but I don't understand how to use ... code to demonstrate my working. See Question&Answers more detail:os...

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

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325 views

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javascript - How do I put codes from jsfiddle.net into my website?

I've been trying to create a little box at the bottom of my webpage which will expand / pop-up when scrolled ... exactly like it is on JSFiddle? See Question&Answers more detail:os...

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

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348 views

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Create Table in Hive with one file

I'm creating a new table in Hive using: CREATE TABLE new_table AS select * from old_table; My problem is that ... in the table? 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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319 views

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.net - Invoke in Windows Forms

Does anyone have a link to a learning resource for using Invoke? I'm trying to learn but all the examples I ... unable to adapt for my purposes. See Question&Answers more detail:os...

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

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