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Understanding dispatch_async
...ount).
The level of concurrency is handled entirely by the system and is based on system load and other internally determined factors. This is the beauty of Grand Central Dispatch (the dispatch_async() system) - you just make your work units as code blocks, set a priority for them (based on the qu...
Rename a class in Xcode: Refactor… is grayed out (disabled). Why?
...ctor was disabled because the Xcode project I had opened was referencing a Base SDK that was missing. Edit Project Settings and in the Build tab set the Base SDK to one that you have (like for me this was iOS 4.2). This enabled Refactor for me.
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How to check if type of a variable is string?
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In Python 2.x, you would do
isinstance(s, basestring)
basestring is the abstract superclass of str and unicode. It can be used to test whether an object is an instance of str or unicode.
In Python 3.x, the correct test is
isinstance(s, str)
The bytes class is...
What are the undocumented features and limitations of the Windows FINDSTR command?
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Preface
Much of the information in this answer has been gathered based on experiments run on a Vista machine. Unless explicitly stated otherwise, I have not confirmed whether the information applies to other Windows versions.
FINDSTR output
The documentation never bothers to explain the ou...
Delete duplicate records in SQL Server?
...d EmployeeName table Employee . The goal is to delete repeated records, based on the EmployeeName field.
10 Answers
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mysqldump - Export structure only without autoincrement
I have a MySQL database and I am trying to find a way to export its structure only, without the auto increment values. mysqldump --no-data would almost do the job, but it keeps the auto_increment values. Is there any way to do it without using PHPMyAdmin (that I know it can do it)?
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How to move files from one git repo to another (not a clone), preserving history
...ctory 1. The result is the contents of directory 1 spewed out
into to the base of repository A.
git filter-branch --subdirectory-filter <directory> -- --all
# eg. git filter-branch --subdirectory-filter subfolder1/subfolder2/FOLDER_TO_KEEP -- --all
For single file move only: go through what...
Map Tiling Algorithm
I'm making a tile based RPG with Javascript, using perlin noise heightmaps, then assigning a tile type based on the height of the noise.
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How are 3D games so efficient? [closed]
...ail as much as you can -- low/medium/high versions of 3D models and switch based on distance from camera player - no point rendering a high-res version if it's only 5 pixels on screen.
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Apache and Node.js on the Same Server
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Where do I add this on debian based distributions? There's no httpd.conf file.
– santi
Jul 27 '15 at 12:11
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