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A semaphore is a programming concept that is frequently used to solve multi-threading problems. My question to the ... a semaphore and how do you use it? Question&Answers:os...

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How do I ignore an error on 'git pull' about my local changes would be overwritten by merge?

How do I ignore the following error message on Git pull? Your local changes to the following files would ... want to overwrite specific changes, not everything. Question&Answers:os...

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r - Increment by 1 for every change in column

Lets say I have the following data frame set.seed(123) df <- data.frame(var1=(runif(10)>0.5)*1) var1 could have any type / number ... 3 b 4 b 4 b 4 c 5 1 6 1 6 Question&Answers:os...

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CSS text-decoration property cannot be overridden by child element

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android - Should we use RecyclerView to replace ListView?

Closed. This question is opinion-based. It is not currently accepting answers. Question&Answers:os...

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objective c - Managing multiple asynchronous NSURLConnection connections

I have a ton of repeating code in my class that looks like the following: NSURLConnection *connection = ... a class that handles multiple asynchronous requests. Question&Answers:os...

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xcode4 - How can we restore ppc/ppc64 as well as full 10.4/10.5 SDK support to Xcode 4?

Since Apple only ships SDK 10.6 with Xcode4, developing PPC applications with Xcode4 became impossible. While ... Can we restore this functionality to Xcode4? Question&Answers:os...

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Excel VBA deleting rows in a for loop misses rows

I have a subroutine that deletes rows in a range containing around 1000 rows. Rows are deleted on a critera. The ... there anyone who know a sloution to this? Question&Answers:os...

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windows - Python ctypes cdll.LoadLibrary, instantiate an object, execute its method, private variable address truncated

I wrote a dll library in c, compile with vs2017 64-bit, and try to load it with python3.6 64-bit. However ... to python, or passing the object back to dll. Question&Answers:os...

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Signed versus Unsigned Integers

Am I correct to say the difference between a signed and unsigned integer is: Unsigned can hold a ... positive and negative numbers. Any other differences? Question&Answers:os...

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ios - Changing Tint / Background color of UITabBar

The UINavigationBar and UISearchBar both have a tintColor property that allows you to change the tint color (surprising ... the default black color. Any ideas? Question&Answers:os...

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java - Why does the first panel added to a frame disappear?

Below is an example of adding two panels to a frame. Only one panel (the 2nd, red panel) appears ... ::new; SwingUtilities.invokeLater(r); } } Question&Answers:os...

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python - How do I create animated sprites using Sprite Sheets in Pygame?

So I've been testing out this code, I found a tutorial on how I can add spritesheets in pygame and decided to ... load up and I can't move the pygame screen. Question&Answers:os...

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operators - Python != operation vs "is not"

In a comment on this question, I saw a statement that recommended using result is not None vs result != None ... why one might be recommended over the other? Question&Answers:os...

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JavaScript string encryption and decryption?

I'm interested in building a small app for personal use that will encrypt and decrypt information on the client side ... / Any other libraries I should look at? Question&Answers:os...

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c# - Is there a reason Image.FromFile throws an OutOfMemoryException for an invalid image format?

I am writing code that catches this OutOfMemoryException and throws a new, more intuitive exception: /// ... intentionally being thrown for a particular reason? Question&Answers:os...

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java - Why shouldn't I call setVisible(true) before adding components?

I've seen it written on this site a number of times (such as here, and here) that you mustn't call setVisible ... case, and what happens if you break the rule? Question&Answers:os...

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php - Simple Postgresql Statement - column name does not exists

I've been pulling my hair out. I have a very simple postgre database, one specific table has a column named lName ( ... Why is it saying the column is "Smith"? Question&Answers:os...

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c++ - Dealing with accuracy problems in floating-point numbers

I was wondering if there is a way of overcoming an accuracy problem that seems to be the result of my machine' ... result of 2.0. Any suggestions most welcome. Question&Answers:os...

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parsing - lexers vs parsers

Are lexers and parsers really that different in theory? It seems fashionable to hate regular expressions: coding ... with bison or antlr parser generators? Question&Answers:os...

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ios - The model used to open the store is incompatible with the one used to create the store

I created a Core Data model in xcode 3.2 and after upgrading in Xcode 4.2, I then added a new entity of ... anyone know a solution for this issue? Please help. Question&Answers:os...

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angularjs - What is the best practice for making an AJAX call in Angular.js?

I was reading this article: http://eviltrout.com/2013/06/15/ember-vs-angular.html And it said, Due to it ... best practice for making $http calls then? and why? Question&Answers:os...

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tsql - List of all index & index columns in SQL Server DB

How do I get a list of all index & index columns in SQL Server 2005+? The closest I could get is: ... in index definition) plus as much metadata as possible. Question&Answers:os...

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c - Why sizeof(param_array) is the size of pointer?

I want to get the length of an array, say int array[] = {1, 2, 3, 4}. I used sizeof to do that. ... I modify the length function to get an array's length? Question&Answers:os...

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rust - Can I do type introspection with trait objects and then downcast it?

I have a collection of Trait, a function that iterates over it and does something, and then I would like to check the ... as Foo; // f.foo_method(); //} } Question&Answers:os...

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c# - Token Based Authentication in ASP.NET Core

I'm working with ASP.NET Core application. I'm trying to implement Token Based Authentication but can ... application to work with token based authentication? Question&Answers:os...

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java - Get Edited TreeNode from a CellEditorListener

Earlier I asked how to fire an event when a TreeNode was renamed (here). My question was answered, but I ran into ... be found here (It's an Eclipse archive). Question&Answers:os...

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python - How to delete the contents of a folder?

How can I delete the contents of a local folder in Python? The current project is for Windows, but I would like to see *nix also. Question&Answers:os...

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

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