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Bash if statement with multiple conditions throws an error
...e contributors from MySQL that checks whether the specified variables were set.
As the script shows, you can pipe them with -a, e.g.:
if [ -z "$MYSQL_ROOT_PASSWORD" -a -z "$MYSQL_ALLOW_EMPTY_PASSWORD" -a -z "$MYSQL_RANDOM_ROOT_PASSWORD" ]; then
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fi
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a href link for entire div in HTML/CSS
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You should just set the display:block on the <a> tag. It will become a block element without nesting.
– Augie Gardner
Aug 11 '13 at 6:08
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Switching to a TabBar tab view programmatically?
....tabBarController.selectedIndex = 1
Objective-C
[self.tabBarController setSelectedIndex:1];
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Combine two data frames by rows (rbind) when they have different sets of columns
Is it possible to row bind two data frames that don't have the same set of columns? I am hoping to retain the columns that do not match after the bind.
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Yes/No message box using QMessageBox
...ons you can use; the function returns the button that was clicked. You can set a default button with an extra argument (Qt "chooses a suitable default automatically" if you don't or specify QMessageBox::NoButton).
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Is it possible to read from a InputStream with a timeout?
...ufferedReader br = new BufferedReader(new InputStreamReader(System.in, Charset.forName("ISO-8859-1")),1024);
// ...
// inside some iteration / processing logic:
if (br.ready()) {
int readCount = br.read(inputData, bufferOffset, inputData.length-bufferOffset);
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Is a Python dictionary an example of a hash table?
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So collisions are unavoidable. Set S may contain an infinitely large number of items, and you want it to hash to a number a computer can store. Every usable implementation of a hash table resolves collisions, with two of the most frequent methods being a) ...
Creating a UICollectionView programmatically
I'm looking for a guide or tutorial that will show me how to set up a simple UICollectionView using only code.
12 Answers
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setNeedsLayout vs. setNeedsUpdateConstraints and layoutIfNeeded vs updateConstraintsIfNeeded
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Your conclusions are right. The basic scheme is:
setNeedsUpdateConstraints makes sure a future call to updateConstraintsIfNeeded calls updateConstraints.
setNeedsLayout makes sure a future call to layoutIfNeeded calls layoutSubviews.
When layoutSubviews is called, it also...
git pushes with wrong user from terminal
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Make sure you delete all github entry here & set the login configuration *git config --global user.name <name> *git config --global user.email <email>
– Shank_Transformer
Mar 9 '15 at 8:07
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