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What is the difference between a weak reference and an unowned reference?
...a.k.a. they don't increase the retain count in order to prevent ARC from deallocating the referred object).
But why two keywords? This distinction has to do with the fact that Optional types are built-in the Swift language. Long story short about them: optional types offer memory safety (this works ...
What's the best practice to “git clone” into an existing folder?
...hanks! Though this is missing a step like "git checkout -- ." as it thinks all the files are deleted, right?
– mrooney
Dec 15 '12 at 19:39
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Rails and PostgreSQL: Role postgres does not exist
I have installed PostgreSQL on my Mac OS Lion, and am working on a rails app. I use RVM to keep everything separate from my other Rails apps.
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Cleanest way to build an SQL string in Java
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First of all consider using query parameters in prepared statements:
PreparedStatement stm = c.prepareStatement("UPDATE user_table SET name=? WHERE id=?");
stm.setString(1, "the name");
stm.setInt(2, 345);
stm.executeUpdate();
The ...
How to set the context path of a web application in Tomcat 7.0
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What you can do is the following;
Add a file called ROOT.xml in <catalina_home>/conf/Catalina/localhost/
This ROOT.xml will override the default settings for the root context of the tomcat installation for that engine and host (Catalina and localhost).
Enter the ...
How to select between brackets (or quotes or …) in Vim?
...or this kinda stuff, but now that I need it, I can't seem to find it (naturally), so I'll just ask nice and simple.
9 Answe...
Found conflicts between different versions of the same dependent assembly that could not be resolved
...s say this, they don't make it explicit, so I will....
On VS2013.2, to actually trigger the emission of the cited information, you need to not read the message, which says:
C:\Program Files (x86)\MSBuild\12.0\bin\Microsoft.Common.CurrentVersion.targets(1697,5): warning MSB3277: Found conflicts betw...
How to increase the maximum number of opened editors in IntelliJ?
... files limit if you are using the Recent Files (Cmd+E) feature.
Works for all IntelliJ IDEA platform based IDEs.
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Android - How To Override the “Back” button so it doesn't Finish() my Activity?
...ACK.
You just need the following to catch the back key (Make sure not to call super in onBackPressed()).
Also, if you plan on having a service run in the background, make sure to look at startForeground() and make sure to have an ongoing notification or else Android will kill your service if it ne...
Why do x86-64 instructions on 32-bit registers zero the upper part of the full 64-bit register?
...he CPU would have to wait on. The register renaming mechanism would essentially be defeated if it wasn't done that way.
This way you can write fast code using 32-bit values in 64-bit mode without having to explicitly break dependencies all the time. Without this behaviour, every single 32-bit instr...