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What's the difference between HEAD^ and HEAD~ in Git?
When I specify an ancestor commit object in Git, I'm confused between HEAD^ and HEAD~ .
15 Answers
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design a stack such that getMinimum( ) should be O(1)
.... Note that this doesn't change the complexity of the space required, e.g. if you've got a stack with O(n) space requirements, this will still be O(n) just with a different constant factor.
Non-constant-space solution
Keep a "duplicate" stack of "minimum of all values lower in the stack". When you...
The preferred way of creating a new element with jQuery
... good practice is prefixing your jQuery variables with $:
Is there any specific reason behind using $ with variable in jQuery
Placing quotes around the "class" property name will make it more compatible with less flexible browsers.
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Storing R.drawable IDs in XML array
...e));
where index is the Drawable index.
defaultValue is a value you give if there is no item at this index
For more information about TypedArray visit this link
http://developer.android.com/reference/android/content/res/TypedArray.html
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unsigned int vs. size_t
..."your compiler might make assumption about it": I would hope the compiler knows the exact range of values that size_t can represent! If it doesn't, who does?
– Marc van Leeuwen
Jun 15 '14 at 5:42
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Android View.getDrawingCache returns null, only null
... null
v.measure(MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED),
MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
v.layout(0, 0, v.getMeasuredWidth(), v.getMeasuredHeight());
v.buildDrawingCache(true);
Bitmap b = Bitmap.createBitmap(v.getDrawingCache());
v.s...
putting datepicker() on dynamically created elements - JQuery/JQueryUI
... I think you'd be OK with the .datapicker() because it will probably check if a datepicker is created before trying to recreate. With other code you might not have this grace. Also, .on( is only introduced in JQuery 1.7 - so make sure you're using the correct version.
– Tr1sta...
Unable to install gem - Failed to build gem native extension - cannot load such file — mkmf (LoadErr
... 12.04
Usually, the solution is:
sudo apt-get install ruby-dev
Or, if that doesn't work, depending on your ruby version, run something like:
sudo apt-get install ruby1.9.1-dev
Should fix your problem.
Still not working? Try the following after installing ruby-dev:
sudo apt-get i...
How do I match any character across multiple lines in a regular expression?
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The s flag is (now?) invalid, at least in Chrome/V8. Instead use /([\s\S]*)<FooBar>/ character class (match space and non-space] instead of the period matcher. See other answers for more info.
– Allen
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What is the size of ActionBar in pixels?
...height of the ActionBar in XML, just use
?android:attr/actionBarSize
or if you're an ActionBarSherlock or AppCompat user, use this
?attr/actionBarSize
If you need this value at runtime, use this
final TypedArray styledAttributes = getContext().getTheme().obtainStyledAttributes(
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