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Do declared properties require a corresponding instance variable?

Do properties in Objective-C 2.0 require a corresponding instance variable to be declared? For example, I'm used to doing something like this: ...
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“Debug only” code that should run only when “turned on”

I would like to add some C# "debug only" code that only runs if the person debugging requests it. In C++, I used to do something similar to the following: ...
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Django: How to completely uninstall a Django app?

...igrate my_app_name zero (see the migrate docs), which runs the database cleaning automatically. To remove the app from your project, all you need to do is remove it from INSTALLED_APPS in your project's settings.py. Django will no longer load the app. If you no longer want the app's files hanging ar...
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AngularJS - Access to child scope

...d. These are objects and they pass by reference. – Swanidhi Sep 30 '15 at 19:51 2 @Swanidhi = I k...
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Ruby: kind_of? vs. instance_of? vs. is_a?

What is the difference? When should I use which? Why are there so many of them? 4 Answers ...
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Purpose of #!/usr/bin/python3

I have noticed this in a couple of scripting languages, but in this example, I am using python. In many tutorials, they would start with #!/usr/bin/python3 on the first line. I don't understand why we have this. ...
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Remove .php extension with .htaccess

...y it tries to fix it itself in most of the cases, but sometimes this mechanism need to be emulated by you. For instance after you have done a lot of complicated URL rewritings to CGI scripts etc. Perhaps you could expand on why you want to remove the trailing slash all the time? Remove .php...
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GCD to perform task in main thread

I have a callback which might come from any thread. When I get this callback, then I would like to perform a certain task on the main thread. ...
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How to see which flags -march=native will activate?

...m l1-cache-line-size=64 --param l2-cache-size=512 – Daniel Santos Jan 29 '15 at 0:22 @DanielSantos: on my system it do...
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In Git, what is the difference between origin/master vs origin master?

...te master branch. Local branch is just the master. – Aniket Thakur Apr 12 '16 at 19:04 add a comment  |  ...