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Check whether or not the current thread is the main thread
...sender=0x00007fd221486340, self=0x00007fd22161c1a0)(ObjectiveC.UISlider) -> () + 112 at ViewController.swift:20, queue = 'com.apple.main-thread', stop reason = breakpoint 2.1
If the value for queue is com.apple.main-thread, then you're on the main thread.
...
Why is Scala's immutable Set not covariant in its type?
...owing signatures should clarify things slightly:
trait Set[A] extends (A=>Boolean) {
def apply(e: A): Boolean
}
If Set were covariant in A, the apply method would be unable to take a parameter of type A due to the contravariance of functions. Set could potentially be contravariant in A, but...
VS2012 return to a normal TFS checkin window?
...l that pops up the old dialog.
You can do this from Visual Studio: TOOLS -> External Tools… -> Add, with the following values:
Title: Checkin (or any name that should be displayed in the menu)
Command: C:\Program Files (x86)\Microsoft Visual Studio 11.0\Common7\IDE\TF.exe (this is the defau...
Why can't static methods be abstract in Java?
... It's not a logical contradiction, it's a language shortcoming, multiple other languages support this notion. "abstract" mean "implemented in subclasses", "static" means "executed on the class rather than class instances" There is no logical contradiction.
– Eric Gr...
Is 23,148,855,308,184,500 a magic number, or sheer chance?
...en why didn’t other amounts cause it, thus affecting everyone, not just <13,000. Still, how is it that 13,000 people could have just happened to charge the exact same amount in the same week?
They say it’s a “temporary programming error”, and it may well be, but could it be a hacking thi...
Why doesn't Console.Writeline, Console.Write work in Visual Studio Express?
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The debug output appears in the Output window (Debug => Windows => Output). Mine wasn't open by default.
– Appulus
Aug 21 '13 at 10:21
1
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How good is Java's UUID.randomUUID?
...subtle bugs ..." - Or (donning tin-foil hat) ... deliberate subtle flaws. <:-)
– Stephen C
Sep 16 '14 at 13:20
25
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Rails migrations: self.up and self.down versus change
...
class AddImageToUsers < ActiveRecord::Migration
def change
add_column :users, :image_file_name, :string
add_column :users, :image_content_type, :string
add_column :users, :image_file_size, :integer
add_column :users, :image_upd...
How to recognize USB devices in Virtualbox running on a Linux host? [closed]
...VM (virtual machine).
Open Virtualbox
Select your VM and go to "Machine" -> "Settings" -> "USB".
Check "Enable USB Controller"; click on the icon with the USB plug and the plus, and
click on the devices you want to be automatically mounted in the VM. Click "Ok".
Click on "Start" toolbar button...
Unable to Connect to GitHub.com For Cloning
... thanks it helped me too. I just updated url line inside .git > config ==> to https ://git@git...xxx
– STEEL
May 29 '14 at 9:21
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