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Type erasure techniques
...t said, there's one technique I particularly like, though: It's shared_ptr<void>, simply because it blows the minds off of people who don't know you can do this: You can store any data in a shared_ptr<void>, and still have the correct destructor called at the end, because the shared_ptr ...
What is C# analog of C++ std::pair?
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Tuples are available since .NET4.0 and support generics:
Tuple<string, int> t = new Tuple<string, int>("Hello", 4);
In previous versions you can use System.Collections.Generic.KeyValuePair<K, V> or a solution like the following:
public class Pair<T, U> {
...
AngularJS ng-repeat handle empty list case
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You can use ngShow.
<li ng-show="!events.length">No events</li>
See example.
Or you can use ngHide
<li ng-hide="events.length">No events</li>
See example.
For object you can test Object.keys.
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How to use the “required” attribute with a “radio” input field
...ne to be selected at a time and applies required to the whole group.
<form>
Select Gender:<br>
<label>
<input type="radio" name="gender" value="male" required>
Male
</label><br>
<label>
<input type="radio" name="gender"...
How can I find out the current route in Rails?
I need to know the current route in a filter in Rails. How can I find out what it is?
13 Answers
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How to initialize HashSet values by construction?
...hat I use that is not very time efficient, but fits on a single line:
Set<String> h = new HashSet<>(Arrays.asList("a", "b"));
Again, this is not time efficient since you are constructing an array, converting to a list and using that list to create a set.
When initializing static fina...
sudo echo “something” >> /etc/privilegedFile doesn't work
...note: NEVER forget the -a! Just imagine what a echo 'tmpfs /tmp tmpfs defaults 0 0' | sudo tee /etc/fstab would do
– mic_e
Feb 17 '13 at 8:00
21
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Is it possible to data-bind visible to the negation (“!”) of a boolean ViewModel property?
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I agree with John Papa's comment that there should be a built-in hidden binding. There are two benefits to a dedicated hidden binding:
Simpler syntax, ie. hidden: charted instead of visible: !charted().
Less resources, since Knockout can observe the observable charted directly, rat...
ERROR: permission denied for sequence cities_id_seq using Postgres
...at postgres (and at database info systems all in all). I ran following sql script on my database:
4 Answers
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Differences between action and actionListener
...on get executed, e.g. to log it, and/or to set an additional property (by <f:setPropertyActionListener>), and/or to have access to the component which invoked the action (which is available by ActionEvent argument). So, purely for preparing purposes before the real business action gets invoked...