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Cleanest way to toggle a boolean variable in Java?
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The "obvious" way (for most people)
theBoolean = !theBoolean;
The "shortest" way (most of the time)
theBoolean ^= true;
The "most visual" way (most uncertainly)
theBoolean = theBoolean ? false : true;
Extra: Toggle and use in a method call
theMethod( theBoolean ^= true );
Since the assi...
Display help message with python argparse when script is called without any arguments
...rint the help message whenever the error
method is triggered. For example, test.py --blah will print the help message
too if --blah isn't a valid option.
If you want to print the help message only if no arguments are supplied on the
command line, then perhaps this is still the easiest way:
import ...
Undefined reference to vtable
...rement like that)
virtual void functionB(parameters) =0;
(This works it is Tested)
Provide Definition for functionB in Class A itself keeping it as virtual .
(Hope it works as I didn't try this)
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Replace all elements of Python NumPy Array that are greater than some value
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I think both the fastest and most concise way to do this is to use NumPy's built-in Fancy indexing. If you have an ndarray named arr, you can replace all elements >255 with a value x as follows:
arr[arr > 255] = x
I ran this on my machi...
AngularJs: Reload page
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window object is made available through $window service for easier testing and mocking, you can go with something like:
$scope.reloadPage = function(){$window.location.reload();}
And :
<a ng-click="reloadPage" class="navbar-brand" title="home" data-translate>PORTAL_NAME</a>...
How can I delete multiple lines in vi?
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Commands listed for use in normal mode (prefix with : for command mode).
Tested in Vim.
By line amount:
numdd - will delete num lines DOWN starting count from current cursor position (e.g. 5dd will delete current line and 4 lines under it => deletes current line and (num-1) lines under it)
n...
Disable scrolling on ``
...roll class it wont change on scroll, otherwise everything stays the same.
Test here with JSFiddle
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Changing the child element's CSS when the parent is hovered
...h div border in a different color while the rest stays on white.
You can test it at: http://jsbin.com/ubiyo3/13
And here is the code:
<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
<title>Hierarchie Borders MarkUp</title>
<style>
.parent { displ...
What is the difference between HAVING and WHERE in SQL?
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This is more useful than it sounds. For example, consider this query to test whether the name column is unique for all values in T:
SELECT 1 AS result
FROM T
HAVING COUNT( DISTINCT name ) = COUNT( name );
There are only two possible results: if the HAVING clause is true then the result with ...
How can I get the console logs from the iOS Simulator?
I want to see what happens in the iOS Simulator if I'm not testing the app in Xcode.
12 Answers
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